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A method for removing inhibitors from dilute acid steamed lignocellulosic materials

A technology of lignocellulose and dilute acid, applied in the direction of fermentation, etc., to achieve efficient removal, high selectivity, and reduce negative effects

Active Publication Date: 2018-04-10
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above method is only used to remove the lignin component, and does not involve the removal of other inhibitors

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Mix 300g of water and 50g of dilute acid steamed and popped corn stalks, put them in an airlift reactor, add 0.2g of H 2 o 2 , the gas is fully back-mixed, the ultrasonic device is started, and the treatment is performed at a frequency of 40kHz and a temperature of 30°C for 20min.

[0030] (2) Step (1) After the treatment, filter and dehydrate, place in an airlift reactor, add 300g of lime milk solution to make the pH 10, feed gas to fully back-mix, and treat for 20 minutes.

[0031] (3) Step (2) After treatment, filter and dehydrate, add 300g of water to the obtained material, put it in an airlift reactor, add 0.2gH 2 o 2 , pass the gas to fully back-mix, start the ultrasonic device, and process at a frequency of 60kHz for 30min.

[0032] (4) After the treatment in step (2), the pH of the material is adjusted to 5.5 with sulfuric acid, and the detoxified material is obtained by filtration and dehydration.

[0033] Carry out enzymatic hydrolysis in a conventiona...

Embodiment 2

[0035] (1) Mix 300g of water with 50g of dilute acid steamed and popped corn stalks, and place them in the inner cylinder of the air-lift reactor. The upper and lower ends of the inner cylinder of the air-lift reactor are equipped with wire mesh. Add 1g columnar activated carbon to the outer cylinder, add 0.2gH 2 o 2 , the gas is fully back-mixed, the ultrasonic device is started, and the frequency is 40kHz, and the temperature is 30°C for 20min.

[0036] (2) Step (1) After the treatment, filter and dehydrate, place in an airlift reactor, add 300g of lime milk solution to make the pH 10, feed gas to fully back-mix, and treat for 20 minutes.

[0037] (3) Step (2) After treatment, filter and dehydrate, add 300g of water to the obtained material, put it in an airlift reactor, add 0.2gH 2 o 2 , start the ultrasonic device, and process for 30min at a frequency of 60kHz.

[0038] (4) After the treatment in step (2), the pH of the material is adjusted to 5.5 with sulfuric acid, ...

Embodiment 3

[0041] (1) Mix 300g of water with 100g of dilute acid steamed and popped corn stalks, and place them in the inner cylinder of the air-lift reactor. The upper and lower ends of the inner cylinder of the air-lift reactor are equipped with wire mesh. Add 1g columnar activated carbon to the outer cylinder, add 0.4gH 2 o 2 , start the ultrasonic device, at a frequency of 60kHz, pass in the gas to fully back-mix, and process at a temperature of 30°C for 30min.

[0042] (2) Step (1) After treatment, filter and dehydrate, place in an airlift reactor, add 300g of milk of lime solution to make the pH 8, pass in gas to fully back-mix, and treat for 30 minutes.

[0043] (3) Step (2) After treatment, filter and dehydrate, add 300g of water to the obtained material, put it in the inner cylinder of the airlift reactor, add 0.4gH 2 o 2 , start the ultrasonic device, and process for 30min at a frequency of 80kHz.

[0044] (4) After the treatment in step (2), the pH of the material is adju...

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Abstract

The invention provides a method for removing inhibitors from dilute acid steamed lignocellulosic materials, comprising: (1) placing a mixture of dilute acid steamed lignocellulosic materials and water in an airlift reactor , add H2O2, start the reactor for ultrasonic treatment; (2) filter and dehydrate the mixed material liquid in step (1), add lime milk to adjust the pH value to 7‑10, and start the airlift reactor for treatment; (3) process the step ( 2) The mixed material liquid is filtered and dehydrated, and the treatment process of step (1) is repeated; (4) The pH of the mixed material liquid in step (3) is adjusted to 5-7, and the detoxified material obtained by filtering and dehydrating is subjected to enzymatic hydrolysis. The method adopts ultrasonic wave and H2O2 to detoxify dilute acid steamed lignocellulosic materials in an air-lift reactor, the detoxification efficiency is high, and the negative influence of inhibitors on enzymolysis and fermentation is reduced; at the same time, the present invention has the advantages of Higher selectivity, low loss rate of reducing sugar during treatment.

Description

technical field [0001] The invention belongs to the field of biochemical industry, and in particular relates to a 2 o 2 The method for removing inhibitors from dilute acid steam-exploded lignocellulosic materials is mainly used for the detoxification of corn stalks, wheat stalks, sweet sorghum stalks and other plant straws pretreated by dilute acid steam-explosion. Background technique [0002] During the pretreatment process, due to the degradation of sugars and lignin, some inhibitors of microbial growth will be released, including weak acid inhibitors (formic acid, acetic acid, levulinic acid, etc.), furfural inhibitors (furfural, 5-hydroxymethyl furfural) and phenolic inhibitors (vanillin, hydroquinone, 4-hydroxybenzoic acid) and other substances. These inhibitors, especially phenols, have obvious inhibitory effects on subsequent enzymatic hydrolysis and microbial fermentation, reducing product yield, so necessary detoxification treatment should be carried out before f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12P19/14
Inventor 唐开宇张全
Owner CHINA PETROLEUM & CHEM CORP
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