Catalyst for the synthesis of alkyl mercaptan and process for its preparation

Patent metadata

Field	Value
Publication number	US-12331009-B2
Application number	US-202017425907-A
Country	US
Kind code	B2
Filing date	Jan 27, 2020
Priority date	Jan 29, 2019
Publication date	Jun 17, 2025
Grant date	Jun 17, 2025

Abstract

A catalyst may include a support and from 5 to 20 wt.-% of a promoter, based on the total weight of the catalyst, wherein the support may include titanium dioxide, zirconium dioxide, and/or a mixture thereof, and the promoter may be an alkali metal oxide. Processes for preparing such catalysts may include impregnating a support of titanium dioxide and/or zirconium dioxide with an aqueous solution including a preferably soluble alkali compound and calcining. Alkyl mercaptans may be prepared in the presence of such catalysts or catalysts obtained by such processes.

First claim

The invention claimed is:

1. A process for preparing an alkyl mercaptan, the process comprising:
reacting an alkyl alcohol with hydrogen sulfide in the presence of a catalyst comprising:
a support; and
5 to 20 wt. % of cesium oxide, based on total catalyst weight, wherein the support consists of titanium dioxide and/or zirconium dioxide, and at least a part of the support has a tetragonal phase.

2. The process of claim 1 , wherein the catalyst is a full catalyst.

3. The process of claim 1 , wherein the catalyst is a core-shell catalyst.

4. The process of claim 1 , wherein the catalyst is obtained by a process comprising:
(a) impregnating a support consisting of titanium dioxide and/or zirconium dioxide with an aqueous solution comprising a soluble cesium compound, to obtain an impregnated support;
(b) drying the impregnated support, to obtain a dried impregnated support; and
(c) calcining the dried impregnated support to provide the catalyst.

5. The process of claim 4 , wherein the impregnating (a), the drying (b), and the calcining (c) are repeated at least once.

6. The process of claim 4 , wherein the process to obtain the catalyst further comprises:
(d1) shaping the catalyst obtained from the calcining (c) to give a full catalyst.

7. The process of claim 4 , wherein the process to obtain the catalyst further comprises:
d2) applying the catalyst obtained from the calcining (c) to a core to provide a core-shell catalyst.

8. The process of claim 1 , wherein the alkyl alcohol to be reacted is methanol and the alkyl mercaptan to be prepared is methyl mercaptan.

Assignees

• Evonik Operations Gmbh

Inventors

• Lautenschuetz Ludger
• Duerr Nadine
• Fischer Achim
• Weber-Stockbauer Manuel
• Gutierrez-Tinoco Oliver Yair
• Bermejo Deval Ricardo
• Lercher Johannes A

Classifications

• B01J2235/10

  Infrared [IR] · CPC title

• B01J2235/15

  X-ray diffraction · CPC title

• B01J35/70

  characterised by their crystalline properties, e.g. semi-crystalline (catalysts comprising carbon B01J21/18; molecular sieves B01J29/00) · CPC title

• B01J2235/00

  Indexing scheme associated with group B01J35/00, related to the analysis techniques used to determine the catalysts form or properties · CPC title

• B01J35/397

  Egg shell like · CPC title