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
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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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