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Process for production of organic acids and esters thereof

A technology of organic acid and product flow, applied in the production and recovery of organic acids such as lactic acid and its esters, small to the smallest field, can solve the problems of high temperature, high cost of diaphragm, low rate of total evaporation, etc., and achieve high ammonia release rate and degree, cost reduction effect

Inactive Publication Date: 2007-05-16
A STALEY MFG CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the rate of pervaporation is relatively low, and the cost of the membrane is high, and ammonium lactate decomposition requires higher temperatures than existing membranes
[0037] Two issues that the above patents do not effectively address are (1) how to promote the removal of ammonia, and (2) how to promote the esterification reaction to achieve high conversion levels, both of which can reduce the formation of undesired side reaction products. Small to minimal, and for both methods, how to do this at high speed with relatively simple equipment

Method used

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  • Process for production of organic acids and esters thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0095] A vertical gas stripping contact reactor was fabricated. It is 3 / 8" OD stainless steel and houses 12" deep ProPak 316 stainless steel screen mass transfer packing. A high-pressure metering pump is used to continuously feed the liquid feedstock to the top of the stripping column at a rate of 1.0 ml / min. The residence time of liquid on the packing of the reactor is estimated to be about 25 to 50 seconds depending on the flow rate of liquid and vapor, which depends on the feed rate, temperature and pressure of the system.

[0096] The liquid fed to the top of the stripping column contained the following composition: 48 grams of 80% ammonium lactate obtained from Pflautz and Bauer, 356 grams of absolute ethanol. Hot nitrogen at a temperature of 150°C and a flow rate of 0.16 g / min was fed into the bottom of the stripping column. The wall of the stripping tower is divided into two heating sections, and the heating of each section is controlled by a thermocouple probe fixed ...

Embodiment 2

[0100] The stripping reactor test of Example 1 was repeated at a higher system pressure of 162 psig. The temperature of the steam at the top of the tower is 152-155°C. The same feed composition, feed rate and nitrogen flow were used. About 67% of the material in the feed was condensed into condensates. 43.7% of the total ammonia in the feed was collected in the collector and condensate. The nitrogen input temperature was controlled at 151°C.

Embodiment 3

[0102] The stripping reactor test of Example 2 was repeated at a system pressure of 162 psig. Reduce the thermal load on the reactor. The overhead vapor temperature was 101°C and the fraction at the end as condensate averaged 23% of the total feed. 20.9% of the total ammonia in the feed was collected in collectors and condensate. This shows that in the stripping reactor employed, the steam temperature is important in determining the conversion. The nitrogen input temperature was controlled to be 142°C. It is necessary to provide sufficient heat to the decomposition reactor in order to obtain good decomposition performance as obtained in Example 2.

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Abstract

A process is disclosed for producing an organic acid and optionally for simultaneously producing an ester of the organic acid. The process comprises the steps of: (a) combining an aqueous diluent, an ammonium salt of an organic acid, and an alcohol, thereby forming a homogeneous liquid feed mixture; (b) rapidly heating the feed mixture at a pressure sufficient to suppress at least some vaporization of the alcohol and holding it at a temperature and for a time sufficient to decompose the ammonium salt of the organic acid into ammonia and free organic acid while rapidly removing the ammonia from the reaction-mass transfer equipment, and optionally to react at least some of the free organic acid with the alcohol to form an ester of the organic acid, thereby producing (i) a vapor product stream that comprises ammonia, water, and alcohol, and (ii) a liquid product stream that comprises free organic acid, optionally ester, and alcohol, where of the total quantity of alcohol in the vapor product stream and the liquid product stream, at least about 10 % by weight is present in the liquid product stream; and (c) recovering the free organic acid and optionally the ester from the liquid product stream. The liquid feed mixture can comprise a concentrated crude or partially purified broth produced by a fermentation process.

Description

Background technique [0001] The present invention relates to a process for the production and recovery of organic acids such as lactic acid and its esters. [0002] Organic acids such as lactic acid have many chemical uses, for example in food processing, pharmaceuticals, plastics, textile industries, and as raw materials in various chemical processes. It is well known that organic acids can be produced by fermenting sugar, starch, or cheese whey, using microorganisms such as Lactobacillus delbruecdii to convert monosaccharides such as glucose, fructose, or galactose, or disaccharides such as sucrose or lactose , into organic acids such as lactic acid. The fermented culture contains both acids and unfermented sugars, carbohydrates, amino acids, proteins and salts. Some of these substances produce unwanted colors. The acid must therefore usually be recovered from the fermentation culture before actual use. [0003] During the production of organic acids such as lactic acid ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C51/42C07C59/08C07C69/66C07C51/41C07C67/08
CPCC07C51/412C07C51/42C07C67/08C07C59/08C07C69/68
Inventor M·C·M·科克雷姆
Owner A STALEY MFG CO