Claus feed gas hydrocarbon removal
AssigneeEngelhard Corporation
InventorsKenneth F. Butwell, William B. Dolan, Steven M. Kuznicki
Life of this patent
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Abstract
A process for adsorbing hydrocarbons from an acid gas stream includes passing the acid gas stream through an adsorbent which selectively removes hydrocarbons, desorbing the hydrocarbons from the adsorbent and contacting the desorbed hydrocarbons with an acid gas removal solution to remove acid gases which have been coadsorbed with the hydrocarbons. The process is particularly useful in removing hydrocarbons from a hydrogen sulfide-containing stream which is being directed to Claus processing for conversion into elemental sulfur. Useful adsorbents include crystalline titanium silicate molecular sieves containing titania octahedral sites such as ETS-10 and similar materials, as well as high silica aluminosilicate zeolite.
Claims44
A process for the removal of hydrocarbons from a mixture of the same with acid gases which comprises;
- contacting said mixture with a titanium silicate molecular sieve containing octahedrally coordinated titania chains connected by tetrahedral silica, whereby the hydrocarbons are preferentially removed from the mixture.
In a process for feeding a hydrogen sulfide-containing feed stream to a Claus process and converting the hydrogen sulfide to elemental sulfur and wherein the feed stream to the Claus process comprises hydrogen sulfide and minor amounts of hydrocarbons and other organic contaminants, the improvement which comprises:
- passing the feed stream in contact with a titanium silicate molecular sieve containing octahedrally coordinated titania chains linked by tetrahedral silica to thereby selectively adsorb the hydrocarbons and other organics from the feed stream and to form a product stream of reduced hydrocarbon and organic content, passing the product stream to the Claus process.
A process for the removal of hydrocarbons from a mixture of the same with acid gases which comprises:
- contacting said mixture with an adsorbent which selectively removes hydrocarbons from said mixture, recovering a gas stream passing through said adsorbent which has a reduced hydrocarbon content, subsequently treating said adsorbent to provide desorption of a hydrocarbon stream from said adsorbent, said hydrocarbon stream containing minor amounts of acid gases which have been coadsorbed from said mixture, and contacting said hydrocarbon stream with a lean acid gas removal solution to remove at least a portion of the minor amounts of acid gases which are contained within said hydrocarbon stream.
In a process for feeding a hydrogen sulfide-containing feed stream to a Claus process and converting the hydrogen sulfide to elemental sulfur and wherein said feed stream to the Claus process comprises hydrogen sulfide and minor amounts of hydrocarbons and other organic contaminants, the improvement which comprises:
- passing said feed stream in contact with an aluminosilicate zeolite having a silica to alumina mole ratio of at least 4 to thereby selectively adsorb the hydrocarbons and other organics from the feed stream to form a product stream having reduced hydrocarbon and other organic content, passing the product stream to the Claus process, regenerating said zeolite subsequent to contact with said feed stream by passing a purge stream into contact with said zeolite thereby desorbing adsorbed hydrocarbons and other organics from said zeolite into said purge stream, contacting said purge stream after contact with said zeolite with a lean acid gas removal solution to remove any hydrogen sulfide which has been adsorbed by said zeolite from said feed stream, and which is desorbed into said purge stream.
Dependencies are inferred from the claim text.