4 results about "MONOCHLOROACETIC ACID" patented technology

The present application relates to a kind of preparation method of trifluoromethyl pyrazole compound, belong to the technical field of organic synthesis.The specific method is: (1) trifluoroacetyl ethyl acetate is first with hydrazine hydrate cyclization reaction and generates compound of formula III;(2) under the catalysis of base, compound of formula III is reacted with difluoromethylation reagent and generates compound of formula II;(3) compound of formula II is reacted with methylating agent and obtains compound of formula I;The difluoromethylation reagent is difluoro-monochloromethane or sodium difluoro-monochloroacetate;The methylating agent is chloromethane, bromomethane, iodomethane, dimethyl sulfate or dimethyl carbonate.The present application is prepared by changing reaction route, and the higher-priced raw material methylhydrazine is replaced, and isomer impurity is no longer generated in the product prepared.Not only raw material cost is reduced, but also the purity of product is improved.

An improved method of producing monochloroacetic acid (MCAA) is disclosed, which affords a colorless monochloroacetic acid product in any form that can be obtained by this method.

Topical formulations comprising peroxyacids prepared in situ from trichloroacetic acid, dichloroacetic acid, monochloroacetic acid or acetic acid and hydrogen peroxide are useful for promoting hair growth and for preventing hair loss.

The present disclosure relates to the technical field of chloroacetic acid tail gas treatment, and one embodiment of the present disclosure provides a processing device for monochloroacetic acid synthesis tail gas, which comprises a first acetic acid absorption tower, a second acetic acid absorption tower, a third acetic acid absorption tower and a gas inlet pipeline, and further comprises heat preservation covers, sun protection covers, fixing mechanisms, heat preservation and sun protection mechanisms and connecting mechanisms, two heat preservation covers are movably sleeved on the first acetic acid absorption tower, the second acetic acid absorption tower and the third acetic acid absorption tower, and the sun protection covers are installed on the outer sides of the heat preservation covers. Through the above technical solution, the technical problem that the tail gas inlet pipeline and the acetic acid recovery tower in the processing device for monochloroacetic acid synthesis tail gas lack effective heat preservation and sun protection structures in the prior art, so that the temperature inside the tail gas inlet pipeline and the acetic acid recovery tower is affected by the outside world and rises, the tail gas is greatly lost when the air temperature is high, and the tail gas is easily greatly lost, thereby affecting the recovery efficiency of acetic acid is solved.