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Application of MVR (mechanical vapor recompression) crystallizing evaporator in sodium sulfate and sodium chloride separation technology

An evaporator, sodium sulfate technology, applied in the purification of alkali metal chloride, alkali metal sulfite/sulfate, alkali metal halide purification, etc., can solve the problems of complex operation, waste residue, waste gas discharge, long process flow, etc.

Inactive Publication Date: 2013-06-26
NAFINE CHEMICAL INDUSTRY GROUP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The five-effect high-temperature production of sodium sulfate and the three-effect low-temperature production of sodium chloride are generally used in the co-production of salt and nitrate. The process is long, complicated in operation, high in personnel costs, high in product costs, and has waste residue and waste gas discharge.

Method used

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  • Application of MVR (mechanical vapor recompression) crystallizing evaporator in sodium sulfate and sodium chloride separation technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0007] Example 2 Pump 20 tons of nitric solution containing 16% sodium sulfate and 15% sodium chloride (by mass percentage) into the MVR crystallization evaporator for concentration: heat the nitric solution to 98°C, pump it into the crystallization evaporator, and start The compressor starts to evaporate, and when the nitric solution is concentrated to the supersaturated state of sodium sulfate, it is pumped into the crystallizer to begin to discharge the sodium sulfate material. The nitric solution is pumped into the crystallization evaporator to be heated and evaporated, and the secondary steam cooling water passes through the heat exchanger to preheat the nitric liquid. When the concentration of sodium sulfate in the nitric solution reaches 5.5%, the concentrated mother liquor I is lowered to 50°C through the heat exchanger, then pumped and transported to the MVR crystallization evaporator for concentration, and the compressor is started for evaporation. When the concentrat...

Embodiment 3

[0008] Example 3 720,000 tons of nitric acid solution containing 14% sodium sulfate and 14% sodium chloride (by mass percentage) in Huaian, Jiangsu, was pumped into the MVR crystallization evaporator for concentration: the nitric acid solution was heated to 95°C and pumped into the crystallization evaporator , start the compressor and start evaporating. When the nitric solution is concentrated until the sodium sulfate is supersaturated, it is pumped into the crystallizer to start discharging the sodium sulfate material. The nitric solution is pumped into the crystallization evaporator to be heated and evaporated, and the secondary steam cooling water passes through the heat exchanger to preheat the nitric liquid. When the concentration of sodium sulfate in the mother liquor Ⅰ reaches 5.5%, the concentrated mother liquor Ⅰ is lowered to 50°C through the heat exchanger, then pumped and transported to the MVR crystallization evaporator for concentration, and the compressor is sta...

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Abstract

The invention discloses an industrial application of an MVR (mechanical vapor recompression) crystallizing evaporator technology in the production of sodium sulfate and sodium chloride in Huaian, Jiangsu, and relates to an improvement of a salt and sodium sulfate coproduction evaporation technology, belonging to the technical field of chemical three-waste treatment and utilization, and in particular to an application of an MVR crystallizing evaporator in a sodium sulfate and sodium chloride separation technology. The application is mainly technically characterized in that sodium sulfate liquid is concentrated by the MVR crystallizing evaporator, the sodium sulfate is produced at high temperature, and the sodium chloride is produced at low temperature. According to the invention, the mechanical re-compressed vapor is evaporated, concentrated and crystallized at 90-100 DEG C to obtain sodium sulfate, and the re-compressed vapor at a low temperature of 55 DEG C is concentrated and crystallized to obtain sodium chloride. According to the invention, the application of the MVR technology to the concentration of sodium sulfate liquid is realized, the sodium sulfate is produced at high temperature, and sodium chloride is produced at low temperature. The application disclosed by the invention is an environmental protection project which saves energy, reduces emission and avoids waste gas, waste water and waste residue.

Description

technical field [0001] The invention belongs to the technical field of energy saving and emission reduction, and specifically relates to the application of an MVR crystallization evaporator in the separation process of sodium sulfate and sodium chloride. Background technique [0002] The five-effect high-temperature production of sodium sulfate and the three-effect low-temperature production of sodium chloride are commonly used in salt and nitrate co-production. This process is long, complex in operation, high in personnel costs, high in product costs, and has waste residue and waste gas discharge. The invention adopts the MVR crystallization evaporator to produce sodium sulfate at high temperature and sodium chloride at low temperature. The process has the advantages of short flow, simple operation, low personnel cost, low product cost, and no waste gas, waste residue and waste water discharge. It is a new technology to replace the five-effect high-temperature production of...

Claims

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Application Information

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IPC IPC(8): C01D3/04C01D3/14C01D5/16
Inventor 许涛程芳琴周新国荆小兵李胜苏刚
Owner NAFINE CHEMICAL INDUSTRY GROUP CO LTD
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