process to produce succinic acid

processes for producing succinic acid. These are processes for producing high purity succinic acid from a liquid containing succinic acid by crystallization. The invention relates to a process for producing succinic acid comprising crystallizing succinic acid from a stirred succinic acid-containing liquid in a crystallization tank equipped with a stirrer, where a power required for stirring per unit volume of the succinic acid-containing liquid in the crystallization tank is 0.4 to 3 kw / m ^ 3 ^, and a process for producing succinic acid comprising crystallizing succinic acid from a succinic acid-containing liquid in a crystallization tank, where the The process comprises a crystallization step in which the crystallized succinic acid is discarded continuously or intermediate from the crystallization tank and a liquid containing succinic acid is continuously or intermittently fed to the crystallization tank to maintain the liquid level of the crystallization tank. within a given range.