Desulfurization system and method for desulfurizing a fuel stream

a technology of desulfurization system and fuel stream, which is applied in the direction of filtration separation, multi-stage water/sewage treatment, separation process, etc., can solve the problems of shortening the life expectancy of the components of the fuel cell processing train, and affecting the efficiency of the desulfurization system

Inactive Publication Date: 2006-12-21
SUD CHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0015] A further invention is a sequential sulfur adsorbent system, particularly for hydrogen generation and most particularly for use in a fuel cell processing train, comprising, in sequence, a calcium exchanged zeolite, a hydrated alumina adsorbent, and a selective sulfur adsorbent. The choice of the specific selective sulfur adsorbent that is used within the sequential sulfur adsorbent system depends upon the composition and quantity of the sulfur compounds that are present in the hydr...

Problems solved by technology

Unfortunately, virtually all raw fuels of this type contain relatively high levels, up to as high as 1,000 ppm or so, but typically in the range of 20 to 500 ppm, of various naturally occurring sulfur compounds, such as, but not limited to, carbonyl sulfide, hydrogen sulfide, thiophenes, such as tetra hydro thiophene, dimethyl sulfide, various mercaptans, disulfides, sulfoxides, other organic sulfides, higher molecular weight organic sulfur compounds, and combinations thereof.
The presence of sulfur-containing compounds, particularly carbonyl sulfide, in a hydrocarbon fuel stream can be very damaging to components of the fuel cell processing train, including the fuel cell stack itself, and such compounds must therefore be substantially removed.
If not substantially removed, the sulfur compounds may shorten the life expectancy of the componen...

Method used

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  • Desulfurization system and method for desulfurizing a fuel stream
  • Desulfurization system and method for desulfurizing a fuel stream

Examples

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example 1

[0073] The synthetic natural gas containing carbonyl sulfide is passed through a reactor containing, in sequence, calcium-exchanged zeolite X and the selective sulfur adsorbent. The zeolite X has an Si:Al equivalent ratio of 1.17 and a calcium exchange of 70% with the remaining metal ions comprising sodium and / or potassium. The selective sulfur adsorbent comprises 70% by weight manganese compounds, 21% copper oxide comprising Cuo and 9% silica. The temperature of the reactor is maintained at 38° C. and the pressure is maintained at about 2 bar. The sulfur adsorbency of the two component system is shown on FIG. 1, and shows breakthrough occurring at 136 hours. The percent S in the form of COS that is removed by this system is listed in FIG. 2.

example 2

[0074] A further test is run wherein the calcium exchanged zeolite and selective sulfur adsorbent of Example 1 are used in combination with a hydrated alumina in the reactor. The hydrated alumina is commercial pseudoboehmite. The hydrated alumina is placed in sequence in the system after the calcium-exchanged zeolite X and before the selective sulfur adsorbent. Fifty percent of the components by volume is composed of the zeolite X and 25% is composed of each of the selective sulfur adsorbent and the hydrated alumina. A total of 10 ccs of the components is used. The operating conditions and the composition of the feed stream are the same as for Example 1. The percent S in the form of COS that was removed by the system is listed in FIG. 2. When the feed stream is passed through the reactor, breakthrough does not occur until 204 hours, as shown in FIG. 1. In addition, as shown in FIG. 2, a higher percentage of sulfur is removed from the feed stream by breakthrough utilizing the three c...

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Abstract

A method for producing a substantially desulfurized hydrocarbon fuel stream at temperatures less than 100° C. including providing a nondesulfurized fuel cell hydrocarbon fuel stream and passing the fuel stream through a sequential sulfur adsorbent system containing calcium exchanged zeolite, hydrated alumina and a selective sulfur adsorbent placed in sequence to produce a substantially desulfurized hydrocarbon fuel stream.

Description

CROSS REFERENCED TO RELATED APPLICATIONS [0001] This application is a continuation-in-part application based on application Ser. No. 11 / 207,154, filed on Aug. 18, 2005, which is a continuation-in-part application based on application Ser. No. 10 / 923,177, which was filed on Sep. 1, 2004.BACKGROUND OF INVENTION [0002] The present invention relates to a novel method for producing a substantially desulfurized hydrocarbon fuel stream, particularly for hydrogen generation, and more particularly for use within a fuel cell processing train, by passing a nondesulfurized hydrocarbon fuel stream, particularly natural gas, propane or liquefied petroleum gas (LPG), through a sequential sulfur adsorbent system at temperatures less than 100° C., wherein the sequential sulfur adsorbent system contains in sequence a zeolite sulfur adsorbent, a hydrated alumina adsorbent, and a selective sulfur adsorbent. The present invention further relates to a process for producing hydrogen within a fuel cell pro...

Claims

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Application Information

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IPC IPC(8): C10G45/04
CPCB01D53/02B01D2259/4145B01D2257/304B01D2257/306B01D2257/308B01J20/0222B01J20/0229B01J20/0237B01J20/0244B01J20/06B01J20/08B01J20/186B01J20/20B01J20/2803B01J20/28052B01J20/28057B01J2220/42C10G25/003C10G25/05C10G53/08B01D53/04B01D2253/108B01D2253/1124B01D2256/245B01D2257/30
Inventor SPIVEY, R. STEVEWESTON, ERIC JAMIEMCKINNEY, MIKE
Owner SUD CHEM INC
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