Device and method used for removing organic impurities in by-product sodium chloride salt

Abstract

The invention belongs to the technical field of chemical technology and equipment, and relates to a device and a method used for removing organic impurities in by-product sodium chloride salt. The device comprises a high temperature oxidation reactor, a dissolving kettle A, a dissolving kettle B, a liquid phase deep oxidation tower, a liquid solid filter, a solid residue tank, and a nanofiltrationmembrane separator. The method comprises following steps: firstly, the multi-layer fluidized bed type high temperature oxidation reactor is used for high temperature oxidation of most organic impurities in by-product sodium chloride salt, then in the liquid phase deep oxidation tower, deep oxidation of residual trace amount organic impurities is carried out, and the nanofiltration membrane separator is adopted to remove the large molecular organic matter impurities further, so that requirements on organic matter impurities in sodium chloride raw material in ionic membrane caustic soda industrial device are satisfied. The device and the method are high in operation flexibility, and organic impurity processing efficiency is high.

Description

technical field [0001] The invention belongs to the technical field of chemical technology and equipment, and relates to a device and method for removing organic impurities in by-product sodium chloride salt. Background technique [0002] During the production process of organic chlorination industry, sodium chloride salt containing organic impurities will be produced by-product, and with the development of organic chlorination industry, the output of by-product sodium chloride salt is increasing, and with the new regulations of our country Introduced one after another, it has been classified as hazardous waste, and its supervision will be stricter. At the same time, the by-product sodium chloride salt will not be recycled, which will also cause a waste of resources. Therefore, the comprehensive utilization of by-product sodium chloride salt is inevitable. must do. The by-product sodium chloride salt is treated and purified as a raw material and returned to the salt chemica...

AI Technical Summary

Problems solved by technology

[0003] At present, the methods reported in the literature to treat sodium chloride salt containing organic impurities mainly include the following: one is the salt washing method, using water and detergent to remove impurities or other components in organic waste salt, but this method is only suitable for processing single, Waste salt with less impurity content; the second is the high-temperature treatment method, which decomposes the organic impurities in the salt into gas at high temperature, and then treats the gas to achieve the purpose of removing organic impurities, but in high-temperature treatment, nozzles are prone to appear problems such as blockage, wear, high-temperature bonding, stuttering, and equipment corrosion; the third is the high-temperature carbonization method, which carbonizes and decomposes organic waste salt at high temperature, so that the organic impurities in the waste salt are partially decomposed into volatile gases, and part of the coke becomes Organic carbon, but there are problems such as the carbonization temperature and the surface softening of the salt are not easy to control, and it is easy to form a bond to the carbonization equipment and affect continuous production.

In addition to the engineering problems in the above method, the final total carbon content in the treated sodium chloride is difficult to meet the quality requirements of ion-exchange membrane caustic soda for sodium chloride raw materials

Images