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Corn straw dilute acid pretreatment method for reducing corrosion degree of reactor

A corn stalk and pretreatment technology, applied in fermentation and other directions, can solve problems such as corrosion and heavy sewage treatment burden, and achieve the effects of reducing corrosion, reducing equipment investment, and improving service life

Pending Publication Date: 2018-05-22
SHANXI SYNTHETIC BIOLOGY INST CO LTD
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  • Description
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Problems solved by technology

However, in the conventional dilute acid pretreatment process, the amount of dilute acid is usually as high as 6-10 times that of the lignocellulosic raw material, and the free acid liquid will seriously corrode the material of the reactor during the high temperature pretreatment process, which greatly improves the Equipment investment; at the same time, a large amount of acidic pretreatment wastewater is produced, resulting in a heavy sewage treatment burden

Method used

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  • Corn straw dilute acid pretreatment method for reducing corrosion degree of reactor

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Effect test

Embodiment 1

[0019] Mix 10 g of dilute sulfuric acid solution (the mass fraction of sulfuric acid is 0.25%) with 1 g of dry corn stalks (liquid-solid ratio is 10:1) after dedusting coarse powder, and then put them into a cylindrical reactor processed by 304 stainless steel. The dosage is 25mg / g dry corn stover. After sealing, place it in a muffle furnace for high-temperature pretreatment reaction, the reaction condition is 175°C, keep it for 12 hours after the temperature rises to 175°C, take out the pretreatment slurry from the steel pipe without washing, repeat the above process, and the number of cycles is 26 times . The pretreatment slurry obtained each time is suction-filtered, and the liquid part is measured with a phenanthroline spectrophotometer for iron ion concentration and the results of 26 times are accumulated, and the iron ion concentration produced is 8.17mg / g dry solid. Under the above pretreatment conditions, the retention time was adjusted to 90 minutes, and the enzymati...

Embodiment 2

[0021] 0.5g of dilute sulfuric acid solution (the mass fraction of sulfuric acid is 5%) and 1g of dry corn stalks after dedusting coarse powder (liquid-solid ratio is 0.5:1) are mixed evenly and loaded into a cylindrical reactor processed by 304 stainless steel. The dosage of sulfuric acid is 25mg / g dry corn stover. After sealing, put it in a muffle furnace for high-temperature pretreatment reaction. The reaction condition is 175°C. After the temperature rises to 175°C, keep it for 12 hours. Take out the pretreated material from the steel pipe and do not wash it. Repeat the above process, and the number of cycles is 26 times. . The pretreatment material obtained each time is suction filtered after being diluted, and the liquid part is measured by the phenanthroline spectrophotometer for iron ion concentration and the results of 26 times are accumulated, and the iron ion concentration produced is 3.95mg / g dry solid. Under the above pretreatment conditions, the retention time w...

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Abstract

The invention discloses a corn straw dilute acid pretreatment method for reducing the corrosion degree of a reactor. The preparation method comprises the concrete steps: (1) mixing dilute sulfuric acid with corn straw after dedusting and smashing in a low liquid-solid ratio evenly, making the dilute sulfuric acid solution completely absorbed by the corn straw and making no free dilute acid exist;(2) adding the corn straw of the step (1) into a pretreatment reactor with a built-in stirring device, and pretreating; and (3) using the pre-treated corn straw obtained by the step (2) in a subsequent biological processing process. The pretreatment method has the advantages that the dilute acid pretreatment process with low liquid-solid ratio (the mass ratio of the dilute sulfuric acid solution to the corn straw solid) achieves good pretreatment effect, meanwhile, the corrosion to a reactor material in the pretreatment process is greatly reduced by the absence of a free acidic solution, the service life of the reactor is prolonged and the economy of the biorefinery process is improved.

Description

【Technical field】 [0001] The invention relates to the field of lignocellulose biorefining, and relates to a dilute acid pretreatment method for corn stalks that reduces the corrosion degree of a reactor. 【Background technique】 [0002] The structure of lignocellulosic raw materials is complex, and hemicellulose and lignin are covalently linked to form a network structure, which tightly wraps cellulose, making it very difficult to directly enzymatically hydrolyze or biotransform it. Therefore, it is necessary to destroy the lignocellulose structure by physical, chemical, physicochemical or biological methods, so that the subsequent enzymatic hydrolysis and fermentation process can be carried out more easily. This process is the pretreatment process of lignocellulose raw materials. [0003] Dilute acid pretreatment is one of the most mainstream pretreatment methods at present. This process uses dilute acid as a catalyst to degrade hemicellulose into xylose and other monosacch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P19/14C12P19/02
CPCC12P19/02C12P19/14C12P2201/00
Inventor 鲍杰邵帅张建
Owner SHANXI SYNTHETIC BIOLOGY INST CO LTD
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