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WO1992009363A1 - Granular absorbents - Google Patents

Granular absorbents Download PDF

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Publication number
WO1992009363A1
WO1992009363A1 PCT/CA1991/000429 CA9100429W WO9209363A1 WO 1992009363 A1 WO1992009363 A1 WO 1992009363A1 CA 9100429 W CA9100429 W CA 9100429W WO 9209363 A1 WO9209363 A1 WO 9209363A1
Authority
WO
WIPO (PCT)
Prior art keywords
particles
paper
sodium silicate
calcium chloride
permeable
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CA1991/000429
Other languages
French (fr)
Inventor
Ragui Ghali
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
UTHANE RESEARCH Ltd
Original Assignee
UTHANE RESEARCH Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by UTHANE RESEARCH Ltd filed Critical UTHANE RESEARCH Ltd
Publication of WO1992009363A1 publication Critical patent/WO1992009363A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/68—Treatment of water, waste water, or sewage by addition of specified substances, e.g. trace elements, for ameliorating potable water
    • C02F1/681—Treatment of water, waste water, or sewage by addition of specified substances, e.g. trace elements, for ameliorating potable water by addition of solid materials for removing an oily layer on water
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
    • B01J20/04—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of alkali metals, alkaline earth metals or magnesium
    • B01J20/046—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of alkali metals, alkaline earth metals or magnesium containing halogens, e.g. halides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
    • B01J20/10—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/22—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising organic material
    • B01J20/24—Naturally occurring macromolecular compounds, e.g. humic acids or their derivatives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
    • B01J20/28002—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their physical properties
    • B01J20/28004—Sorbent size or size distribution, e.g. particle size
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/30—Processes for preparing, regenerating, or reactivating
    • B01J20/3078—Thermal treatment, e.g. calcining or pyrolizing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/30—Processes for preparing, regenerating, or reactivating
    • B01J20/32—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating
    • B01J20/3202—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating characterised by the carrier, support or substrate used for impregnation or coating
    • B01J20/3206—Organic carriers, supports or substrates
    • B01J20/3208—Polymeric carriers, supports or substrates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/30—Processes for preparing, regenerating, or reactivating
    • B01J20/32—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating
    • B01J20/3231—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating characterised by the coating or impregnating layer
    • B01J20/3234—Inorganic material layers
    • B01J20/3236—Inorganic material layers containing metal, other than zeolites, e.g. oxides, hydroxides, sulphides or salts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/30—Processes for preparing, regenerating, or reactivating
    • B01J20/32—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating
    • B01J20/3231—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating characterised by the coating or impregnating layer
    • B01J20/3289—Coatings involving more than one layer of same or different nature
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K3/00—Materials not provided for elsewhere
    • C09K3/32—Materials not provided for elsewhere for absorbing liquids to remove pollution, e.g. oil, gasoline, fat

Definitions

  • This invention relates to absorbent compositions and granular absorbent products and, more particularly, relates to a method for producing absorbents in the form of porous and permeable granules for liquids such as oils and solvents.
  • Waste paper presents a substantial disposal problem because of vast quantities produced daily.
  • the present invention provides surprising utility for waste paper which can be converted to a product which is granular, friable, insoluble in water and highly absorbent of oils, solvents, cutting oils and like.
  • the product can be used, for example, in clean-up of shops, and for oil spills and gasoline spills on water.
  • waste paper such as telephone books or the like wood cellulose material shredded to a predetermined particle size is uniformly sprayed with or otherwise wetted such as by immersion with sodium silicate and with calcium chloride dissolved in water, and then rapidly dried by quick heating to a predetermined elevated temperature whereby trapped moisture is suddenly converted to steam to foam the silicate into porous and permeable light-weight friable granules.
  • the method of the invention for producing a porous and permeable granular absorbent comprises the steps of uniformly applying an effective amount of aqueous sodium silicate to cellulose particles to saturate the said particles, then applying to said paper particles an effective amount of aqueous solution of calcium chloride, and rapidly drying the wetted particles by quickly heating said particles to a temperature in the range of about 730° to 920°C whereby moisture is converted to steam to foam the silicate and to form porous and permeable granules.
  • the method of the invention comprises the steps of shredding paper into paper particles in the size range of about 3 mm to 10 mm, uniformly applying aqueous sodium silicate to said paper particles, uniformly applying to said paper particles an aqueous solution of calcium chloride, and then rapidly drying the said wetted paper particles by quickly heating said wetted paper particles to a temperature in the range of about 730° to 920"C whereby trapped moisture is converted to steam to foam or intumesce the silicate composition into porous and permeable granules.
  • the paper preferably is shredded to particles in the size of about 6 mm, the aqueous solutions applied by spraying, and the paper particles preferably are quickly heated to a temperature of about 850 * C within about 10 to 15 minutes.
  • the aqueous solutions may be applied by uniform spraying onto the shredded paper sprayed while tumbled in a ribbon mixer, it being important that the calcium chloride, which can be substituted in part by magnesium silico fluoride, sodium fluoride or zinc silico fluoride dissolved in water, are uniformly applied over the tumbling paper after the sodium silicate has been applied.
  • the cellulose material may be obtained from waste paper such as old telephone books or newsprint and is shredded or otherwise particulated to a size in the range of about 3 mm to 10 mm, preferably about 6 mm.
  • the shredded paper is fed continuously to a mixer- conveyor such as a ribbon mixer and aqueous sodium silicate containing, for example, about 30-47% by weight sodium silicate in water is uniformly applied to the shredded paper such as by spraying while it is tumbled during passage through the mixer.
  • aqueous sodium silicate sold by National Silicates Limited under the trade-mark "N” or "RU” has been found suitable.
  • Calcium chloride or preferably a solution of calcium chloride in water is then uniformly applied such as by spraying onto the tumbling shredded paper to which the sodium silicate has been applied. It has been found that a solution of magnesio silico fluoride, sodium silico fluoride or zinc silico fluoride in water may be substituted in part for the aqueous calcium chloride solution.
  • the wet shredded paper is rapidly heated within about 10-15 minutes to a temperature in the range of 730° to 920°C, preferably to about 850°C, to vaporize the water content of the aqueous sodium silicate and calcium chloride and to intumesce the sodium silicate into a porous and permeable structure.
  • the intumesced structure is maintained at an elevated temperature for a total of about 35 minutes to ensure all moisture is vaporized and removed.
  • Granular composition of the present invention can be produced by spraying cellulose, such as derived from particulated paper, in the quantities or parts as follows:
  • the granular product has a density within the range of 0.21 to 0.48 gm per cc and floats readily on water to function as an effective collector and absorbent of hydrocarbons in oil or gas spills.
  • the product does not lose its crunchy or friable characteristics when wetted by water.
  • Example 1 95g of waste paper shredded to particles about 6 mm in size were uniformly sprayed with 14Og of a sodium silicate solution containing 37% by weight sodium silicate solids in water and then uniformly sprayed while wet with 9 g of a saturated solution of calcium chloride in water, for a total of 100 g of water, while tumbled during passage through a ribbon mixer.
  • the wet paper particles were heated rapidly within about 10 minutes to 855°C for vaporization of the moisture as steam and foaming of the silicate.
  • the resulting granules were porous, permeable, friable, crunchy, had a density of 0.23 gm per cc and absorbed 0.72 gm of crankcase oil or 0.9 gm of water per cc.
  • Example 2 0.45 kg of shredded paper averaging 6 mm in size were uniformly sprayed with 8.9 kg of a sodium silicate solution containing 37% by weight sodium silicate solids in water and then uniformly sprayed while wet with 2.2 kg of a saturated solution of 50% by weight calcium chloride in. water, for a total of 2.23 kg of water, while tumbling during passage through a ribbon mixer.
  • the wet paper particles were heated rapidly in about 10 minutes to 850°C for vaporization of the moisture as steam and maintained at the elevated temperature for a total of 35 minutes to ensure evaporation of all the moisture.
  • the resulting granules were porous, permeable, crunchy and friable, had a density of 0.21 to 0.48 g s per cc, and were effective as an absorbent of hydrocarbons or water.
  • Waste paper which normally must be disposed of in waste dumps to occupy valuable space can be converted to a light-weight granular liquid absorbent which is highly porous and permeable, water insoluble, fire resistant, crunchy and friable.
  • the crunchy and friable nature of the granules allows the granules to fracture and break down into dust which can enter crevices and the like small openings to absorb oil otherwise difficult to remove by conventional absorbents such as saw dust.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Analytical Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Hydrology & Water Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Water Supply & Treatment (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Public Health (AREA)
  • Materials Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Processing Of Solid Wastes (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)

Abstract

Waste paper or the like wood cellulose material is shredded if necessary into particles in the size range of about 3 mm to 10 mm, aqueous sodium silicate is applied to said particles, an aqueous solution of calcium chloride is then applied to the particles, and the wetted particles rapidly dried by quickly heating said wetted paper particles to a temperature in the range of about 730° to 920 °C whereby trapped moisture is converted to steam to foam or intumesce the silicate composition into porous and permeable granules. The paper preferably is shredded to particles in the size of about 6 mm, the aqueous solutions applied by spraying, and the paper particles preferably are quickly heated to a temperature of about 850 °C within about 10 to 15 minutes.

Description

GRANULAR ABSORBENTS BACKGROUND OF THE INVENTION
This invention relates to absorbent compositions and granular absorbent products and, more particularly, relates to a method for producing absorbents in the form of porous and permeable granules for liquids such as oils and solvents.
Waste paper presents a substantial disposal problem because of vast quantities produced daily. The present invention provides surprising utility for waste paper which can be converted to a product which is granular, friable, insoluble in water and highly absorbent of oils, solvents, cutting oils and like. The product can be used, for example, in clean-up of shops, and for oil spills and gasoline spills on water.
It is accordingly a principal object of the present invention to provide a method for producing porous and permeable friable absorbent granules from waste paper or the like wood cellulose materials. It is another object of the invention to produce a novel porous and permeable fire-resistant granular absorbent for liquids such as liquid hydrocarbons. SUMMARY OF THE INVENTION
In accordance with the present invention, waste paper such as telephone books or the like wood cellulose material shredded to a predetermined particle size is uniformly sprayed with or otherwise wetted such as by immersion with sodium silicate and with calcium chloride dissolved in water, and then rapidly dried by quick heating to a predetermined elevated temperature whereby trapped moisture is suddenly converted to steam to foam the silicate into porous and permeable light-weight friable granules.
In its broad aspect, the method of the invention for producing a porous and permeable granular absorbent comprises the steps of uniformly applying an effective amount of aqueous sodium silicate to cellulose particles to saturate the said particles, then applying to said paper particles an effective amount of aqueous solution of calcium chloride, and rapidly drying the wetted particles by quickly heating said particles to a temperature in the range of about 730° to 920°C whereby moisture is converted to steam to foam the silicate and to form porous and permeable granules.
More particularly, the method of the invention comprises the steps of shredding paper into paper particles in the size range of about 3 mm to 10 mm, uniformly applying aqueous sodium silicate to said paper particles, uniformly applying to said paper particles an aqueous solution of calcium chloride, and then rapidly drying the said wetted paper particles by quickly heating said wetted paper particles to a temperature in the range of about 730° to 920"C whereby trapped moisture is converted to steam to foam or intumesce the silicate composition into porous and permeable granules. The paper preferably is shredded to particles in the size of about 6 mm, the aqueous solutions applied by spraying, and the paper particles preferably are quickly heated to a temperature of about 850*C within about 10 to 15 minutes.
The aqueous solutions may be applied by uniform spraying onto the shredded paper sprayed while tumbled in a ribbon mixer, it being important that the calcium chloride, which can be substituted in part by magnesium silico fluoride, sodium fluoride or zinc silico fluoride dissolved in water, are uniformly applied over the tumbling paper after the sodium silicate has been applied.
DESCRIPTION OF THE PREFERRED EMBODIMENT
The cellulose material may be obtained from waste paper such as old telephone books or newsprint and is shredded or otherwise particulated to a size in the range of about 3 mm to 10 mm, preferably about 6 mm.
The shredded paper is fed continuously to a mixer- conveyor such as a ribbon mixer and aqueous sodium silicate containing, for example, about 30-47% by weight sodium silicate in water is uniformly applied to the shredded paper such as by spraying while it is tumbled during passage through the mixer. Aqueous sodium silicate sold by National Silicates Limited under the trade-mark "N" or "RU" has been found suitable.
Calcium chloride or preferably a solution of calcium chloride in water, such as a saturated solution containing 50% by weight calcium chloride and 50% water, is then uniformly applied such as by spraying onto the tumbling shredded paper to which the sodium silicate has been applied. It has been found that a solution of magnesio silico fluoride, sodium silico fluoride or zinc silico fluoride in water may be substituted in part for the aqueous calcium chloride solution.
The wet shredded paper is rapidly heated within about 10-15 minutes to a temperature in the range of 730° to 920°C, preferably to about 850°C, to vaporize the water content of the aqueous sodium silicate and calcium chloride and to intumesce the sodium silicate into a porous and permeable structure. The intumesced structure is maintained at an elevated temperature for a total of about 35 minutes to ensure all moisture is vaporized and removed.
Although it will be understood that I am not bound by hypothetical considerations, it is believed that the intumescence of the silicate by vaporization of the moisture pulls apart the cellulose from the paper into a porous and permeable cellular structure. The calcium chloride or equivalent is believed to render the sodium silicate water insoluble by replacement of the Na+ ion with the Ca++ ion. Granular composition of the present invention can be produced by spraying cellulose, such as derived from particulated paper, in the quantities or parts as follows:
Range (wt - grams)
Cellulose (shredded paper) 100
Calcium chloride 6-16
Magnesium silico fluoride 0-11 or equivalent
Sodium silicate (30-47% solid) 45-70
Water 100-150
The granular product has a density within the range of 0.21 to 0.48 gm per cc and floats readily on water to function as an effective collector and absorbent of hydrocarbons in oil or gas spills. The product does not lose its crunchy or friable characteristics when wetted by water.
The process of the invention will now be described with reference to the following non-limitative examples.
Example 1 95g of waste paper shredded to particles about 6 mm in size were uniformly sprayed with 14Og of a sodium silicate solution containing 37% by weight sodium silicate solids in water and then uniformly sprayed while wet with 9 g of a saturated solution of calcium chloride in water, for a total of 100 g of water, while tumbled during passage through a ribbon mixer. The wet paper particles were heated rapidly within about 10 minutes to 855°C for vaporization of the moisture as steam and foaming of the silicate. The resulting granules were porous, permeable, friable, crunchy, had a density of 0.23 gm per cc and absorbed 0.72 gm of crankcase oil or 0.9 gm of water per cc.
Example 2 0.45 kg of shredded paper averaging 6 mm in size were uniformly sprayed with 8.9 kg of a sodium silicate solution containing 37% by weight sodium silicate solids in water and then uniformly sprayed while wet with 2.2 kg of a saturated solution of 50% by weight calcium chloride in. water, for a total of 2.23 kg of water, while tumbling during passage through a ribbon mixer. The wet paper particles were heated rapidly in about 10 minutes to 850°C for vaporization of the moisture as steam and maintained at the elevated temperature for a total of 35 minutes to ensure evaporation of all the moisture. The resulting granules were porous, permeable, crunchy and friable, had a density of 0.21 to 0.48 g s per cc, and were effective as an absorbent of hydrocarbons or water. The present invention provides a number of important advantages. Waste paper which normally must be disposed of in waste dumps to occupy valuable space can be converted to a light-weight granular liquid absorbent which is highly porous and permeable, water insoluble, fire resistant, crunchy and friable. The crunchy and friable nature of the granules allows the granules to fracture and break down into dust which can enter crevices and the like small openings to absorb oil otherwise difficult to remove by conventional absorbents such as saw dust. It will be understood, of course, that modifications can be made in the embodiment of the invention illustrated and described herein without departing from the scope and purview of the invention as defined by the appended claims.

Claims

CLAIMS :
1. A method of producing a porous and permeable granular absorbent comprising the steps of uniformly applying an effective amount of aqueous sodium silicate to cellulose particles to saturate the said particles, then applying to said paper particles an effective amount of aqueous solution of calcium chloride, and rapidly drying the wetted particles by quickly heating said particles to a temperature in the range of about 730° to 920°C whereby moisture is converted to steam to foam the silicate and to form porous and permeable granules.
2. A method of producing a porous and permeable granular absorbent comprising the steps of shredding paper into paper particles in the size range of about 3 mm to 10 mm, uniformly applying an effective amount of aqueous sodium silicate to said paper particles to saturate the paper particles, then applying to said paper particles an effective amount of aqueous solution of calcium chloride, and rapidly drying the wetted paper particles by quickly heating said paper particles to a temperature in the range of about 730° to 920°C whereby moisture is converted to steam to foam the sodium silicate and to form porous and permeable granules.
3. A method as claimed in c*-aim 1 or 2 in which the aqueous sodium silicate and calcium chloride are applied by spraying.
4. A method as claimed in claim 2 in which the paper is shredded to particles in the size of about 6 mm.
5. A method as claimed in claim 2 to 4 in which the wetted paper particles are quickly heated to a temperature of about 850°C within about 10-15 minutes.
6. A method as claimed in claim 2 to 5 in which the paper particles are sprayed with an effective amount of one of a silico fluoride selected from the group consisting of magnesio silico fluoride, sodium silico fluoride and zinc silico fluoride.
7. A method as claimed in the preceding claims in which the sodium silicate, the calcium chloride and the water are applied to the cellulose in the amounts by weight of 45-70 parts sodium silicate, 6-16 parts calcium chloride, and 100-150 parts water per 100 parts of cellulose.
8. A method as claimed in claim 7 which additionally comprises the addition of 0-11 parts magnesium silico fluoride, sodium silico fluoride or zinc silico fluoride per 100 parts of cellulose.
9. A porous and permeable, friable granular absorbent for liquids comprising wood cellulose particles having a particle size in the range of 3 mm to 6 mm, each said particle characterized by having intumesced therewith an effective amount of sodium silicate and an effective amount of calcium chloride and having a density in the range of 0.21 to 0.48 gm per cc.
10. Porous and permeable, friable granules produced by the method of claims 1-8.
PCT/CA1991/000429 1990-12-03 1991-12-03 Granular absorbents Ceased WO1992009363A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9026244A GB9026244D0 (en) 1990-12-03 1990-12-03 Granular liquid absorbents
GB9026244.5 1990-12-03

Publications (1)

Publication Number Publication Date
WO1992009363A1 true WO1992009363A1 (en) 1992-06-11

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Country Link
CN (1) CN1068754A (en)
AU (1) AU9015191A (en)
GB (1) GB9026244D0 (en)
WO (1) WO1992009363A1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0740990A3 (en) * 1995-05-02 1997-05-28 Schweitzer Jacob Process for defining the various properties of cellulose containing foams
AU732566B2 (en) * 1996-07-25 2001-04-26 Notwheat Pty Ltd Method of treatment of fluid material
GB2328443B (en) * 1997-08-21 2001-09-05 Reckitt & Colmann Prod Ltd In situ formation of pharmaceutically acceptable polymeric material
CN104437385A (en) * 2014-11-13 2015-03-25 蚌埠德美过滤技术有限公司 Expanded graphite added activated carbon filter material and preparation method thereof
CN104437404A (en) * 2014-11-13 2015-03-25 蚌埠德美过滤技术有限公司 Low-cost activated carbon air filter material added with lotus seed pot and shaddock peel and preparation method of air filter material

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JP4189479B2 (en) * 2004-08-26 2008-12-03 有限会社ミューラー Dehydration aid and method for producing the same
NL2004463C2 (en) * 2010-03-26 2011-09-27 Cdem Holland Bv Installation and method for conversion of paper residue into a mineral product.
CN102068964B (en) * 2010-11-23 2013-04-03 沈阳化工大学 Newspaper pulp solid adsorbent and preparation method thereof
CN102151553B (en) * 2011-03-28 2012-11-14 沈阳化工大学 Method for treating printing and dyeing waste water by taking waste newspaper as adsorbent

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1254591B (en) * 1965-04-08 1967-11-23 Wasagchemie Ag Granular silicate for sucking up liquids
US3843306A (en) * 1971-02-09 1974-10-22 Gaf Corp Oil absorbent foamed silicate for oil pollution control
US4151078A (en) * 1976-10-07 1979-04-24 The Dow Chemical Company Removing oil from water
CA1126242A (en) * 1979-04-12 1982-06-22 Maurice Keogh Petroleum products absorbing cellulose fibre material
FR2570621A1 (en) * 1984-09-25 1986-03-28 Biez Georges Process for obtaining composite materials from celluloses and/or starches, the said composite materials and their use, in particular as absorbent products

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1254591B (en) * 1965-04-08 1967-11-23 Wasagchemie Ag Granular silicate for sucking up liquids
US3843306A (en) * 1971-02-09 1974-10-22 Gaf Corp Oil absorbent foamed silicate for oil pollution control
US4151078A (en) * 1976-10-07 1979-04-24 The Dow Chemical Company Removing oil from water
CA1126242A (en) * 1979-04-12 1982-06-22 Maurice Keogh Petroleum products absorbing cellulose fibre material
FR2570621A1 (en) * 1984-09-25 1986-03-28 Biez Georges Process for obtaining composite materials from celluloses and/or starches, the said composite materials and their use, in particular as absorbent products

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0740990A3 (en) * 1995-05-02 1997-05-28 Schweitzer Jacob Process for defining the various properties of cellulose containing foams
AU732566B2 (en) * 1996-07-25 2001-04-26 Notwheat Pty Ltd Method of treatment of fluid material
GB2328443B (en) * 1997-08-21 2001-09-05 Reckitt & Colmann Prod Ltd In situ formation of pharmaceutically acceptable polymeric material
CN104437385A (en) * 2014-11-13 2015-03-25 蚌埠德美过滤技术有限公司 Expanded graphite added activated carbon filter material and preparation method thereof
CN104437404A (en) * 2014-11-13 2015-03-25 蚌埠德美过滤技术有限公司 Low-cost activated carbon air filter material added with lotus seed pot and shaddock peel and preparation method of air filter material

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GB9026244D0 (en) 1991-01-16
CN1068754A (en) 1993-02-10
AU9015191A (en) 1992-06-25

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