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Process for fractionating sugarcane bagasse into high a-cellulose pulp, xylan and lignin

A technology for cellulose pulp, classification and separation, used in pulp bleaching, non-woody plant/crop pulp, water/steam pretreatment, etc.

Active Publication Date: 2010-09-01
COUNCIL OF SCI & IND RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This patent does not appear to isolate pure cellulose for value-added cellulose esters and ethers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] Bagasse (200 g) containing 5% pith was saturated with water and placed in a laboratory steam explosion reactor with a volume of 10 liters. The steam from has 35Kg / cm 2 The vapor pressure of the evaporator is discharged into this reactor so that the reactor vapor pressure is 11Kg / cm 2 , and the temperature is 180°C. The vapor pressure in the reactor was maintained for 15 minutes, immediately after which the contents of the reactor were released to the atmosphere, causing the bagasse to "explode" into particles. 40 grams of hemicellulose (xylan) were removed by this treatment and a solid form was obtained by evaporating water. After treatment with hot water at 140° C. for 4 hours, a further 14 g of hemicellulose could be removed (thus a total hemicellulose yield of 27% (w / w)). The obtained hemicellulose was hydrolyzed approximately 50% into monmeric xylose, arabinose, glucose and a fourth sugar not identified by high performance ion chromatography, while the remaining ...

Embodiment 2

[0067] Bagasse (200 g) containing 5% pith was placed in a laboratory model steam explosion reactor with a volume of 10 liters. The steam from has 35Kg / cm 2 The vapor pressure of the evaporator is discharged into this reactor so that the reactor vapor pressure is 9Kg / cm 2, and the temperature is 170°C. The vapor pressure in the reactor was maintained for 30 minutes, immediately after which the contents of the reactor were released to the atmosphere, causing the bagasse to "explode" into particles. 29.3 grams of hemicellulose (xylan) were removed by this treatment and a solid form was obtained by evaporating water. After treatment with hot water at 140°C for 4 hours, a further 14.6 g of hemicellulose could be removed. A 15 gram sample of steam explosion material was extracted with 20 grams (w / w) of sodium hydroxide in 200 mL of water in a 300 mL Parr reactor. Rinse the residue well with distilled water. The lignin-containing filtrate was precipitated with concentrated hydro...

Embodiment 3

[0069] Bagasse (100 g) containing 35% pith was saturated with water and placed in a laboratory steam explosion reactor with a volume of 10 liters. The steam from has 35Kg / cm 2 The vapor pressure of the evaporator is discharged into this reactor so that the reactor vapor pressure is 28Kg / cm 2 , and the temperature is 230°C. The vapor pressure in the reactor was maintained for 5 minutes, after which the contents of the reactor were immediately released to the atmosphere, causing the bagasse to "explode" into a tiny paste-like material. 19 grams of hemicellulose (xylan) were removed by this treatment and a solid form was obtained by evaporating water. After treatment with hot water at 140°C for 4 hours, a further 3 g of hemicellulose could be removed. A sample of steam explosion material was extracted with 20 grams (w / w) of sodium hydroxide in 200 mL of water in a 300 mL Parr reactor. Rinse the residue well with distilled water. The lignin-containing filtrate was precipitate...

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Abstract

Sugarcane bagasse consists of mainly three polymeric components, namely cellulose (40-45%), hemicellulose (xylan) (28-30%), and lignin (19-21%). A process is herein disclosed for fractionating sugarcane bagasse into cellulose, hemicellulose and lignin with high purity a-cellulose, which is a useful raw material for preparing cellulose esters like cellulose triacetate and other high value-added cellulose plastics. Co-production and recovery of hemicellulose (xylan) and lignin in high yields and high purities, along with a-cellulose, is another important feature of this process. Sugarcane bagasse consists of a material known as pith which constitutes 30-35% by weight of bagasse. Pith contains cellulose, hemicellulose, and lignin, in addition to various other ingredients and cell mass. The process described herein discloses the use of partially depithed bagasse as a preferred raw material for fractionation. Use of sugarcane bagasse containing pith leads to a product which is lower in yield as well as poorer in color.

Description

field of invention [0001] The present invention relates to a method for fractionating bagasse to high alpha-cellulose, xylan and lignin. The separated components are used to produce high value-added commodities such as cellulose esters, pentose sugars and their derived materials, as well as lignosulfonates and other lignin derivatives. Background of the invention [0002] Depletion of forest vegetation and environmental pollution are two major concerns of human beings today. Therefore, there is a strong impetus to develop technologies to prevent deforestation and to develop "green technologies" that reduce the amount of chemicals used in the process. For example, the use of steam for hydrolysis reactions is preferred over the use of chemicals for the same purpose. [0003] Agricultural waste, such as bagasse, grain and cereal straw, jute stalks, cotton stalks, etc., is a fibrous cellulose material composed of cellulose, hemicellulose and lignin in almost the same proportio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08H5/04C08H8/00
CPCD21C1/02C08B37/0003D21H11/12D21C1/08D21C9/14C08B37/0057C08H8/00
Inventor A·J·瓦尔玛
Owner COUNCIL OF SCI & IND RES
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