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Method for preparing dihydric alcohol from crop straw

A technology for crop straw and glycol, applied in chemical recovery, fermentation and other directions, can solve problems affecting product production, etc., and achieve the effects of low production cost and unique and novel process

Inactive Publication Date: 2014-03-26
郸城财鑫糖业有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the intensification of the oil energy crisis, the price of diols in the international market has risen rapidly in recent years, which has seriously affected the production of subsequent products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The catalyst of the present invention is nickel-aluminum-molybdenum-iron / tin / copper / zinc / antimony, and the hydrogen is 99.99% hydrogen obtained by purifying water gas through pressure swing adsorption.

[0024] A method for preparing glycol from crop stalks of the present invention comprises the following steps:

[0025] (1) Straw pretreatment

[0026] Crush a certain amount of corn stalks to a size of 5-10mm, after drying, sieve and cyclone to remove impurities such as sand and soil, weigh 21Kg of dust-removed and crushed straw (moisture 10%), add 5% according to the solid-liquid ratio of 1:1 Dilute sulfuric acid solution, after stirring and mixing in the dipping tank, pre-soak for 12-16 hours for use. Put the pre-impregnated material into the pretreatment reactor, tighten the flange, and after making sure the reactor is completely sealed, slowly introduce high-temperature water vapor (2-3MPa). When the reaction temperature reaches 190°C, according to the pressure gau...

Embodiment 2

[0036] The catalyst of the present invention is nickel-aluminum-molybdenum-iron / tin / copper / zinc / antimony, and the hydrogen is 99.99% hydrogen obtained by purifying water gas through pressure swing adsorption.

[0037] A method for preparing glycol from crop stalks of the present invention comprises the following steps:

[0038] (1) Straw pretreatment

[0039]Crush a certain amount of corn stalks to a size of 5-10mm, after drying, sieve and cyclone to remove impurities such as sand and soil, weigh 120Kg of dust-removed and crushed straw (water 10%), add 3% according to the solid-liquid ratio of 1:1 Dilute sulfuric acid solution, after stirring and mixing in the dipping tank, pre-soak for 12-16 hours for use. Put the pre-impregnated material into the pretreatment reactor, tighten the flange, and make sure the reactor is completely sealed, then slowly introduce high-temperature water vapor (2-3MPa), when the reaction temperature reaches 200°C, according to the pressure gauge An...

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Abstract

The invention discloses a method for preparing dihydric alcohol from crop straw. The method comprises steps of steeping raw material crop straw into diluted acid, pretreating for a short time at high temperature, then carrying out refining treatments such as cellulose hydrolyzing, decoloring and filtering, ion exchanging and high efficiently concentrating, so as to prepare straw sugar, in the presence of a special nickel alloy catalyst, continuously hydrocracking the straw sugar under high pressure so as to obtain a mixture of dihydric alcohol and polyhydric alcohols, rectifying the split product at reduced pressure and separating so as to obtain products such as ethylene glycol and propylene glycol. The method has the advantage of unique and novel and advance process; non-grain biomass resource is taken as the raw material, so that the grain risk is thoroughly avoided; the non-grain biomass resource can substitute for non-renewable resources such as petroleum or coal, so that the method has significance to development of circular economy.

Description

technical field [0001] The invention relates to a method for preparing dihydric alcohol from crop stalks. Background technique [0002] Ethylene glycol, propylene glycol and various butanediols are indispensable basic raw materials in chemical production. They are widely used in chemical industry, medicine, textile, polymer materials and other fields. The import volume of alcohol is about 6.8 million tons, and the annual demand for propylene glycol is about 360,000 tons, so there is a huge gap in the domestic market. [0003] At present, the production of diols in industry mainly uses petroleum raw materials, and ethylene or propylene is used as a raw material to produce ethylene glycol and propylene glycol through epoxidation. However, with the intensification of the oil energy crisis, the price of diols in the international market has risen rapidly in recent years, which has seriously affected the production of subsequent products. Based on factors such as the current oi...

Claims

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Application Information

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IPC IPC(8): C12P7/18
CPCY02P20/584
Inventor 仵树仁王晓飞陆启明李锦王念祥史昊闫锁袁淏张兵团巴向阳陈世鑫罗文杰王禄明
Owner 郸城财鑫糖业有限责任公司
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