# US 5,705,090 A · Absorption of mercaptans

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- Number: US 5,705,090 A
- Document ID: US5705090A
- Status: Granted
- Kind: A
- Application number: 08/708,978
- Filed: 1996-09-06
- Granted: 1998-01-06
- Earliest claimed: 1993-11-09
- Assignees: Union Carbide Chemicals & Plastics Technology Corporation
- Inventors: Paul Garland; Craig Norman Schubert; Richard Alan Gregory; Eduardo Garcia-Rameau; Rickey Epps; David Burns; Robert Jerry Hlozek
- Web page: https://patentgrep.com/patent/US5705090A

## CPC

- B01D 53/1487: {Removing organic compounds}
- B01D 53/1493: {Selection of liquid materials for use as absorbents}
- B01D 2257/306: Organic sulfur compounds, e.g. mercaptans
- B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28)

## Abstract

Absorption solvents for removing mercaptans from gas streams are disclosed. The absorption solvents comprise an alkylether of a polyalkylene glycol, e.g., methoxytriglycol, and a secondary monoalkanolamine, e.g., N-methylethanolamine, as well as optionally other amines, e.g., methyldiethanolamine and diethanolamine. The absorption solvents do not require the presence of iodine for removal of mercaptans. Absorption processes utilizing the solvents are also disclosed.

## Claims

### Claim 1

An absorption solvent for use in an acid gas scrubbing process, consisting essentially of:
(i) from about 30 to 60 weight percent of the absorption solvent on an anhydrous basis of methoxytriglycol;
(ii) from about 1 to 15 weight percent of the absorption solvent on an anhydrous basis of N-methylethanolamine;
(iii) from about 10 to 40 weight percent of the absorption solvent on an anhydrous basis of diethanolamine;
(iv) from about 5 to 20 weight percent of the absorption solvent on an anhydrous basis of methyldiethanolamine; and
(v) from about 0.1 to 80 weight percent water based on the total weight of the absorption solvent.