EP0791099A1 - Verfahren zur gewinnung von zellstoff - Google Patents
Verfahren zur gewinnung von zellstoffInfo
- Publication number
- EP0791099A1 EP0791099A1 EP95939246A EP95939246A EP0791099A1 EP 0791099 A1 EP0791099 A1 EP 0791099A1 EP 95939246 A EP95939246 A EP 95939246A EP 95939246 A EP95939246 A EP 95939246A EP 0791099 A1 EP0791099 A1 EP 0791099A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- radicals
- sio
- monovalent
- values
- units
- 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
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C3/00—Pulping cellulose-containing materials
- D21C3/22—Other features of pulping processes
- D21C3/222—Use of compounds accelerating the pulping processes
Definitions
- the invention relates to a process for the production of pulp from fibrous materials, in which organosilicon compounds are added to the chemical pulping process.
- lignin a polymer made up of hydroxyphenylpropane units.
- lignin a polymer made up of hydroxyphenylpropane units.
- Lignin is dissolved out of the fibrous material by an aqueous digestion solution which contains NaOH and Na 2 S as the main components.
- organic surfactants can be added to increase the cellulose yield.
- ethylene oxide / propylene oxide block copolymers is known from US Pat. No. 3,909,345 and the use of ethoxylated alcohols and ethoxylated dialkylphenols in the alkaline sulfate process from US Pat. No. 5,250,152.
- the object was to provide an improved process for obtaining pulp from fibrous materials by means of a chemical pulping process.
- the invention relates to a method for obtaining pulp from fibrous materials, in which the fibrous materials are reacted with a chemical digestion solution in the presence of organosilicon compounds.
- a measure of the residual lignin content in the pulp is the kappa number, which corresponds to the consumption of milliliters of 0.1 normal (3.161 g / l) potassium permanganate solution per gram of pulp.
- the reduction in digestion solution causes an increase in the cellulose yield based on the fiber used, since fewer carbohydrates, in particular hemicelluloses, are liberated, and thus fewer by-products are formed.
- a certain kappa number can also be achieved when using the organosilicon compounds by shortening the cooking time.
- the kappa number is reduced under constant digestion conditions.
- organosilicon compounds improve the strength values of pulp and reduce cellulose degradation.
- Preferred organosilicon compounds are organic siloxanes and silanes which have an organic polar group and a hydrophobic siloxane or sil content and thereby have surface-active properties at the phase boundaries liquid / liquid, liquid / gaseous and liquid / solid.
- Preferred organosilicon compounds are the organopolysiloxane compounds which consist of units of the general formulas (I) to (VII)
- R monovalent hydrocarbon radicals with 1 to 18 carbon atoms
- R 1 divalent C 1 to C 18 hydrocarbon residues
- R 2 is hydrogen or monovalent C 1 to C 6 alkyl radicals
- R 3 are hydrogen atoms, monovalent C 1 to C 6 acyl radicals, C 1 to C 6 hydrocarbon radicals or OSO 3 X,
- X are hydrogen atoms, alkali or optionally substituted with C 1 - to C 18 -hydrocarbon radicals
- d denotes the values 0, 1, 2, 3 or 4,
- organopolysiloxane compounds have at least one unit of the general formulas (V) to (VII).
- organosilicon compounds are the organosilanes of the general formula (XII)
- R has the above meanings.
- a can be within the formula be reichs [O (CR 2 ) a ] b of a remainder assume different values.
- the formula range [O (CR 2 ) a ] b can be a polyethylene glycol / polypropylene glycol block copolymer.
- hydrocarbon radicals R are alkyl radicals, such as the methyl, ethyl, n-propyl, iso-propyl, n-butyl, iso-butyl, tert-butyl, n-pentyl, iso-pentyl, neo Pentyl, tert-pentyl; Hexyl radicals, such as the n-hexyl radical; Heptyl residues, such as the n-heptyl residue; Octyl radicals, such as the n-octyl radical and iso-octyl radicals, such as the 2,2,4-trimethylpentyl radical; Nonyl radicals, such as the n-nonyl radical; Decyl radicals, such as the n-decyl radical; Dodecyl radicals, such as the n-dodecyl radical; Octadecyl radicals, such as the n-octt
- At least 90 mol% of the radicals R are preferably methyl, ethyl or phenyl radicals, in particular methyl radicals.
- divalent radicals R 1 are saturated straight-chain or branched-chain or cyclic alkylene radicals, such as the methylene and ethylene radical, and also propylene, butylene, pentylene, hexylene, 2-methylpropylene, cyclohexylene radicals, or unsaturated alkylene or arylene radicals, such as Hexenylene and phenylene
- Examples of the monovalent alkyl radicals R 2 and R 3 are listed in the above examples of R.
- Examples of the hydrocarbon radicals on the ammonium ions in X are the hydrocarbon radicals mentioned for R.
- Examples of the C 1 - to C 6 -acyl radicals R 3 are the acetyl, propionyl and n-butyryl radical.
- glycoside residues Z examples include hexoses and pentoses, such as glucose, fructose, galactose, mannose, talose, allos, altrose, idose, arabinose, xylose, lyxose and ribose, with glucose being particularly preferred.
- the glycoside residues Z preferably contain one or two monosaccharide units.
- a means the values 2 or 3.
- b means integer values from 3 to 100, in particular 10 to 70.
- the units of the organopolysiloxane compound Preferably 2 to 50%, in particular 5 to 20%, of the units of the organopolysiloxane compound have the general formulas (V) to (VII).
- At least 95%, in particular at least 99%, of the units of the organopolysiloxane compound are preferably units of the general formulas (II), (VI) and (I). It is further preferred that the organopolysiloxane compound has an average viscosity of 20 to 500,000 mPa.s, particularly 200 to 60,000 mPa.s at 25 ° C.
- One organosilicon compound can be used, or mixtures of several organosilicon compounds can also be used.
- organosilicon compounds are preferably used per 100 parts by weight of dry fibrous materials.
- chemical digestion processes can be used:
- the digestion solution also known as white liquor, consists of the main components NaOH and Na 2 S.
- the sulfate process is preferably used.
- the process preferably contains 10 to 35, in particular 20 to 30 parts by weight of Na 2 O in the form of NaOH per 100 parts by weight of dry wood.
- the process is preferably carried out at 0.1 to 3 MPa, in particular at 0.5 to 1.5 MPa.
- the chemical processes can be carried out batchwise or continuously in a pulp cooker.
- the residence time of the mixture in the pulp cooker is preferably 10 minutes to 7 hours.
- all vegetable raw materials (fiber plants) which have a sufficient cellulose content and can be processed sufficiently easily can be used as fiber materials.
- Wood is preferably used, although in many countries wood waste from sawmills is also used as a raw material on a large scale. In addition, however, certain annual plants and grasses also play a subordinate role.
- the wood is used in the form of, for example, wood chips, chips or wood flour.
- the organosilicon compound a polyglykolether Kunststoff- tional water-soluble silicone surfactant was used (Pulpsil ® 950 S Wacker-Chemie GmbH, Kunststoff). Pulpsil ® 950 S will by reacting the organosiloxane compound of the formula
- H 2 C CH-CH 2 -O [CH 2 CH 2 O] 25 [CH 2 CH (CH 3 ) O] 25 H (XIV), in the presence of a platinum catalyst.
- the resulting organosilicon compound is represented by the formula (XV)
- a continuous pulp cooker with a capacity of 270 tons of dry wood substance in the form of sawdust per day was operated at 172 ° C and 0.95 MPa.
- the residence time of the mixture in the cooker was 15 minutes.
- 28 parts by weight of Na 2 O and 7 parts by weight of Na 2 S were present per 100 parts by weight of dry wood.
- the pulp obtained had a kappa diameter of about 52.
- Birch (Betula birch) from one
- the total yield of pulp was then determined before the fraction of undigested fibers (rejects) was determined in a Wennberg fiberiser for 10 minutes and after sieving again through a sieve with a 0.35 mm mesh size (Mantta sieve).
- the sifted pulp yield (total yield minus rejects) was given in percent, based on the oven-dried weight of wood chips.
- Wacker ® LO66 silicone oil is obtained by reacting the organosilicon compound of the formula (XVII)
- H 2 C CH-CH 2 O [CH 2 CH 2 O] 6.5 CH 3 (XVIII), prepared in the presence of a platinum catalyst.
- the resulting organosilicon compound is represented by the formula (IXX)
- Wacker ® SPG 120 VP from Wacker-Chemie GmbH, Kunststoff
- Wacker ® SPG 120 VP is a 50% solution of a siloxane-modified glycoside in water / isopropanol, the active ingredient being converted by reaction of the organosiloxane compound of the form (XVII) with the allyl polyglycol of the formula (XXI)
- H 2 C CH-CH 2 O [CH 2 CH 2 O] 1 - (glycosidyl) 1.8 (XXI), is produced in the presence of a platinum catalyst.
- the resulting organosilicon compound is represented by the formula (IXX), where Y is the formula (XXII)
- the organic surfactant B1 is a 1: 1 mixture of ethoxylated isostearyl alcohol (isostearyl (EO) 10 OH) and ethoxylated oleyl alcohol (Oleyl [EO] 20 OH).
- the organic surfactant B2 is a 1: 1 mixture of di-n-nonylphenol ethoxylates with different EO contents.
- the two phenol derivatives are identified by the formulas (XXIII) and (XXIV).
Landscapes
- Paper (AREA)
- Polysaccharides And Polysaccharide Derivatives (AREA)
- Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
- Silicon Polymers (AREA)
- Crystals, And After-Treatments Of Crystals (AREA)
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4440186 | 1994-11-10 | ||
DE4440186A DE4440186A1 (de) | 1994-11-10 | 1994-11-10 | Verfahren zur Gewinnung von Zellstoff |
PCT/EP1995/004411 WO1996015312A1 (de) | 1994-11-10 | 1995-11-09 | Verfahren zur gewinnung von zellstoff |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0791099A1 true EP0791099A1 (de) | 1997-08-27 |
EP0791099B1 EP0791099B1 (de) | 1999-03-17 |
Family
ID=6532990
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95939246A Expired - Lifetime EP0791099B1 (de) | 1994-11-10 | 1995-11-09 | Verfahren zur gewinnung von zellstoff |
Country Status (10)
Country | Link |
---|---|
US (1) | US6521084B1 (de) |
EP (1) | EP0791099B1 (de) |
JP (1) | JP2895240B2 (de) |
AT (1) | ATE177800T1 (de) |
BR (1) | BR9509642A (de) |
CA (1) | CA2205043C (de) |
DE (2) | DE4440186A1 (de) |
ES (1) | ES2131346T3 (de) |
FI (1) | FI118570B (de) |
WO (1) | WO1996015312A1 (de) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NO992021L (no) * | 1998-05-12 | 1999-11-15 | Dow Corning | FramgangsmÕte for pulpbehandling av tremasse |
DE19939866A1 (de) * | 1999-08-23 | 2001-03-01 | Wacker Chemie Gmbh | Zusammensetzung zur Erhöhung der Massenaufnahme von polaren Systemen in hydrophob-hydrophilen Hybridmaterialien |
US7390415B2 (en) * | 2002-07-22 | 2008-06-24 | Cytec Technology Corp. | Method and compositions for preventing or reducing aluminosilicate scale in alkaline industrial processes |
JP5122444B2 (ja) * | 2005-05-23 | 2013-01-16 | ダウ・コーニング・コーポレイション | サッカリド−シロキサンコポリマーを含むパーソナルケア組成物 |
US7964552B2 (en) * | 2006-12-15 | 2011-06-21 | E. I. Du Pont De Nemours And Company | Fluorosurfactant with disproportionate effect |
DE102008043944A1 (de) * | 2008-11-20 | 2010-05-27 | Wacker Chemie Ag | Entschäumerzusammensetzungen |
WO2012027073A1 (en) | 2010-08-23 | 2012-03-01 | Dow Corning Corporation | Saccharide siloxanes stable in aqueous environments and methods for the preparation and use of such saccharide siloxanes |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3147179A (en) | 1959-06-26 | 1964-09-01 | St Joe Paper Company | Pulping processes |
US3909345A (en) | 1972-12-14 | 1975-09-30 | Basf Wyandotte Corp | Method of treatment of wood pulp for greater efficiency in wood utilization |
DE3235256A1 (de) | 1982-09-23 | 1984-03-29 | Wacker Chemie Gmbh | In wasser leicht verteilbare antischaummittel |
US5250152A (en) | 1991-02-20 | 1993-10-05 | Betz Paperchem, Inc. | Ethoxylated alcohol and dialkylphenol surfactants as Kraft pulping additives for reject reduction and yield increase |
DE4306041A1 (de) * | 1993-02-26 | 1994-09-01 | Wacker Chemie Gmbh | Glycosidreste aufweisende Organosiliciumverbindungen und Verfahren zu deren Herstellung |
-
1994
- 1994-11-10 DE DE4440186A patent/DE4440186A1/de not_active Withdrawn
-
1995
- 1995-11-09 EP EP95939246A patent/EP0791099B1/de not_active Expired - Lifetime
- 1995-11-09 DE DE59505393T patent/DE59505393D1/de not_active Expired - Fee Related
- 1995-11-09 ES ES95939246T patent/ES2131346T3/es not_active Expired - Lifetime
- 1995-11-09 BR BR9509642A patent/BR9509642A/pt not_active Application Discontinuation
- 1995-11-09 AT AT95939246T patent/ATE177800T1/de not_active IP Right Cessation
- 1995-11-09 US US08/836,009 patent/US6521084B1/en not_active Expired - Fee Related
- 1995-11-09 WO PCT/EP1995/004411 patent/WO1996015312A1/de active IP Right Grant
- 1995-11-09 CA CA002205043A patent/CA2205043C/en not_active Expired - Fee Related
- 1995-11-09 JP JP8515715A patent/JP2895240B2/ja not_active Expired - Lifetime
-
1997
- 1997-05-06 FI FI971922A patent/FI118570B/fi not_active IP Right Cessation
Non-Patent Citations (1)
Title |
---|
See references of WO9615312A1 * |
Also Published As
Publication number | Publication date |
---|---|
CA2205043A1 (en) | 1996-05-23 |
EP0791099B1 (de) | 1999-03-17 |
ES2131346T3 (es) | 1999-07-16 |
FI971922A0 (fi) | 1997-05-06 |
JP2895240B2 (ja) | 1999-05-24 |
DE4440186A1 (de) | 1996-05-15 |
CA2205043C (en) | 2001-06-05 |
US6521084B1 (en) | 2003-02-18 |
FI118570B (fi) | 2007-12-31 |
ATE177800T1 (de) | 1999-04-15 |
WO1996015312A1 (de) | 1996-05-23 |
DE59505393D1 (de) | 1999-04-22 |
JPH09511800A (ja) | 1997-11-25 |
FI971922A (fi) | 1997-05-06 |
BR9509642A (pt) | 1997-09-16 |
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