Method for purifying polysulfide silane coupling agent byproduct salt

A silane coupling agent and polysulfide technology, which is applied in the field of purifying polysulfide silane coupling agent by-product salt, can solve the problem of no mature wastewater treatment process, etc., and achieve the effect of solving environmental protection problems

Active Publication Date: 2014-05-14
南京曙光精细化工有限公司
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Problems solved by technology

[0003] At present, there is no relevant report on the treatment of by-product brin

Method used

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Embodiment

[0017] Put 3m3 by-product brine of bis(propyltriethoxysilane) polysulfide into a 5000L stirred tank, add 30Kg of hydrogen peroxide with a mass fraction of 27.5% dropwise under stirring, keep the temperature of the reaction system below 90°C during the dropwise addition °C, after the dropwise addition, stir for 15 minutes until the reaction is complete, then stop stirring. Take about 50ml of the sample from the reaction system and pour it into the conical flask, drop 1 dropper cupric chloride solution into the sample with a 5mL disposable pipette, shake it to produce precipitation, then add hydrochloric acid dropwise until the sample is measured with a wide range of pH test paper If the precipitate does not dissolve, it means that the reaction is not complete. Continue to add hydrogen peroxide until the sulfur ion is completely oxidized; Is completely oxidized, the reaction has reached the end. The brine after the above treatment is passed through a filter press to remove impu...

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Abstract

The invention aims at providing a method for purifying a polysulfide silane coupling agent byproduct salt. The method comprises the following steps: A, oxidizing sulfur ions, namely, feeding the byproduct saline of a polysulfide silane coupling agent into a reaction device, and adding a hydrogen peroxide solution in the stirring state to completely convert sulfur ions in the byproduct silane into sulfate radicals; and B, performing a hot saltpeter removal method, namely, filtering to remove impurities in the treated silane, performing multiple-effect evaporation on the obtained clear liquid so as to obtain byproducts sodium chloride and sodium sulfate. Whether the oxidation desulphuration ions are completely reacted can be detected by using a lead acetate test paper detection method or a copper chloride color change method. By adopting the method, sulfur ions can be completely converted into sulfate radicals, a sulfate product can be separated from sodium chloride by using the hot saltpeter removal method, and sodium chloride with high purity can be obtained. The problems of environment friendliness and purification treatment on the byproduct salt sodium chloride are solved.

Description

technical field [0001] The invention relates to a method for purifying by-product salts of polysulfide silane coupling agents, which belongs to the technical field of chemical industry. Background technique [0002] In the water-phase production process of polysulfide silane coupling agent, there is a by-product sodium chloride, which is produced in the form of brine. Since organic chemical reactions cannot be 100% complete and some side reactions occur, some unreacted sulfide ions remain in the by-product brine. Once these sulfide ions come into contact with acidic environments, they will be converted into toxic and harmful gas hydrogen sulfide, which is harmful to the environment. Cause pollution, and may cause injury to personnel, and is not conducive to the further purification and transformation of by-product sodium chloride. [0003] At present, there is no relevant report on the treatment of the by-product brine in China, and there is no mature treatment process for ...

Claims

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Application Information

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IPC IPC(8): C01D3/14C01D5/02
Inventor 陶再山李春华王金勇刘兰香
Owner 南京曙光精细化工有限公司
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