Method for purifying byproduct saline water of polysulfide silane coupling agent

A technology of silane coupling agent and polysulfide, which is applied in the field of purifying brine by-product of polysulfide silane coupling agent, can solve the problem of viscous organic matter in brine, achieve high processing speed, stable and continuous production, and reduce clogging problem effect

Active Publication Date: 2018-08-31
南京曙光新材料有限公司
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Problems solved by technology

[0003] The object of the present invention is to provide a method for purifying the by-product brine of polysulfide silane coupling agent in view of the above-mentioned problems, solve the problem of viscous organic matter in the purified brine, and provide stable quality for the next step of distilling brine. And the brine with good fluidity improves the continuity and production efficiency of brine treatment, and provides a supporting environmental protection treatment plan for the continuous and stable production of polysulfide silane coupling agents

Method used

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Embodiment

[0030] Removal of sulfur ions: Put 3m³ of by-product brine of polysulfide silane coupling agent into a 5000L stirred tank, add 27% aqueous hydrogen peroxide dropwise under stirring until the reaction is complete, and 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 pH < 4, if the precipitate does not dissolve, indicating 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.

[0031] Hydrolyzed polysulfide silane coupling agent: under stirring, add 31% hydrochloric acid dropwise to the reaction kettle until the pH of the solution is <2, and the solid in the solution is granular rather tha...

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Abstract

The invention provides a method for purifying byproduct saline water of a polysulfide silane coupling agent. The method comprises steps as follows: a, sulfur ion removal: the byproduct saline water ofthe polysulfide silane coupling agent is added to a reaction device, and a hydrogen peroxide water solution is dropwise added in a stirring state until complete reaction is completed; b, hydrolysis of the polysulfide silane coupling agent: hydrochloric acid is dropwise added to the solution completing complete reaction until the pH of the solution is not larger than 2, and the polysulfide silanecoupling agent is turned into granular solids; c, neutralization: liquid caustic soda is added to the solution reacting in the step b for neutralization until the pH of the solution ranges from 7 to 9; d, solid removal: solids are removed from a product obtained after a neutralization reaction in the step c through an over-press filter, and filtrate enters the next procedure; e, distillation: thefiltrate formed in the step d enters a multi-effect evaporation system and salt and water are separated; f, water recycling: water separated from the step e is prepared into 31% byproduct hydrochloricacid and 30% liquid caustic soda. The continuity for saline water treatment and the production efficiency are improved.

Description

Technical field: [0001] The invention relates to a method for purifying brine by-produced by polysulfide silane coupling agents, and belongs to the technical field of chemical industry. Background technique: [0002] In the water phase production process of polysulfide silane coupling agent, sodium chloride is formed as a by-product. When the organic phase polysulfide silane coupling agent is separated from the water phase, sodium chloride is separated in the form of aqueous phase of brine . Since the organic chemical reaction cannot be 100% complete and the two phases cannot be 100% separated, there will be a small amount of polysulfide silane coupling agent suspended in the water phase in the form of droplets. If the polysulfide silane coupling agent is not removed from the water phase, it will inevitably have an adverse effect on the next step of the water phase's environmental protection treatment. At present, there is a process for removing residual sulfide ions in br...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D3/14C01D3/16
CPCC01D3/14C01D3/16
Inventor 陶再山李春华
Owner 南京曙光新材料有限公司
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