MUMBAI, India, Oct. 26 -- Intellectual Property India has published a patent application (202621107229 A) filed by Inventys Research Co Pvt Ltd on September 07, 2026, for A Process For The Purification Of 3,4-Dimethylpyrazole By Acidic Extraction, Neutralization, And Distillation.
Inventor includes Dr. Deepak Birewar.
The application for the patent was published on October 23, 2026, under issue no. 43/2026.
Abstract: ABSTRACT TITLE: A PROCESS FOR THE PURIFICATION OF 3,4-DIMETHYLPYRAZOLE BY ACIDIC EXTRACTION, NEUTRALIZATION, AND DISTILLATION Crude 3,4-dimethylpyrazole contaminated with 3-ethylpyrazole and other impurities is purified by (a) extraction at acidic pH with a halogenated organic solvent, preferably a haloarene such as chlorobenzene, whereby 3,4-dimethylpyrazole is selectively retained as its acid-addition salt in an acidic aqueous phase while impurities partition into the organic phase; (b) neutralization to liberate and recover the free-base pyrazole; and (c) distillation, which may be conventional batch distillation or wiped-film distillation. The process avoids isolation of any solid acid-addition salt by crystallization, gives yields generally above 90% and purities generally above 99%, is tolerant of substantial variation in crude feed composition, and has been demonstrated at scales from approximately 0.1 kg to at least 100 kg.
Disclaimer: Curated by HT Syndication.
