Content-adjustable methylhydrazine synthetic-fluid refining apparatus and method

Abstract

The invention relates to a content-adjustable methylhydrazine synthetic-fluid refining apparatus and a method. The apparatus comprises an evaporation rectification feeding tank, an evaporation heater, an evaporator, an evaporation rectifying column, a finished-product column, a reboiler and an automatic centrifuge, and is used to refining a methylhydrazine synthetic fluid. The benefits of the apparatus and the method comprises: the technological flow of refining methylhydrazine is improved, production energy consumption is substantially reduced; pollution is reduced; the methylhydrazine content in the refined methylhydrazine synthetic fluid can be adjusted in a larger scope; and the apparatus and the method are applicable to production of multiple methylhydrazine synthetic fluid with different methylhydrazine content, and help to realize continuous production and automatic control.

Description

technical field [0001] The invention belongs to chemical production equipment and methods, in particular to a device and method for refining methylhydrazine synthetic liquid with adjustable content. Background technique [0002] Methylhydrazine CH 3 NHNH 2 Also known as monomethylhydrazine, monomethylhydrazine, boiling point 87.5 ℃. The binary system composed of water has the highest constant boiling point. The azeotropic point under normal pressure was 107° C., the azeotropic composition was 0.267 (mol fraction), and the converted weight fraction was 0.482. The manufacture of the pure product of the traditional methylhydrazine aqueous solution is to obtain the pure product of methylhydrazine through steps such as separation, desalting, concentration, distillation, etc. The defect of the traditional manufacturing method is: [0003] Large energy consumption: In order to remove the salt and alkali in the methylhydrazine synthesis liquid, all the synthesis liquid is evapor...

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Problems solved by technology

[0003] Large energy consumption: In order to remove the salt and alkali in the methylhydrazine synthesis liquid, all the synthesis liquid is evaporated, and the liquid phase is evaporated into corresponding steam, consuming a large amount of heating steam, and then condensed into a liquid phase at about 30°C with cooling water , consumes a large amount of cooling water; then the liquid phase at about 30°C enters the dehydration distillation tower, changes from liquid phase to vapor phase, and then from vapor phase to liquid phase, so as to remove water; the concentrated methylhydrazine aqueous solution is added The caustic soda, which is close to its mass flow rate, enters the finished rectification tower again to complete the concentration of the methylhydrazine product with a mass concentration of 43%, which consumes a lot of energy; according to the analysis of actual production data, the energy consumption of rectification currently accounts for 50% of the cost of methylhydrazine

[0004] Serious pollution: After all the synthetic liquid is evaporated, the high-temperature solid phase flows into the open sedimentation tank for precipitation, and a large amount of methylhydrazine, water vapor, and part of monomethylamine are emitted into the atmosphere; there are NaCl and other seriously corrosive salts in the solid phase , the permeate can easily penetrate the wall of the sedimentation tank and pollute the groundwater

[0005] Serious material waste: the concentrated methylhydrazine aqueous solution is added with caustic soda close to its mass flow rate, and then enters the finished product rectification tower to complete the concentration of methylhydrazine product with a mass concentration of 43%. The caustic soda cannot be recycled , serious waste

[0006] Intermittent production, not continuous production

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