Recovery process of phenylacetic acid

Abstract

A recovery process of phenylacetic acid belongs to the field of chemical technology, and more particularly, relates to a recovery process of phenylacetic acid. The invention provides a recovery process of phenylacetic acid, which has simple operations, low equipment requirements, and a high recovery rate. The process steps of the invention are that: adding 1000 ml of waste liquid into a three-mouth flask, adjusting the pH value to 2.0-3.0 with 20% hydrochloric acid, adding an extractant, controlling the temperature at 5-80 DEG C, stirring for 20-30 min, stopping stirring, transferring the mixed liquid into a separating funnel, allowing the liquid to stand for stratification; taking out the organic phase, adjusting the pH value to 9.0-9.5 with sodium hydroxide, transferring into a separating funnel, allowing the liquid to stand for stratification so as to remove the organic phase; heating the water phase to 50-60 DEG C, adding 5-25 g of active carbon for decoloration, filtering; cooling the filtrate, dropwisely adding 20% hydrochloric acid under stirring so as to adjust the pH to 2.0-3.0, performing crystal growing; performing suction filtration to obtain white sheet crystals, drying and weighing, calculating the yield, detecting the phenylacetic acid content.

Description

Technical field: [0001] The invention belongs to the technical field of chemical industry, and more specifically relates to a recovery process of phenylacetic acid. Background technique: [0002] Phenylacetic acid, also known as phenylacetic acid and benzyl formic acid, has the molecular formula C 6 h 5 CH 2 COOH, with a relative molecular weight of 136.15, is a glossy white flaky crystal in appearance, flammable and has a special smell. The melting point is 77°C. The boiling point is 265.5°C. The relative density is 1.228. Slightly soluble in cold water, easily soluble in ethanol, ether, acetone, sodium carbonate, chloroform, carbon tetrachloride and ammonia water. The chemical properties of phenylacetic acid are relatively active, and can react on the carboxyl group to form salts, esters, amides, etc., and can also undergo reactions such as nitration, halogenation, sulfonation, decarboxylation, oxidation, and reduction on the benzene ring or methylene hydrogen. It i...

AI Technical Summary

Problems solved by technology

Due to the complex composition of the waste liquid and the low content of phenylacetic acid, it is difficult to recycle it, and it is more difficult to realize recycling if it needs to meet a high quality standard

At present, some enterprises discharge phenylacetic acid together with the waste liquid, which not only pollutes the environment but also wastes a lot of resources

Although some enterprises have begun to recover phenylacetic acid, their production technology is backward, the product quality is poor, the production scale is small, and the production cost is high.

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