Process for the purification of thiophenes

US7994345B2 · kind B2 · utility

Assignee

• H.C. STARCK INC. · US

Inventors

• Lutz Brassat · Leverkusen, DE
• Stephan Kirchmeyer · Leverkusen, DE

Key dates

• Filing date: Jul 7, 2009
• Grant date: Aug 9, 2011
• Expiry date: Jul 7, 2029

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02E60/13
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The invention relates to a process for the purification of thiophenes by means of precipitation. The purified thiophenes are liquid at room temperature, have a purity of at least 99.50 wt. %, and are represented by the following general formula (I),wherein R1 and R2 independently of each other are, for example, a linear or branched C1-C20-alkyl group, or together form a fused C1-C20-dioxyalylene ring. The process involves: (I) precipitating the thiophene by cooling a solution of the thiophene and at least one solvent; or (II) precipitating the thiophene by adding the thiophene to a cooled solution of solvent and optionally the thiophene. The solutions are cooled to a temperature below the melting point of the thiophene.