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Title: Zinc titanate sorbents

Abstract

The present invention provides a zinc titanate sorbent material useful in desulfurization applications. The zinc titanate material is in the form of generally spherical particles of substantially uniform chemical distribution. The sorbent material is capable of absorbing sulfur compounds from a gaseous feed in an amount of at least about 15 weight percent based on the weight of the sorbent. The sorbent material is prepared by a process including: (a) forming a zinc oxide/titanium dioxide dry blend, (b) preparing a substantially uniform aqueous slurry comprising the zinc oxide/titanium dioxide dry blend, organic binder, and at least about 1 weight percent inorganic binder based on the solids weight of the slurry, (c) spray drying the slurry to produce substantially spherical particles, and (d) calcining the particles at a temperature of between about 750 to about 950 C. The dry blend is formed by mixing between about 0.5 to about 2 parts zinc oxide having a median particle size of less than about 0.5 microns, and about 1 part titanium dioxide having a median particle size of less than about 1 micron. The slurry contains substantially no free silica and may be prepared by the process including (1) preparing an aqueous solutionmore » of organic binder, (2) adding the dry blend to the aqueous solution of organic binder, and (3) adding the inorganic binder to the solution of organic binder, and blend. Additional reagents, such as a surfactant, may also be incorporated into the sorbent material. The present invention also provides a process for desulfurizing a gaseous stream. The process includes passing a gaseous stream through a reactor containing an attrition resistant zinc titanate sorbent material of the present invention.« less

Inventors:
; ;
Publication Date:
Research Org.:
Research Triangle Institute
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
570486
Patent Number(s):
US 5,714,431/A/
Application Number:
PAN: 8-325,853
Assignee:
Research Triangle Inst., Research Triangle Park, NC (United States) PTO; SCA: 010402; 360601; PA: EDB-98:027029; SN: 98001912324
DOE Contract Number:  
AC21-88MC25006
Resource Type:
Patent
Resource Relation:
Other Information: PBD: 3 Feb 1998
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; 36 MATERIALS SCIENCE; HOT GAS CLEANUP; ADSORBENTS; CHEMICAL PREPARATION; ZINC COMPOUNDS; TITANATES; DESULFURIZATION; ZINC OXIDES; TITANIUM OXIDES; CALCINATION; PARTICLE SIZE

Citation Formats

Gupta, R.P., Gangwal, S.K., and Jain, S.C. Zinc titanate sorbents. United States: N. p., 1998. Web.
Gupta, R.P., Gangwal, S.K., & Jain, S.C. Zinc titanate sorbents. United States.
Gupta, R.P., Gangwal, S.K., and Jain, S.C. Tue . "Zinc titanate sorbents". United States.
@article{osti_570486,
title = {Zinc titanate sorbents},
author = {Gupta, R.P. and Gangwal, S.K. and Jain, S.C.},
abstractNote = {The present invention provides a zinc titanate sorbent material useful in desulfurization applications. The zinc titanate material is in the form of generally spherical particles of substantially uniform chemical distribution. The sorbent material is capable of absorbing sulfur compounds from a gaseous feed in an amount of at least about 15 weight percent based on the weight of the sorbent. The sorbent material is prepared by a process including: (a) forming a zinc oxide/titanium dioxide dry blend, (b) preparing a substantially uniform aqueous slurry comprising the zinc oxide/titanium dioxide dry blend, organic binder, and at least about 1 weight percent inorganic binder based on the solids weight of the slurry, (c) spray drying the slurry to produce substantially spherical particles, and (d) calcining the particles at a temperature of between about 750 to about 950 C. The dry blend is formed by mixing between about 0.5 to about 2 parts zinc oxide having a median particle size of less than about 0.5 microns, and about 1 part titanium dioxide having a median particle size of less than about 1 micron. The slurry contains substantially no free silica and may be prepared by the process including (1) preparing an aqueous solution of organic binder, (2) adding the dry blend to the aqueous solution of organic binder, and (3) adding the inorganic binder to the solution of organic binder, and blend. Additional reagents, such as a surfactant, may also be incorporated into the sorbent material. The present invention also provides a process for desulfurizing a gaseous stream. The process includes passing a gaseous stream through a reactor containing an attrition resistant zinc titanate sorbent material of the present invention.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1998},
month = {2}
}