A kind of production method of l (+) tartaric acid

Abstract

The invention discloses a method for producing an L (+) tartaric acid. The method for producing the L(+) tartaric acid comprises the following steps of: (1) adding cis-epoxy sodium bisuccinate into aqueous solution of frozen mother solution to prepare mixed solution, adjusting the pH value, and adding red rhodococcus to hydrolyze; (2) adding calcium sulfate to perform calcification, filtering to obtain L(+) calcium tartrate solid and calcified mother solution, freezing the calcified mother solution, performing centrifugal separation to obtain sodium sulfate decahydrate solid and frozen mother solution, and returning the frozen mother solution to the step (1); and (3) performing acidolysis on the L(+) calcium tartrate solid by using sulfuric acid, filtering to obtain aqueous solution of the L(+) tartaric acid, passing through cation and anion exchange resins sequentially, concentrating, crystallizing, separating and drying to obtain the L(+) tartaric acid. The calcified mother solution and calcium sulfate generated in the production process can be recycled, so the problem of environmental pollution is solved; and a small amount of product L(+) calcium tartrate dissolved in the calcified mother solution and unreacted cis-epoxy sodium bisuccinate are recovered, so the product yield is increased.

Description

technical field [0001] The invention relates to a production method of L(+) tartaric acid, which belongs to the technical field of biochemical industry. Background technique [0002] L(+)-tartaric acid is a natural organic acid, which has a high content in grapes. L(+)-tartaric acid can be used as one of the additives, flavor enhancers, and food coloring components of papaya. It is also an important raw material for primary industries. Many insoluble drugs can be processed into tartrate salts with excellent water solubility. In addition, it It is also widely used in cosmetics, wine making, construction, electroplating, leather making and other industries. In the early days, L(+)-tartaric acid was mainly extracted from tartar, a by-product of wine. Due to the limitation of raw materials, the output could not meet the demand. In recent years, the main production technology of L(+)-tartaric acid is to use microorganisms with cis-epoxysuccinate hydrolase to produce through enz...

AI Technical Summary

Problems solved by technology

This technology adopts the calcification of calcium chloride aqueous solution to produce a large amount of calcified mother liquor waste water to pollute the environment, and at the same time, the calcified mother liquor waste contains a small amount of product L(+) calcium tartrate and incompletely reacted cis-epoxysodium sodium succinate, which affects the product yield; and will Acid hydrolysis of L(+) calcium tartrate with sulfuric acid produces a large amount of calcium sulfate solid waste and also pollutes the environment

This route is not friendly to the environment due to the large and difficult-to-treat wastewater and waste solids, and has the disadvantage of low yield