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

A solution concentration and solution technology, applied in the field of low-cost thiourea solution concentration and purification, can solve the problems of high operating cost and high steam energy consumption, and achieve the effect of low operating cost

Active Publication Date: 2017-10-10
SHANDONG EFIRM BIOCHEMISTRY & ENVIRONMENTAL PROTECTION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the deficiencies of the prior art, the present invention provides a method for concentrating and purifying a low-cost thiourea solution, which solves the problems of high steam energy consumption and high operating costs in the existing thiourea solution concentration process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The thiourea solution was pumped to a ceramic membrane filter for filtration, the flow rate of the solution was controlled to be 3.1m / s, and the clear liquid of the thiourea solution was collected. The collected thiourea solution clear liquid enters the molecular separation system under the action of the circulating pump, the flow rate of the thiourea solution clear liquid in the molecular separation system is controlled to be 1.0m / s, the inlet pressure of the molecular separation system is 0.2MPa, and the outlet pressure of the molecular separation system 0.1 MPa, the temperature of the clear solution of thiourea is 20°C, the clear liquid of the thiourea solution is circulated and separated in the molecular separation system, and the concentrated solution of thiourea is collected after the concentration and purification are completed, and the content of thiourea in the concentrated solution is equal to that of the raw material 2 times.

Embodiment 2

[0030] The thiourea solution was pumped to a ceramic membrane filter for filtration, the flow rate of the solution was controlled at 0.5 m / s, and the clear liquid of the thiourea solution was collected. The collected thiourea solution clear liquid enters the molecular separation system under the action of the circulating pump, the flow rate of the thiourea solution clear liquid in the molecular separation system is controlled to be 3.1m / s, the inlet pressure of the molecular separation system is 0.30MPa, and the outlet pressure of the molecular separation system is 0.24MPa, and the temperature of the thiourea solution clear liquid is 40°C. The thiourea solution clear liquid is circulated and separated in the molecular separation system, and the concentrated thiourea solution is collected after concentration and purification. 3.1 times.

Embodiment 3

[0032] The thiourea solution is pumped to a ceramic membrane filter for filtration, the flow velocity of the solution is controlled to be 3.5m / s, and the clear liquid of the thiourea solution is collected. The collected thiourea solution clear liquid enters the molecular separation system under the action of the circulating pump, the flow rate of the thiourea solution clear liquid in the molecular separation system is controlled to be 5.4m / s, the inlet pressure of the molecular separation system is 0.65MPa, and the outlet pressure of the molecular separation system is 0.33MPa, and the temperature of the thiourea solution clear liquid is 42°C. The thiourea solution clear liquid is circulated and separated in the molecular separation system, and the thiourea concentrated solution is collected after concentration and purification. 5.7 times.

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PUM

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C335/02
CPCC07C335/02
Inventor 梁万根张宁孙作龙杨聪毛锐章
Owner SHANDONG EFIRM BIOCHEMISTRY & ENVIRONMENTAL PROTECTION CO LTD
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