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Method for catalytically synthesizing ethyl lactate from ammonium lactate

A technology for catalyzing ammonium lactate to synthesize ethyl lactate and ethyl lactate, which can be used in chemical instruments and methods, preparation of organic compounds, preparation of carboxylic acid esters, etc., and can solve the problems of difficult membrane technology and expensive catalysts.

Inactive Publication Date: 2003-01-15
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The catalyst used in this patent method is expensive, and the membrane technology used in membrane separation is difficult to realize in China, and the yield of ethyl lactate is 9.17-11.7%.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0014] Raw material composition: ammonium lactate (70-80%), ethanol (anhydrous)

[0015] Ethanol: ammonium lactate=2.5:1 (molar ratio), the catalyst is AlCl 3 , consumption is 2% of ammonium lactate weight. Add benzene (analytical pure) as a dehydrating agent and a little zeolite.

[0016] Put the raw materials into a 500ml reaction kettle according to the above ratio, and heat with an electric heating mantle. Use a constant pressure dropping funnel to add ethanol dropwise. The temperature at the top of the tower is controlled at 64-65°C, and the temperature of the reactor is controlled at below 80°C. After condensation, the reflux liquid in the water separator is layered. Rich in organic phase, as long as the water surface does not touch the nozzle of the return pipe, no water will be released. When the water surface rises to the nozzle, the water will be released slowly, and the water discharge rate will be maintained at the controlled water surface. The reaction will stop...

example 2

[0018] Ethanol: ammonium lactate=1.5:1 (molar ratio), the catalyst is FeCl 3 , consumption is 1.5% of ammonium lactate weight, and the reaction time is 96h, and ethyl lactate yield is 17.4%, and all the other are the same as example one

example 3

[0020] Ethanol: ammonium lactate=3.5:1 (molar ratio), the catalyst is ZnCl 2 , the consumption is 1% of ammonium lactate weight, the reaction time is 96h, the yield of ethyl lactate is 12.7%, all the other are the same as example one.

[0021] Compared with the existing preparation method of ethyl lactate, the present invention has the advantages that the catalyst used is cheap and easy to obtain, the production cost is reduced, the production process does not cause environmental pollution, and the dehydration adopts the entrainer dehydration method, which is mature in technology and easy to obtain. Grasp; the yield of ethyl lactate can reach 12.7~20.1%, which is higher than the 9.17~11.7% yield of ethyl lactate reported in the US patent.

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PUM

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Abstract

By using ammonium lactate, which may be produced through a fermentation process of producing lactic acid adding ammonia water to regulate pH value of fermentation liquid, and ethanol as material and metal halide as catalyst, ethyl lactate is produced through reaction. The present invention features that metal halide as catalyst and benzene as dewatering agent. The present invention has the advantages of cheap catalyst, lwo production cost, no environmental pollution and ethyl lactate yield up to 12.7-20.1 %, higher than that reported in an American patent 9.17-11.7 %.

Description

technical field [0001] The invention relates to a method for synthesizing ethyl lactate catalyzed by ammonium lactate, which belongs to the preparation technology of ethyl lactate. Background technique [0002] Ethyl lactate is a colorless transparent liquid with wine aroma, also known as ethyl 2-hydroxypropionate. In the traditional consumption field, it is mostly used in food additives and pharmaceutical intermediates. Because of its low boiling point, non-toxicity and good solubility, it has broad application prospects as a green solvent. [0003] The domestic production of ethyl lactate is divided into two parts: one is the production of lactic acid by fermentation, and the other is the production of ethyl lactate by the reaction of lactic acid and ethanol. In the above-mentioned process of producing lactic acid, due to the generation of by-product calcium sulfate, it not only causes environmental pollution, but also increases the manufa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C67/08C07C69/68
Inventor 高静赵学明
Owner TIANJIN UNIV