Quality Control Method of Intermittent Vacuum Evaporation of Sodium Chloride Aqueous Solution

Abstract

The invention relates to a method for controlling the intermittent vacuum evaporation mass of a sodium chloride aqueous solution, which is mainly applied to the intermittent vacuum evaporation and concentration of the sodium chloride aqueous solution as well as crystallization process design, computer simulation and process control thereof, and belongs to the field of chemistry and chemical engineering evaporation and crystallization. The method for controlling the vacuum evaporation mass of the sodium chloride aqueous solution provided by the invention uses a numerical method to carry out design calculation mainly according to a novel evaporation model and a temperature difference model, so as to achieve the purpose of accurately controlling the water evaporation mass in the vacuum evaporation process of the sodium chloride aqueous solution; the method for controlling the intermittent vacuum evaporation mass of the sodium chloride aqueous solution has wide laboratory and industrial application prospect, is beneficial to the design and control of the evaporation, concentration and crystallization process of the sodium chloride aqueous solution, can be applied to the processes of waste water desalination, sea water desalination and sodium chloride industrial crystallization, and is in favor of the promotion of the technological level in the environmental protection and resourcerecycling and utilizing in China.

Description

technical field [0001] The invention relates to a method for controlling the water evaporation quality in the intermittent vacuum evaporation process of sodium chloride aqueous solution, and is of great significance to the design, computer simulation and control of the sodium chloride evaporation concentration and crystallization process. The invention can be used in waste water desalination, seawater desalination and salt industrial production process, and belongs to the field of evaporation and crystallization in chemical industry. Background technique [0002] As an important chemical raw material and food flavoring agent, sodium chloride is mainly produced by evaporative crystallization because its solubility in water changes little with temperature. Evaporation technology mainly includes traditional sun drying method and vacuum evaporation technology. Sea salt, lake salt and well salt with a long history are generally obtained by drying. However, the production of sod...

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Problems solved by technology

[0004] At present, the control of the evaporation rate of water quality in the industrial production process of sodium chloride is often based on the evaporation experience accumulated in a large number of small or pilot experiments. The control accuracy is often rough, which is not conducive to the production of high-quality sodium chloride products.

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