Separation system for hydrotreater effluent having reduced hydrocarbon loss
First Claim
1. A process for treating a sulfurous hydrocarbon stream comprising C5 and larger hydrocarbons and containing a sulfur concentration of at least 20 ppm to convert sulfur compounds to H2 S and reduce the sulfur concentration of said hydrocarbon stream, said process comprising:
- (a) admixing said sulfurous hydrocarbon feedstream with a hydrogen stream in a ratio of less than 50 SCFB;
(b) contacting said sulfurous hydrocarbon stream and said hydrogen in a hydrotreating zone with a hydrotreating catalyst at hydrotreating conditions to convert sulfur compounds to H2 S and produce a hydrotreated effluent stream;
(c) passing said hydrotreated effluent feedstream to a flash separator at conditions that will maintain a liquid phase containing at least 75 wt. % of said H2 S and removing hydrogen from said hydrotreated effluent to produce an at least partially stabilized effluent;
(d) passing said partially stabilized effluent at liquid phase conditions to an adsorption section and contacting said stabilized effluent with an adsorbent material selective for H2 S to adsorb H2 S from said effluent stream;
(e) recovering a desulfurized hydrocarbon stream from said adsorption section;
(f) passing a regeneration gas to said adsorption section and contacting said adsorbent material with said regeneration gas to desorb H2 S from said adsorbent material; and
(g) removing regeneration gas containing H2 S from said process.
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Accused Products
Abstract
A hydrotreating process uses a separation section that reduces the loss of C5 and higher hydrocarbons through the use of a low hydrogen to hydrocarbon ratio in the reactor and the adsorptive removal of a majority of hydrogen sulfide from a liquid phase hydrotreater effluent. Sulfurous hydrocarbon feed is admixed with hydrogen to maintain a hydrogen to hydrocarbon ratio of less than 50 SCFB. The hydrogen and hydrocarbons are passed through a hydrotreater reactor to convert sulfur compounds to H2 S. The hydrotreater effluent is cooled and after flashing of any excess hydrogen or light ends the cooled effluent is contacted with an adsorbent material for the removal of H2 S. A hydrotreated hydrocarbon product is withdrawn from the adsorption section. The low hydrogen to hydrocarbon ratio permits the process to be used without the recycle of hydrogen thereby eliminating the need for separators and compressors that were formerly used to recycle hydrogen to the hydrotreater. The elimination of the recycle and the low hydrogen to hydrocarbon ratio simplifies the flowscheme which can use a simple separator to flash light ends, hydrogen and some H2 S from the hydrotreater effluent. This process thus eliminates the need for a stripping section that was formerly needed to remove light ends and hydrogen sulfide from the hydrotreated product. The adsorptive removal of the H2 S and the limited venting of hydrogen allows essentially all of the hydrotreated product to be preserved. In most flowschemes H2 S removal can be carried out in the absorbers that are usually present for drying of the hydrotreated feed.
21 Citations
17 Claims
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1. A process for treating a sulfurous hydrocarbon stream comprising C5 and larger hydrocarbons and containing a sulfur concentration of at least 20 ppm to convert sulfur compounds to H2 S and reduce the sulfur concentration of said hydrocarbon stream, said process comprising:
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(a) admixing said sulfurous hydrocarbon feedstream with a hydrogen stream in a ratio of less than 50 SCFB; (b) contacting said sulfurous hydrocarbon stream and said hydrogen in a hydrotreating zone with a hydrotreating catalyst at hydrotreating conditions to convert sulfur compounds to H2 S and produce a hydrotreated effluent stream; (c) passing said hydrotreated effluent feedstream to a flash separator at conditions that will maintain a liquid phase containing at least 75 wt. % of said H2 S and removing hydrogen from said hydrotreated effluent to produce an at least partially stabilized effluent; (d) passing said partially stabilized effluent at liquid phase conditions to an adsorption section and contacting said stabilized effluent with an adsorbent material selective for H2 S to adsorb H2 S from said effluent stream; (e) recovering a desulfurized hydrocarbon stream from said adsorption section; (f) passing a regeneration gas to said adsorption section and contacting said adsorbent material with said regeneration gas to desorb H2 S from said adsorbent material; and (g) removing regeneration gas containing H2 S from said process. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A process for treating a sulfurous hydrocarbon stream comprising C5 and larger hydrocarbons and containing a sulfur concentration of at least 20 ppm to convert sulfur compounds to H2 S and reduce the sulfur concentration of said hydrocarbon stream, said process comprising:
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(a) admixing said sulfurous hydrocarbon feedstream with a hydrogen stream in an amount that will produce a hydrogen to hydrocarbon ratio of less than 50 SCFB; (b) contacting said sulfurous hydrocarbon stream and said hydrogen in a hydrotreating zone with a hydrotreating catalyst at hydrotreating conditions to convert sulfur compounds to H2 S and produce a hydrotreated effluent stream; (c) adjusting the amount of said hydrogen that is admixed with said sulfurous hydrocarbon stream to produce a hydrogen to hydrocarbon ratio of less than 4 mol. % in said hydrotreated effluent stream. (d) cooling said hydrotreated effluent stream and absorbing essentially all of said hydrogen into a liquid phase of said hydrotreated effluent stream; (e) passing said hydrotreated effluent from step (d) to an adsorption section and contacting said stabilized effluent with an adsorbent material selective for H2 S to adsorb H2 S from said effluent stream; (e) recovering a desulfurized hydrocarbon stream from said adsorption section; (f) passing a regeneration gas to said adsorption section and contacting said adsorbent material with said regeneration gas to desorb H2 S from said adsorbent material; and (g) removing regeneration gas containing H2 S from said process. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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Specification
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- Resources
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Current AssigneeUOP Llc (Honeywell International Inc.)
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Original AssigneeUOP Llc (Honeywell International Inc.)
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InventorsZarchy, Andrew S., Haizmann, Robert S., Symoniak, Martin F.
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Primary Examiner(s)Davis, Curtis R.
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Assistant Examiner(s)DIEMLER, WILLIAM
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Application NumberUS07/458,267Time in Patent Office362 DaysField of Search208/99, 208/100, 208/212, 208/213, 208/217, 208/188, 208/310 ZUS Class Current208/99CPC Class CodesC10G 67/06 including a sorption proces...
