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Method for preparing lactic acid by hydrolysis of biomass

A biomass and lactic acid technology, applied in the preparation of organic compounds, carboxylate salts, chemical instruments and methods, etc., can solve the problems of unfavorable industrial production and application of lactic acid, high catalyst price, complicated production process, etc., and achieve rapid response , The catalytic system is simple and the effect of saving resources

Inactive Publication Date: 2015-08-19
SHAANXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as far as the current market is concerned, these methods all have relatively high catalyst prices, complicated production processes, long reaction times, and high preparation costs, which are not conducive to the industrial production and application of lactic acid.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Taking 0.3g of cellulose raw material as an example, the method for preparing lactic acid consists of the following steps:

[0015] (1) Put 0.3g of cellulose and 30mL of water in a 35mL autoclave, then add 0.03g of lanthanum trifluoromethanesulfonate as a catalyst, the mass ratio of cellulose to water and lanthanum trifluoromethanesulfonate is 1:100:0.1, at room temperature with N 2 carry out emptying;

[0016] (2) in N 2 Under the conditions, the pressure is 2MPa, the temperature is 220°C, and the reaction is carried out in a high-pressure reactor for 40 minutes until the cellulose is completely hydrolyzed, cooled to room temperature in an ice bath, centrifuged, and purified by rotary steaming at 50°C for 2 hours to obtain lactic acid, and the yield of lactic acid is 98.2 %.

[0017] The above-mentioned cellulose is a polysaccharide composed of linear D-glucose units linked by β-1,4 glycosidic bonds. In this embodiment, microcrystalline cellulose is used, with a par...

Embodiment 2

[0019] Taking 0.3g of cellulose raw material as an example, the method for preparing lactic acid consists of the following steps:

[0020] (1) Take 0.3g of cellulose and 30mL of water in a 35mL autoclave, and then add 0.075g of lanthanum trifluoromethanesulfonate as a catalyst. The mass ratio of cellulose to water and lanthanum trifluoromethanesulfonate is 1:100:0.25, at room temperature with N 2 carry out emptying;

[0021] Other steps are identical with embodiment 1, obtain lactic acid.

Embodiment 3

[0023] Taking 0.3g of cellulose raw material as an example, the method for preparing lactic acid consists of the following steps:

[0024] (1) Take 0.3g of cellulose and 22.5mL of water in a 35mL autoclave, then add 0.06g of lanthanum trifluoromethanesulfonate as a catalyst, the mass ratio of cellulose to water and lanthanum trifluoromethanesulfonate 1:75:0.2 at room temperature with N 2 carry out emptying;

[0025] Other steps are identical with embodiment 1, obtain lactic acid.

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PUM

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Abstract

The invention provides a method for preparing lactic acid by hydrolyzing biomass, and the method realizes the purpose of preparing the lactic acid through hydrolization under the action of an acidic catalyst by taking biomass as a raw material, water as a reaction solvent and a salt of trifluoromethanesulfonic acid as a catalyst. The method provided by the invention has the advantages of simple preparation process, easiness for raw material obtaining, quick reaction, high catalyst activity, few byproduct, resource conservation and cost reduction because the catalyst can be recycled through extraction, important application value and suitability for industrialized production and application; and according to the invention, the process is environmentally-friendly without pollution, a catalyzing system is relatively simple, the raw material conversion rate can achieve 100%, and the lactic acid yield can maximally achieve 98.2%.

Description

technical field [0001] The invention belongs to the technical field of chemical development of lactic acid, in particular to a method for preparing lactic acid by acidic hydrolysis of biomass as a raw material. Background technique [0002] Cellulose is the most abundant and cheapest biomass renewable resource on the earth. Due to its wide distribution in nature and good ecological benefits, it has attracted people's attention. Using chemical methods to efficiently convert cellulose into high value-added products The product lactic acid has important social and economic significance. [0003] Lactic acid, chemical name 2-hydroxypropionic acid, is one of the three recognized organic acids in the world. Lactic acid widely exists in nature and is mainly used in food, medicine and chemical industries. With the development of its deep processing field and the continuous improvement of people's material living standards, the demand for lactic acid is also increasing. [0004] I...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C59/08C07C51/00
CPCY02P20/584
Inventor 董文生王芬芬刘春玲
Owner SHAANXI NORMAL UNIV
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