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:
Nov. 05, 2019
Filed:
Aug. 20, 2015
Basf SE, Ludwigshafen, DE;
Gerald Vorberg, Speyer, DE;
Ralf Notz, Maxdorf, DE;
Thomas Ingram, Mannheim, DE;
Georg Sieder, Bad Duerkheim, DE;
Torsten Katz, Neustadt, DE;
BASF SE, Ludwigshafen, DE;
Abstract
An absorbent for selective removal of hydrogen sulfide from a fluid stream comprises an aqueous solution of a) a tertiary amine, b) a sterically hindered secondary amine of the general formula (I) in which Rand Rare each independently selected from C-alkyl and C-hydroxyalkyl; R, R, Rand Rare each independently selected from hydrogen, C-alkyl and C-hydroxyalkyl, with the proviso that at least one Rand/or Rradical on the carbon atom bonded directly to the nitrogen atom is C-alkyl or C-hydroxyalkyl when Ris hydrogen; x and y are integers from 2 to 4 and z is an integer from 1 to 4; where the molar ratio of b) to a) is in the range from 0.05 to 1.0, and c) an acid in an amount, calculated as neutralization equivalent relative to the protonatable nitrogen atoms in a) and b), of 0.05 to 15.0%. One preferred amine of the formula I is 2-(2-tert-butylaminoethoxy)ethanol. The absorbent allows a defined HS selectivity to be set at pressures of the kind typical in natural gas processing.