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Separation method of cellulose, hemicellulose and lignin in cotton stalks

A technology of hemicellulose and separation method, which is applied in the separation of raw materials, non-woody plant/crop pulp, pulp dehydration, etc., can solve the problems of long production cycle, unfavorable industrial production, etc., and achieves high conversion rate, safe operation, and technology. simple effect

Active Publication Date: 2022-01-07
SICHUAN GOLDEN ELEPHANT SINCERITY CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method has a long production cycle and does not utilize industrialized production

Method used

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  • Separation method of cellulose, hemicellulose and lignin in cotton stalks

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Experimental program
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Effect test

Embodiment 1

[0029] The method for separating and fully utilizing cellulose, hemicellulose and lignin in cotton stalks comprises the following steps:

[0030] (1) Pretreatment: After the collected cotton stalks are separated, they are cut into lengths of 8-12cm. After screening, they enter a continuous presoaker for presoaking with an aqueous solution containing dilute sulfuric acid with a mass concentration of 0.4%. The ratio is 1:6. The presoaking temperature is normal temperature and the time is 6h.

[0031] (2) Squeeze dry: dehydrate the material after soaking in the continuous prepreg machine to make the water content 40%;

[0032] (3) Steam explosion treatment: Put the dehydrated cotton stalks into the steam explosion device for steam explosion treatment; when steam explosion treatment, first pressurize with steam to 2.0MPa, then pressurize with compressed air to 3.5MPa, and keep for 120s , to achieve instant explosion.

[0033] (4) Water washing to extract xylose: extract xylose ...

Embodiment 2

[0041] The method for separating and fully utilizing cellulose, hemicellulose and lignin in cotton stalks comprises the following steps:

[0042] (1) Pretreatment: After the collected cotton stalks are separated, they are cut into lengths of 8-12cm. After screening, they are put into a continuous presoaker and presoaked with an aqueous solution containing 0.4%% dilute sulfuric acid. The solid-to-liquid ratio is 1: 6.

[0043] (2) Squeeze dry: dehydrate the material after soaking in the continuous prepreg machine to make the water content 40%;

[0044] (3) Steam explosion treatment: Put the dehydrated cotton stalks into the steam explosion device for steam explosion treatment; when steam explosion treatment, first pressurize with steam to 2.0MPa, then pressurize with compressed air to 3.5MPa, and keep for 120s , burst instantly.

[0045] (4) Water washing to extract xylose: extract xylose from the material after gas explosion, the mass ratio of material to water is 1:10, the ex...

Embodiment 3

[0053] The method for separating and fully utilizing cellulose, hemicellulose and lignin in cotton stalks comprises the following steps:

[0054] (1) Pretreatment: After the collected cotton stalks are separated, they are cut into lengths of 8-12cm. After screening, they are put into a continuous presoaker and presoaked with an aqueous solution containing 0.4%% dilute sulfuric acid. The solid-to-liquid ratio is 1: 6.

[0055] (2) Squeeze dry: dehydrate the material after soaking in the continuous prepreg machine to make the water content 40%;

[0056] (3) Steam explosion treatment: Put the dehydrated cotton stalks into the steam explosion device for steam explosion treatment; during steam explosion treatment, first pressurize to 2.0MPa with steam, then pressurize to 5MPa with compressed air, and keep it for 120s. It exploded instantly.

[0057] (4) Water washing to extract xylose: extract xylose from the material after gas explosion, the mass ratio of material to water is 1:...

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Abstract

The invention relates to the technical field of cotton stalk utilization technology, in particular to a method for separating cellulose, hemicellulose and lignin in cotton stalks. The method comprises the following steps: 1) pretreatment; 2) squeezing dry; 3) steam explosion treatment; 4) washing with water to extract xylose; 5) hydrolyzing the dehydrated solid in the presence of sulfuric acid to obtain a xylose hydrolyzate; 6 ) After the xylose hydrolyzate and washing water pass through the bipolar membrane to recover sulfuric acid, they are combined with the washing solution to recover xylose. In addition, it also includes 7) press filtration, the filtrate obtained is lignin potassium, and the solid material is washed until neutral and used directly for papermaking; 8) the press filter liquid and the washing water of the solid material are concentrated by reverse osmosis membrane and spray-dried to prepare compound fertilizer . The method is simple and has strong operability, and can better realize the separation and complete utilization of cellulose, hemicellulose and lignin in the cotton stalks.

Description

technical field [0001] The invention relates to the technical field of cotton stalk utilization technology, in particular to a method for separating cellulose, hemicellulose and lignin from cotton stalks and a method for utilizing the whole substance. Background technique [0002] Cotton is one of the important economic crops in China, and a large amount of by-products are produced during the cotton harvest. As the main by-product of cotton production, cotton stalks are mostly used as living fuels, and the comprehensive utilization of cotton stalks is seldom. The woody part of the cotton stalk contains 74% cellulose, 21% lignin, 18.8% pentose, 43.7% cellulose, and the rest is water and impurities. [0003] Hemicelluloses are complex components in the cell walls of cotton stalks. They are linked to cellulose by hydrogen bonds, to lignin by covalent bonds (mainly ∝-benzyl ether bonds), and to acetyl units and hydroxycinnamic acids by ester bonds. They are low-molecular-weig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H11/12D21B1/36D21C9/18
Inventor 唐印郭志刚雷林刘朝慧李旭初李刚王明权
Owner SICHUAN GOLDEN ELEPHANT SINCERITY CHEM CO LTD
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