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：DE3131440A1

公开(公告)日：1983-02-24

申请号：DE3131440

申请日：1981-08-07

Applicant: BASF AG

Inventor： HINSELMANN KLAUS DIPL ING ,  NAARMANN HERBERT DIPL CHEM DR ,  ECHTE ADOLF DIPL CHEM DR ,  HEIL EDUARD DIPL ING ,  NIKLES ALBERT DIPL ING ,  REFFERT RUDI WILHELM DIPL ING ,  HAMBRECHT JUERGEN DIPL CHEM DR

IPC: C08L7/00 ,  B29C35/00 ,  B29C45/00 ,  C08G65/46 ,  C08J3/00 ,  C08J3/20 ,  C08L21/00 ,  C08L23/00 ,  C08L33/00 ,  C08L33/02 ,  C08L71/00 ,  C08L71/12 ,  C08L101/00 ,  C08L71/04 ,  B01D1/26

Abstract: Molding materials containing high molecular weight polyphenylene ethers are produced by a process in which a solution of a polyphenylene ether in an organic solvent, together with another polymer, is freed of solvent by multi-stage evaporation. The solvent is preferably an aromatic compound from the class comprising the hydrocarbons, halohydrocarbons, ethers or esters, the ratio of the other polymer to the polyphenylene ether is advantageously from 99:1 to 20:80 parts by weight, the other polymer is, in particular, a homopolymer or copolymer of styrene or of a homolog thereof, which may be modified with rubber, and the multi-stage evaporation process preferably comprises not less than two and not more than four working up stages. The evaporation is carried out in general at from 120 DEG to 280 DEG C. and under a pressure of from 1 to 3,000 mbar, advantageously in the presence of assistants which reduce the partial pressure, eg. water and/or methanol.