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Preparation method of lactic acid

A lactic acid, high temperature and high pressure technology, applied in the preparation of carboxylate salts, organic compounds, chemical instruments and methods, etc., can solve the problems of low production efficiency, poor catalyst selectivity and catalytic activity, and achieve process safety and synthetic reaction Safe and fast, high space-time yield effect

Pending Publication Date: 2021-12-31
江苏索普工程科技有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Based on this, it is necessary to provide a preparation method for lactic acid aiming at the low production efficiency of the traditional lactic acid production method, the problems of poor selectivity and catalytic activity of the catalyst

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Catalyst preparation: weigh AuCl 3 ·HCl·4H 2 O(0.2715g), Pd(NO 3 ) 2 2H 2 O (0.1756 g) was prepared into 100 mL precursor solutions with a molar concentration of 0.0066 mol / L, and after mixing, 4 g of CaF 2 Ca(PO 4 ) 2 (carrier); add 3000mg of Microporosa hemoglobinus and 3000mg of dried bacteria of Bacillus licheniformis to the mixture of precursor and carrier, then shake and cultivate at room temperature for 48h at 200rpm, centrifuge the above mixture, and wash the bacteria three times After drying in vacuum at 40°C, it was Au with a loading capacity of 5%. 1 PD 1 -CaF 2 Ca(PO 4 ) 2 catalyst.

[0030] Preparation of lactic acid: Dissolve 38.045g of 1,2-propanediol in 100mL of water to obtain 5mol·L -1 solution, with 6.667gAlCl 3 (i.e. 1,2-propanediol and AlCl 3 The molar ratio of substances is 1:0.1), 3.1856g catalyst (that is, the molar ratio of metal to 1,2-propanediol is 1:500) is mixed and added into the high temperature and high pressure reactor, an...

Embodiment 2

[0033] In this example, the preparation method of the catalyst used is the same as that of Example 1.

[0034] Preparation of lactic acid: Dissolve 38.045g of 1,2-propanediol in 100mL of water to obtain 5mol·L -1 solution, with 6.667gAlCl3 (i.e. 1,2-propanediol and AlCl 3 The molar ratio of substances is 1:0.1), 3.1856g of catalyst (that is, the molar ratio of metal to 1,2-propylene glycol is 1:500) are mixed and added into the high temperature and high pressure reactor, and the air in the kettle is purged with oxygen and passed through oxygenation Control the reaction pressure; first raise the temperature to 50°C for half an hour, then continue to raise the temperature to 60°C and maintain a stirring rate of 200rpm, react for 2 hours and then cool down to room temperature, take out the contents of the high-temperature and high-pressure reactor and filter, and filter the obtained loaded metal The catalyst is recycled after being washed and dried with methanol, and the liquid ...

Embodiment 3

[0037] In this example, the preparation method of the catalyst used is the same as that of Example 1.

[0038] Preparation of lactic acid: Dissolve 7.609g of 1,2-propanediol in 100mL of water to obtain 1mol L -1 solution, with 1.3334gAlCl 3 (i.e. 1,2-propanediol and AlCl 3 The molar ratio of substances is 1:0.1), 0.6371g catalyst (that is, the molar ratio of metal to 1,2-propylene glycol is 1:500) is mixed and added into the high-temperature and high-pressure reactor, and the air in the kettle is purged with oxygen and passed through oxygenation. Control the reaction pressure; first raise the temperature to 50°C for half an hour, then continue to raise the temperature to 160°C and maintain a stirring rate of 200rpm, react for 2 hours and then cool down to room temperature, take out the contents of the high-temperature and high-pressure reactor and filter, and filter the obtained loaded metal The catalyst is recycled after being washed and dried with methanol, and the liquid ...

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PUM

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Abstract

The invention relates to a preparation method of lactic acid, which comprises the steps of: 1, adding a 1, 2-propylene glycol solution, AlCl3 and a supported metal catalyst into a high-temperature and high-pressure reaction kettle, purging air in the high-temperature and high-pressure reaction kettle, and controlling the reaction pressure through oxygenation; 2, stirring the substances in the high-temperature and high-pressure reaction kettle to enable the substances to react in the high-temperature and high-pressure reaction kettle so as to promote selective oxidation of 1, 2-propylene glycol and prepare lactic acid; and 3, after the reaction is finished, reducing the temperature in the high-temperature and high-pressure reaction kettle to the room temperature, taking out and filtering the substances in the high-temperature and high-pressure reaction kettle, washing and drying a supported metal catalyst obtained through filtering, and rectifying liquid obtained through filtering to obtain lactic acid. According to the method, 1, 2-propylene glycol is catalyzed to be converted into lactic acid under a mild condition through the activation effect of lewis acid on hydroxyl functional groups, the preparation process is in an acid environment, the defect that lactate is obtained under an alkaline condition is overcome, the tedious subsequent separation and acidification steps are omitted, and the preparation reaction speed and the production efficiency are improved.

Description

technical field [0001] The invention relates to the technical field of organic compound synthesis, in particular to a method for preparing lactic acid. Background technique [0002] Lactic acid is one of the three major organic acids. It is a fine chemical with a wide range of uses. It can be used to produce new degradable plastics, food additives, preservatives, carriers, pharmaceutical preparations, etc. Lactic acid is widely used in various industries. [0003] In recent years, the worldwide output of lactic acid is about 120kt / year, and it is a major chemical raw material with high demand and high commercial application value. Traditionally, lactic acid is fermented from glucose, starch and sugar cane. However, this traditional fermentation route is expensive and complicated, and the products are difficult to separate and purify. Therefore, it is necessary to explore a low-cost, efficient and environmentally friendly production route for lactic acid. [0004] 1,2-pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C59/08C07C51/235C07C51/42C07C51/44B01J27/185B01J37/36
CPCC07C51/235C07C51/42C07C51/44B01J27/1856B01J37/36C07C2527/185C07C59/08Y02P20/584
Inventor 刘玲沈灵沁邵守言熊雄朱桂生许宝华陈钢黄春霞
Owner 江苏索普工程科技有限公司
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