Mark Alan Hewlett

US Patent:

7087795, Aug 8, 2006

Filed:

Nov 27, 2002

Appl. No.:

10/497356

Inventors:

Thomas Krumrey - Ratingen, DE
Kurt Schalapski - Oberhausen, DE
Robert Rapier - Ponca City OK, US
John Steinbach - Bay City TX, US
Bak Shah - Bay City TX, US
Mark Hewlett - Bay City TX, US

Assignee:

Celanese Chemicals Europe GmbH

International Classification:

C07C 45/50

US Classification:

568429, 568454

Abstract:

The invention relates to a hydroformylation method, whereby the homogeneous liquid reactor discharge is first supplied to a gas/liquid separator and then run through an extraction column with a counter-current of synthesis gas and finally fed to an evaporator. The invention is characterised in that the homogeneous liquid mass flow is supplied to the upper section of the extraction column at a temperature above 90 C.

US Patent:

20030119923, Jun 26, 2003

Filed:

Sep 5, 2002

Appl. No.:

10/181393

Inventors:

Hans-Willi Bohnen - Moers, DE
Richard Fischer - Louisville, DE
Mark Hewlett - Bay City TX, US
Wolfgang Zgorzelski - Oberhausen, DE
Norbert Schopper - Duisburg, DE

International Classification:

C07C027/06
B01J020/34
B01J038/48

US Classification:

518/716000, 502/022000

Abstract:

The invention relates to a method for separating and recovering rhodium from reaction products of oxosynthesis, especially reaction products containing cobalt. The invention also relates to the reuse of rhodium as a catalyst for hydroformulation and to a catalyst for hydroformulation itself. The inventive method is characterized by the following: extraction of the organic solution with an aqueous phosphate solution or a phosphate solution, water washing, oxidative treatment of the organic phase, and extraction of the organic phase with an aqueous water-soluble arylphosphine solution.