Process for the purification of thiophenes

Details Process for the purification of thiophenes Process for the purification of thiophenes

2011-08-09

2011-08-09

Nolan, Jason M (Department: 1626)

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C549S029000

Reexamination Certificate

active

07994345

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 R1and R2independently 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.

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