US 9,809,535 B2
Process for the preparation of alkyl mercaptans
Benjamin Fonfe, Frankfurt (DE); Stephan Kretz, Biebergemuend (DE); and Harald Jakob, Hasselroth (DE)
Assigned to Evonik Degussa GmbH, Essen (DE)
Filed by Benjamin Fonfe, Frankfurt (DE); Stephan Kretz, Biebergemuend (DE); and Harald Jakob, Hasselroth (DE)
Filed on Dec. 18, 2015, as Appl. No. 14/974,625.
Claims priority of application No. 14199311 (EP), filed on Dec. 19, 2014.
Prior Publication US 2016/0176808 A1, Jun. 23, 2016
Int. Cl. C07C 319/08 (2006.01)
CPC C07C 319/08 (2013.01) 20 Claims
 
1. A process for preparing an alkyl mercaptan, the process comprising:
reacting an aliphatic alcohol with hydrogen sulfide in the presence of a heterogeneous catalyst, and
a) starting the preparation of the alkyl mercaptan at a temperature T1 and preparing the alkyl mercaptan at the temperature T1 for a time period t1, and
b) performing temperature cycles of the number n, comprising
b1) increasing the reaction temperature to a temperature T2 and preparing the alkyl mercaptan at the temperature T2 for a time period t2, followed by
b2) decreasing the reaction temperature from the temperature T2 to a temperature T3 and preparing the alkyl mercaptan at the temperature T3 for a time period t3,
wherein
the temperature T2 is always higher than the temperatures T1 and T3,
and
n is an integer larger than zero.