Method for recovering D-calcium pantothenate mother liquor

Abstract

The invention relates to a recovery method for D-calcium pantothenate mother liquor. The recovery method comprises the following steps: subjecting D-calcium pantothenate mother liquor to recovery of methanol; heating a product obtained after recovery of methanol, adjusting a pH value to 1-3, carrying out sufficient stirring, then performing cooling to room temperature, adjusting a pH value to 4-6,carrying out filtering, and respectively recovering precipitated calcium sulfate and a filtrate; adding ethyl acetate into the obtained filtrate, carrying out sufficient extracting, respectively collecting an ethyl acetate phase and a water phase, and recovering D-pantoic acid lactone in the ethyl acetate phase; and concentrating, cooling and crystallizing the obtained water phase, carrying out filtering and respectively recovering crystallized beta-aminopropionic acid and a filtrate containing D-calcium pantothenate. According to the method provided by the invention, the residual target products and a small amount of unreacted raw materials and auxiliary materials in the D-calcium pantothenate mother liquor are efficiently and fully recovered according to a specific sequence, so resourcewaste and environmental pollution are avoided; and the method has the advantages of easy availability of raw materials, environment-friendly and safe conditions, short reaction time, recyclable solvents, simple steps, high purity of recovered products and the like.

Description

technical field

[0001] The invention relates to the field of chemical production, in particular to a method for recovering D-calcium pantothenate mother liquor. Background technique

[0002] Calcium pantothenate is mainly used in medicine, food and feed additives. It is a component of coenzyme A. It participates in the metabolism of carbohydrates, fats and proteins. It is an indispensable trace substance for humans and animals to maintain normal physiological functions. More than 70% is used as feed additive. In recent years, my country's feed industry has developed rapidly, and the demand for calcium D-pantothenate has increased accordingly. The feed industry alone has a demand of no less than 30,000 tons per year. Therefore, the development prospects are very broad, with good domestic and foreign market prospects and extremely high economic returns.

[0003] According to relevant literature reports, the existing process of calcium pantothenate includes first splitting to...