Evaporation recovery process of methanol aqueous solution of sodium chloride

A methanol aqueous solution and sodium chloride technology, applied in the field of sodium chloride methanol aqueous solution evaporation recovery process, can solve the problems of increased burden, large amount of steam to be generated, and reduced methanol recovery rate, so as to reduce labor force and improve production efficiency Effect

Active Publication Date: 2019-06-28
JIANGSU MYANDE ENERGY SAVING EVAPORATION EQUIP CO LTD
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AI Technical Summary

Problems solved by technology

A part of methanol will be entrained in the raffinate, causing loss and reducing the recovery rate of methanol; at the same time, sodium chloride is not recycled, which increases the burden of subsequent treatment
In addition, distillation in the tower still requires a large amount of steam and high energy consumption

Method used

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  • Evaporation recovery process of methanol aqueous solution of sodium chloride

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Embodiment Construction

[0018] Such as figure 1As shown, the methanol aqueous solution evaporation recovery process of sodium chloride of the present invention comprises the following steps successively: (1) the methanol aqueous solution stock solution of new sodium chloride in the stock solution storage tank T1 is sent into the preheating unit by the feed pump B1 to carry out preheating and temperature rise ; (2) In the first-effect falling film evaporator 1, raw steam is used to heat, evaporate and concentrate the preheated stock solution to make it a first-effect concentrated solution, and methanol and water in the stock solution evaporate to produce first-effect steam; (3) In the second-effect drop In the membrane evaporator 3, the first-effect steam is used to further heat, evaporate and concentrate the first-effect concentrated liquid to make it into a second-effect concentrated liquid, and the methanol and water in the first-effect concentrated liquid continue to evaporate to generate the secon...

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Abstract

The invention relates to an evaporation and recycling process of a methanol water solution of sodium chloride. The evaporation and recycling process sequentially comprises the following steps: (1) pre-heating a new raw solution for raising the temperature; (2) heating and evaporating the raw solution by utilizing fresh steam in a single-effect falling-film evaporator to form a single-effect concentrated solution, and evaporating methanol and moisture to generate single-effect steam; (3) in a double-effect falling-film evaporator, heating and evaporating the single-effect steam by utilizing the single-effect concentrated solution to obtain a double-effect concentrated solution, and generating double-effect steam; (4) in a three-effect forced circulating evaporation and crystallization unit, heating the double-effect concentrated solution by utilizing the double-effect steam to form three-effect crystal slurry, and generating three-effect steam; (5) enabling the three-effect crystal slurry to enter a three-effect hydrocyclone for concentrating and thickening, returning a light phase back to the three-effect forced circulating evaporation and crystallization unit for circulating, and conveying a heavy phase into a thick tank for concentrating and thickening; and (6) conveying the heavy phase of the thick tank into a centrifuge for separating, discharging sodium chloride crystals from a solid-phase outlet of the centrifuge, and conveying a mother solution into a mother solution tank. The process is low in energy consumption and can realize complete recycling of sodium chloride and methanol.

Description

technical field [0001] The invention relates to a methanol aqueous solution evaporation recovery process of sodium chloride, which can be applied to the treatment of methanol aqueous solution with high sodium chloride in the environmental protection industry and the recovery of methanol in the food and pharmaceutical industry, and belongs to the technical field of industrial water treatment. Background technique [0002] In the environmental protection and pharmaceutical industries, due to the diversity of the chemical industry, the solution components are becoming more and more complex, mostly with high salt content and high organic matter. The methanol aqueous solution of sodium chloride is usually recovered by rectification process. After separation by rectification, Methanol overflows, and sodium chloride remains in the tower kettle, and the tower kettle needs to be regularly drained. A part of methanol will be entrained in the raffinate, causing losses and reducing the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C29/76C07C31/04C01D3/04
CPCC01D3/04C07C29/76C07C31/04
Inventor 杨杰许亮尹璐王晓克孙利敏孙孝天
Owner JIANGSU MYANDE ENERGY SAVING EVAPORATION EQUIP CO LTD
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