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Title: Method for reducing sulfate formation during regeneration of hot-gas desulfurization sorbents

Abstract

The regeneration of sulfur sorbents having sulfate forming tendencies and used for desulfurizing hot product gas streams such as provided by coal gasification is provided by employing a two-stage regeneration method. Air containing a sub-stoichiometric quantity of oxygen is used in the first stage for substantially fully regenerating the sorbent without sulfate formation and then regeneration of the resulting partially regenerated sorbent is completed in the second stage with air containing a quantity of oxygen slightly greater than the stoichiometric amount adequate to essentially fully regenerate the sorbent. Sulfate formation occurs in only the second stage with the extent of sulfate formation being limited only to the portion of the sulfur species contained by the sorbent after substantially all of the sulfur species have been removed therefrom in the first stage.

Inventors:
 [1];  [1];  [2]
  1. Morgantown, WV
  2. Westover, WV
Issue Date:
Research Org.:
National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV (United States)
OSTI Identifier:
869507
Patent Number(s):
5348921
Assignee:
United States of America as represented by United States (Washington, DC)
Patent Classifications (CPCs):
B - PERFORMING OPERATIONS B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL B01J - CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY
C - CHEMISTRY C01 - INORGANIC CHEMISTRY C01B - NON-METALLIC ELEMENTS
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
method; reducing; sulfate; formation; regeneration; hot-gas; desulfurization; sorbents; sulfur; forming; tendencies; desulfurizing; hot; product; gas; streams; provided; coal; gasification; employing; two-stage; air; containing; sub-stoichiometric; quantity; oxygen; stage; substantially; regenerating; sorbent; resulting; partially; regenerated; completed; slightly; stoichiometric; amount; adequate; essentially; regenerate; occurs; extent; limited; portion; species; contained; removed; therefrom; sulfur sorbent; hot product; sulfate formation; gas desulfurization; product gas; gas stream; gas streams; coal gasification; coal gas; air containing; stoichiometric amount; removed therefrom; stoichiometric quantity; sulfur sorbents; hot-gas desulfurization; generation method; desulfurization sorbents; /502/423/

Citation Formats

Bissett, Larry A, Strickland, Larry D, and Rockey, John M. Method for reducing sulfate formation during regeneration of hot-gas desulfurization sorbents. United States: N. p., 1994. Web.
Bissett, Larry A, Strickland, Larry D, & Rockey, John M. Method for reducing sulfate formation during regeneration of hot-gas desulfurization sorbents. United States.
Bissett, Larry A, Strickland, Larry D, and Rockey, John M. Sat . "Method for reducing sulfate formation during regeneration of hot-gas desulfurization sorbents". United States. https://www.osti.gov/servlets/purl/869507.
@article{osti_869507,
title = {Method for reducing sulfate formation during regeneration of hot-gas desulfurization sorbents},
author = {Bissett, Larry A and Strickland, Larry D and Rockey, John M},
abstractNote = {The regeneration of sulfur sorbents having sulfate forming tendencies and used for desulfurizing hot product gas streams such as provided by coal gasification is provided by employing a two-stage regeneration method. Air containing a sub-stoichiometric quantity of oxygen is used in the first stage for substantially fully regenerating the sorbent without sulfate formation and then regeneration of the resulting partially regenerated sorbent is completed in the second stage with air containing a quantity of oxygen slightly greater than the stoichiometric amount adequate to essentially fully regenerate the sorbent. Sulfate formation occurs in only the second stage with the extent of sulfate formation being limited only to the portion of the sulfur species contained by the sorbent after substantially all of the sulfur species have been removed therefrom in the first stage.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sat Jan 01 00:00:00 EST 1994},
month = {Sat Jan 01 00:00:00 EST 1994}
}