Preparation method of dibutyltin dilaurate

Abstract

The invention discloses a preparation method of dibutyltin dilaurate. The preparation method comprises following steps: (1) adding dibutyltin dichloride and lauric acid into a reactor, and fully mixing dibutyltin dichloride and lauric acid; (2) dropwise adding a sodium hydroxide solution into the mixture of dibutyltin dichloride and lauric acid during the mixing process; (3) after the addition ofthe sodium hydroxide solution, fully carrying out reactions, and allowing the system to stand still to carry out layering; and (4) separating and discharging the upper layer namely dibutyltin dilaurate. The preparation method has the advantages that the heat generated by alkaline hydrolysis of dibutyltin dichloride is fully utilized, thus the energy consumption is effectively reduced, the synthesis cost is reduced, moreover, the salt content of generated wastewater in one step reaction is high, the wastewater is easy to process; a mixture of lauric acid and coconut acid is taken as the reaction raw material, has a low melting point, and is easy to feed in autumn and winter; the excess unreacted raw material is easy to separate, and the preparation cost is effectively reduced.

Description

technical field [0001] The invention relates to the synthesis of organotin, in particular to a preparation method of dibutyltin dilaurate. Background technique [0002] Dibutyltin dilaurate has excellent transparency, lubricity, and weather resistance. It is suitable for soft transparent PVC products. After processing, the surface gloss and transparency of the finished product are good, and there is no vulcanization pollution. With excellent light stability and transparency, it can be used as a stabilizer for polyvinyl chloride and is widely used. In the prior art, enterprises generally use dibutyltin dichloride to hydrolyze in caustic soda solution to obtain dibutyltin oxide and dehydration condensation with lauric acid to dibutyltin dilaurate. Finally, the product needs to be obtained through centrifugation. During the centrifugation process, a large amount of waste water will be generated, and the salt content in the waste water is low, the water volume is large, the tre...

AI Technical Summary

Problems solved by technology

Finally, the product needs to be obtained through centrifugation. During the centrifugation process, a large amount of waste water will be generated, and the salt content in the waste water is low, the water volume is large, the treatment cost is high, and the pre-reaction is a format reaction, and the toxic waste produced by step-by-step processing There is a lot of dust, there is a big safety hazard, and continuous heating is required during the reaction process, which wastes a lot of energy

Images