A kind of method for concentrating and purifying low-cost thiourea solution

Abstract

The invention belongs to the field of solution concentration and purification and particularly relates to a low-cost concentration and purification method of a thiourea solution. By means of a molecule separation technology, the thiourea solution is effectively concentrated and purified by adjusting parameters of a molecule separation system. The molecule separation accuracy is optimized by adjusting operation parameters of the molecule separation system, and higher concentration multiple is obtained; compared with conventional evaporation concentration, no steam is used in the concentration and purification process, no phase change occurs to a solution system, no steam energy consumption is caused, and the method has the characteristics of low operation cost and the like.

Description

technical field

[0001] The invention belongs to the field of concentration and purification of solutions, in particular to a method for concentration and purification of a low-cost thiourea solution. Background technique

[0002] Thiourea is a white and shiny crystal with reducibility, soluble in water and ethanol when heated, it can be used as a raw material for the manufacture of medicines, dyes, resins, compression molding powder, etc., and is also used for vulcanization of rubber Accelerators, flotation agents for metal minerals, etc., are widely used in industry and medicine. The content of thiourea in the aqueous solution of thiourea is low, so it must be concentrated and purified, and then cooled to crystallize to obtain thiourea crystals. Traditionally, the method of evaporation and concentration is used to use the difference in the volatility of the solvent and the solute to obtain a favorable gas-liquid equilibrium condition to achieve the purpose of separation an...