Preparation method of thioacetic acid potassium

Abstract

This invention relates to a preparation method of thioacetic acid kalium. In existing method, hydrogen sulfide does not has plenary reaction, so utilization ratio is low, result in hydrogen sulfide dosage is large, cost high and three waste are too many, especially in exhaust gas, has serious pollution to environment. This invention uses ketene dimer and sodium polysulfide to inlet hydrogen sulfide gas to absolute alcohol solvent, add antioxidant, after completeness thio reaction, rectify to gain thioacetic acid and absolute alcohol solvent; add thioacetic acid or its hybrid with absolute alcohol solvent by distribution droplets to absolute alcohol solvent of potassium hydroxide, whipping, decompress and reclaim absolute alcohol solvent, and the precipitable white crystal is thioacetic acid kalium.

Description

technical field

[0001] The invention belongs to the field of organic chemistry, in particular to a preparation method of potassium thioacetate. Background technique

[0002] Potassium thioacetate is an important thio reagent in organic compound reactions, and has a wide range of uses. Organic.Syntheses, CV4, 928 describes the use of acetic anhydride to feed the required H under the condition of a small amount of sodium hydroxide. 2 S, then fast distillation to separate thioacetic acid and acetic acid from sodium salt, and then rectify and separate thioacetic acid with a yield of 72-76%. In the literature, acetic acid and phosphorus pentoxide, acetyl chloride and thiocyanate are also used Potassium sulfur, diacetyl sulfide hydrolysis, acetic anhydride and hydrogen sulfide react in acidic medium or under triethylamine and pyridine, and acetyl chloride and hydrogen sulfide react in the presence of aluminum trichloride, acetic anhydride and hydrogen sulfi...