Process for reclaiming catalyst for use in synthesis of acesulfame potassium

An acesulfame potassium and catalyst technology, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical/physical processes, etc., can solve the problem of not finding the recovery catalyst triethylamine process and the like , to achieve the effect of simple and feasible process operation, short processing time and high purity

Inactive Publication Date: 2006-12-27
SUZHOU HOPE TECH
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  • Abstract
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Problems solved by technology

Taking triethylamine as a catalyst to synthesize other relevant materials of acesulfame potassium: such as the paten

Method used

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Embodiment

[0011] (1), in the 500ml three-neck reaction flask that has stirring and temperature measuring device and distillation device, add 40.0g calcium oxide, 70.0g water, dropwise add the mixture of 330.0g containing triethylamine sulfate (containing triethylamine) while stirring About 5% ethylamine, containing 27.85% sulfuric acid), the temperature of the reaction system was raised to 70°C-120°C, and the distillation was carried out for 150 minutes. 16.5 g of triethylamine was obtained with a water content of 65.33‰. Its reaction equation is as follows:

[0012]

[0013]

[0014] (2), in the mixture of steaming triethylamine in step (1), add concentrated sulfuric acid 22g dropwise, stir while adding dropwise, after completion of the reaction, this reaction solution is filtered to obtain 233.0g gypsum (water content 10%). Its reaction equation is as follows:

[0015]

[0016]

[0017] (3), add triethylamine and 3.5g calcium oxide that obtain in step (1)...

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Abstract

The invention discloses a process for recovering catalyst in synthesizing potassium acetylsulfanilate, which includes steps of: (1) neutralizing mixture containing triethylamine sulphate with base or basic salt, rising the temperature to 70-120 DEG C for distilling triethylamine. (2) removing water of triethylamine received in step (1) to obtain high purity triethylamine. In addition, acid could be added to the mixture of removing triethylamine in step (1) to neutralizing excess base, and gypsum is obtained by filtrating reactive liquid. The excellence of this method is that the process is simple, processing time is short, damage to the device is slight, having no contamination to environment, the retrieving triethylamine have high purity and can be used for synthesizing potassium acetylsulfanilate after removing water, and the byproduct such as gypsum also has some economic benefit

Description

technical field [0001] The invention relates to a process for recovering triethylamine from a mixture produced in the process of synthesizing acesulfame potassium with triethylamine as a catalyst. Background technique [0002] Acesulfame potassium is a sweetener widely used in food and beverage industries. The compound has the advantages of good water solubility, high sweetness, stable physical and chemical properties, strong synergistic effect, non-metabolism and the like. [0003] There are many ways to synthesize acesulfame potassium. The synthetic method of acesulfame potassium involved in the present invention is the U.S. Patent No. US4,695,629 expired in March, 2005, and its synthetic method is as follows: with sulfamic acid under the catalysis of triethylamine and diketene The reaction produces triethylamine salt of acetoacetylsulfamate, and then the ring is closed with sulfur trioxide to obtain acesulfame acid, which is then reacted with potassium hydroxide to obta...

Claims

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Application Information

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IPC IPC(8): B01J23/04C07C291/06C07C211/05
Inventor 陈小萍陈颖沈建惠包忠祥刘纪才
Owner SUZHOU HOPE TECH
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