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Method for separating cellulose, hemicellulose and lignin in cotton stalk

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

Active Publication Date: 2019-05-31
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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  • Method for separating cellulose, hemicellulose and lignin in cotton stalk

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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

[0040] The method for separating and fully utilizing cellulose, hemicellulose and lignin in cotton stalks comprises the following steps:

[0041] (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.

[0042] (2) Squeeze dry: dehydrate the material after soaking in the continuous prepreg machine to make the water content 40%;

[0043] (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.

[0044] (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 ...

Embodiment 3

[0051] The method for separating and fully utilizing cellulose, hemicellulose and lignin in cotton stalks comprises the following steps:

[0052] (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.

[0053] (2) Squeeze dry: dehydrate the material after soaking in the continuous prepreg machine to make the water content 40%;

[0054] (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.

[0055] (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 full-mass utilization of cotton stalks, in particular to a method for separating cellulose, hemicellulose and lignin in a cotton stalk. The method comprises the following steps that 1) pretreatment is carried out; 2) dry squeezing is carried out; 3) steam explosion is carried out; 4) washing is carried out to extract xylose; 5) dehydrated solid matter is hydrolyzed in the presence of sulfuric acid to obtain a xylose hydrolysate; 6) the xylose hydrolysate and washing water are subjected to sulfuric acid recovery through a bipolar membrane, and arethen mixed with a washing liquid to recycle the xylose; 7) filter pressing is carried out to obtain a filtrate, the filtrate is lignin potassium, and a solid material is washed to be neutral and directly used for papermaking; 8) a filter pressing liquid and the washing water of the solid material are subjected to reverse osmosis membrane concentration and spray drying to prepare a compound fertilizer. The method has the advantages that the method is simple, the operability is strong, and the separation and full-mass utilization of the cellulose, hemicellulose and lignin in the cotton stalk can be achieved better.

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-we...

Claims

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Application Information

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Patent Type & Authority Applications(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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