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A kind of phenylacetic acid continuous production process

A production process and technology of phenylacetic acid, applied in the preparation of carboxylate, separation/purification of carboxylic acid compounds, organic chemistry, etc., can solve the problems of large demand for operators, large number of equipment, low production efficiency, etc. The effect of good quality, improved product quality, and less equipment

Active Publication Date: 2019-03-12
HEBEI CHENGXIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the existing production process adopts intermittent tank reaction, the production efficiency is low, the number of equipment required is large, and the demand for operators is large.

Method used

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  • A kind of phenylacetic acid continuous production process

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Feed 30% sodium phenylacetate and 40% sulfuric acid into the mixer at the same time according to the mass ratio of 1:0.25. The temperature in the mixer is controlled at 70°C to 75°C. At this time, the pH of the feed liquid in the mixer is 1.5. After the feed liquid passes through the oil-water separation tower, the water phase continuously extracted from the tower kettle enters the wastewater treatment workshop, and the oil phase extracted from the top of the tower continuously enters the crystallization kettle. The mass ratio of the water phase and the oil phase entering the crystallization tank is 1:2, and the temperature of the crystallization tank is controlled at 35°C to 40°C by turning on the circulating water, and the liquid is continuously extracted from the crystallization tank and fed into the centrifuge. The whole production process adopts PLC automatic control system to realize the continuous production of phenylacetic acid. The product yield reaches 99.75%...

Embodiment 2

[0035] 35% sodium phenylacetate and 30% hydrochloric acid are fed into the mixer at the same time according to the mass ratio of 1:0.30. The temperature in the mixer is controlled at 80°C, and the pH of the feed liquid in the mixer is 2 at this time. After the feed liquid passes through the oil-water separator, the water phase continuously extracted from the tower kettle enters the wastewater treatment workshop, and the oil phase extracted from the tower top continuously enters the crystallization kettle. The mass ratio of the water phase and the oil phase is 1:3, the temperature of the crystallization tank is controlled at 45°C by turning on the circulating water, and the liquid is continuously extracted from the crystallization tank and fed into the centrifuge. The quality of the centrifuged phenylacetic acid is better than that of Example 1, the product yield reaches 99.71%, the liquid phase purity of the product is 99.88%, and the product purity is 99.94%.

Embodiment 3

[0037] Feed 40% sodium phenylacetate and 40% nitric acid into the mixer at the same time according to the mass ratio of 1:0.43. The temperature in the mixer is controlled at 90°C. At this time, the pH of the feed liquid in the mixer is 2.5. After the feed liquid passes through the oil-water separator, the water phase continuously extracted from the tower kettle enters the wastewater treatment workshop, and the oil phase extracted from the tower top continuously enters the crystallization kettle. The mass ratio of the water phase and the oil phase is 1:4, the temperature of the crystallization tank is controlled at 50°C by turning on the circulating water, and the liquid is continuously extracted from the crystallization tank and fed into the centrifuge. The product yield reaches 99.65%, the liquid phase purity of the product is 99.90%, and the product purity is 99.95%.

[0038] In this embodiment, the equipment is less, the process route is simple, labor, equipment, energy and...

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Abstract

The invention discloses a phenylacetic acid continuous production process, and relates to the technical field of phenylacetic acid production. The process comprises the following specific steps that a phenylacetate solution and a dilute acid solution are mixed and then continuously injected into an oil-water separator, and separated liquid phenylacetic acid is extracted continuously and put into a crystallizer; meanwhile, water is added into the crystallizer, cooling crystallization is conducted, a solid-liquid mixture continuous to be extracted from the crystallizer for centrifugation, and then a phenylacetic acid crystal is obtained. According to the phenylacetic acid continuous production process, problems existing in the intermittent production process at present are solved. The phenylacetic acid continuous production process adopts few devices, is simple in process route, reduces the cost of labor, equipment, energy and the like, improves the work environment, adopts automation control conveniently, well ensures the process safety and production continuity and stability, improves the purity and quality of products and is suitable for large-scale production application and prominent in economic benefit and social benefit.

Description

technical field [0001] The invention relates to the technical field of phenylacetic acid production. Background technique [0002] Phenylacetic acid is a colorless flaky crystal with a melting point of 76.5°C. It is easily soluble in hot water and slightly soluble in cold water. It is an important pharmaceutical intermediate with a large market demand. At present, the existing production process adopts intermittent tank reaction, which has low production efficiency, requires a large number of equipment, and requires a large number of operators. In the face of the high-speed development of the chemical industry, the realization of continuous production has become a trend. Contents of the invention [0003] The invention provides a continuous production process of phenylacetic acid, realizes the continuous production of phenylacetic acid, is convenient to adopt automatic control, saves labor costs, and has the characteristics of good product quality and high yield. [0004...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C51/02C07C51/42C07C51/43C07C57/32
CPCC07C51/02C07C51/42C07C51/43C07C57/32
Inventor 郎宝安申银山尹国华张辰亮解美仙张俞殷军利高永超李永安张盖飞王雪松杨红梅
Owner HEBEI CHENGXIN
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