Novel preparation method of macroporous lime from limestone for high-temperature desulfurization

Journal Article · Mon Sep 01 04:00:00 EDT 1997 · Industrial and Engineering Chemistry Research

DOI:https://doi.org/10.1021/ie970134u· OSTI ID:538228

Sasaoka, Eiji ^[1]; Uddin, M A ^[2]; Nojima, Shigeru ^[3]

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1. Okayama Prefectural Univ., Soja, Okayama (Japan). Faculty of Health and Welfare Science
2. Okayama Univ., Tsushima, Okayama (Japan). Faculty of Engineering
3. Mitsubishi Heavy Industries, Ltd., Hiroshima (Japan)

Limestone is a very important material as a high temperature desulfurization sorbent: limestone is used for in-bed SO{sub 2} capture in fluidized bed combustors of coal and can be used in coal gasifiers for the in-bed removal of H{sub 2}S. In order to develop a highly active calcium oxide high-temperature desulfurization sorbent, macroporous calcium oxides were directly prepared from limestone. This method is composed of two steps: swelling of the limestone in the gas phase followed by drying and calcination of the swelled samples. The swelling was found when limestone was exposed to a vapor of aqueous acetic acid. The swelling of the sample resulted from an increase of calcium acetate formation in the sample. It was then converted to macroporous calcium oxides by heating the sample to 850 C. The reactivity of the macroporous calcium oxide for the removal of SO{sub 2} or H{sub 2}S under coexisting H{sub 2}O vapor was higher than that of the calcined raw limestone. In particular, its SO{sub 2} removal capacity and oxidative character of CaS to CaSO{sub 4} and CaO were greatly improved by the swelling method.

• OSTI ID: 538228
• Journal Information: Industrial and Engineering Chemistry Research, Journal Name: Industrial and Engineering Chemistry Research Journal Issue: 9 Vol. 36; ISSN IECRED; ISSN 0888-5885
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
40 CHEMISTRY
ADSORBENTS
CALCINATION
CALCIUM OXIDES
CHEMICAL PREPARATION
DRYING
HYDROGEN SULFIDES
LIMESTONE
SORBENT INJECTION PROCESSES
SORPTIVE PROPERTIES
SULFUR DIOXIDE
SWELLING