EPA Science Inventory

IDENTIFICATION OF CASO4 FORMED BY REACTION OF CAO AND SO2

Citation:

Gullett*, B K. AND K. R. Bruce. IDENTIFICATION OF CASO4 FORMED BY REACTION OF CAO AND SO2. AMERICAN INSTITUTE OF CHEMICAL ENGINEERS JOURNAL 35(10):1739-1741, (1989).

Description:

The injection of calcium-based sorbents into coal-fired boilers for reaction with, and reduction in the levels of, sulfur dioxide (SO2) in the flue gas has undergone considerable research and development. Significant effort has also been made in developing models for the overall reaction CaO + SO2 + 1/2 O2 <-> CaSO4 in order to better predict the effects of system and sorbent variables upon performance. The article discusses the XRD-determination of the identity of CaSO4, formed by the reaction between CaO and SO2, and the support of that determination by density measurements with helium pycnometry. The anhydrous CaSO4 compound formed has an orthorhombic crystal structure and an analytically calculated density of 2.98 g/cu cm, versus the JCPDS reported value of 2.995 g/cu cm. The product of the reaction, formed during calcium-based sorbent injection for SO2 removal from coal-fired power plants, has largely been assumed to have a density of 2.61 g/cu cm. Since reaction models must incorporate the product density in determining the rate of sorbent pore blockage or filling, correct identification of the reaction product is crucial.

Record Details:

Record Type: DOCUMENT (JOURNAL/PEER REVIEWED JOURNAL)
Start Date: 10/01/1989
Completion Date: 10/01/1989
Record Last Revised: 07/11/2007
Record Created: 12/08/2004
Record Released: 04/02/2005
OMB Category: Other
Record ID: 121268

Organization:

U.S. ENVIRONMENTAL PROTECTION AGENCY

OFFICE OF RESEARCH AND DEVELOPMENT

NATIONAL RISK MANAGEMENT RESEARCH LABORATORY

AIR POLLUTION PREVENTION AND CONTROL DIVISION

AIR POLLUTION TECHNOLOGY BRANCH