Process for removing sulphur compounds including hydrogen sulphide and mercaptans from gas streams
First Claim
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1. A process for the removal of hydrogen sulphide and mercaptans from a gas stream having a high ratio of mercaptans to hydrogen sulphide and comprising hydrogen sulphide and mercaptans, wherein the process comprises:
- washing the gas stream with an aqueous washing solution comprising 10 to 45 wt % (based on total solution) of water, 10 to 40 wt % (based on total solution) of a physical solvent, and 20 to 60 wt % (based on total solution) of an amine, to yield a washed gas stream;
followed by removing mercaptans from the washed gas stream by means of molecular sieves, in which process the amount of mercaptans removed by the aqueous washing solution from the gas stream is between 60 and 96% (of total removed mercaptans in steps one and two), and the amount of mercaptans removed by the molecular sieves is between 4 and 40% (of total removed mercaptans in step one and two).
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Abstract
A process for the removal of hydrogen sulfide and mercaptans from a gas stream containing a high ratio of mercaptans to hydrogen sulfide, wherein the first step removes hydrogen sulfide by washing the gas stream with an aqueous washing solution comprising water, a physical solvent and a chemical solvent. The first removal step is followed by a second removal step by which mercaptans are removed from the washed gas stream by means of molecular sieves.
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20 Claims
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1. A process for the removal of hydrogen sulphide and mercaptans from a gas stream having a high ratio of mercaptans to hydrogen sulphide and comprising hydrogen sulphide and mercaptans, wherein the process comprises:
- washing the gas stream with an aqueous washing solution comprising 10 to 45 wt % (based on total solution) of water, 10 to 40 wt % (based on total solution) of a physical solvent, and 20 to 60 wt % (based on total solution) of an amine, to yield a washed gas stream;
followed by removing mercaptans from the washed gas stream by means of molecular sieves, in which process the amount of mercaptans removed by the aqueous washing solution from the gas stream is between 60 and 96% (of total removed mercaptans in steps one and two), and the amount of mercaptans removed by the molecular sieves is between 4 and 40% (of total removed mercaptans in step one and two). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
- washing the gas stream with an aqueous washing solution comprising 10 to 45 wt % (based on total solution) of water, 10 to 40 wt % (based on total solution) of a physical solvent, and 20 to 60 wt % (based on total solution) of an amine, to yield a washed gas stream;
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14. A process for the removal of hydrogen sulfide and mercaptans from a gas stream that comprises hydrogen sulfide and a mercaptan and having a high ratio of mercaptans to hydrogen sulfide, wherein said process comprises:
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washing said gas stream with an aqueous washing solution, comprising from 10 wt % to 45 wt % water, from 10 wt % to 40 wt % physical solvent, and from 20 wt % to 60 wt % amine, wherein said wt % is based on the total weight of said aqueous washing solution, to remove from said gas stream between 60% to 96% of the total mercaptans removed from said gas stream by said process to thereby yield a washed gas stream; and using a molecular sieve to remove from said washed gas stream a portion of the mercaptans contained in said washed gas stream amounting to between 4% to 40% of the total mercaptans removed from said gas stream by said process to thereby yield a treated gas stream having an amount of mercaptans that is less than that of said gas stream and in the range of from 5 ppmv to 60 ppmv. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification