United States Patent m
Pinnavaia et al.
[54] METHOD FOR THE PREPARATION OF
HIGHLY REACTIVE CLAY COMPOSITES
FOR THE REMOVAL OF SO* FROM FLUE
GAS STREAMS
[75] Inventors: Thomas J. Pinnayaia; Jayantha
Amarasekera, both of East Lansing,
Mich.
[73] Assignee: Board of Trustees operating Michigan State University, East Lansing, Mich.
[ * ] Notice: The portion of the term of this patent subsequent to Jun. 30, 2009 has been disclaimed.
[21] Appl. No.: 846,583
[22] Filed: Mar. 5,1992
Related U.S. Application Data
[63] Continuation-in-part of Ser. No. 553,254, Jul. 16, 1990, Pat. No. 5,219,536, and a continuation-in-part of Ser. No. 719,987, Jun. 24, 1991, Pat. No. 5,126,300.
[51] Int. CI.5 B01D 53/34; B01J 20/12;
B01J 21/16; C01B 17/60
[52] U.S. a 502/84; 252/189;
252/190; 252/191; 423/244.04; 502/406
[58] Field of Search 252/189, 190, 191, 322;
423/244.04; 502/84, 406 [56] References Cited
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Primary Examiner—Richard D. Lovering
Attorney, Agent, or Firm—Ian C. McLeod
[57] ABSTRACT
The use of base/clay composites materials as sorbents for the removal of SO2 and SO3 (SOx) from flue gas and other sulfur containing gas streams is described. The base is either an alkaline earth metal carbonate (eg. CaC03) or hydroxide (eg. Ca(OH)2) is incorporated onto the clay by precipitating from corresponding metal oxide (eg. CaO) in an aqueous clay slurry. A second metal oxide or oxide precursor, preferably selected from transition metal ions, capable of promoting the oxidation of sulfur dioxide to sulfur trioxide, is incorporated to the base/clay composite during the synthesis in the form of finely divided metal oxide powder, metal oxide sol, water soluble metal salt or as clay-intercalated metal cation. The use of clay as dispersing agent for both the basic oxide and the second metal oxide component decreases the particle agglomeration of base particles and increases the rate of SO* uptake compared to the bulk bases in current use.
64 Claims, 3 Drawing Sheets
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