公开(公告)号：US20230391708A1

公开(公告)日：2023-12-07

申请号：US18032436

申请日：2021-11-05

申请人： LG Chem, Ltd.

发明人： Inho Choi ,  Hoiin Jeong ,  Yong O Im ,  Jiyoung Lee ,  Daeho Hong

IPC分类号： C07C51/377 ,  B01J27/18 ,  B01J35/02

CPC分类号： C07C51/377 ,  B01J27/1806 ,  B01J35/026 ,  B01J35/023

摘要： The present disclosure relates to a method for preparing acrylic acid, and more particularly, to a method for preparing acrylic acid by dehydrating a lactic acid molecule through different steps with different temperatures. According to the preparation method of the present disclosure, acrylic acid can be prepared from lactic acid with a high conversion rate and yield, and also energy consumption can be further reduced as compared with a conventional method.

公开(公告)号：US20230382842A1

公开(公告)日：2023-11-30

申请号：US18029809

申请日：2021-10-14

申请人： LG Chem, Ltd.

发明人： Yong O Im ,  Hoiin Jeong ,  Inho Choi ,  Jiyoung Lee ,  Daeho Hong

IPC分类号： C07C51/347 ,  B05B7/16

CPC分类号： C07C51/347 ,  B05B7/1613

摘要： The present disclosure relates to a method and an apparatus for vaporizing lactic acid. According to the method and apparatus, the content of lactic acid oligomers can be reduced within a short period of time, and the content of single-molecule lactic acid can be increased. The method includes heating and pressurizing a lactic acid aqueous solution, spraying a 1-1 stream of a liquid phase containing the heated and pressurized lactic acid aqueous solution, vaporizing the lactic acid contained in the 1-1 stream through spraying; and obtaining a 1-3 stream of a gas phase containing single-molecule lactic acid.