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Method for preparing dihydric alcohol from lignocellulosic biomass

A technology for wood fiber and biomass, which is applied in the chemical industry, can solve the problems of difficulty in industrialization, high energy consumption for separation, high price, etc., and achieves the effects of improving stability, good selectivity and high conversion rate.

Active Publication Date: 2011-12-21
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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Problems solved by technology

These methods all directly use pure cellulose as the reaction raw material, but because pure cellulose needs to be extracted from natural wood cellulose, the cost is high, the price is expensive, and it is limited by the mass transfer of solid-solid reaction, a large amount of water is required as the medium Auxiliary reaction, the solid-liquid ratio is generally lower than 1:20, and the product diol concentration is not more than 5%. The subsequent separation consumes a lot of energy and is difficult to realize industrialization

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  • Method for preparing dihydric alcohol from lignocellulosic biomass
  • Method for preparing dihydric alcohol from lignocellulosic biomass
  • Method for preparing dihydric alcohol from lignocellulosic biomass

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preparation example Construction

[0035] The present invention uses lignocellulosic biomass as the preparation method of the mixed glycol of raw material, comprises the following steps:

[0036](1) Lignocellulosic biomass pretreatment-enzymatic saccharification: The lignocellulosic biomass here includes agricultural and forestry residues or wastes such as agricultural straw, wood chips, and wood chips. Lignocellulosic biomass is preliminarily crushed to less than 5 cm, mixed with 0.5-10% alkali solution or 0-10% acid solution or other suitable pretreatment chemical reagents, and pretreated at 50-300 ° C for 0.5 -20 hours, destroy the crystalline structure in the lignocellulosic biomass, then wash the pretreated raw material and transfer it to an enzymatic hydrolysis tank, and then separate the solid and liquid after being hydrolyzed by cellulase to obtain a soluble carbohydrate solution, which mainly contains Glucose, xylose, arabinose and other monosaccharides, soluble oligosaccharides, and a very small amoun...

Embodiment 1

[0048] Crush 100kg of straw (raw material from Jiaonan, Qingdao) to less than 5cm, add 1% NaOH solution, solid-to-liquid ratio 1:2, and treat at 105°C for 3 hours. Depending on the enzymatic hydrolysis conditions, the components of the crude sugar solution mainly contain glucose, xylose, arabinose, xylan, cellobiose, trisaccharide and other soluble oligosaccharides and sugar degradation products, such as furfural and 5-hydroxymethylfurfural Wait. The enzymatic hydrolysis mixed sugar solution is decolorized by activated carbon, and then concentrated after ion exchange, so that the sugar concentration in the solution reaches 10-50 wt%, that is, the hydrogenolysis raw material solution for preparing diol is obtained. The evaluation of the hydrogenolysis reaction of the sugar solution was carried out in a batch type autoclave. Transfer 5L of 20wt% mixed sugar solution into a 10L stainless steel autoclave, adjust the pH of the solution to 13-14 with NaOH, and add 10% of the substra...

Embodiment 2

[0055] The specific implementation process is the same as in Example 1, except that the alkali concentration in the pretreatment stage is 2%, the temperature in the pretreatment section is 100°C, and the enzymatic hydrolysis yields of glucose, xylose, and arabinose can reach 84.8%, 85.6%, and 63.2% %; In the stage of hydrogenolysis of mixed sugar liquid, the catalyst used is 5% Ru / C, and the reaction is 30 minutes, the yield of 1,2-propanediol reaches 25.6%, the yield of ethylene glycol reaches 13.8%, 1,2-butanediol The yield of alcohol reaches 2.7%, the yield of 1,2-hexanediol reaches 0.1%, and the yield of glycerin reaches 20.4%.

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Abstract

The invention relates to a method for preparing dihydric alcohol from lignocellulosic biomass, which has main steps of: 1, adding alkali liquor, acid liquor or water for pretreatment after lignocellulosic biomass crushing; 2, carrying out enzymolysis and concentrating liquid glucose filtered through enzymolysis after decoloration and ion exchange impurity removal; 3, adding catalysts with hydrogenation hydrogenolysis activity for carrying out hydrogenation hydrogenolysis reaction on the concentrated liquid glucose under the conditions of the pH being 8 to 14, the temperature being 130 to 250 DEG C and hydrogen atmosphere, separating the catalysts, and producing various dibasic alcohol with the carbon number being 2 to 6 after product rectification. The method utilizes the lignocellulosic biomass pretreatment-zymolyting glucose liquid as raw materials, and monosaccharide, soluble polysaccharides and sugar degradation products can respectively react, so both the efficiency and the process controllability can be greatly improved, and products can be independently used through separation and can be directly used for producing unsaturated polyester resin, polyurethane, fuel additives, surface active agents, emulsifying agents, motor vehicle antifreeze fluid and the like without depth separation.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a method for preparing diols, in particular to a method for preparing diols from lignocellulosic biomass through pretreatment-enzymatic saccharification, hydrogenation hydrogenolysis and other processes. Background technique [0002] Glycol compounds are very important polyester polymer monomers. Ethylene glycol, propylene glycol, butanediol, etc. can be used to react with diacids to produce polyester materials with excellent performance, so the demand and output are huge. At present, most of the industrial processes for preparing diols are based on petrochemical raw materials. However, as the crisis of non-renewable resources such as crude oil and coal becomes more and more obvious, it has become an inevitable trend to use renewable resources as raw materials to replace traditional petrochemical industrial processes with environmentally friendly green proce...

Claims

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Application Information

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IPC IPC(8): C12P7/18C12P19/14C07C31/20C07C29/136
Inventor 牟新东王喜成吴锋刘超王海松刘晔菲姜义军
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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