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Method for preparing lactic acid from carbohydrates in mild conditions

A sugar and condition technology, applied in the field of high-efficiency and low-energy-consumption preparation of lactic acid, can solve problems such as unfavorable industrial operation, increased workload and cost, and achieve the effects of low energy consumption and controllable reaction process

Inactive Publication Date: 2016-07-20
AGRO ENVIRONMENTAL PROTECTION INST OF MIN OF AGRI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It is not conducive to industrial operation, and many catalysts require additional steps for preparation, increasing workload and cost

Method used

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  • Method for preparing lactic acid from carbohydrates in mild conditions
  • Method for preparing lactic acid from carbohydrates in mild conditions
  • Method for preparing lactic acid from carbohydrates in mild conditions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Take 3.1548gBa(OH) 2 ·8H 2 O, dissolved in 20mL of deionized water, then weighed 0.36g of glucose and mixed with it. Inject high-purity N at a flow rate of 0.6L / min 2 , kept for 3 minutes, and then quickly closed the reactor, transferred it to a constant temperature shaker at 25°C, with a rotation speed of 100r / min, and reacted for 48h. After the reaction was completed, draw 5mL of the reaction solution, and use 5mL of 0.5MH 2 SO 4 Diluted 2 times while removing Ba 2+ Effect on the column. After dilution, the liquid was injected into liquid chromatography to measure the conversion rate of the substrate and the yield of lactic acid. The substrate conversion rate was 99.2%, the lactic acid yield was 82.1%, and the lactic acid selectivity was 82.7%.

Embodiment 2

[0019] Take 0.4g NaOH, dissolve it in 20mL deionized water, then weigh 0.36g glucose and mix it. Inject high-purity N at a flow rate of 0.6L / min 2 , kept for 3 minutes, and then quickly closed the reactor, transferred it to a constant temperature shaker at 25°C, with a rotation speed of 100r / min, and reacted for 48h. After the reaction was completed, draw 5mL of the reaction solution, and use 5mL of 0.5MH 2 SO 4 After diluting by 2 times, the diluted liquid enters the liquid chromatography to measure the conversion rate of the substrate and the yield of lactic acid. The substrate conversion rate was 76.1%, the lactic acid yield was 39.9%, and the lactic acid selectivity was 52.4%.

Embodiment 3

[0021] Take 0.561g KOH, dissolve it in 20mL deionized water, then weigh 0.36g glucose and mix it. Inject high-purity N at a flow rate of 0.6L / min 2 , kept for 3 minutes, and then quickly closed the reactor, transferred it to a constant temperature shaker at 25°C, with a rotation speed of 100r / min, and reacted for 48h. After the reaction was completed, draw 5mL of the reaction solution, and use 5mL of 0.5MH 2 SO 4 After diluting by 2 times, the diluted liquid enters the liquid chromatography to measure the conversion rate of the substrate and the yield of lactic acid. The substrate conversion rate was 77.1%, the lactic acid yield was 37.9%, and the lactic acid selectivity was 49.2%.

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Abstract

The invention provides a method for preparing lactic acid from carbohydrates in mild conditions. The involved catalyst is an alkali metal or alkaline-earth metal oxide, including Ba(OH)2, NaOH and KOH; N2, Ar or H2 is a protection gas; the carbohydrates include glucose, fructose, cellobiose, dihydroxy acetone, pyruvic aldehyde, glyceraldehyde and the like; the catalytic reaction system is simple and easy to operate; the reaction is carried out at low-to-medium temperature and under normal pressure; the adopted catalyst and substrate are common and easily available; the substrate conversion rate is over 96%; the lactic acid yield is up to more than 90%; and the lactic acid yield and selectivity are both relatively high. The method provided by the invention has the advantages of relatively high catalytic conversion efficiency, low energy consumption, safe and simple process and the like and has a broad industrial application prospect.

Description

【Technical field】 [0001] The invention relates to the field of lactic acid preparation and biomass conversion and utilization, in particular to a method for preparing lactic acid with high efficiency and low energy consumption under mild conditions of low temperature to medium temperature and normal pressure by using an alkaline catalyst. 【Background technique】 [0002] With the consumption of fossil fuels and the emphasis on environmental issues around the world, more attention has been paid to the preparation of fuels and chemicals from renewable resources. Biomass, as a widespread and cheap renewable resource, has become an important research object. A class of biomass represented by sugar can be converted into a variety of important platform compounds, such as formic acid, acetic acid, levulinic acid, lactic acid, 5-Hydroxymethylfurfural, etc., there have been a lot of literature reports on related research. [0003] Lactic acid is an important chemical platform compoun...

Claims

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Application Information

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IPC IPC(8): C07C51/00C07C59/08
CPCC07C51/00C07C59/08
Inventor 漆新华李陆杨
Owner AGRO ENVIRONMENTAL PROTECTION INST OF MIN OF AGRI
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