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Technology for extracting cellulose from biomass raw materials

A biomass raw material, cellulose technology, applied in the direction of acid acid/anhydride pulping, pulp bleaching, etc., can solve problems such as inapplicability, and achieve the effects of reduced damage, high purity, and shortened cooking time

Active Publication Date: 2014-07-02
JINAN SHENGQUAN GROUP SHARE HLDG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this patent, when formic acid is used to cook herbs and broad-leaved trees to produce pulp, acetic acid is added as an additional cooking chemical to obtain pulp. This method is mainly used to prepare pulp, and the purpose is to retain cellulose and part of hemicellulose to the greatest extent. The entire process is designed for this purpose, so the process is not suitable for processes with cellulose as the extraction product

Method used

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  • Technology for extracting cellulose from biomass raw materials
  • Technology for extracting cellulose from biomass raw materials
  • Technology for extracting cellulose from biomass raw materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] In this embodiment, the reeds are first crushed to a particle size of 2 cm to 10 cm.

[0052] The present embodiment extracts the technology of cellulose from described reed, comprises the steps:

[0053] (1) After the reeds were crushed and pretreated, the treated reeds were cooked using an organic acid solution with a total acid concentration of 70wt% formic acid and acetic acid. The mass ratio of acetic acid to formic acid in the organic acid solution in this embodiment was 1: 1, and before adding the reed raw material, add hydrogen peroxide (H 2 o 2 ) as a catalyst, control the reaction temperature at 125°C, react for 40 minutes, and have a solid-liquid mass ratio of 1:5, and conduct the first solid-liquid separation of the obtained reaction liquid;

[0054] (2) Add the solid obtained from the first solid-liquid separation to an organic acid solution with a total acid concentration of 70wt% formic acid and acetic acid for acid washing, wherein the organic acid sol...

Embodiment 2

[0065] In this embodiment, firstly, the rice straw is crushed to a particle size of 3 cm to 5 cm.

[0066] The present embodiment extracts the technology of cellulose from described rice straw, comprises the steps:

[0067] (1) After the rice straw is crushed and pretreated, the treated rice straw is cooked with an organic acid solution with a total acid concentration of 90wt% formic acid and acetic acid. The mass ratio of acetic acid to formic acid in the organic acid solution of this embodiment is 1: 8, and before adding the straw raw material, add hydrogen peroxide (H 2 o 2 ) as a catalyst, control the reaction temperature at 145°C, react for 20 minutes, the solid-liquid mass ratio is 1:8, and conduct the first solid-liquid separation of the obtained reaction liquid;

[0068] (2) The solid obtained from the first solid-liquid separation is added to an organic acid solution with a total acid concentration of 90wt% formic acid and acetic acid for acid washing, wherein the o...

Embodiment 3

[0079] In the present embodiment, firstly, the bamboo slices are crushed into flakes with a length of 2-10 cm and a thickness of 2 mm.

[0080] The present embodiment extracts the technology of cellulose from described bamboo chip, comprises the steps:

[0081] (1) After the bamboo slices are pulverized and pretreated, the treated bamboo slices are cooked with an organic acid solution of formic acid and acetic acid with a total acid concentration of 95 wt%. The mass ratio of acetic acid to formic acid in the organic acid solution of this embodiment is 1:6, and add hydrogen peroxide (H 2 o 2 ) as a catalyst, control the reaction temperature at 135°C, react for 60 minutes, and have a solid-liquid mass ratio of 1:6, and conduct the first solid-liquid separation of the obtained reaction liquid;

[0082] (2) The solid obtained from the first solid-liquid separation is added to an organic acid solution with a total acid concentration of 95wt% formic acid and acetic acid for acid w...

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Abstract

The invention relates to a cellulose extracting technology, and specifically relates to a technology that utilizes organic acids to extract cellulose from biomass raw materials in the presence of a hydrogen peroxide catalyst. The technology comprises the following steps: in the presence of a hydrogen peroxide catalyst, utilizing an organic acid to cook biomass raw materials, wherein the organic acid is composed of formic acid with a concentration of 70 to 95 wt% and acetic acid with a concentration of 70 to 95 wt%; extracting and screening so as to obtain screened cellulose pulp; and further bleaching the screened pulp so as to obtain the target cellulose; wherein the cellulose is dissolving pulp or industrial cellulose. The alpha-cellulose content of the cellulose obtained by the method provided by the invention is more than 90 wt%. The technology has the advantages of simple route and low energy consumption.

Description

technical field [0001] The invention relates to a cellulose extraction process, in particular to a process for extracting cellulose from biomass raw materials by using organic acids. Background technique [0002] The main components of biomass raw materials are cellulose, hemicellulose and lignin. Among them, cellulose accounts for about 40%, hemicellulose accounts for about 25%, and lignin accounts for about 20%. The biomass produced by photosynthesis on the earth every year The total amount of raw materials exceeds 200 billion tons, so biomass is the most abundant and cheapest renewable resource on earth. [0003] Cellulose is the main component of plant cell walls. The cellulose used for textile and papermaking in the world reaches 8 million tons per year. In addition, using separated and purified cellulose as raw material, rayon, cellophane, nitrate, acetate and other ester derivatives and ethers such as methyl cellulose, ethyl cellulose and sodium carboxymethyl cellul...

Claims

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Application Information

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IPC IPC(8): D21C3/04D21C9/16
Inventor 唐一林江成真高绍丰刘洁孙智华
Owner JINAN SHENGQUAN GROUP SHARE HLDG
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