Exxon Research and Engineering Company

Exxon Chemical Patents, Inc.

George E Milliman

Guido Sartori

Warren A Thaler

W S Ho

Larry J Shulik

Michael T Melchior

Chang J Kim

George R Chludzinski

Ramdas Venkatram

A gas treating composition prepared by reacting 2-amino-2-methyl-1-propanol with KOH, diluting with water and adding K.sub.2 CO.sub.3 and a vanadium corrosion inhibitor.

Primary hindered aminoacids for promoted acid gas scrubbing process

The present invention is directed to a process for removing impurities from hydrocarbon streams, preferably light ends, such as propylene and ethylene, which is preferably in the liquid phase, by contacting the hydrocarbon stream containing an initial amount of an impurity with a chemical adsorbent which is composed of a modified alumina having a surface area within the range of about 10 m.sup.2 /g to about 300 m.sup.2 /g and a pore volume within the range of about 0.1 mL/g to about 1 mL/g under contacting conditions effective to result in a purified hydrocarbon stream containing a reduced amount of impurities, i.e., less than about 0.5% relative to the initial amount of the acid impurity present in the hydrocarbon stream, and more preferably within the 10 ppb range.

Process for upgrading the quality of light ends

Disclosed are primary sterically hindered aminoacids for use as promoters for alkali metal salts in acid gas scrubbing. The primary sterically hindered aminoacid is selected from 1-amino-cyclopentane carboxylic acid and those represented by the formula: ##STR1## where R.sub.1 and R.sub.2 are independently selected from CH.sub.3, C.sub.2 H.sub.5, and C.sub.3 H.sub.7 ; R.sub.3 and R.sub.4 are independently selected from hydrogen and CH.sub.3 ; and n is 0, 2, or 3.

Disclosed are primary sterically hindered aminoacids for use as promoters for alkali metal salts in acid gas scrubbing. The primary sterically hindered aminoacid is selected from 1-amino-cyclopentane carboxylic acid and those represented by the formula: ##STR1## where R.sub.1 and R.sub.2 are independently selected from CH.sub.3, C.sub.2 H.sub.5, and C.sub.3 H.sub.7 ; R.sub.3 and R.sub.4 are independently selected from hydrogen and CH.sub.3 : and n is 0, 2, or 3.

Antifoaming agents for use in acid gas scrubbing processes comprising 1-secondary or 1-tertiary alkyl- or 1-cycloalkyl-hexahydro-2-pyrimidinones and 1-secondary or 1-tertiary alkyl- or 1-cycloalkyl-2-imidazolidinones are disclosed.

1-Secondary or 1-tertiary alkyl or cycloalkyl-hexahydro-2-pyrimidinones

Acidic gases such as carbon dioxide are removed from a gaseous mixture including the acidic component by contacting the gaseous mixture in a scrubbing system with an acid absorbing solution comprising a basic alkali metal compound and an activator, during which process at least a portion of the activator is converted to cyclic urea. At least a portion of the scrubbing solution is transferred to a thermal conversion zone wherein at least a portion of the cyclic urea is converted back to the activator afterwhich the scrubbing solution is returned to the scrubbing system from the thermal conversion zone.

Process for converting cyclic urea to corresponding diamine in a gas

Antifoaming agents for use in acid gas scrubbing processes comprising 1-secondary or 1-tertiaryalkyl- or 1-cycloalkyl-hexahydro-2-pyrimidinones and 1-secondary or 1-tertiary alkyl- or 1-cycloaklyl-2-imidazolidinones are disclosed.

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Fanwood, NJ, United States of America

George E Milliman