One-step synthesis method of sulfurized isobutylene

Abstract

The invention discloses a one-step synthesis method of sulfurized isobutylene, and belongs to the technical field of sulfide of acyclic unsaturated carbon skeletons. The one-step synthesis method comprises following steps: elemental sulfur and a catalyst are delivered into an autoclave, temperature is increased to 150 to 250 DEG C, stirring reaction is carried out for 0.5h, isobutylene is added into the autoclave slowly, pressure is increased to 2 to 10MPa, reaction is carried out for 1 to 8h, the temperature of an obtained product reduced to be lower than 80 DEG C via cooling, an obtained reaction mixture is taken out from the autoclave via pumping under the action of left pressure, is allowed to stand, and is subjected to layering so as to obtain an organic phase, and the organic phase is subjected to distillation and filtering so as to obtain finished product sulfurized isobutylene. The catalyst is an inorganic weak alkaline substance. The one-step synthesis method is high in yield, and low in cost; reaction is clean; and the problems in the prior art are solved.

Description

technical field [0001] The invention belongs to the technical field of sulfides of acyclic unsaturated carbon frame, and in particular relates to a synthesis process of one-step sulfurized isobutylene. Background technique [0002] Sulfurized isobutylene is an organic sulfur extreme pressure and anti-wear additive for lubricating oils. Due to its high sulfur content, extreme pressure and anti-wear properties, and good oil solubility, it is widely used in gear oils, metal additives and greases. The traditional synthesis of sulfurized isobutylene is mainly obtained by addition reaction of sulfur monochloride (S 2 Cl 2 ) and alkali metal (or alkaline earth metal sulfide) and isobutylene, sulfuration dechlorination reaction, and refined product. Addition reaction is the reaction of isobutene and sulfur monochloride in the presence of a catalyst at normal pressure and 0-50°C to obtain sulfur-chlorinated isobutylene adducts. The catalyst can be Lewis acid-methanol; sulfur dechlori...

AI Technical Summary

Problems solved by technology

[0003] The disadvantages of the traditional process method mainly lie in: 1) the production process is long, the process control is difficult, the product will have trace chlorine, which is difficult to remove, the conversion rate of raw materials is low, the production cost is high, and the price is expensive; 2) the dechlorination and refining process produce A large amount of waste water, waste residue, heavy pollution, difficult to handle, unfavorable to the environment; 3) Sulfurized olefin has a strong pungent smell