GB2147224A - Gas filtration - Google Patents
Gas filtration Download PDFInfo
- Publication number
- GB2147224A GB2147224A GB08326003A GB8326003A GB2147224A GB 2147224 A GB2147224 A GB 2147224A GB 08326003 A GB08326003 A GB 08326003A GB 8326003 A GB8326003 A GB 8326003A GB 2147224 A GB2147224 A GB 2147224A
- Authority
- GB
- United Kingdom
- Prior art keywords
- zro2
- glass fibre
- gas
- reacting
- sio2
- 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.)
- Granted
Links
- 238000001914 filtration Methods 0.000 title description 5
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000003365 glass fiber Substances 0.000 claims abstract description 9
- 239000000428 dust Substances 0.000 claims abstract description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 5
- 229910052681 coesite Inorganic materials 0.000 claims description 4
- 229910052906 cristobalite Inorganic materials 0.000 claims description 4
- 239000000377 silicon dioxide Substances 0.000 claims description 4
- 235000012239 silicon dioxide Nutrition 0.000 claims description 4
- 229910052682 stishovite Inorganic materials 0.000 claims description 4
- 229910052905 tridymite Inorganic materials 0.000 claims description 4
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 claims description 2
- 229910000287 alkaline earth metal oxide Inorganic materials 0.000 claims description 2
- 239000004615 ingredient Substances 0.000 claims description 2
- -1 10-25% Inorganic materials 0.000 claims 1
- 239000003513 alkali Substances 0.000 claims 1
- 239000002759 woven fabric Substances 0.000 claims 1
- 239000011398 Portland cement Substances 0.000 abstract description 2
- 239000004568 cement Substances 0.000 abstract description 2
- 230000002787 reinforcement Effects 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 6
- 239000000126 substance Substances 0.000 description 3
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical group O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- OMBRFUXPXNIUCZ-UHFFFAOYSA-N dioxidonitrogen(1+) Chemical compound O=[N+]=O OMBRFUXPXNIUCZ-UHFFFAOYSA-N 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 235000010269 sulphur dioxide Nutrition 0.000 description 1
- 239000004291 sulphur dioxide Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D39/00—Filtering material for liquid or gaseous fluids
- B01D39/14—Other self-supporting filtering material ; Other filtering material
- B01D39/20—Other self-supporting filtering material ; Other filtering material of inorganic material, e.g. asbestos paper, metallic filtering material of non-woven wires
- B01D39/2003—Glass or glassy material
- B01D39/2017—Glass or glassy material the material being filamentary or fibrous
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Glass Compositions (AREA)
- Filtering Materials (AREA)
Abstract
Dust is removed from hot acid-reacting gas by passing the gas through a filter medium comprising glass fibres having a content of combined ZrO2, such as are sold for the reinforcement of alkaline-reacting cement matrices, e.g. set Portland cement.
Description
SPECIFICATION
Method of filtering
This invention relates to a method of filtering hot acid-reacting gases to free them from particulate matter (dust).
In the control of air pollution, it is common practice to filter out dust from gases before treating them to remove gaseous chemical pollutants. Where the pollutant is sulphur dioxide or other strongly acid-reacting substance such as nitrogen peroxide and the gas containing it is at a temperature above about 100 C, conventional filtration media are of limited value. E-glass fibre is one of the best materials available, but its acid-resistance is only moderate.
We have now found that glass fibres of the kind sold for use in cement reinforcement, which are made with a content of combined zirconia (ZrO2) to give them improved resistance to the strongly alkaline conditions (pH about 12) prevailing in a matrix of set Portland cement, have very good resistance to hot dust-containing acid reacting gases.
According to the invention, therefore, dust is removed from a hot acid-reacting gas by passing the gas through a filter medium comprising glass fibres having a content of combined ZrO2.
In general, such fibres are made from a composition whose predominant ingredients are SiO2, 55-75%; alkalis plus alkaline earth metal oxide, 10-25%; and ZrO2, 5-25% by weight.
One particularly suitable form of fibre is that commercially available under the registered trade mark
Cem-FIL, whose composition in weight % is:
SiO2 62
Na2O 14.8
CaO 5.6
ZrO2 16.7 A1203 0.8
TiO2 0.1
Fibres of this kind are described in British Patent specification 1290 528 (in which % compositions are given in molecular weight percentages, not as here in ordinary weight percentages); and the fibres described in that specification can in general be used in the method of the present invention. So also can those described in British patent specification 2 071 081.
A filtration device for use in the method of the invention suitably takes the form of a bag or envelope dust filter (see Kirk-Othmer Encyclopedia of Chemical Technology, 3rd Edition, p.686 ff) in which the filter medium is glass fabric woven from ZrO2- containing glass fibre.
Claims (4)
1. A method of removing dust from a hot acid-reacting gas, in which the gas is passed through a filter medium comprising glass fibre having a content of combined ZrO2.
2. A method according to Claim 1, in which said glass fibre is made from a composition whose predominant ingredients are SiO2, 55-75%, 55-75%; alkali + alkaline earth metal oxide, 10-25%, and ZrO2 5-25% by weight.
3. A method according to Claim 2, in which said glass fibre has the composition SiO2, 62; Na2O, 14.8;
CaO, 5.6; Zoo2,16.7; Awl203,0.8; and TO2, 0.1% by weight.
4. A method according to any preceding Claim, in which said glass fibre is in the form of a woven fabric.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08326003A GB2147224B (en) | 1983-09-28 | 1983-09-28 | Gas filtration |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08326003A GB2147224B (en) | 1983-09-28 | 1983-09-28 | Gas filtration |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8326003D0 GB8326003D0 (en) | 1983-11-02 |
| GB2147224A true GB2147224A (en) | 1985-05-09 |
| GB2147224B GB2147224B (en) | 1986-10-15 |
Family
ID=10549432
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08326003A Expired GB2147224B (en) | 1983-09-28 | 1983-09-28 | Gas filtration |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2147224B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1486435A (en) * | 1973-11-03 | 1977-09-21 | Still C | Process for the separation of acid mists from the waste gases of sulphuric acid plants |
| GB1574014A (en) * | 1976-12-24 | 1980-09-03 | Whatman Reeve Angel Ltd | Filter tubes |
| GB2053022A (en) * | 1979-05-21 | 1981-02-04 | Monsanto Co | Fibre bed element and process for removering liquid aerosols from gases |
-
1983
- 1983-09-28 GB GB08326003A patent/GB2147224B/en not_active Expired
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1486435A (en) * | 1973-11-03 | 1977-09-21 | Still C | Process for the separation of acid mists from the waste gases of sulphuric acid plants |
| GB1574014A (en) * | 1976-12-24 | 1980-09-03 | Whatman Reeve Angel Ltd | Filter tubes |
| GB2053022A (en) * | 1979-05-21 | 1981-02-04 | Monsanto Co | Fibre bed element and process for removering liquid aerosols from gases |
Also Published As
| Publication number | Publication date |
|---|---|
| GB8326003D0 (en) | 1983-11-02 |
| GB2147224B (en) | 1986-10-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |