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Method for preparing ethyl lactate by biomass hydrothermal liquefaction

A hydrothermal liquefaction, ethyl lactate technology, applied in chemical instruments and methods, preparation of organic compounds, preparation of carboxylate, etc., can solve the problems of entrained toxic solvents, low product yield, poor product quality, etc. The effect of high rate, huge economic benefit and simple process

Inactive Publication Date: 2017-10-10
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional preparation method of ethyl lactate is mainly through the fermentation of glucose to produce lactic acid, which is then synthesized through the esterification reaction of lactic acid and ethanol, which has problems such as low product yield, toxic solvents in the product, and poor product quality.

Method used

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  • Method for preparing ethyl lactate by biomass hydrothermal liquefaction
  • Method for preparing ethyl lactate by biomass hydrothermal liquefaction
  • Method for preparing ethyl lactate by biomass hydrothermal liquefaction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Put 0.5g rice straw and 20g ethanol in a 100mL stainless steel hydrothermal liquefaction reactor, add 0.056M catalyst SnCl 2 2H 2 O, and add 0.0458M metal chloride such as CoCl 2 , ZnCl 2 and SnCl 4 As a co-catalyst to increase the SnCl 2 2H 2 O catalytic activity. The mixture of rice straw, ethanol and catalyst was reacted at 220°C for 4 hours. Cool to room temperature after completion of the reaction, obtain the ethanol solution after filtration and analyze the content of ethyl lactate wherein by GC-MS, SnCl 2 and SnCl 4 The yield of ethyl lactate was the highest under the action of co-catalysis, about 22%.

Embodiment 2

[0028] Put 0.5g rice straw and 20g ethanol in a 100mL stainless steel hydrothermal liquefaction reactor, add catalyst SnCl 2 2H 2 O, and adding zeolite ZSM-5 as a co-catalyst to increase the SnCl 2 2H 2 O catalytic activity. SnCl 2 2H 2 The mass ratios of O and ZSM-5 are 1:1, 2:1 and 3:1. The mixture of rice straw, ethanol and catalyst was reacted at 220°C for 4 hours. Cool to room temperature after completion of the reaction, obtain the ethanol solution after filtration and analyze the content of ethyl lactate wherein by GC-MS, SnCl 2 When the mass ratio of ZSM-5 is 3:1, the yield of ethyl lactate is the highest, about 20%.

Embodiment 3

[0030] Put 0.5g rice straw and 20g ethanol in a 100mL stainless steel hydrothermal liquefaction reactor, add catalyst SnCl 2 2H 2 O, and adding zeolite ZSM-5 as a cocatalyst. The Si / Al ratio of ZSM-5 is 100, 150 and 200, ZSM-5 and SnCl 2 2H 2 The mass ratio of O is 3:1. The mixture of rice straw, ethanol and catalyst was reacted at 220°C for 4 hours. Cool to room temperature after completion of the reaction, obtain ethanol solution after filtration and analyze the ethyl lactate content wherein by GC-MS, the higher the Si / Al ratio, the higher the productive rate of ethyl lactate, when the Si / Al ratio is 200, the ethyl lactate The yield of ester is about 18%.

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Abstract

The invention provides a method for preparing ethyl lactate by biomass hydrothermal liquefaction. Biomasses comprise enteromorpha, micro-algae, straws, salix mongolica, tobacco stems, corncobs, wood shavings, water hyacinth and pine twigs. In hydrothermal liquefaction reaction, ethyl alcohol serves as a solvent, and metal chloride and zeolite serve as catalysts. In the reaction process, cellulose and semi-cellulose components in the biomasses are degraded into triose, the triose is further degraded to generate lactic acid, and the lactic acid and the ethyl alcohol are esterified to obtain the ethyl lactate. The metal chloride serving as Lewis acid and the zeolite serving as Bronsted acid participate in the reaction, so that the biomasses are directionally transformed into the ethyl lactate. The method can be used for preparing the ethyl lactate at one step, and the obtained ethyl lactate is high in yield, simple in process, free from toxic reagents, green and environmentally friendly, functions in promoting development of biological energy sources and biological refining industry, and can generate huge economic, social and ecological benefits.

Description

technical field [0001] The invention belongs to the field of environmental protection and resource comprehensive utilization, and specifically relates to a method for preparing ethyl lactate by hydrothermal liquefaction of biomass. The cellulose and hemicellulose components are degraded into three-carbon sugars by hydrothermal liquefaction technology, and the three-carbon sugars are further reacted to generate lactic acid, which is then esterified with ethanol to prepare ethyl lactate. The reaction uses metal chlorides and zeolites as catalysts, and participates in the reaction as Lewis acid and Bronsted acid respectively. The process has mild reaction conditions, uses biomass as raw material, and is environmentally friendly. It provides a new and sustainable method for the preparation of ethyl lactate. Background technique [0002] Ethyl lactate is a monobasic ester synthesized by the esterification of lactic acid and ethanol. Ethyl lactate has a high flash point, is non-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C67/08C07C69/68
CPCC07C51/00C07C67/08C07C69/68C07C59/08
Inventor 张士成拉菲亚·尤纳斯陈凯绯
Owner FUDAN UNIV
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