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Desulfurization and novel sorbent for same

a technology of sorbent and sulfur, applied in the field of sorbent composition, can solve the problems of large hydrogen consumption cost, high sulfur content of such automotive fuels, and reduced octane number, and achieve the effect of minimizing hydrogen consumption and reducing the saturation of olefins and aromatics

Inactive Publication Date: 2006-04-20
CHINA PETROCHEMICAL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a new sorbent system for removing sulfur from hydrocarbon-containing fluid streams, such as cracked-gasoline and diesel fuels. The sorbent composition includes a support, a promoter, and a silicate. The process of making the sorbent involves forming a support mix, particulating the mix to provide a support particulate, contacting the particulate with a promoter to provide a reduced sorbent composition, and incorporating a silicate. The process for removing sulfur from a hydrocarbon-containing fluid stream involves contacting the fluid stream with the sorbent composition, separating the desulfurized fluid stream from the sulfurized sorbent, regenerating at least a portion of the sulfurized sorbent, reducing the reduced sorbent, and returning at least a portion of the reduced sorbent to the desulfurization zone. The invention provides a novel sorbent system with enhanced attrition resistance and a method for removing sulfur from hydrocarbon-containing fluid streams with minimal saturation of olefins and aromatics, as well as hydrogen consumption.

Problems solved by technology

High levels of sulfur in such automotive fuels is undesirable because oxides of sulfur present in automotive exhaust may irreversibly poison noble metal catalysts employed in automobile catalytic converters.
However, most conventional sulfur removal processes, such as hydrodesulfurization, tend to saturate olefins and aromatics in the cracked-gasoline and thereby reduce its octane number (both research and motor octane number).
In removing sulfur from diesel fuel by hydrodesulfurization, the cetane is improved but there is a large cost in hydrogen consumption.
However, conventional sorbents generally do not have sufficient attrition resistance (i.e., resistance to physical deterioration) for all applications.

Method used

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  • Desulfurization and novel sorbent for same
  • Desulfurization and novel sorbent for same

Examples

Experimental program
Comparison scheme
Effect test

example i

[0080] Sorbent A (control) was prepared by mixing 20 grams of sodium pyrophosphate (available from Aldrich Chemical Company, Milwaukee, Wis.) and 2224 grams of distilled water in a Cowles dissolver to create a sodium pyrophosphate solution. A 200 gram quantity of aluminum hydroxide powder (Dispal® Alumina Powder, available from CONDEA Vista Company, Houston, Tex.), a 628 gram quantity of diatomaceous earth (Celite® Filter Cell, available from Manville Sales Corporation, Lampoc, Calif.), and a 788 gram quantity of zinc oxide powder (available from Zinc Corporation, Monaca, Pa.) were then mixed to form a powdered mixture. The powdered mixture was slowly added to the sodium pyrophosphate solution and mixed for 15 minutes to create a sorbent base slurry. The resulting mixed slurry was sieved through a 25-mesh screen.

[0081] The sorbent base slurry was then formed into sorbent base particulate using a counter-current spray drier (Niro Mobile Minor Spray Dryer, available from Niro Inc., C...

example ii

[0095] The attrition resistance of Sorbents A-E was then determined using the Davison Test. The Davison Index, which represents the weight percent of the over 20 micrometer particle size fraction which is reduced to particle sizes of less than 20 micrometers under test conditions, was measured using a Jet cup attrition determination method. The Jet cup attrition determination involved screening a 5 gram sample of sorbent to remove particles in the 0 to 20 micrometer size range. The sorbent particles above 20 micrometers were then subjected to a tangential jet of air at a rate of 21 liters per minute introduced through a 0.0625 orifice fixed at the bottom of a specially designed Jet cup (1″ I.D.×2″ height) for a period of 1 hour. The Davison Index (DI) was calculated as follows: DI=Wt. ⁢of⁢ ⁢0⁢–20⁢ ⁢Micrometer⁢ ⁢Formed⁢ ⁢During⁢ ⁢TestWt. ⁢of⁢ ⁢Original+20⁢ ⁢Micrometer⁢ ⁢Fraction⁢ ⁢Being⁢ ⁢Tested×100×Correction⁢ ⁢Factor

The correction factor of 0.3 was determined using a known calibr...

example iii

[0098] Sorbents C-E were then reactor tested under desulfurization conditions.

[0099] A 10 gram quantity of −100 / +325 mesh Sorbent C was placed in a reactor (1 inch I.D. fluidized bed reactor with clam shell heater) and heated to 700° F. Catalytically Cracked Gasoline (CCG) (345 ppmw sulfur), nitrogen, and hydrogen were then simultaneously charged to the reactor at 13.4 ml / hr, 150 cc / min, and 150 cc / min, respectively. The reactor bed temperature was maintained between about 730° F. and 740° F. Effluent samples were taken at 4 hourly increments and designated Samples 1A-4A.

[0100] CCG flow to the reactor was then terminated and the sulfurized sorbent was regenerated with air (60 cc / min) and nitrogen (240 cc / min) at a temperature of about 900° F. for about 100 minutes. The reactor temperature was then reduced to about 700° F. and the regenerated sorbent was reduced with hydrogen (300 cc / min) for about 95 minutes. CCG (345 ppmw sulfur), nitrogen, and hydrogen were then simultaneously c...

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Abstract

A sorbent composition comprising a support, a promoter, and a silicate can be used to desulfurize a hydrocarbon-containing fluid such as cracked-gasoline or diesel fuel.

Description

[0001] This application is a continuation of application Ser. No. 10 / 021,982, filed Nov. 28, 2001, now pending.BACKGROUND OF THE INVENTION [0002] This invention relates to a sorbent composition, a process of making a sorbent composition, and a process of using a sorbent composition for the removal of sulfur from a hydrocarbon-containing fluid. [0003] Hydrocarbon-containing fluids such as gasoline and diesel fuels typically contain a quantity of sulfur. High levels of sulfur in such automotive fuels is undesirable because oxides of sulfur present in automotive exhaust may irreversibly poison noble metal catalysts employed in automobile catalytic converters. Emissions from such poisoned catalytic converters may contain high levels of non-combusted hydrocarbons, oxides of nitrogen, and / or carbon monoxide, which, when catalyzed by sunlight, form ground level ozone, more commonly referred to as smog. [0004] Much of the sulfur present in the final blend of most gasolines originates from a...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C10G25/00C10G25/12B01J20/02B01J20/06B01J20/10B01J20/32B01J20/34
CPCB01J20/02B01J20/0244B01J20/06B01J20/10B01J20/3204B01J20/3236C10G25/003B01J20/08B01J20/3078B01J20/3433B01J20/3458B01J20/3483B01J20/3491B01J2220/42B01J20/0225B01J20/28004B01J20/28019B01J20/28016B01J20/04B01J20/103
Inventor KHARE, GYANESH P.
Owner CHINA PETROCHEMICAL CORP
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