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Green and safe wastewater treatment method for methyl tin mercaptide

A technology of tin methyl mercaptide and wastewater treatment, which is applied in water/sewage treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., and can solve the problems of continuous processing and production of unfavorable products, mold release, and lubrication Poor performance, affecting the color of the product, etc., to achieve the effect of low water pretreatment requirements, high transparency, and good stability

Inactive Publication Date: 2016-09-28
ANHUI SHENGHUA XINAOTE CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Methyl tin (SM501) on the domestic market mainly contains 20% isooctyl methyl tin trimercaptoacetate and 80% isooctyl dimethyl tin dimercaptoacetate, and its tin content is 19.4, in actual During the processing, the methyl tin on the market will move from the inside of the product to the surface, and finally precipitate from the surface of the product, forming spots, which affects the fineness of the product. This is the so-called exudation (or sweating); In addition, in the process of processing, the batch material is easy to stick to the roller, and the mold release and lubricity are poor, which is not conducive to the continuous processing and production of the product
[0005] CN102503972B (2015-6-17) discloses a kind of methyl tin maleate and its preparation method, but how to prepare tin mercaptide stabilizer with reduced tin content and good thermal stability and environmental protection still needs to be improved

Method used

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  • Green and safe wastewater treatment method for methyl tin mercaptide
  • Green and safe wastewater treatment method for methyl tin mercaptide
  • Green and safe wastewater treatment method for methyl tin mercaptide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0117] The preparation method of green and safe tin methyl mercaptide comprises the following steps:

[0118] (1) Tinization: Put metal tin and catalyst into a pressure-resistant and acid-resistant reaction kettle, then pass in methyl chloride and heat and mix evenly at 150°C, carry out halogenation reaction for 0.2h, then add redistribution agent tin tetrachloride and Raise the temperature to 235°C, pressurize to 0.5MPa to carry out the tinning reaction for 1 hour, then distill and accept the fraction with a gas temperature within 150°C, and then absorb it with pure water to obtain an aqueous solution of methyl tin chloride;

[0119] The methyl alkene chloride comprises dimethyl tin dichloride and monomethyl tin trichloride; the first catalyst is a mixture of quaternary ammonium salt phase transfer catalyst and dimethyl sulfide according to the molar mass ratio of 1:2; The weight of the first catalyst accounts for 1% of the weight of metallic tin.

[0120] (2) Synthesis: Add...

Embodiment 2

[0129] The preparation method of green and safe tin methyl mercaptide comprises the following steps:

[0130] (1) Tinization: Put metal tin and catalyst into a pressure-resistant and acid-resistant reactor, then pass in methyl chloride, heat and mix evenly at 170°C, carry out halogenation reaction for 0.4h, then add redistribution agent tin tetrachloride and Raise the temperature to 235-245°C, pressurize to 0.5-0.8MPa to carry out the tinning reaction for 2 hours, then distill and accept the fraction whose gas temperature is within 230°C, and then absorb it with pure water to obtain an aqueous solution of methyl tin chloride;

[0131] Methyl alkene chloride comprises dimethyl tin dichloride and monomethyl tin trichloride; The first catalyst is a mixture of quaternary ammonium salt phase transfer catalyst and dimethyl sulfide according to the molar mass ratio of 1: 3; The weight of the first catalyst accounts for 3% of the weight of metallic tin.

[0132] (2) Synthesis: add th...

Embodiment 3

[0141] The preparation method of green and safe tin methyl mercaptide comprises the following steps:

[0142] (1) Tinization: Put metal tin and catalyst into a pressure-resistant and acid-resistant reaction kettle, then pass in methyl chloride and heat and mix evenly at 160°C, carry out halogenation reaction for 0.3h, then add redistribution agent tin tetrachloride and Raise the temperature to 240°C, pressurize to 0.6MPa to carry out the tinning reaction for 1.5 hours, then distill and accept the fraction whose gas temperature is within 200°C, and then absorb it with pure water to obtain an aqueous solution of methyl tin chloride;

[0143] The methyl alkene chloride comprises dimethyl tin dichloride and monomethyl tin trichloride; the first catalyst is a mixture of quaternary ammonium salt phase transfer catalyst and dimethyl sulfide according to the molar mass ratio of 1:2.5; The weight of the first catalyst accounts for 2% of the weight of metallic tin.

[0144] (2) Synthes...

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Abstract

The invention relates to a wastewater treatment method for organic tin substances, in particular to a green and safe wastewater treatment method for methyl tin mercaptide. The green and safe wastewater treatment method comprises the following steps: (1) performing tin mineralization; (2) synthesizing, namely, adding an obtained methyl tin chloride aqueous solution into isooctyl thioglycolate, adding a second catalyst, stirring for a reaction for 0.2-0.4 hour at 5-15 DEG C, further adding an alkali liquid, continuously stirring for a reaction till the pH value of the reaction system is 7-9, and heating to 60-70 DEG C for a reaction; (3) washing with water; (4) distilling. A process for treating wastewater generated in the preparation process comprises a carrier type membrane module filtering procedure and an activated carbon filter oil removing procedure. The process comprises the following steps: (1) feeding the wastewater into a carrier type membrane module via a circulation pump from a raw water tank; (2) implementing the carrier type membrane module filtering procedure in a cross flow filtration mode; (3) implementing the activated carbon filter oil removing procedure in a dead end filtration mode. The wastewater treatment method provided by the invention has the advantages of low cost and high treatment efficiency.

Description

technical field [0001] The invention relates to a wastewater treatment method for organotin substances, in particular to a green and safe wastewater treatment method for tin methyl mercaptide. Background technique [0002] There are many patents on the use of organotin compounds in PVC resin as stabilizers, such as US patents 3222317, 3396185, etc., mainly butyltin and octyltin, because propyltin has an odor, and ethyltin is poisonous and replaced. [0003] The main varieties of organotin are mono-alkyl tin, di-alkyl tin and tri-alkyl tin series, among which the tri-alkyl tin series is very toxic and cannot be used as a stabilizer; mono-alkyl tin has mono-methyl Tin, monobutyltin, monooctyltin, etc.; dialkyltin includes dimethyltin, dibutyltin, dioctyltin, etc. At present, the European Union has stipulated that the use of butyl tin and octyl tin series in PVC materials used in medical and food packaging is prohibited, while methyl tin series are still widely used in various...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/02C07F7/22C02F101/30
CPCC02F9/00B01D63/06B01D67/0039B01D69/12B01D71/021C02F1/283C02F1/44C02F2101/30C07F7/226
Inventor 李振杰杨立新焦健康宋建良
Owner ANHUI SHENGHUA XINAOTE CHEM CO LTD
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