CN101565907B - Bagasse alkaline pulping method by pre-extracting hemicellulose and product thereof - Google Patents
Bagasse alkaline pulping method by pre-extracting hemicellulose and product thereof Download PDFInfo
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Abstract
The invention relates to a bagasse alkaline pulping method by pre-extracting hemicellulose and a product thereof; the method includes the following steps of: preparing bagasse: depithing and washing the bagasse; pre-extraction, in which the extracted solvent is sodium hydroxide solution and the technical condition comprises an alkaline content of 1-8percent, a solid-to-liquid ratio of 1:2.5-8.0, extraction temperature of 80-180 DEG C, heating-up time of 10-120 minutes, holding time of 0-120 minutes, a pH value of 4.5-6.9 at a reaction end point, and the pressure of saturated steam pressure at corresponding temperature; liquid solid separation and washing: collecting filtrate to produce extract; and preparing the pulp by residue alkaline process. In the invention, bagasse extract capable ofextracting xyio-oligosacchandes, and the like and bagasse rough pulp for preparing whitened chemical pulp can be obtained; with a pre-extraction procedure added before stewing, the unscreened yield a nd hardness of bagasse are equivalent to that of pure pulping without pre-extraction by controlling the pre-extraction and stewing technical condition; bagasse biological refining on a pulping basis is realized; and the cost for pulping and pre-extracting hemicellulose is reduced, thereby saving resources.
Description
Technical field
The present invention relates to Chemical Engineering, pulping process field, be specifically related to bagasse alkaline pulping method of a kind of preextraction hemicellulose and products thereof.
Background technology
Bagasse is the accessory substance of cane sugar manufacture industry and the good fibrous raw material of pulping and paper-making; In the existing bagasse alkaline pulping known technology; Bagasse makes lignin dissolution through soda processes or kraft cooking and makes the fiber separation pulping, further makes bleach chemical pulp through washing, screening and bleaching.
In digestion process, the hemicellulose pentosan part stripping in the bagasse also gets into black liquor, and burning is converted into heat energy in alkali recovery process.In fact, the calorific value of carbohydrate such as pentosan only is equivalent to the half the of lignin, and the value of thermal transition is not high.
In recent years, people (Pulp and Paper Canada, 2006,107 (6), 38～43) such as A.van Heiningen proposes the theory of timber biological refining and in order to transform sulfate wood pulp factory.Its core concept is; Under the prerequisite that does not influence original slurrying; Before boiling, be that solvent extracts the part hemicellulose from leaf wood with the green liquor, and further be converted into products such as alcohol fuel and acetate through biochemical technology, economic and social benefit is better than simple slurrying.Embodied the biorefinery theory of lignocellulosic material each component high-value-use.But owing to adopt green liquor as extracting solvent and adding anthraquinone, there is safety issue in the extract of this method if be used for the food and feed additive preparation.
Containing the pentosan about 25% in the bagasse, and be main with xylan, is one of optimum feed stock of functional sugar alcohol such as wood sugar, xylo-oligosaccharide, xylitol and L-arabinose.At present, xylan is perhaps extracted in bagasse or simple slurrying merely.Also will not extract the complete skill scheme of the bagasse comprehensive utilization of xylan and fiber slurrying comprehensive consideration.
Summary of the invention
One of technical problem to be solved by this invention is to provide a kind of bagasse alkaline pulping method of preextraction hemicellulose, and a kind of preextraction method particularly is provided.
Two of technical problem to be solved by this invention is to provide the prepared product of bagasse alkaline pulping method that adopts above-mentioned preextraction hemicellulose, comprises that bagasse extract and bagasse slightly starch.
Three of technical problem to be solved by this invention is the purposes that provides above-mentioned bagasse extract and bagasse slightly to starch product.
A kind of bagasse alkaline pulping method of preextraction hemicellulose comprises the steps:
(1) bagasse is got the raw materials ready: bagasse is removed marrow and washing;
(2) preextraction: in rotary spherical digester or hydrolyzer, carry out, the extraction solvent is a sodium hydroxide solution, and process conditions are: to removing marrow over dry bagasse; Alkali charge is 1～8% by weight percentage, and solid-to-liquid ratio is 1: 2.5～8.0, and extracting temperature is 80～180 ℃; Pressure is the saturated vapour pressure under the relevant temperature; Heating-up time is 10～120 minutes, and temperature retention time is 0～120 minute, and reaction end pH value is 4.5～6.9;
(3) liquid-solid separation and washing are collected filtrating and are made extract;
(4) residue alkaline cooking slurrying.
Concrete, in step (2) preextraction, alkali charge can be 1,1.5,2,2.5,3,3.5,4,4.5,5,5.5,6,6.5,7,7.5 or 8%;
Solid-to-liquid ratio can be 1: 2.5,3,3.5,4,4.5,5,5.5,6,6.5,7,7.5 or 8;
Extract temperature and can be 80,90,100,110,120,130,140,150,160,170 or 180 ℃;
Heating-up time can for: 10,20,30,40,50,60,70,80,90,100,110 or 120 minutes; Temperature retention time can for: 0,10,20,30,40,50,60,70,80,90,100,110 or 120 minutes;
Reaction end pH value is 4.5,4.8,5,5.2,5.5,5.8,6,6.2,6.5,6.7 or 6.9.
On the basis of such scheme, the bagasse in the step (1) is for removing the bagasse of most of colloid through depositing fermentation naturally, except that the marrow method is one or more the combination in dry method, half wet process and the wet method.
On the basis of such scheme, in the step (1),, remove impurity to washing successively with rinsing maching and pressafiner except that the bagasse behind the marrow and dewatering, the mass dryness fraction of dehydration back bagasse is not less than 35%.
On the basis of such scheme; Preferred preextraction process conditions are in the step (2): to removing marrow over dry bagasse, alkali charge is 3～6%, and solid-to-liquid ratio is 1: 2.5～4.0; Extracting temperature is 140～170 ℃; Heating-up time is 40～100 minutes, and temperature retention time is 10～80 minutes, and reaction end pH value is 5.0～6.5.
On the basis of such scheme, in the step (3), the product that adopts continous mode to squeeze step (2) carries out liquid-solid separation and multi-stage countercurrent washing (carrying out the multi-stage countercurrent washing with rare filtrating and water), collects filtrating and makes extract, and the collection residue is subsequent use.
Known and disclosed technical scheme is adopted in continous mode squeezing and multi-stage countercurrent washing; The continous mode squeezing can be that screw press, roller press or the belt squeezing, and the first order is directly squeezed or with second level filtrating washing and squeezing, the second level is with washing of third level filtrating and squeezing; The rest may be inferred; Afterbody is collected the first order and the second level or first order filtrating and is made extract with water washing and squeezing, and it is subsequent use to collect the afterbody residue.
On the basis of such scheme, in the step (4), boiling is carried out in rotary spherical digester or transverse tube continuous steamer; Process conditions are: to the initial marrow over dry bagasse that removes, in NaOH, alkali charge is 7～16%; Sulphidity is 0～25%, and solid-to-liquid ratio is 1: 2.5～5.0, and boiling temperature is 120～180 ℃; Pressure is the saturated vapour pressure under the relevant temperature, and the heating-up time is 10～180 minutes, and temperature retention time is 0～120 minute.To the initial marrow over dry bagasse that removes, the bagasse unscreened yield is controlled to be 48～57%, thick starch degree KMnO
4Value is controlled to be 8～14, and the residual alkali number of black liquor is controlled to be 4～8g/l.
The present invention is through control preextraction and alkaline cooking process conditions, do not influence thick slurry pulping yield and hardness when making in the preextraction bagasse part hemicellulose.
Concrete, alkali charge can be 7,8,9,10,11,12,13,14,15 or 16%;
Sulphidity can be 0,2,5,8,10,12,15,18,20,22 or 25%, and adopting soda pulping to can be regarded as sulphidity is 0;
Solid-to-liquid ratio can be 1: 2.5,3,3.5,4,4.5 or 5.0;
Temperature can be 120,130,140,150,160,170 or 180 ℃;
Heating-up time can for: 10,20,40,60,80,100,120,140,160 or 180 minutes; Temperature retention time can for: 0,10,20,30,40,50,60,70,80,90,100,110 or 120 minutes.
On the basis of such scheme; Preferred alkaline cooking process conditions are in the step (4): to the initial marrow over dry bagasse that removes, in NaOH, alkali charge is 9～12%; Solid-to-liquid ratio is 1: 2.5～4.0; Boiling temperature is 150～170 ℃, and the heating-up time is 40～100 minutes, and temperature retention time is 10～60 minutes.
Adopt the prepared product of bagasse alkaline pulping method of above-mentioned preextraction hemicellulose; Be the bagasse extract of getting the raw materials ready through step (1) to the bagasse of (3), preextraction and liquid-solid separation and washing obtain; To removing marrow over dry bagasse; Bagasse organic matter recovery rate is 7～15%, and the bagasse extracting liquid pH value is 4.5～6.9, and component comprises xylo-oligosaccharide, wood sugar, L-arabinose, glucose, lignin, uronic acid and acetate.
Concrete bagasse organic matter recovery rate can be 7,8,9,10,11,12,13,14 or 15%.
Purposes to above-mentioned bagasse extract product; Further processing and following process to extract can adopt known and disclosed technology; Like acid hydrolysis, decolouring, depickling, concentrate, purification, ion-exchange, dehydration, hydrogenation are synthetic, biofermentation, enzyme hydrolysis, chromatography, ultrafiltration, crystallization and spray drying etc.; Further process products such as wood sugar, xylo-oligosaccharide, xylitol, L-arabinose; Also can process ethanol and other fermented product, also can from extract, extract acetate simultaneously through biological fermentation process.
Adopt the prepared product of bagasse alkaline pulping method of above-mentioned preextraction hemicellulose; For the bagasse of getting the raw materials ready through step (1) to the bagasse of (4), preextraction, liquid-solid separation and washing and alkaline cooking slurrying obtain is slightly starched; To the initial marrow over dry bagasse that removes; Unscreened yield is 48～57%, thick starch degree KMnO
4Value is 8～14.
Concrete, unscreened yield can be 48,50,52,55 or 57%.
Purposes to above-mentioned bagasse is slightly starched product adopts known and disclosed technology, as wash, screen, bleach and manufacture paper with pulp etc. with the thick slurry of bagasse further processing make bleach chemical pulp.
Beneficial effect of the present invention is:
The invention provides the bagasse alkaline pulping method of preextraction hemicellulose, under the prerequisite that does not influence bagasse slurrying, extract the part hemicellulose, the thick slurry of this bagasse can be further used for the preparation of bleach chemical pulp;
The hemicellulose extract component comprises xylo-oligosaccharide, wood sugar, L-arabinose, glucose, lignin, uronic acid and acetate etc., can be used for the preparation of food and feed additives such as wood sugar, xylitol, L-arabinose, ethanol and acetate and chemical products;
The present invention only increased the preextraction operation before boiling; The simple slurrying of comparing, equipment investment is few, and is not increasing under the prerequisite that pulp liquor consumes; Through control preextraction and cooking schedule, can make bagasse unscreened yield and hardness and bagasse not carry out preextraction and slurrying is suitable merely;
The present invention is from the angle of lignocellulosic material each component comprehensive utilization; Improve traditional bagasse alkaline pulping method; On engineering, realize being the bagasse biorefinery on basis, the comprehensive production cost of slurrying and hemicellulose preextraction is descended by a relatively large margin, practiced thrift resource with slurrying; Not only economic benefit is considerable, and social benefit is huge.
The specific embodiment
The concrete technical data of bagasse alkaline cooking all adopts known and disclosed scheme among reference examples of the present invention and the embodiment, not because of adopting certain concrete technology condition to influence preextraction method of the present invention to the general applicability of bagasse alkaline cooking pulping process and the integrality of the bagasse alkaline pulping technical scheme that constitutes whole preextraction hemicellulose.
The bagasse raw material removes the marrow rate all greater than 35% among following reference examples and the embodiment, and bagasse is not less than 35% through washing and dehydration back mass dryness fraction.Through preextraction; Adopt three grades of screw press that product is carried out liquid-solid separation and countercurrent washing, the first order is directly squeezed or with second level filtrating washing and squeezing, the second level is with washing of third level filtrating and squeezing; The third level is with water washing and squeezing; Collect the first order and the second level or first order filtrating and make extract, screw press residue mass dryness fraction is not less than 35%, collects third level residue and supplies pulping by cooking to use.
Reference examples 1
To removing marrow over dry bagasse, in NaOH, alkali charge is 15%, and solid-to-liquid ratio is 1: 3, and boiling temperature is 164 ℃, and the heating-up time is 50 minutes, and temperature retention time is 40 minutes.Unscreened yield is 51%, hardness KMnO
4Value is 10～12.5, and the residual alkali number of black liquor is 4g/l.
Reference examples 2
To removing marrow over dry bagasse, in NaOH, alkali charge is 15%, and sulphidity is 15～20%, and solid-to-liquid ratio is 1: 3, and boiling temperature is 159 ℃, and the heating-up time is 90 minutes, and temperature retention time is 40 minutes.Unscreened yield is 52%, hardness KMnO
4Value is 8.5～12.5, and the residual alkali number of black liquor is 6g/l.
Embodiment 1
(1) bagasse is got the raw materials ready, and bagasse is removed marrow and washing;
(2) preextraction: in rotary spherical digester, carry out, the extraction solvent is a sodium hydroxide solution, and to removing marrow over dry bagasse, alkali charge is 3%, and solid-to-liquid ratio is 1: 3, and the preextraction temperature is 140 ℃, and the heating-up time is 45 minutes, and temperature retention time is 80 minutes, and reaction end pH value is 6.5;
(3) liquid-solid separation and washing, collect filtrating and make extract: bagasse organic matter recovery rate is 8.1%;
(4) residue alkaline cooking slurrying: to the initial marrow over dry bagasse that removes, in NaOH, alkali charge is 12%, and solid-to-liquid ratio is 1: 3; Boiling temperature is 164 ℃, and the heating-up time is 50 minutes, and temperature retention time is 30 minutes; Make bagasse and slightly starch, unscreened yield is 51～53%, hardness KMnO
4Value is 10～12, and the residual alkali number of black liquor is 4～6g/l.
Embodiment 2
(1) bagasse is got the raw materials ready, and bagasse is removed marrow and washing;
(2) preextraction: in rotary spherical digester, carry out, the extraction solvent is a sodium hydroxide solution, and to removing marrow over dry bagasse, alkali charge is 3%, and solid-to-liquid ratio is 1: 3, and the preextraction temperature is 160 ℃, and the heating-up time is 50 minutes, and temperature retention time is 20 minutes, and reaction end pH value is 5.9;
(3) liquid-solid separation and washing, collect filtrating and make extract: bagasse organic matter recovery rate is 10.3%;
(4) residue alkaline cooking slurrying: to the initial marrow over dry bagasse that removes, in NaOH, alkali charge is 12%, and solid-to-liquid ratio is 1: 3; Boiling temperature is 164 ℃, and the heating-up time is 50 minutes, and temperature retention time is 20 minutes; Make bagasse and slightly starch, unscreened yield is 51～53%, hardness KMnO
4Value is 10～12, and the residual alkali number of black liquor is 4～6g/l.
Embodiment 3
(1) bagasse is got the raw materials ready, and bagasse is removed marrow and washing;
(2) preextraction: in hydrolyzer, carry out, the extraction solvent is a sodium hydroxide solution, to removing marrow over dry bagasse; Alkali charge is 3%, and solid-to-liquid ratio is 1: 5, and the preextraction temperature is 160 ℃; Heating-up time is 50 minutes, and temperature retention time is 20 minutes, and reaction end pH value is 5.9;
(3) liquid-solid separation and washing, collect filtrating and make extract: bagasse organic matter recovery rate is 10.7%;
(4) residue alkaline cooking slurrying: to the initial marrow over dry bagasse that removes, in NaOH, alkali charge is 12%; Sulphidity is 15～20%, and solid-to-liquid ratio is 1: 3, and boiling temperature is 159 ℃; Heating-up time is 90 minutes, and temperature retention time is 15 minutes, makes bagasse and slightly starches; Unscreened yield is 51～53%, hardness KMnO
4Value is 10～12, and the residual alkali number of black liquor is 4～6g/l.
Embodiment 4
(1) bagasse is got the raw materials ready, and bagasse is removed marrow and washing;
(2) preextraction: in hydrolyzer, carry out, the extraction solvent is a sodium hydroxide solution, to removing marrow over dry bagasse; Alkali charge is 5%, and solid-to-liquid ratio is 1: 3, and the preextraction temperature is 140 ℃; Heating-up time is 45 minutes, and temperature retention time is 80 minutes, and reaction end pH value is 6.2;
(3) liquid-solid separation and washing, collect filtrating and make extract: bagasse organic matter recovery rate is 9.0%;
(4) residue alkaline cooking slurrying: to the initial marrow over dry bagasse that removes, in NaOH, alkali charge is 10%, and solid-to-liquid ratio is 1: 3; Boiling temperature is 164 ℃, and the heating-up time is 50 minutes, and temperature retention time is 30 minutes; Make bagasse and slightly starch, unscreened yield is 51～53%, hardness KMnO
4Value is 10～12, and the residual alkali number of black liquor is 4～6g/l.
Embodiment 5
(1) bagasse is got the raw materials ready, and bagasse is removed marrow and washing;
(2) preextraction: in hydrolyzer, carry out, the extraction solvent is a sodium hydroxide solution, to removing marrow over dry bagasse; Alkali charge is 5%, and solid-to-liquid ratio is 1: 3, and the preextraction temperature is 160 ℃; Heating-up time is 50 minutes, and temperature retention time is 20 minutes, and reaction end pH value is 5.5;
(3) liquid-solid separation and washing, collect filtrating and make extract: bagasse organic matter recovery rate is 12.6%;
(4) residue alkaline cooking slurrying: to the initial marrow over dry bagasse that removes, in NaOH, alkali charge is 10%, and solid-to-liquid ratio is 1: 3; Boiling temperature is 164 ℃, and the heating-up time is 50 minutes, and temperature retention time is 20 minutes; Make bagasse and slightly starch, unscreened yield is 51～53%, hardness KMnO
4Value is 10～12, and the residual alkali number of black liquor is 4～6g/l.
Embodiment 6
(1) bagasse is got the raw materials ready, and bagasse is removed marrow and washing;
(2) preextraction: in rotary spherical digester, carry out, the extraction solvent is a sodium hydroxide solution, and to removing marrow over dry bagasse, alkali charge is 5%, and solid-to-liquid ratio is 1: 5, and the preextraction temperature is 160 ℃, and the heating-up time is 50 minutes, and temperature retention time is 20 minutes, and reaction end pH value is 5.5;
(3) liquid-solid separation and washing, collect filtrating and make extract: bagasse organic matter recovery rate is 12.7%;
(4) residue alkaline cooking slurrying: to the initial marrow over dry bagasse that removes, in NaOH, alkali charge 10%; Sulphidity is 15～20%, and solid-to-liquid ratio is 1: 3, and boiling temperature is 159 ℃; Heating-up time is 90 minutes, and temperature retention time is 15 minutes, makes bagasse and slightly starches; Unscreened yield is 51～53%, hardness KMnO
4Value is 10～12, and the residual alkali number of black liquor is 4～6g/l.
Embodiment process conditions and result see table 1.
Table 1
Continuous table 1
Claims (10)
1. the bagasse alkaline pulping method of a preextraction hemicellulose is characterized in that: comprise the steps: in regular turn
(1) bagasse is got the raw materials ready, and bagasse is removed marrow and washing;
(2) preextraction is carried out in rotary spherical digester or hydrolyzer, and the extraction solvent is a sodium hydroxide solution; Process conditions are: to removing marrow over dry bagasse, alkali charge is 1～8%, and solid-to-liquid ratio is 1: 2.5～8.0; Extracting temperature is 80～180 ℃, and pressure is the saturated vapour pressure under the relevant temperature, and the heating-up time is 10～120 minutes; Temperature retention time is 0～120 minute, and reaction end pH value is 4.5～6.9;
(3) liquid-solid separation and washing are collected filtrating and are made extract, and component comprises xylo-oligosaccharide, wood sugar, L-arabinose, glucose, lignin, uronic acid and acetate, and to removing marrow over dry bagasse, bagasse organic matter recovery rate is 7～15%;
(4) residue alkaline cooking slurrying, to the initial marrow over dry bagasse that removes, unscreened yield is 48～57%, thick starch degree KMnO
4Value is 8～14.
2. the bagasse alkaline pulping method of preextraction hemicellulose according to claim 1; It is characterized in that: the bagasse in the step (1) is for removing the bagasse of most of colloid through depositing fermentation naturally, except that the marrow method is one or more the combination in dry method, half wet process and the wet method.
3. the bagasse alkaline pulping method of preextraction hemicellulose according to claim 1 and 2; It is characterized in that: in the step (1); To washing successively with rinsing maching and pressafiner except that the bagasse behind the marrow and dewatering, remove impurity, the mass dryness fraction of dehydration back bagasse is not less than 35%.
4. the bagasse alkaline pulping method of preextraction hemicellulose according to claim 1; It is characterized in that: the preextraction process conditions in the step (2) are: to removing marrow over dry bagasse, alkali charge is 3～6%, and solid-to-liquid ratio is 1: 2.5～4.0; Extracting temperature is 140～170 ℃; Heating-up time is 40～100 minutes, and temperature retention time is 10～80 minutes, and reaction end pH value is 5.0～6.5.
5. the bagasse alkaline pulping method of preextraction hemicellulose according to claim 1 is characterized in that: in the step (3), the product that adopts continous mode to squeeze step (2) carries out liquid-solid separation, collects filtrating and makes extract, and it is subsequent use to collect residue.
6. the bagasse alkaline pulping method of preextraction hemicellulose according to claim 1 is characterized in that: in the step (4), boiling is carried out in rotary spherical digester or transverse tube continuous steamer; Process conditions are: to the initial marrow over dry bagasse that removes, in NaOH, alkali charge is 7～16%; Sulphidity is 0～25%, and solid-to-liquid ratio is 1: 2.5～5.0, and boiling temperature is 120～180 ℃; Pressure is the saturated vapour pressure under the relevant temperature, and the heating-up time is 10～180 minutes, and temperature retention time is 0～120 minute.
7. adopt the prepared bagasse extract of the bagasse alkaline pulping method product of one of claim 1～3 and 5～6 described preextraction hemicellulose; It is characterized in that: be the bagasse extract that obtains through step (1) to (3); To removing marrow over dry bagasse; Bagasse organic matter recovery rate is 7～15%, and the bagasse extracting liquid pH value is 4.5～6.9, and component comprises xylo-oligosaccharide, wood sugar, L-arabinose, glucose, lignin, uronic acid and acetate.
8. to the purposes of the described bagasse extract of claim 7 product, it is characterized in that: described bagasse extract is used for the preparation of wood sugar, xylo-oligosaccharide, xylitol, L-arabinose, ethanol or acetate.
9. adopt the prepared bagasse of bagasse alkaline pulping method of one of claim 1～6 described preextraction hemicellulose slightly to starch product; It is characterized in that: for the bagasse that obtains through step (1) to (4) is slightly starched; To the initial marrow over dry bagasse that removes, unscreened yield is 48～57%, thick starch degree KMnO
4Value is 8～14.
10. the purposes of slightly starching product to the described bagasse of claim 9 is characterized in that: the thick slurry of described bagasse is used for the preparation of bleach chemical pulp.
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| CN102585039B (en) * | 2012-02-28 | 2014-11-05 | 昆明理工大学 | Extraction separation method of hemicellulose |
| WO2015072413A1 (en) * | 2013-11-12 | 2015-05-21 | 花王株式会社 | Method for producing xylan-containing composition and method for producing glucan-containing composition |
| CN104672350B (en) * | 2015-02-16 | 2017-07-07 | 广西壮族自治区中国科学院广西植物研究所 | A kind of straw pretreatment method for hemicellulose production |
| CN105113307A (en) * | 2015-07-23 | 2015-12-02 | 华南理工大学 | Pulping method via pre-extraction of bagasse easily soluble hemicelluloses, and product obtained via pulping method |
| CN106638109A (en) * | 2016-12-30 | 2017-05-10 | 芜湖市哈贝纸业有限公司 | Film coatedbasepaper and bagasse pulp for film coatedbasepaper |
| CN108729285B (en) * | 2018-05-08 | 2021-04-09 | 昆明理工大学 | Method for extracting bagasse hemicellulose through microwave-puffing |
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| CN109487610B (en) * | 2018-12-26 | 2021-05-14 | 广西粤桂广业控股股份有限公司 | Method for directly cooking fresh bagasse to prepare pulp |
| CN109837791A (en) * | 2019-03-27 | 2019-06-04 | 北京林业大学 | A kind of bagasse alkaline pulping method based on hydrothermal pretreatment |
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| WO1995008648A1 (en) * | 1993-09-24 | 1995-03-30 | Midwest Research Institute | Prehydrolysis of lignocellulose |
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| US20080142176A1 (en) * | 2006-12-18 | 2008-06-19 | Van Heiningen Adriaan Reinhard | Process of treating a lignocellulosic material |
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|---|---|---|---|---|
| WO1995008648A1 (en) * | 1993-09-24 | 1995-03-30 | Midwest Research Institute | Prehydrolysis of lignocellulose |
| US20080142176A1 (en) * | 2006-12-18 | 2008-06-19 | Van Heiningen Adriaan Reinhard | Process of treating a lignocellulosic material |
| CN101158126A (en) * | 2007-10-27 | 2008-04-09 | 广西大学 | Pulping method for plant fibre raw material combined with biology |
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