公开(公告)号：DE3147323A1

公开(公告)日：1983-06-01

申请号：DE3147323

申请日：1981-11-28

Applicant: BASF AG

Inventor： FREY WALTER DIPL ING DR ,  STRAUB FERDINAND DIPL ING DR ,  SCHWETER WALTER DIPL CHEM DR ,  NIKLES ALBERT DIPL ING ,  HILPRECHT LUTZ DIPL ING DR ,  ENGLERT KURT

IPC: C07C5/327 ,  C07C5/333 ,  C07C15/46

Abstract: Process for the preparation of styrene by dehydrogenation of ethylbenzene in the presence of steam at elevated temperatures, in which the mixture of ethylbenzene and water to be fed into the reaction zone is evaporated and heated by means of the reaction mixture discharged from the reaction zone and water is evaporated at a pressure of 0.4 to 1.2 bar using the cooled reaction mixture, the vapour is compressed and brought to elevated temperatures, mixed with ethylbenzene and water, and the mixture is evaporated and fed into the reaction zone.

公开(公告)号：DE2449780A1

公开(公告)日：1976-04-29

申请号：DE2449780

申请日：1974-10-19

Applicant: BASF AG

Inventor： ENGELBACH HEINZ DIPL CHEM DR ,  KRABETZ RICHARD DIPL CHEM DR ,  DUEMBGEN GERD DIPL CHEM DR ,  WILLERSINN CARL-HEINZ DIPL CHE ,  FREY WALTER DIPL ING DR ,  LEBERT ULRICH DIPL CHEM DR ,  THIESSEN FRITZ DIPL CHEM DR

IPC: C07C51/00 ,  C07C51/44 ,  C07C51/48 ,  C07C57/07 ,  C07C67/00 ,  C07C57/04 ,  C07C51/32

Abstract: In the oxidation of propylene and/or acrolein, high-boiling or non-volatile byproducts are separated from the solvents used for absorbing the acrylic acid by treating the said solvents laden with byproducts with the hot reaction gases in such amounts that the major portion of the solvents evaporates, the residual solvent containing a high percentage of said byproducts then being discarded or worked up.