WO1990012103A1 - Way and plant for producing alcohol for motor fuel from cellulose bearing waste and rest materials - Google Patents
Way and plant for producing alcohol for motor fuel from cellulose bearing waste and rest materials Download PDFInfo
- Publication number
- WO1990012103A1 WO1990012103A1 PCT/SE1990/000248 SE9000248W WO9012103A1 WO 1990012103 A1 WO1990012103 A1 WO 1990012103A1 SE 9000248 W SE9000248 W SE 9000248W WO 9012103 A1 WO9012103 A1 WO 9012103A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- cellulose
- alcohol
- waste
- sugar
- motor fuel
- Prior art date
Links
- 239000000463 material Substances 0.000 title claims abstract description 17
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 title claims abstract description 15
- 229920002678 cellulose Polymers 0.000 title claims abstract description 14
- 239000001913 cellulose Substances 0.000 title claims abstract description 14
- 239000002699 waste material Substances 0.000 title claims abstract description 13
- 239000000446 fuel Substances 0.000 title claims abstract description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000004033 plastic Substances 0.000 claims abstract description 7
- 239000011111 cardboard Substances 0.000 claims abstract description 6
- 229920003023 plastic Polymers 0.000 claims abstract description 6
- 239000011521 glass Substances 0.000 claims abstract description 5
- 229910052742 iron Inorganic materials 0.000 claims abstract description 5
- 229920001282 polysaccharide Polymers 0.000 claims abstract description 5
- 238000004519 manufacturing process Methods 0.000 claims abstract 2
- 239000000123 paper Substances 0.000 claims description 12
- 238000000855 fermentation Methods 0.000 claims description 7
- 230000004151 fermentation Effects 0.000 claims description 7
- 230000007062 hydrolysis Effects 0.000 claims description 5
- 238000006460 hydrolysis reaction Methods 0.000 claims description 5
- 238000004821 distillation Methods 0.000 claims description 4
- 150000004676 glycans Chemical class 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 4
- 239000005017 polysaccharide Substances 0.000 claims description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 239000010794 food waste Substances 0.000 claims description 3
- 238000000746 purification Methods 0.000 claims description 3
- 239000004575 stone Substances 0.000 claims description 3
- 235000013311 vegetables Nutrition 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 claims 6
- 239000011343 solid material Substances 0.000 claims 3
- 238000003825 pressing Methods 0.000 claims 1
- 229910052751 metal Inorganic materials 0.000 abstract description 4
- 239000002184 metal Substances 0.000 abstract description 4
- 150000002739 metals Chemical class 0.000 abstract description 3
- 239000000203 mixture Substances 0.000 abstract description 2
- 239000010791 domestic waste Substances 0.000 abstract 2
- 239000007858 starting material Substances 0.000 abstract 1
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- 150000001298 alcohols Chemical class 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000002255 enzymatic effect Effects 0.000 description 2
- 229920005610 lignin Polymers 0.000 description 2
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 description 2
- 239000010893 paper waste Substances 0.000 description 2
- 238000012216 screening Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 description 1
- 239000005995 Aluminium silicate Substances 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 102000004190 Enzymes Human genes 0.000 description 1
- 108090000790 Enzymes Proteins 0.000 description 1
- 229920001131 Pulp (paper) Polymers 0.000 description 1
- 240000004808 Saccharomyces cerevisiae Species 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 235000012211 aluminium silicate Nutrition 0.000 description 1
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 235000019253 formic acid Nutrition 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 235000011167 hydrochloric acid Nutrition 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 239000006148 magnetic separator Substances 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 239000011087 paperboard Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- JTJMJGYZQZDUJJ-UHFFFAOYSA-N phencyclidine Chemical class C1CCCCN1C1(C=2C=CC=CC=2)CCCCC1 JTJMJGYZQZDUJJ-UHFFFAOYSA-N 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 235000010269 sulphur dioxide Nutrition 0.000 description 1
- 239000004291 sulphur dioxide Substances 0.000 description 1
- 239000001117 sulphuric acid Substances 0.000 description 1
- 235000011149 sulphuric acid Nutrition 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- 235000010215 titanium dioxide Nutrition 0.000 description 1
- 239000001993 wax Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
- C12P7/00—Preparation of oxygen-containing organic compounds
- C12P7/02—Preparation of oxygen-containing organic compounds containing a hydroxy group
- C12P7/04—Preparation of oxygen-containing organic compounds containing a hydroxy group acyclic
- C12P7/06—Ethanol, i.e. non-beverage
- C12P7/08—Ethanol, i.e. non-beverage produced as by-product or from waste or cellulosic material substrate
- C12P7/10—Ethanol, i.e. non-beverage produced as by-product or from waste or cellulosic material substrate substrate containing cellulosic material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B9/00—General arrangement of separating plant, e.g. flow sheets
- B03B9/06—General arrangement of separating plant, e.g. flow sheets specially adapted for refuse
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/10—Biofuels, e.g. bio-diesel
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/62—Plastics recycling; Rubber recycling
Definitions
- waste paper A part of the large amounts of waste which must be disposed of in one way or another is recycled, for instance certain types of waste paper, which can be used for recovering fibres for the cellulose industry.
- waste paper is preferably newsprint, most of which consists of ground pulp or some other mechanical or chemo-mechanical pulp, i.e. with a high content of lignin and a smaller proportion of cellulose, whereas the present invention is in particular designed for such waste as cannot be used owing to its contents of other materials such as paper and cardboard lined or laminated with plastics, waxed paper, printed matter sized with glue not soluble in water, metallised paper, carbon paper, vegetable matter, food residues etc. emanating largely from domestic refuse.
- Domestic refuse contains iron and other metals, stony material, glass, plastic, wood, paper, cardboard, corrugated cardboard, vegetable matter, food residues etc. and could in the past not be used in any other way but by combustion.
- the waste is first finely broken down in a disintegrator 1 of any type whatsoever such as a hammer mill etc.
- Office paper which for reasons of security has been passed through a paper shredder can also be used with advantage, even if it includes carbonless copy paper and carbon paper.
- the mass is conveyed to a tank 6 prior to possible screening at 7.
- relatively large particles, some plastic fragments etc. are removed, and these can, together with the residues of the mash, be passed on for briquet- making or possibly returned to the defibration stage.
- a hydrolysis stage 9 where the cellulose and other polysaccharides are broken down to simpler types of sugar.
- the hydrolysis can be brought about with the aid of some acid, sulphuric acid, hydrochloric acid, formic acid, sulphur dioxide etc. or also by enzymatic means. Enzymatic decomposition with the aid of immobilised enzymes has proved to be advantageous both as regards the result and in economic respects.
- the pH-value is adjusted to a value suitable for fermentation by neutralising with, for instance, lime.
- Fermentation is carried out in large fermentation vats 11, where the given types of sugar are fermented to ethanol.
- the impurities contained in the mash such as the lignin, paper fillers, kaolin, titanium white, baryta white etc., waxes, plastics and other substances, do not interfere with the fermentation since under the prevailing conditions they are largely inert. Certain plastics can indeed dissolve to some extent in the alcohols formed, but this does not affect the distillation in any way.
- the mash residues from purification are conveyed to a briquetting press 14, where, possibly together with the solid components from bins 7, they are pressed to briquets, which after drying can be used as fuel.
- the amount of non-combustible filling matter in the briquets depends on the raw materials used and may vary between a few and several times ten per cent, but in general the briquets will have a good combustion value. It may also be possible to recover yeast from the mash residues.
- the ethanol which has been distilled off contains, in addition to a few per cent of water, also methanol, higher alcohols and esters, and it can, possibly after drying in order to reduce the water content, be used directly in motors.
- At least a part of the residues after distillation may be returned to fermentation stage 11 for further fermentation or it may separately be subjected to refermentation and then purified and discharged to the drain.
Abstract
The way and arrangement for manufacturing alcohol, specially for motor fuel, is based upon the use of unsorted cellulose bearing waste as starting material. Household waste consists largely of packages of plastic laminated cardboard and other products of mixed materials, where the cellulose material cannot be extracted through assorting. According to the invention such unsorted cellulose bearing mixture, specially household waste is decomposed (1), cleared (2) of iron, other metals, glass etc. and screened. Thereafter the cellulose and other polysaccarides are hydrolysed (9) to simpler sugar sorts which after being pH-adjusted (10) are fermented (11) to alcohol. The mash residuum is separated (12) and compressed (14) to briquettes. From the purified solution the alcohol is distilled (13). It can be used as motor fuel.
Description
Way and plant for producing alcohol for motor fuel from cellulose bearing waste and rest materials.
A part of the large amounts of waste which must be disposed of in one way or another is recycled, for instance certain types of waste paper, which can be used for recovering fibres for the cellulose industry. Such waste paper is preferably newsprint, most of which consists of ground pulp or some other mechanical or chemo-mechanical pulp, i.e. with a high content of lignin and a smaller proportion of cellulose, whereas the present invention is in particular designed for such waste as cannot be used owing to its contents of other materials such as paper and cardboard lined or laminated with plastics, waxed paper, printed matter sized with glue not soluble in water, metallised paper, carbon paper, vegetable matter, food residues etc. emanating largely from domestic refuse.
Domestic refuse contains iron and other metals, stony material, glass, plastic, wood, paper, cardboard, corrugated cardboard, vegetable matter, food residues etc. and could in the past not be used in any other way but by combustion.
The invention will now be described in greater detail with reference to the accompanying block diagrams, figs. 1 and 2.
The waste is first finely broken down in a disintegrator 1 of any type whatsoever such as a hammer mill etc. Office paper which for reasons of security has been passed through a paper shredder can also be used with advantage, even if it includes carbonless copy paper and carbon paper.
In a plant 2 iron is removed from the fragmented waste by means of a magnetic separator, and other metals are removed by means of a metal detector. Finally the fragmented waste is wind-sifted in order to remove bits of glass, small stones and other impurities, and it is collected in a bin 3 from where it is fed, on a conveyor belt 4, to hydrolysis stage 9, see fig. 1.
Depending on the composition of the waste further defibration in a mill or refiner 5 may be necessary, see fig. 2.
In certain cases it may be advantageous to make a slurry of the disintegrated paper sc as to obtain a mass suitable for pumping, which
is then pumped to the defibration stage, but in general this step is not necessary.
As regards defibration, an ordinary disc refiner will yield a good result, but a turbo refiner such as Asplund has proved to be particularly suitable and to produce very good defibration.
From the defibrator the mass is conveyed to a tank 6 prior to possible screening at 7. In the course of screening relatively large particles, some plastic fragments etc. are removed, and these can, together with the residues of the mash, be passed on for briquet- making or possibly returned to the defibration stage.
Following concentration in a thickener 6 the mass is conveyed to a hydrolysis stage 9, where the cellulose and other polysaccharides are broken down to simpler types of sugar. The hydrolysis can be brought about with the aid of some acid, sulphuric acid, hydrochloric acid, formic acid, sulphur dioxide etc. or also by enzymatic means. Enzymatic decomposition with the aid of immobilised enzymes has proved to be advantageous both as regards the result and in economic respects.
In a storage tank 10 the pH-value is adjusted to a value suitable for fermentation by neutralising with, for instance, lime.
Fermentation is carried out in large fermentation vats 11, where the given types of sugar are fermented to ethanol.
In 12 solid components are removed from the mash using sieves, filters, centrifuges or cyclones, ana the purified solution is conveyed to distillation stage 13.
The impurities contained in the mash such as the lignin, paper fillers, kaolin, titanium white, baryta white etc., waxes, plastics and other substances, do not interfere with the fermentation since under the prevailing conditions they are largely inert. Certain plastics can indeed dissolve to some extent in the alcohols formed, but this does not affect the distillation in any way.
The mash residues from purification are conveyed to a briquetting press 14, where, possibly together with the solid components from bins 7, they are pressed to briquets, which after drying can be used as fuel. The amount of non-combustible filling matter in the briquets depends on the raw materials used and may vary between a few and
several times ten per cent, but in general the briquets will have a good combustion value. It may also be possible to recover yeast from the mash residues.
The ethanol which has been distilled off contains, in addition to a few per cent of water, also methanol, higher alcohols and esters, and it can, possibly after drying in order to reduce the water content, be used directly in motors.
At least a part of the residues after distillation may be returned to fermentation stage 11 for further fermentation or it may separately be subjected to refermentation and then purified and discharged to the drain.
Claims
1. Method for producing alcohol from cellulose-containing waste and residue material, characterised in that the material is disintegrated and freed from the major part of the relatively heavy impurities contained therein, such as iron scrap, other metallic objects, glass, stones etc., whereupon cellulose and other polysaccharides contained in the waste are hydrolysed to produce simpler types of sugar, which are fermented, the alcohol formed being distilled off.
2. Method according to claim 1, characterised in that the
cellulose-containing waste and residue material includes paper,
cardboard, carton and/or corrugated cardboard, laminated or lined with plastic and/or wax, carbon paper, publicity material of various types, vegetable matter, food residues and other materials containing
polysaccharides.
3. Method according to claim 1 or 2, characterised in that after disintegration and purification, the material is, prior to hydrolysis, finely dispersed.
4. Method according to claim 3, characterised in that after fine dispersal the material is screened and then hydrolysed.
5. Method according to any of the preceding claims, characterised in that, after hydrolysis and/or after fermentation, solid material is separated.
6. Method according to any of the preceding claims, characterised in that after pressing to e.g. briquets the separated, solid material is used by way of fuel.
7. Method according to any of the preceding claims, characterised in that alcohol distilled off is treated further for drying and/or removal of other substances.
8. Arrangement for producing alcohol from cellulose-containing waste and residue material, characterised by device (1) for
disintegrating the material, device (2) for removing the major part of relatively heavy impurities contained therein, such as iron scrap, other metallic objects, glass, stone, etc., hydrolyser (9) for breaking down cellulose and other polysaccharides to simpler types of sugar, fermenter (11) for fermenting the simpler types of sugar to alcohol and distillation plant (13) for distilling off the alcohol.
9. Arrangement according to claim 8, characterised by refiner (5) for fine dispersal of the material after disintegration and purification.
10. Arrangement according to claim 9, characterised by sieve (7) or another separator downstream of refiner (5).
11. Arrangement according to any of claims 8, 9 or 10,
characterised by separator(s) (12) for separating solid material after hydrolyser (9) and/or after fermenter (11).
12. Arrangement according to any of claims 8 to 11, characterised by a press such as briquet press (14) for the material separated from sieve (7) and/or separator or separators (12).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE8901311A SE466156B (en) | 1989-04-12 | 1989-04-12 | SETTING AND CONSTRUCTION FOR MANUFACTURING ENGINE SPRING OF CELLULOUS WASTE AND WASTE MATERIALS |
| SE8901311-4 | 1989-04-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO1990012103A1 true WO1990012103A1 (en) | 1990-10-18 |
Family
ID=20375648
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/SE1990/000248 WO1990012103A1 (en) | 1989-04-12 | 1990-04-11 | Way and plant for producing alcohol for motor fuel from cellulose bearing waste and rest materials |
Country Status (3)
| Country | Link |
|---|---|
| AU (1) | AU5449890A (en) |
| SE (1) | SE466156B (en) |
| WO (1) | WO1990012103A1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000027954A1 (en) * | 1998-11-06 | 2000-05-18 | Christian Widmer | Method for utilizing waste |
| DE19909328B4 (en) * | 1998-11-06 | 2004-09-23 | Christian Widmer | Waste recovery operations |
| WO2008099038A2 (en) | 2007-02-15 | 2008-08-21 | Industrias Mecánicas Alcudia, S.A. | Method for recovering energy from the organic fraction of solid urban waste and associated facility |
| WO2008107044A1 (en) * | 2007-03-07 | 2008-09-12 | Dsm Ip Assets B.V. | Process for drying and purifying a particulate cellulose/plastic waste mixture |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4425433A (en) * | 1979-10-23 | 1984-01-10 | Neves Alan M | Alcohol manufacturing process |
-
1989
- 1989-04-12 SE SE8901311A patent/SE466156B/en not_active IP Right Cessation
-
1990
- 1990-04-11 AU AU54498/90A patent/AU5449890A/en not_active Abandoned
- 1990-04-11 WO PCT/SE1990/000248 patent/WO1990012103A1/en unknown
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4425433A (en) * | 1979-10-23 | 1984-01-10 | Neves Alan M | Alcohol manufacturing process |
Non-Patent Citations (1)
| Title |
|---|
| ADVANCES IN APPLIED MICROBIOLOGY, Vol. 26, 1980, D. PERLMAN: "Ethanol production by fermentation", see page 189 - page 195. * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000027954A1 (en) * | 1998-11-06 | 2000-05-18 | Christian Widmer | Method for utilizing waste |
| DE19909328B4 (en) * | 1998-11-06 | 2004-09-23 | Christian Widmer | Waste recovery operations |
| WO2008099038A2 (en) | 2007-02-15 | 2008-08-21 | Industrias Mecánicas Alcudia, S.A. | Method for recovering energy from the organic fraction of solid urban waste and associated facility |
| WO2008107044A1 (en) * | 2007-03-07 | 2008-09-12 | Dsm Ip Assets B.V. | Process for drying and purifying a particulate cellulose/plastic waste mixture |
Also Published As
| Publication number | Publication date |
|---|---|
| SE8901311D0 (en) | 1989-04-12 |
| AU5449890A (en) | 1990-11-05 |
| SE466156B (en) | 1992-01-07 |
| SE8901311L (en) | 1990-10-13 |
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