Acrylic acid production by gas-phase oxidation of 3C feedstock, involves work-up by condensation and vacuum-crystallization, recycling mother liquor and evaporated liquid to the condensation stage
Номер патента: DE19833049A1
Опубликовано: 27-01-2000
Автор(ы): Bernd Eck, Joachim Thiel, Joerg Heilek, Klaus Broellos, Otto Machhammer, Theo Proll, Volker Schliephake
Принадлежит: BASF SE
Опубликовано: 27-01-2000
Автор(ы): Bernd Eck, Joachim Thiel, Joerg Heilek, Klaus Broellos, Otto Machhammer, Theo Proll, Volker Schliephake
Принадлежит: BASF SE
Реферат: In a process for production of acrylic acid by catalytic gas-phase oxidation of a 3C feedstock, the gaseous product is worked up by condensation followed by crystallization of acrylic acid by evaporation under vacuum, both the mother liquor from crystallization and the evaporated solution being at least partly recycled to the condensation stage. The production of acrylic acid comprises: (a) catalytic gas-phase oxidation of 3C alkanes, alkenes, alkanols and/or alkanals and/or precursors thereof to acrylic acid, (b) condensation of the gaseous product mixture, (c) crystallization of acrylic acid by partial evaporation of the solution obtained under vacuum, (d) separation of the crystals from the mother liquor, (e) recycling at least part of the mother liquor from (d) to stage (b) and (f) recycling at least part of the evaporated solution from (c) to stage (b).
Method for heterogeneously catalysed partial gas-phase oxidation of propylene to acrylic acid
Номер патента: RU2462449C2. Автор: Клаус Йоахим МЮЛЛЕР-ЭНГЕЛЬ,Мартин ДИТЕРЛЕ,Йорг ХАЙЛЕК. Владелец: БАСФ СЕ. Дата публикации: 2012-09-27.