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WO2004031474A1 - Procede de reduction de depots dans des systemes industriels contenant de l'eau par addition d'un solvant organique hydrophobe et d'un tensioactif - Google Patents

Procede de reduction de depots dans des systemes industriels contenant de l'eau par addition d'un solvant organique hydrophobe et d'un tensioactif Download PDF

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Publication number
WO2004031474A1
WO2004031474A1 PCT/EP2002/011216 EP0211216W WO2004031474A1 WO 2004031474 A1 WO2004031474 A1 WO 2004031474A1 EP 0211216 W EP0211216 W EP 0211216W WO 2004031474 A1 WO2004031474 A1 WO 2004031474A1
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WO
WIPO (PCT)
Prior art keywords
tenside
water
paper
organic solvent
deposits
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/EP2002/011216
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English (en)
Inventor
Alfred Pohlen
Gerhard Kern
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to AU2002346961A priority Critical patent/AU2002346961A1/en
Priority to PCT/EP2002/011216 priority patent/WO2004031474A1/fr
Priority to AT03755567T priority patent/ATE467721T1/de
Priority to EP03755567A priority patent/EP1556547B1/fr
Priority to DE60332549T priority patent/DE60332549D1/de
Priority to DE03755567T priority patent/DE03755567T1/de
Priority to AU2003273412A priority patent/AU2003273412A1/en
Priority to PCT/EP2003/011029 priority patent/WO2004031481A1/fr
Publication of WO2004031474A1 publication Critical patent/WO2004031474A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
    • C02F5/08—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents
    • C02F5/10—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
    • C02F5/08—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents
    • C02F5/10—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances
    • C02F5/12—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances containing nitrogen
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/02—Agents for preventing deposition on the paper mill equipment, e.g. pitch or slime control
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/02—Non-contaminated water, e.g. for industrial water supply
    • C02F2103/023—Water in cooling circuits
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/26—Nature of the water, waste water, sewage or sludge to be treated from the processing of plants or parts thereof
    • C02F2103/28—Nature of the water, waste water, sewage or sludge to be treated from the processing of plants or parts thereof from the paper or cellulose industry
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2305/00—Use of specific compounds during water treatment
    • C02F2305/04—Surfactants, used as part of a formulation or alone

Definitions

  • Deposits forming within the water circuits in industrial plants on plant are well known to cause problems in the processes for which these plants are used. For instance scale forming on the surfaces of a heat-exchanger will reduce the efficiency of heat-transfer.
  • deposits can lead mechanical breakdown of the cooling surfaces.
  • deposits forming in the circuits can lead to detachment of these deposits and can lead to defects in the paper sheet or to breaks in production.
  • the water circuit in a paper machine where the dispersed pa- permaking fibres and other solids are initially separated from the slurry in a forming device to make the paper sheet, usually a continuously moving sieve, is normally called the white-water I (one) circuit.
  • the water in this circuit is recycled and continuously enriched with more papermaking solids.
  • a second circuit where further water is pressed or drawn from the wet paper sheet and treated, for instance, to retrieve lost fibre or to clarify the water for further use is usually called white-water II (two) .
  • Deposits forming in these two circuits can create serious problems for the paper- making process. Further it can be clearly demonstrated that a clean paper machine will have a significantly better runabil- ity than when the white water circuits are clean.
  • the deposits which tend to form in paper machine water circuits and on parts which come in contact with the circuit contents can be caused by a variety of factors. So, microorganisms often find ideal growing conditions in a paper machine due to the warm temperature and substances present which can act as nutrients. These micro-organisms do not only multiply in the circuit water but also can form slime on sur- faces. Further, many of the additives used in papermaking such as retention aids, charged polymers used for fixing ani- onic trash, sizing agents and wet-strength resins can contribute to the deposit problems. Even natural resins from pulp, either chemical pulp or from mechanical pulp, are a known problem in this respect. Further, if coated paper is broked and re-cycled back into the stock, it brings the synthetic binders used in the coating with it contributing to the problem known as "white pitch".
  • waste paper and board is a well known source of deposit causing substances known as stickies.
  • patent EP 0 517 316 the addition of a hydrocarbon solvent together with at least one tenside to the pulper of a paper- making system using secondary fibre containing hot melt or pressure-sensitive adhesive contaminants is disclosed. It can reduce the amount of sticky material being liberated from the furnish into the aqueous pulp slurry. This process functions whereby during the pulping processes, where the adhesive tape etc. is separated from the fibres through thermal or mechanical energy, the addition of the solvent and tenside allows better separation of the adhesive contaminants from the fibres whereby the majority of the adhesive substance remains attached to the original substrate, namely the adhesive tape, which would then be removed by mechanical screening. The fibre would pass on in the system with lower levels of contamination.
  • patent EP 0 731 776 it is disclosed that an oil-in-water emulsion containing organic solvents and tensides can be added to an aqueous system that transports solids, for instance in a papermaking process, to prevent slime formation and reduce microbiological growth. It is shown that levels of micro-organisms in the water phase can be significantly reduced thus reducing deposits that may be caused by such micro-organisms .
  • lignosulphonates as in EP 0 496 905, have been used for deposit control whereby it is set that the growth of microbes can be influenced so that the growth-rate of sessile or slime-forming micro-organisms is reduced and at the same time thus allowing the presence of non-sessile microorganisms to predominate consequently reducing the tendency towards slime deposits but possibly increasing the level of non-sessile (free-swimming) micro-organisms, which anyway should not disturb the process of papermaking.
  • a reduction in the number of non-sessile microbes is not sought.
  • an object of the present invention is to provide deposit control effect on many types of deposits all at the same time and not on just one specific kind of deposit as other products which have usually to be used in combination.
  • the present invention provides a method for reducing deposits in industrial systems containing water by addition of at least one hydrophobic organic solvent in combination with at least one tenside to the aqueous system either proportional to the volume of water or proportional to the level of any solids transported in the water, characterised in that the at least one tenside constitutes 0,1 % w/w to 10 % w/w of the overall amount of organic solvent and tenside to be added to the system.
  • Preferred embodiments may be derived from the subclaims .
  • the organic solvent is a hydrogen treated petroleum distillate fraction.
  • the combination of organic solvent and tenside are preferably derived and replaced by citrus oils.
  • the tenside is selected from the group consisting of alkyl benzene sulphonate alcohol amine salt, polyethylene glycolethyl ether, alkyl sulphonsuccinate sodium salt and/or aliphatic alcohol ethoxylate.
  • the organic solvent and tenside are pre-mixed and the mixture contains essentially no water.
  • the organic solvent and the ten- side may be added directly or indirectly into a white water circuit of a paper or board machine or into the circuits of a pulp de-watering machine.
  • the components of the additive i.e. the organic solvent and the tenside do not form an emulsion but discrete small droplets that may adsorb to hydrophobic surfaces.
  • a deposit control effect on many types of deposits can be achieved.
  • any of or combinations of various types of deposit control agents can be replaced, making treatment more simple, avoiding toxic substances. According to practical results better long-term results can be achieved compared with conventional combi-systems .
  • the hydrocarbon liquid was dispersed into droplets of such a size that although it still preferentially coated any hydrophobic surfaces in the paper machine thus affording the required protection against deposit formation, there were no hydrocarbon droplets present large enough to cause so called oil- spots in the paper sheet.
  • the invented process has distinct advantages over many conventional systems in that it uses products that when used as in this process are essentially harmless, and that the effect is such that by preventing the contamination from adhering to the surfaces it is independent of the type of contamination whether chemical, from natural or synthetic adhesive materials or from the activities of slime forming micro-organisms.
  • clarified water derived from white- water II was held in a large sedimentation vessel to allow further solids to sediment out before using this water as process water once again. Due to the time the water stayed in this vessel there was a strong tendency for anaerobic bacteria to grow creating smells.
  • the primary conventional biocide system being shock-dosed into the main white water circuits of the paper machine was replaced with a continual dosage of a product as in the invented process whereby after a time, less flecks and holes were observed in the paper being produced.
  • the mixture of hydrocarbon solvents with tensides as relating to the method of this invention can be dosed in appropriate quantities into an aqueous system and measuring the effects in the way described it has been possible to demonstrate that this method is able to successfully solve the problem as set out for this invention.
  • substances such as a paper machine white water circuit can be in the range of 10 to 10000 ppm based on the dry weight of solids contained in the aqueous system, preferably 50 to 500 ppm, typically but more especially from 150 to 400 ppm.
  • the product can be dosed at a typical level of 2 to 25 ppm, preferably 4 to 10 ppm, based on the water volume flowing through the system.
  • a solution of a blend of surfactants in a solvent mixture was produced by simple mixing whereby the surfactants constituted 2.5 % w/w of the mixture. The components were mixed together for 30 minutes and the resulting product was stored at room temperature.
  • the solvent used was a de-aromatised white spirit originating as a hydrogen-treated petroleum distillate fraction (naptha) with a boiling range average of 198°C.
  • Example 2 Preparation of a mixture of an organic solvent with tenside A solution of a blend of surfactants in a solvent mixture was produced by simple mixing whereby the surfactants constituted 2.3 % w/w of the mixture. The components were mixed together for 30 minutes and the resulting product was stored at room temperature .
  • the main solvent used was a de-aromatised white spirit with a boiling range average of 198°C.
  • the product as described in example 2 was added continually to the pulp stream coming onto the de-watering machine at a rate of 10 ppm based on the volume of pulp flowing onto the de-watering machine.
  • the de-watering machine could be run without manual cleaning of the guide rolls for up to 2 days continually, thus saving considerable down-time for cleaning.
  • Example 4 Reduction of deposits on the former of a board machine
  • Example 5 Reduction of deposits in the circuit of a fine paper machine using coated broke as part raw material with respect to effect on sizing
  • the machine was supplied with stock which contained up to 50% coated broke from other coating machines in the same works plus fresh liquid pulp from the integrated chemical pulp mill.
  • the sizing with AKD on the machine was critical as due to the pulp mix and other additives used, it was difficult to hold the degree of sizing in specification.
  • the product as in example 1 was dosed into the paper machine at a rate of 400 ppm based on dry paper being produced. Two dosing points were tried in trials. One in the stock before the sizing agent addition and in a later trial one in a point after the sizing agent addition to see if any negative influence on the sizing occurred.
  • Example 6 Reduction of problems in a special paper machine caused by pitch by replacing a biocide-dispersant deposit control system
  • a paper machine making light weight, wood-free speciality paper was suffering badly from deposits caused by use of resin size.
  • a deposit control system was in use consisting of 400 ppm dispersant and 370 ppm biocide based on dry paper weight.
  • a further deposit problem always found on this machine at that time was deposits of spun-fibres building up on the holey-rolls in the head-box. On breaking free, these deposits produced holes and breaks.
  • Example 7 Reduction of breaks, elimination of biocide and cost reduction in an offset paper machine by replacing a biocide/bio-dispersant/pitch- dispersant deposit control system
  • a fine paper machine was producing office-quality offset printing paper and copy paper at a rate of approximately 380 tons per day.
  • the white water circuits were being treated with biocides with the aim of reducing deposits caused by biological slime.
  • the biocides were being dosed into white water I, white water II and to the machine chest.
  • a bio-dispersant was also being added to the white water II circuit .
  • the addition levels were 65 ml/minute of product to both dosing locations meaning approximately 400 grams of the products of this invention per dry ton of paper produced.
  • pitch dispersant previously added to treat deposits caused by resins was left unchanged at 200 litres per day meaning approximately somewhat over 500 grams of pitch dispersant per ton (g/t) of dry paper.
  • the pitch dispersant was reduced to 100 litres/day or approximately 250 g/t on dry paper produced. After a further 12 months running with the modified deposit control configuration, the pitch control dispersant was eliminated completely.
  • the dosing configuration for the paper machine deposit control was as follows: Product as in example 1: 110 g/t (ppm) based on dry paper production dosed continually into white-water II chest entry pipework. Aim was to keep this system and including clear-filtrate pipework deposit free.
  • Product as in example 1 130 g/t (ppm) based on dry paper production dosed continually into machine chest. Aim here was to prevent deposits from natural pitch from the chemical pulp forming deposits on the chest walls and exit pipe-work.
  • Product as in example 2 110 g/t (ppm) based on dry paper production dosed continually into the pipe-work leading to the profile regulation water cross-flow distributor. Aim here was to keep the cross-flow distributor for the profile water free of deposits .
  • Example 8 Reduction of deposit problems in a special-paper machine making wet-strength paper by addition of a solvent in combination with a tenside to control deposits
  • a paper machine was producing label paper using wood-free pulp.
  • Various paper grades were being produced in both acid and neutral/lightly alkaline conditions.
  • the process pH changes were to allow certain wet-strength resins to be used depending on the paper grade.
  • the deposit control system was based on a continual addition of an alkaline solution of a low molecular weight lignosul- phonate product. This system was said to be based on creating a biological equilibrium allowing non-slime-forming microorganisms to predominate over slime-formers.
  • the papermaking process still suffered from deposit problems although from a variety of reasons thought to be due to the complex and ever-changing papermaking chemistry especially the wet-strength additives.
  • the main problem was severe chemical deposits on the formation wire resulting is frequent cleaning stops .
  • Increases in the addition of the product used in the existing deposit control system to high levels did not improve the deposit situation on the wire.
  • Example 9 Reduction of deposits and prevention of anaerobic smell-causing conditions in a paper machine circuit by use of a solvent/tenside mixture in combination with an oxidizing biocide
  • a fine-paper grade was being produced on a paper machine where residual solids in the filtrate water from the white water II fibre recovery unit were allowed to settle out in a large volume, conical sedimentation vessel.
  • the flow through this vessel which had a volume of 400 m 3 /min was approximately 1.5 m 3 /min. Due to the activity of micro-organisms, there was a tendency for the conditions in this sedimentation funnel to go anaerobic resulting in production of low molecular weight fatty acids from the metabolism of anaerobic bacteria. Furthermore, H 2 S was also sometimes measurable contributing to smell and corrosion.
  • the white water I circuit was being treated with a non- oxidizing biocide of the type 2, 2-Dibromo-3- nitrilopropionamid (DBNPA) . Further, a dispersant product was being added to the white water I circuit as part of the deposit control concept.
  • DBNPA 2-Dibromo-3- nitrilopropionamid
  • Another dose of DBNPA biocide was being added to the filtrate after the fibre-recovery before entry into the sedimentation vessel .
  • the DBNPA addition to the filtrate water was later replaced by an oxidizing biocide, bromo chloro dimethyl hydantoin (BCDMH) added in dissolved form to the filtrate before the sedimentation vessel.
  • BCDMH oxidizing biocide was intended to eliminate the need for DBNPA whilst contributing an oxidising product to combat anaerobic conditions.
  • Example 10 Reduction of deposit problems in a special-paper machine making wet-strength paper by addition of a solvent in combination with a tenside to control deposits
  • a paper machine used shock doses of biocides for biological slime control but still had problems with resinous deposits in the white water circuits and on the formation wire.
  • Two types of biocide were being shock dosed alternately, the first type, a quaternary ammonium salt - didecyl dimethyl ammonium chloride, the second with bromo nitro propandiol as active ingredient.
  • a product based on a solution of a tenside mixture in a hydrophobic solvent as in example 1 was added continually at 300 ppm (based on dry paper) to the white water I circuit in addition to the existing biocide dose.
  • During the first 24 hours there were many more problems from resin deposits in the paper than normal but leading rapidly thereafter to a much improved runability.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Chemistry (AREA)
  • Paper (AREA)

Abstract

L'invention concerne un procédé de réduction des dépôts dans des systèmes industriels contenant de l'eau par addition au système aqueux, d'au moins un solvant organique hydrophobe en combinaison avec au moins un tensioactif, en quantité soit proportionnelle au volume d'eau, soit proportionnelle à la quantité de solides transportés par l'eau, le tensioactif constituant 0,1 % à 10% en poids de la quantité totale de solvant organique et du tensioactif ajoutés au système.
PCT/EP2002/011216 2002-10-07 2002-10-07 Procede de reduction de depots dans des systemes industriels contenant de l'eau par addition d'un solvant organique hydrophobe et d'un tensioactif Ceased WO2004031474A1 (fr)

Priority Applications (8)

Application Number Priority Date Filing Date Title
AU2002346961A AU2002346961A1 (en) 2002-10-07 2002-10-07 Method for reducing deposits in industrial systems containing water by addition of hydrophobic organic solvent and tenside
PCT/EP2002/011216 WO2004031474A1 (fr) 2002-10-07 2002-10-07 Procede de reduction de depots dans des systemes industriels contenant de l'eau par addition d'un solvant organique hydrophobe et d'un tensioactif
AT03755567T ATE467721T1 (de) 2002-10-07 2003-10-06 Additiv und verfahren zur vermeidung oder zumindest zur verringerung von ablagerungen in wasserführenden industriellen systemen
EP03755567A EP1556547B1 (fr) 2002-10-07 2003-10-06 Additif et procede permettant d'eviter ou d'au moins reduire les depots dans les systemes industriels transportant de l'eau et/ou se trouvant en contact avec de l'eau
DE60332549T DE60332549D1 (de) 2002-10-07 2003-10-06 Additiv und verfahren zur vermeidung oder zumindest zur verringerung von ablagerungen in wasserführenden industriellen systemen
DE03755567T DE03755567T1 (de) 2002-10-07 2003-10-06 Additiv und verfahren zur verhinderung oder wenigstens verminderung von ablagerung in wasserführenden und/oder mit wasser in kontakt stehenden industrieanlagen
AU2003273412A AU2003273412A1 (en) 2002-10-07 2003-10-06 Additive and method for avoiding or at least reducing deposits in water bearing and/or contacting industrial systems
PCT/EP2003/011029 WO2004031481A1 (fr) 2002-10-07 2003-10-06 Additif et procede permettant d'eviter ou d'au moins reduire les depots dans les systemes industriels transportant de l'eau et/ou se trouvant en contact avec de l'eau

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2002/011216 WO2004031474A1 (fr) 2002-10-07 2002-10-07 Procede de reduction de depots dans des systemes industriels contenant de l'eau par addition d'un solvant organique hydrophobe et d'un tensioactif

Publications (1)

Publication Number Publication Date
WO2004031474A1 true WO2004031474A1 (fr) 2004-04-15

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2002/011216 Ceased WO2004031474A1 (fr) 2002-10-07 2002-10-07 Procede de reduction de depots dans des systemes industriels contenant de l'eau par addition d'un solvant organique hydrophobe et d'un tensioactif

Country Status (2)

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AU (1) AU2002346961A1 (fr)
WO (1) WO2004031474A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3151020A (en) * 1961-05-10 1964-09-29 Nalco Chemical Co Slime-controlled industrial process water system and process
EP0517360A1 (fr) * 1991-05-29 1992-12-09 Betz Europe, Inc. Prévention de contaminants adhésifs pour la fabrication du papier
EP0648414A2 (fr) * 1993-10-01 1995-04-19 Rohm And Haas Company Microémulsions complètement diluables à l'eau
US5916857A (en) * 1997-11-17 1999-06-29 Federal Service & Supply, Inc. Cleaning composition for removing viscid resinous organic matter

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3151020A (en) * 1961-05-10 1964-09-29 Nalco Chemical Co Slime-controlled industrial process water system and process
EP0517360A1 (fr) * 1991-05-29 1992-12-09 Betz Europe, Inc. Prévention de contaminants adhésifs pour la fabrication du papier
EP0648414A2 (fr) * 1993-10-01 1995-04-19 Rohm And Haas Company Microémulsions complètement diluables à l'eau
US5916857A (en) * 1997-11-17 1999-06-29 Federal Service & Supply, Inc. Cleaning composition for removing viscid resinous organic matter

Also Published As

Publication number Publication date
AU2002346961A1 (en) 2004-04-23

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