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Preparation method of lactate catalyst and application

A lactate and catalyst technology, applied in the preparation and application field of lactate catalyst, can solve the problems of low preparation yield, cumbersome steps, yield only 80%, etc., achieves simple preparation process, easy-to-obtain raw materials, improved The effect of yield

Inactive Publication Date: 2007-02-28
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Tang Yougen etc. mentioned the preparation of zinc lactate in "Chemical World", 1997, pages 586-589, but its preparation yield was low; Zhao Weijie et al. mentioned food The preparation of additive-zinc lactate, but its steps are relatively cumbersome, and the yield is only about 80%

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0022] Example 1: Preparation of Zinc Lactate

[0023] Place zinc oxide in a drying oven at about 100°C and dry for 2 hours, mix lactic acid and zinc oxide at a ratio of 2.2:1, add 800ml of water, add an appropriate amount of water during the reaction, and the reaction is <100 °C for 1 hour with continuous stirring. Concentrate the obtained zinc lactate aqueous solution to a certain volume under reduced pressure, add absolute ethanol, place it in the refrigerator overnight, filter with suction, dissolve the solid sample with freshly prepared primary distilled water, concentrate under reduced pressure, precipitate with absolute ethanol, and repeat the dissolution- The precipitation steps are 2-3 times, and finally the pure solid product is obtained by suction filtration, and the yield is 99.8%-99.9%.

example 2

[0024] Example 2: Preparation of Zinc Lactate

[0025] Put the zinc oxide in a drying oven at about 100°C and dry for 2 hours, add an appropriate amount of warm water (water temperature <90°C) to the zinc oxide, and after it is evenly dispersed, add an appropriate amount of warm lactic acid and zinc oxide according to the amount of the substance The ratio is 3:1 reaction. During the reaction, 1000 ml of water was added, and the reaction was continued for 1 hour at <100° C. with continuous stirring. Concentrate the prepared zinc lactate aqueous solution to a certain volume under reduced pressure, add absolute ethanol, place it in the refrigerator overnight, filter with suction, dissolve the solid sample with freshly prepared distilled water, concentrate under reduced pressure, precipitate with absolute ethanol, and repeat the dissolution-precipitation The steps are 2-3 times, and finally the solid pure product is obtained by suction filtration, 99.8%-99.9%.

example 3

[0026] Example 3: Preparation of Calcium Lactate

[0027] Lactic acid and calcium carbonate are mixed in a ratio of 4:1 according to the amount of substances, and the reaction temperature is <100°C. During the reaction, about 1000ml of water is added, stirred continuously, and reacted for 1-1.5 hours; the reacted calcium lactate aqueous solution is concentrated under reduced pressure to Add a certain volume of absolute ethanol, put it in the refrigerator overnight, filter with suction, dissolve the solid sample with freshly prepared distilled water, concentrate under reduced pressure, precipitate with absolute ethanol, repeat the dissolution-precipitation steps 2-3 times, and finally obtain a solid by suction filtration Pure product with a yield of 99.8% to 99.9%.

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PUM

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Abstract

The invention discloses a lactic catalyst and application in the esterification reaction and lactone synthetic course, which comprises the following steps: blending lactic acid and metal oxide or inorganic salt; adding fitful water; reacting for several hours; adopting recrystallization method to produce lactate.

Description

technical field [0001] The invention relates to a cheap lactate catalyst with good compatibility with the reaction system, its preparation method and its application in esterification and lactone synthesis. Background technique [0002] Lactate as an additive, such as zinc lactate, calcium lactate, has been widely used in the food and pharmaceutical industries. The synthesis conditions of lactone are mild, the raw materials are easy to obtain, the preparation process is simple, the reaction conversion rate is high, and the lactate anion it has makes it have good compatibility with hydroxy acid, one of the raw materials for lactone synthesis. The degree of dispersion is good, which is conducive to the full contact of the solid-liquid system. Therefore, in recent years, some researchers have used lactone as a catalyst for the synthesis of lactone, especially lactide, among which zinc lactate is commonly used, which has a good catalytic effect and is easy to recycle and reuse....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C59/08B01J31/04C07D319/12
Inventor 罗彦凤王远亮陈佳黄美娜傅春华牛旭锋李永刚
Owner CHONGQING UNIV
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