Preparation method of methyl tin ethyl mercaptan stearate
A technology of ester methyl tin and thioethanol, which is applied in the field of preparation of methyl tin thioethanol stearate, can solve the problems of difficult recovery of valuable by-products from wastewater, waste of resources, and lower yields, and achieve the goal of manufacturing Low cost, stable product quality, and little harm
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Embodiment 1
[0020] Put 2395kg of mercaptoethanol stearate into the reaction kettle, heat and stir the mixture, when the temperature reaches 55°C, start to drop methyl tin chloride aqueous solution and ammonia water, and adjust the acidity of the reaction system between 2 and 5; maintain Reaction system temperature and the stability of acidity, continue dripping methyl tin chloride aqueous solution and ammoniacal liquor, when dropping into the monomethyl tin trichloride aqueous solution 1200kg of mass concentration 45%, stop dripping ammoniacal liquor, leave standstill phase separation; The phase was washed with water at 60°C, and then stood still to separate the phases; the organic matter was distilled under reduced pressure at a temperature between 60°C and 90°C to remove water and other low-boiling impurities, and then filtered, cooled, and shaped to obtain the following: image 3 The pure product 2572kg of the trithioethanol stearate monomethyl tin of shown structure. The yield is 98.2...
Embodiment 2
[0025] Put 1777kg of mercaptoethanol stearate into the reaction kettle, heat and stir the mixture, when the temperature reaches 65°C, start to add methyltin chloride aqueous solution and ammonia water dropwise, and adjust the acidity of the reaction system between 2 and 5; maintain Reaction system temperature and the stability of acidity, continue dripping methyl tin chloride aqueous solution and ammoniacal liquor, when dropping into the dimethyl tin dichloride aqueous solution 1000kg of mass concentration 55%, stop dripping ammoniacal liquor, leave standstill phase separation; The phase was washed with water at 50°C, and then stood still to separate the phases; the organic matter was distilled under reduced pressure at a temperature between 90°C and 100°C to remove water and other low-boiling impurities, and then filtered, cooled, and shaped to obtain the following: image 3 The pure product 2089kg of the dithioethanol stearate dimethyl tin of shown structure. The yield is 99...
Embodiment 3
[0030] Put 1308kg of mercaptoethanol stearate into the reaction kettle, heat and stir the mixture, when the temperature reaches 60°C, start to add methyl tin chloride aqueous solution and ammonia water dropwise, and adjust the acidity of the reaction system between 2 and 5; maintain Reaction system temperature and the stability of acidity, continue to drop methyl tin chloride aqueous solution and ammoniacal liquor, when dropping into 800kg methyl tin chloride aqueous solution (the mass concentration of dimethyl tin dichloride is 30%, monomethyl trichloride When the mass concentration of tin is 15%), stop dripping ammonia water, and stand for phase separation; get the organic phase and wash it with water at 70°C, then stand for phase separation; the organic matter is distilled under reduced pressure at a temperature between 95°C and 105°C to remove water Wait for the low-boiling point impurities, then filter, cool, and shape to obtain 1477kg of the mixture of dithioethanol stear...
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