Processes for producing succinic acid

摘要

Provided are processes for producing high-purity succinic acid from a succinic-acid-containing liquid through crystallization.

主权项

1. A process for producing succinic acid, the process comprising:
feeding a succinic-acid-containing liquid continuously or intermittently to a crystallization tank, crystallizing succinic acid from the succinic-acid-containing liquid in the crystallization tank, to obtain crystallized succinic acid, and discharging the crystallized succinic acid continuously or intermittently from the crystallization tank, wherein: the feeding and the discharging are performed so as to keep a liquid level of the crystallization tank within a given range; in the crystallizing, seed crystals of succinic acid are introduced continuously or intermittently into the crystallization tank; and the seed crystals comprise crystals obtained by pulverizing at least a part of the crystallized succinic acid that has been discharged from the crystallization tank.