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Phenylacetic acid production method

A production method and technology of phenylacetic acid, which are applied to the preparation of carboxylic acid by carbon monoxide reaction, separation/purification of carboxylic acid compounds, and alkali metal chlorides, etc., can solve problems such as product quality and use field restrictions, three-waste pollution, etc.

Pending Publication Date: 2021-09-07
李乾華
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the monopoly advantage of a few enterprises on raw materials, the phenylacetonitrile hydrolysis method has gradually formed an oligopoly, but the serious three waste pollution is still difficult to control, and the product quality and application fields are limited.

Method used

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Embodiment 1

[0032] A method for producing phenylacetic acid, comprising the steps of:

[0033] S1. Raw material preparation:

[0034] Prepare raw materials such as benzyl chloride, sodium hydroxide, carbon monoxide, hydrochloric acid, toluene, and catalysts, which are provided by public works, storage tanks or supporting projects; benzyl chloride is industrial grade, with a content greater than 99.5%, and the content of impurities is controlled; sodium hydroxide is an ion Membrane caustic soda, which can be solid sodium hydroxide, 50% sodium hydroxide or 32% sodium hydroxide; carbon monoxide is supplied by external devices, such as carbon monoxide produced by natural gas conversion, carbon monoxide produced by water gas separation, carbon monoxide produced by methanol cracking, carbon monoxide produced by coke, calcium carbide tail gas Production of carbon monoxide, yellow phosphorus tail gas production of carbon monoxide, etc., require the content of carbon monoxide to be greater than 95...

Embodiment 2

[0091] A method for producing phenylacetic acid, comprising the steps of:

[0092] S1. Raw material preparation:

[0093] Prepare raw materials such as benzyl chloride, potassium hydroxide, carbon monoxide, hydrochloric acid, toluene, and catalysts, which are provided by public works, storage tanks or supporting projects; benzyl chloride is industrial grade, with a content greater than 99.5%, and the content of impurities is controlled; potassium hydroxide is solid Potassium hydroxide; carbon monoxide is supplied by external devices, such as carbon monoxide produced by natural gas conversion, carbon monoxide produced by water gas separation, carbon monoxide produced by methanol cracking, carbon monoxide produced by coke, carbon monoxide produced by calcium carbide tail gas, carbon monoxide produced by yellow phosphorus tail gas, etc., the carbon monoxide content is required to be greater than 95%, oxygen Content is lower than 30ppm; Hydrochloric acid is the synthetic hydrochlo...

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Abstract

The invention discloses a phenylacetic acid production method, which belongs to the technical field of phenylacetic acid production. The phenylacetic acid production method comprises the following steps of raw material preparation, raw material mixing, synthesis reaction, oil-water phase separation, acidification reaction, crystallization, centrifugation, drying, MVR, condensed water purification and toluene rectification. According to the method, sodium cyanide is replaced with carbon monoxide, two highly toxic materials, namely sodium cyanide and benzyl cyanide, in the production process are reduced, the cost is lower, the product quality is better, and the method can be applied to wider fields due to the fact that the method does not contain cyanide; cyclic utilization of the catalyst, cyclic utilization of materials and cyclic utilization of water are achieved, the technology, the concept and the equipment are advanced, the system inclusiveness is extremely high, and discharge of process wastewater is completely eradicated.

Description

technical field [0001] The invention relates to the technical field of phenylacetic acid production, in particular to a method for producing phenylacetic acid. Background technique [0002] Phenylacetic acid is an important intermediate of fine chemicals such as pharmaceuticals and spices, belonging to the category of fine chemicals. In medicine, phenylacetic acid is mainly used to produce penicillin, and is also used to prepare sedative and antidepressant amitriptyline, and epilepsy drug phenobarbital. In industry, phenylacetic acid is often used in the preparation of high-performance engineering plastic curing agents, fluorescent whitening agents, fuels, and display agents for photosensitive materials. In addition, in terms of spices, phenylacetic acid is an edible spice that is allowed to be used in my country, and is mainly used in the production of food, detergents, cleaning agents, cosmetics, tobacco, and beverages. [0003] There are dozens of production methods of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C51/10C07C57/32C07C51/42C01D3/04C01D3/14
CPCC07C51/10C07C51/42C01D3/04C01D3/14C07C57/32Y02P20/584
Inventor 李乾华
Owner 李乾華
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