Using solvents for acidic gas removal
AssigneeColumbia Gas System Service Corporation
InventorCharles C. Hong
Life of this patent
Estimating the term…
Abstract
Disclosed is an improved process for removing carbon dioxide containing acidic gas from a normally gaseous mixture wherein the gaseous mixture is contacted with a liquid anhydrous solvent which physically absorbs said acidic gas but which is chemically unreactive with said acidic gas, said solvent being the reaction product of an alkylating agent and a solvent which is chemically reactive with said acidic gas for its removal from said mixture. The preferred solvent is selected from the group consisting of N,N-dialkylaminoalkanol, N,N-dialkoxyalkylaminoalkanol, N-alkyl-N-alkoxyalkylaminoalkanol, N,N-dialkylaminoalkylether, N,N-dialkoxyalkylaminoalkylether, N-alkyl-N-alkoxyalkylaminoalkylether, dialkyl carbonate, di(alkoxyalkyl) carbonate, mono-alkyl-monoalkoxyalkyl carbonate, and mixtures thereof.
Claims10
In a cyclic process for removing carbon dioxide containing acidic gas from a normally gaseous mixture containing same, wherein said gaseous mixture is contacted with a solvent under acidic gas/solvent contact conditions, said acidic gas bearing solvent is stripped of said acidic gas, and said stripped solvent is recycled for contact with additional gaseous mixture, the improvement which comprises:
- contacting said gaseous mixture containing on a dry molar basis between about 5% and 95% carbon dioxide with a solvent which is liquid under said contact conditions, said solvent restricted to an anhydrous solvent which physically absorbs said acidic gas but which is chemically unreactive with said acidic gas under said contact conditions, said solvent selected from the group consisting of N,N-dialkylaminoalkanol, N,N-dialkoxyalkylaminoalkanol, N-alkyl-N-alkoxyalkylaminoalkanol, N,N-dialkylaminoalkylether, N,N-dialkoxyalkylaminoalkylether, N-alkyl-N-alkoxyalkylaminoalkylether, dialkyl carbonate, di(alkoxyalkyl) carbonate, mono-alkyl-monoalkoxyalkyl carbonate, and mixtures thereof, said solvent optionally in admixture with an anhydrous cosolvent which also is chemically unreactive with said acidic gas.
In a process for removing carbon dioxide containing acidic gas from a normally gaseous mixture containing same, wherein said gaseous mixture is contacted with a solvent at a temperature of between about -50.degree. and 200.degree. F. and a pressure of between about 1 and 2000 psig, the improvement which comprises:
- contacting said gaseous mixture containing on a dry molar basis between about 15% and 95% carbon dioxide with a solvent which is liquid at said temperature and said pressure, said solvent restricted to an anhydrous solvent which physically absorbs said acidic gas but which is chemically unreactive with said acidic gas at said temperature and said pressure, said solvents selected from the group consisting of N,N-dialkylaminoalkanol, N,N-dialkoxyalkylaminoalkanol, N-alkyl-N-alkoxyalkylaminoalkanol, N,N-dialkylaminoalkylether, N,N-dialkoxyalkylaminoalkylether, N-alkyl-N-alkoxyalkylaminoalkylether, dialkyl carbonate, di(alkoxyalkyl) carbonate, mono-alkyl-monoalkoxyalkyl carbonate, and mixtures thereof, said solvent optionally in admixture with an anhydrous cosolvent which also is chemically unreactive with said acidic gas.
Dependencies are inferred from the claim text.