The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 19, 2018
Filed:
Nov. 18, 2016
Evonik Degussa Gmbh, Essen, DE;
Helene Reeker, Dortmund, DE;
Guido Stochniol, Haltern am See, DE;
Dietrich Maschmeyer, Recklinghausen, DE;
Horst-Werner Zanthoff, Mülheim a.d. Ruhr, DE;
Jörg Schallenberg, Dorsten, DE;
Frank Geilen, Haltern am See, DE;
Katrin Marie Dyballa, Recklinghausen, DE;
Dirk Fridag, Haltern am See, DE;
Stephan Peitz, Oer-Erkenschwick, DE;
Lena Altmann, Recklinghausen, DE;
Robert Franke, Marl, DE;
Evonik Degussa GmbH, Essen, DE;
Abstract
The invention relates to a process for preparing an ester mixture, in which an n-butene-containing feed mixture having a composition which changes over time is first oligomerized and then converted by hydroformylation, hydrogenation and esterification to an ester mixture. In this process, an approximation of the actual viscosity of the ester mixture is determined. The problem that it addresses is that of specifying a comparatively simple process which enables conversion of an n-butene with a variable composition over time to an ester mixture having a viscosity which can be kept very substantially constant over a long period even when an inconstant Csource which delivers fluctuating qualities over this period is utilized. This is achieved through controlled use of a second raw material, namely ethene. It has been found that the viscosity of n-butene-based ester mixtures can be influenced by controlled use of ethene in the preparation of the ester precursors. Specifically, the invention proposes two measures by which the ethene can be used: either directly as Colefin or as Colefin after prior separate oligomerization.