Basf Se Corporation

Lukas Schulz

Yong Liang Liu

Ulrich Hammon

Klaus Joachim Mueller-Engel

Christian Walsdorff

Signe Unverricht

Nicolai Tonio Woerz

Marco Hartmann

Michael Ludwik Lejkowski

Tim Blaschke

Johannes Lieberknecht

Nicole Holub

Daniel Pfeiffer

Michael Bender

Till Christian Brueggemann

Frank Huetten

Andreas Weickgenannt

Feelly Ruether

Pawel Czajka

Kazuhiko Amakawa

Marta Porta Garcia

Oliver Christian Gobin

Michael Hübner

Yan Li

The present invention related to a column for the thermal treatment of a mixture of compounds having a tendency to polymerization, as well as a thermal separating process using the column. The column includes a mass transfer tray having a rising tube with an inlet opening below the tray and an outlet opening above the tray. The rising tube further includes a lateral opening above and close to the upper surface of the mass transfer tray. The rising tube forms a fountain spray of atomized liquid from the mixture of compounds above the tray that enter the rising tube through the lateral opening. The fountain is sprayed to a spot of the inner surface of the column where polymerization is likely to occur.

Column for thermal treatment of a mixture of compounds having a tendency to polymerization

The present invention relates to a process for preparing cyclohexane from methylcyclopentane (MCP) and benzene. In the context of the present invention, MCP and benzene are constituents of a hydrocarbon mixture (HM1) additionally comprising dimethylpentanes (DMP), possibly cyclohexane and possibly at least one compound (low boiler) selected from acyclic C-C-alkanes and cyclopentane. First of all, benzene is converted in a hydrogenation step to cyclohexane (that present in the hydrocarbon mixture (HM2)), while MCP is isomerized in the presence of a catalyst, preferably of an acidic ionic liquid, to cyclohexane. After the hydrogenation but prior to the isomerization the dimethylpentanes (DMP) are removed, with initial removal of the cyclohexane present in the hydrocarbon mixture (HM2) together with DMP. This cyclohexane already present prior to the isomerization can be separated again from DMP in a downstream rectification step and isolated and/or recycled into the process for cyclohexane preparation. Between the DMP removal and MCP isomerization&#x2014;if low boilers are present in the hydrocarbon mixture (HM1)&#x2014;low boilers are, optionally removed. After the isomerization, the cyclohexane is isolated, optionally with return of unisomerized MCP and optionally of low boilers. Preferably, cyclohexane and/or low boilers are present in the hydrocarbon mixture (HM1), and so a low boiler removal is preferably conducted between the DMP removal from isomerization. It is additionally preferable that the removal of the cyclohexane from DMP is additionally conducted, meaning that the cyclohexane component which arises in the benzene hydrogenation and may be present in the starting mixture (HM1) is isolated and hence recovered.

Process for preparing cyclohexane from benzene and methylcyclopentane with upstream benzene hydrogenation

The invention relates to a process for preparing acrylic acid from formaldehyde and acetic acid, comprising

Process for preparing acrylic acid from formaldehyde and acetic acid

A process for preparing acrylic acid from formaldehyde and acetic acid, is performed by (i) providing a gaseous stream S1 comprising formaldehyde, acetic acid, oxygen and water, where the formaldehyde content of stream S1 is in the range from 8% to 18% by volume, based on the total volume of stream S1, the ratio of the volumes of acetic acid to formaldehyde is in the range from 0.6:1 to 1.1:1, and the molar ratio of oxygen to the total amount of organic carbon is in the range from 0.02:1 to 0.15:1; and (ii) contacting stream S1 with an aldol condensation catalyst in a reaction zone to obtain a gaseous stream S2 containing acrylic acid.

Process for preparing acrylic acid

A process for preparing acrylic acid from methanol and acetic acid, comprising (i) contacting a gaseous stream Scomprising methanol, oxygen and inert gas with an oxidation catalyst to obtain a gaseous stream Scomprising formaldehyde and inert gas; (ii) removing at least a portion of the inert gas present in Sfrom at least a portion of the formaldehyde present in Sby absorbing this formaldehyde in an absorbent to obtain a gaseous stream Scomprising the portion of the inert gas removed, and to obtain a stream Scomprising absorbent and absorbate comprising formaldehyde; (iii) optionally removing a portion or the entirety of the absorbent present in stream S, such that a stream Sremains from stream S, and producing a stream Sfrom at least stream Sor stream Sand a stream Scomprising acetic acid; and (iv) contacting stream Sin gaseous form with an aldol condensation catalyst to obtain a gaseous stream Scomprising acrylic acid.

Process for preparing acrylic acid from methanol and acetic acid

A process for obtaining acrylic acid, comprising (a) providing a liquid stream S7 comprising acetic acid and acrylic acid, where the molar ratio of acetic acid to acrylic acid in stream S7 is greater than 1:1, (b-1) crystallizing a portion of the acetic acid present in stream S7 to obtain solid crystallized acetic acid in its mother liquor, (b-2) separating the mother liquor from the acetic acid crystallized in (b-1) to obtain the solid crystallized acetic acid and a liquid stream S8 comprising acrylic acid and acetic acid, (c) separating stream S8 into at least one stream S10 depleted of acrylic acid compared to S8 and a stream S11 enriched in acrylic acid compared to S8.

Process for obtaining acrylic acid

Growing community of inventors

Mannheim, Germany

Lukas Schulz