Device and method for concentrating and separating chemical products
A chemical product and separation device technology, applied in the field of chemical product concentration and separation devices, can solve the problems of complex operating system, high operation and management cost, low product yield, etc., and achieve the effects of low energy consumption, high concentration ratio and less waste water discharge
Inactive Publication Date: 2009-10-28
TIANJIN POLYTECHNIC UNIV
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[0005] At present, vacuum distillation is mostly used for the concentration of chemical products. However, this traditional treatment method not only has low product yield, but also has a complicated operating system and high operation and management costs.
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[0035] Sodium sulfide is a common chemical product. In its production process, a primary solution of 4-5wt% is obtained first.
[0036] As can be seen from Table 1, the solubility of sodium sulfide in water is highly dependent on the temperature of the solution, so the process of the present invention can be used to carry out concentrated crystallization of sodium sulfide.
[0037] Table 1 The relationship between the solubility of sodium sulfide in water and the temperature of the solution
[0038] temperature °C
[0039] Through the technological process of the present invention, the primary and secondary evaporation temperatures are controlled at 60° C., the vacuum degree is 0.095 MPa, the evaporation is concentrated to 25 wt%, and after cooling down to room temperature, the solid sodium sulfide crystalline product is directly obtained. At the same time, due to the use of vacuum evaporation, the hydrogen sulfide content in the product is low.
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The invention provides a device and a method for concentrating and separating chemical products. In the invention, stock solution enters a heating heat exchanger after boosting by a conveying pump, and the heated stock solution enters a tube pass of a primary hydrophobic hollow fiber membrane assembly for reducing and evaporating. Concentrated solution is distributed by a regulating valve, one part of concentrated solution backs to the tube pass of the primary hydrophobic hollow fiber membrane assembly for being continuously evaporated, and the other part of concentrated solution enters a tube pass of a secondary hydrophobic hollow fiber membrane assembly and a tube pass of a third hydrophobic hollow fiber membrane assembly for being continuously heated and evaporated, product solution is concentrated until approaching to the saturation concentration even the supersaturation concentration under the temperature and then is led into a cooler through a pipe for being cooled and crystallized. Steam is led into the cooler through a steam leading-out pipe of the membrane assembly for being liquefied, and then enters a steam and liquid separator. An on-line conductivity meter monitoring device monitors the operation condition and controls a valve to realize continuous production.
Description
technical field [0001] The invention relates to a device and method for concentrating and separating chemical products, in particular to a device and method for concentrating and separating chemical products using membrane distillation technology. Background technique [0002] Membrane distillation (MD) is a membrane separation process that uses a hydrophobic microporous membrane and uses the vapor pressure difference on both sides of the membrane as the driving force for mass transfer. This process is a separation process in which water vapor passes through a hydrophobic membrane from the heated raw water side and is condensed into a liquid state. Due to the hydrophobicity of the membrane, raw water and non-volatile solutes dissolved in it cannot pass through the membrane pores, so a vapor / liquid two-phase interface is formed at the membrane pores. The microporous hydrophobic membrane acts as a support shield for the two phases in the membrane distillation process. Compar...
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IPC IPC(8): B01D61/36
Inventor 吕晓龙
Owner TIANJIN POLYTECHNIC UNIV