Method for generating polyvalent alcohol and formiate by extractive crystallization separating cannizzaro process

Abstract

The present invention relates to an extracted, crystalloid and separated Cannizzaros reaction to prepare polyatomic alcohol and formate. The steps are as follows: (1) Solution agent A is added into the mixture liquid between polyatomic alcohol and formate to form an oil phase of the extracting liquid; the formate together with the residual liquid is to form a water-phase of the extracted liquid; (2) the oil phase and the water phase of the extracted liquid are separated; (3) the water phase of the extracted liquid is crystallized and vaporized to obtain formate crystal; (4) the second solution agent B is added into the oil phase of the extracted liquid in step 2 so as to the polyatomic alcohol is separated out with a crystal mode in the mixture agent between A and B; (5) the solid phase of the polyatomic alcohol is separated from the mixture agent between A and B; (6) The mixing agent of A and B is distilled to separate out the solution agent A and the solution agent B; (7) the solid phase of the polyatomic alcohol is dried to recycle the mixing solution agent A and B left in the solid phase of polyatomic alcohol. The present invention is with much lower investment, shorter producing period, simpler operation, much better product quality and higher benefit.

Description

technical field [0001] The invention relates to a method for separating polyalcohol and formate formed by the Connizzaro method by extractive crystallization. It belongs to the field of organic chemical industry. Background technique [0002] Polyol products have a wide range of uses: they are an important class of organic chemical raw material intermediates, which are mainly used in the production of polyurethane foams, alkyd resin coatings and polyesters, as well as in the synthesis of lubricants, rosin esters, explosives, surface active It can also be used as the raw material for the production of solvents, solvents and plasticizers. It can also be used as a diffusion agent for resins, a textile solvent, a heat stabilizer for polyvinyl chloride resins, and the synthesis of various fine chemicals. [0003] At present, the methods for producing polyols such as trimethylolpropane and trimethylolethane mainly include the Connizzaro method. The Connizzaro method is an aldol ...

AI Technical Summary

Problems solved by technology

The ion exchange resin extraction method requires expensive anion and cation exchange resins; and in the production process, a large amount of acid and alkali are consumed to regenerate the exchange resin, and a large amount of waste liquid is generated to cause environmental pollution; the traditional cooling crystallization method has the following disadvantages: ①Requires low-temperature freezing source, which increases equipment investment and operating costs; ②Because of slow cooling and crystallization, the entire production process cycle is long, which is not conducive to industrial production; Product yield drops