Synergic reagent for separating glycolic acid from water solution containing inorganic salt and uses thereof

Abstract

The invention discloses a synergistic extract for separating glycollic acid from water solution with inorganic salt and the application, the components and the volume percentage are as follows: trioctylamine 30 to 70%, tributyl phosphate 5 to 30%, coal oil 5 to 40%, and octanol 5 to 40%. The synergistic extract has the advantages of excellent extraction and stripping separation performance for glycollic acid, good effect, less liability to emulsification, and low extractant loss.

Description

technical field [0001] The invention relates to an extractant, in particular to a cooperative extractant for separating glycolic acid from an aqueous solution of inorganic salts by a solvent extraction method. Background technique [0002] Glycolic acid, also known as glycolic acid, is a very important fine chemical intermediate, which can be widely used in the surface cleaning of metal materials, cleaning of supercritical high-pressure boilers, preparation of high-end cosmetics and biodegradable polymer materials and medical medicine materials etc. [0003] At present, most of the domestic production of glycolic acid is still using the alkaline hydrolysis route of chloroacetic acid and sodium hydroxide. The product glycolic acid produced by this route has a high chlorine content, and chloride ions are highly corrosive to metal materials, which limits the application of this method. scope. [0004] Hydroxyacetonitrile is hydrolyzed under the action of inorganic acids, such...

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Problems solved by technology

[0005] Chinese patent CN1066650A discloses a hydrolysis reaction of hydroxyacetonitrile under the action of sulfuric acid, phosphoric acid, sulfurous acid, hydrochloric acid and their mixtures to prepare an aqueous solution of glycolic acid containing inorganic salts, and then the solution is made of trioctylamine, dimethyl A mixed extractant composed of sulfoxide and diethyl ketone, or a mixed extractant composed of tributyl phosphate, dialkyl methylphosphonate and diethyl propyl ether, or a mixed extractant composed of trioctylphosphine oxide and Carry out liquid-liquid extraction and separation in the mixed extractant that sulfonated kerosene forms, can obtain the glycolic acid aqueous solution of 41~53.4% ​​content, the shortcoming of this method is: (1) the ethers of the low alkane chain used are as extractant, and low Alkyl chain ethers are prone to produce peroxides during use, and peroxides have the danger of explosion and combustion; (2) the main extractant trioctylphosphine oxide used is extremely expensive; (3) the extraction process is time-consuming Too long, the resulting glycolic acid product aqueous solution concentration is also too low

Chinese patents CN1032689C and CN1032688C respectively report the use of an organic extractant composed of N235, octanol and kerosene and composed of TBP or TRPO, octanol and kerosene from an aqueous solution containing an inorganic acid and its salt, or an aqueous solution of an organic acid and its salt Glycolic acid is extracted and separated from medium, but this process technology is aimed at the separation of dilute p-glycolic acid solution. If the content of glycolic acid is required to be lower than 150g / L, then when pure water is used as the stripping agent, the concentration of glycolic acid in the organic phase will decrease. After reaching 40g / L, it is difficult to further decrease