PROMOTING SCRUBBING OF ACID GASES

• US 3,856,921 A
• Filed: 11/10/1971
• Issued: 12/24/1974
• Est. Priority Date: 07/22/1970
• Status: Expired due to Term

• Current Assignee: Adam L. Shrier, Peter V. Danckwerts
• Original Assignee: Adam L. Shrier, Peter V. Danckwerts
• Inventors: Danckwerts, Peter V., Shrier, Adam L.
• Primary Examiner(s): Thomas, Earl C.
• Application Number:
  US05/197,370
• Time in Patent Office: 1,140 Days
• Field of Search: 423/226,228,229,240,242,243,235,245,232-234 208/207,289,331
• US Class Current: 423/228
• CPC Class Codes: B01D 53/1493 Selection of liquid materials for use as absorbents
• CPC Class Codes: B01D 53/526 Mixtures of hydrogen sulfide and carbon dioxide

Abstract

Acidic components are removed from fluids by contacting said fluid with a solution of a basic salt of an alkali or alkaline earth metal and an amine selected from the group consisting of 2methylaminoethanol, 2-ethylaminoethanol, morpholine, pyrrolidone and derivatives thereof. Preferably, the fluid is a gas and the acidic components are selected from the group consisting of CO2 and COS.

Claims

1. IN A PROCESS FOR THE REMOVAL OF ACIDIC COMPONENTS SAID ACIDIC COMPONENTS BEING SELECTED FROM THE GROUP CONSISTING OF H2S, CO2, SO3, CS2, HCN, HCL, COS, AND THE OXYGEN AND SULFUR DERIVATIVES OF C1 TO C4 HYDROCARBONS FROM GASES, WHICH COMPRISES CONTACTING SAID GAS WITH AN AQUEOUS SOLUTION COMPRISING A BASIC SALT, SELECTED FROM THE GROUP CONSISTING OF POTASSIUM CARBONATE, SODIUM CARBONATE, POTASSIUM HYDROXIDE AND SODIUM HYDROXIDE, THE IMPROVEMENT COMPRISING CONTACTING SAID GAS AND SAID SOLUTION IN THE PRESENCE OF AN AMINE SELECTED FROM THE GROUP CONSISTING OF 2-METHYLAMIDETHANOL, 2-ETHYLAMINOETHANOL, MORPHOLINE, AND PYRROLIDINE.

2. The process of claim 1 wherein said acid gases are selected from the group consisting of CO2 and COS.

3. The process of claim 1 wherein said basic salt comprises from about 5 to 40% by weight of said solution.

4. The process of claim 1 wherein said amine comprises from about 0.5 to 20% by weight of said solution.

5. The process of claim 1 wherein said contacting takes place at a temperature of from about 20* to 200*C and a 2,000 of from about 5 to 2000 psi.

6. The process of claim 1 wherein said salt is K2CO3.

7. The process of claim 6 wherein said solution is from about 10 to 35% by weight K2CO3 and from about 1 to 5 wt. % amine.

8. The process of claim 7 wherein said solution further comprises from about 0.5 to 10 wt. % of a hydration catalyst selected from the group consisting of As(OH)3, Ge(OH)4, HOCl, H3BO3, H2SO3 and HCHO.

9. The process of claim 7 wherein said solution further comprises boric acid in a ratio of 0.5 to 5.0 moles boric acid/mole amine.