Method for continuously producing ethylene sulfide

Abstract

The invention provides a method for continuously producing ethylene sulfide. The method comprises the following steps of: forming a substrate; continuously adding ethylene carbonate and thiocyanate into a continuous reactor of which the temperature is controlled to be 90-140 DEG C; carrying out a reaction to generate ethylene sulfide and cyanate under the stirring action, continuously dischargingthe generated ethylene sulfide from a gas outlet of the reactor, and carrying out condensation and separation to obtain liquid ethylene sulfide, and continuously discharging the generated cyanate fromthe bottom of the reactor. Through continuous reaction, an intermittent kettle type reaction in the prior art is improved into a continuous reactor, raw materials instantaneously react at the reaction temperature, generated epithioethane is rapidly separated from other substances, and generated cyanate powder is discharged from the bottom of the reactor under the action of gravity and screw propulsion of a stirrer by a wall scraping screw. The method is clean, pollution-free, stable in production index, low in labor consumption and beneficial to industrial scale-up production.

Description

technical field

[0001] The invention relates to a method for continuous production of ethylene sulfide. Background technique

[0002] At present, the mainstream process route for domestic production of diethylaminoethanethiol is to react ethylene carbonate with thiocyanate to generate ethylene thiolane, and then react diethylamine with thiolane to generate diethylaminoethanethiol.

[0003] The two patents CN201710497589 and CN201710497588 both made the same improvement on the method of preparing sulfide. The method of intermittent feeding was adopted to increase the yield of sulfide by controlling the reaction speed and effectively separating the product from carbon dioxide. Batch reaction to produce thiocyanate is the reaction of ethylene carbonate and thiocyanate to generate thiocyanate. During the reaction, ethylene carbonate is liquid, thiocyanate is solid, and ethylene carbonate is both a reaction raw material and a solvent. Phase, the thiocyanate is fully mixed with i...

Images