PROCESS FOR ENRICHING ENANTIOMERS FROM AN ENANTIOMER MIXTURE

    公开(公告)号:US20200039904A1

    公开(公告)日:2020-02-06

    申请号:US16338633

    申请日:2017-10-05

    申请人: BASF SE

    IPC分类号: C07C29/17 C07C29/78 B01D9/00

    摘要: The present invention relates to a process for enriching enantiomers from an enantiomer mixture by a fractionating melt crystallization in a melt crystallization apparatus. The invention specifically relates to a process for producing an enantiomer-enriched chiral terpene, in particular of D/L-Isopulegol. The process comprises: i) a crystallization step to obtain a crystallizate and a mother melt and removal of the mother melt from the crystallizate to afford a mother melt fraction; ii) sweating of the crystallizate obtained in step i) to afford a molten sweating fraction and iii) subsequent melting of the sweated crystallizate to afford a molten crystallizate fraction, wherein the optical rotation at least of the sweating fraction is determined online using a polarimeter and the changeover from step ii) to step iii) is controlled online by means of at least one control unit.