A device for removing organic impurities in by-product sodium chloride salt in a chlorination process

Abstract

The invention belongs to the technical field of chemical equipment, and relates to a device for removing organic impurities in sodium chloride salt, a by-product of the chlorination process, which includes a high-temperature oxidation reactor, a dissolution kettle A, a dissolution kettle B, and a liquid-phase deep oxidation tower connected in sequence , liquid-solid filter, solid slag tank, and fine filter. First, the majority of organic impurities in the by-product sodium chloride salt are oxidized at high temperature through a multi-layer fluidized bed high-temperature oxidation reactor, and then in the liquid phase deep oxidation tower Deeply oxidize the remaining trace organic impurities, and then further remove the macromolecular organic impurities through the nanofiltration membrane separator, so as to meet the requirements of the ion membrane caustic soda industrial device for the organic impurities in the raw material of sodium chloride. The invention provides The device has the characteristics of large operating flexibility and high efficiency in the treatment of organic impurities.

Description

technical field [0001] The invention belongs to the technical field of chemical equipment, and relates to a device for removing organic impurities in sodium chloride salt, a by-product of the chlorination process. 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 sodium chloride salt is imperative. . The by-product sodium chloride salt is treated and purified as a raw material and returned to the salt chemical production ...

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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 by-product salt into gas at high temperature, and then treats the gas to achieve the purpose of removing organic impurities, but in high-temperature treatment, it is easy to Problems such as nozzle clogging, wear, high-temperature adhesion, stuttering, and equipment corrosion occur; 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 some Coking 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 adhesion 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

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