Method for preparation of lignosulfonate and cogeneration of microcrystalline cellulose from corn cob residues

A technology of lignosulfonate and microcrystalline cellulose, which is applied in cellulose raw material pulping, cellulose pulp post-processing, fiber raw material processing and other directions, can solve the problems of low purity and complex preparation process of lignosulfonate. , to achieve the effect of simple production process, low resource utilization, and changing the scope of application

Active Publication Date: 2015-05-27
FUTASTE PHARM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a method for preparing lignosulfonate co-productio

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) Desanding: Xylose residues are desanded through cleaning separator, high-concentration desander, separation desander, dredging desander, and then dehydrated to about 50% by filter press dehydrator and screw squeezer. It is then crushed by a crusher for use.

[0038] (2) Sulfonation: Put the crushed xylose residue obtained in step (1) into a steaming ball, add sulfonating agent and a small amount of cooking aid anthraquinone, add water to adjust the solid-liquid ratio to 1:4, and the sulfonation temperature 130°C, time 240min. The sulfonating agent is a mixture of sodium hydroxide and sodium sulfite with a mass ratio of 13:7, the dosage of the sulfonating agent is 15% of the mass of the absolute dry xylose residue, and the amount of the cooking aid is 0.3% (mass ratio, for absolute dry xylose residue ), sulfonation degree>1.2mmol / g (determination of sulfonation degree of finished lignosulfonate by ion exchange-conductometric titration method).

[0039] (3) Solid-li...

Embodiment 2

[0046] (1) Desanding: Xylose residues are desanded by cleaning separator, high concentration desander, separation desander, desandering desander, and then dehydrated to about 50% by filter press dehydrator and screw squeezer. It is then crushed by a crusher for use.

[0047] (2) Sulfonation: Put the crushed xylose residue obtained in step (1) into a steaming ball, add sulfonation agent and a small amount of cooking aid green oxygen, add water to adjust the solid-liquid ratio to 1: 10, and the sulfonation temperature 165°C, time 60min. The sulfonating agent is a mixture of potassium hydroxide and sodium bisulfite, the mass ratio is 1:0.3, the amount of sulfonating agent is 20% of the mass of dry xylose residue, and the amount of cooking aid is 1% (mass ratio, vs. Dry xylose residue), sulfonation degree > 1.2mmol / g (determination of sulfonation degree of finished lignosulfonate by ion exchange-conductometric titration method).

[0048] (3) Solid-liquid separation and washing:...

Embodiment 3

[0055] (1) Desanding: The xylose residue is desanded through the cleaning separator, high-concentration desander, separation desander, and dredging desander, and then dehydrated to about 70% by the filter press dehydrator and the screw squeezer. It is then crushed by a crusher for use.

[0056] (2) Sulfonation: put the desanded xylose residue obtained in step (1) into a steaming ball, add sulfonating agent and a small amount of cooking aid tetrahydroanthraquinone, add water to adjust the solid-to-liquid ratio to 1:8, The sulfonation temperature is 140°C, and the time is 60-240min. The sulfonating agent is a mixture of calcium hydroxide and calcium sulfite with a mass ratio of 1:0.8, the amount of sulfonating agent is 20% of the mass of dry xylose residue, and the amount of cooking aid is 0.8% (mass ratio, for dry wood sugar residue), the sulfonation degree>1.2mmol / g (the sulfonation degree of the finished lignosulfonate was determined by ion exchange-conductometric titration ...

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Abstract

The invention provides a method for preparation of lignosulfonate and cogeneration of microcrystalline cellulose from corn cob residues. The method mainly comprises the following steps: pretreating corn cob residues, and sulfonating, filtering and washing to obtain a black liquid and residues; further filtering the black liquid, carrying out ultra-filtration, and recycling an ultrafiltration permeate liquid, namely a lignosulfonate solution; concentrating and drying to obtain lignosulfonate; and bleaching, washing, dewatering, drying, crushing and screening the obtained residues to obtain microcrystalline cellulose, wherein the purity of the obtained lignosulfonate is greater than or equal to 90%. Meanwhile, the microcrystalline cellulose can be prepared. The production technology is simple; the problem of low resource utilization rate in corn cob industry at present is solved; after comprehensive utilization and development of resources in the industry of extracting xylose from corn cob, the application range of the corn cob is changed, the economic value of the corn cob is improved, lignin derivative products, cellulose products and the like are extended, and single xylose production is changed into diversified production.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to a method for preparing lignosulfonate from xylose residue and co-producing microcrystalline cellulose. Background technique [0002] Lignosulfonate, also known as sulfonated lignin, is a by-product of sulfite papermaking wood pulp. It is prepared by precipitation, separation, drying and other processes with precipitants such as lime, calcium chloride, and basic lead acetate. This kind of process is complicated, and the purity of the obtained lignosulfonate is relatively low. [0003] Microcrystalline cellulose (Microcrystalline celulose, MCC) is a linear polysaccharide bound by β-1,4 glucosidic bonds. Or near white powdery solid product. The traditional preparation of microcrystalline cellulose mainly uses natural fibers with high α-cellulose such as rice husk, beet pulp, bagasse, corn cob, wheat, barley, straw, reed stalk, peanut shell, loofah, Indian bamboo, etc. ...

Claims

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Application Information

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IPC IPC(8): D21C3/02D21C3/22C08H7/00
CPCC08H6/00D21C3/02D21C3/222D21C9/163D21C9/18
Inventor 李林杜瑞锋王成福孙鲁张亮邱学良黄伟红曹玉华
Owner FUTASTE PHARM CO LTD
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