Preparation of macroporous lime from natural lime by swelling method with acetic acid for high-temperature desulfurization

Eiji Sasaoka, Norimasa Sada, Md Azhar Uddin

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20 Citations (Scopus)

Abstract

To develop a highly active calcium oxide high-temperature desulfurization sorbent, a method of preparation of macroporous calcium oxides from lime was studied. This method is composed of two steps: swelling of the lime and calcination of the swelled sample. Swelling occurred when lime was exposed to the vapor of acetic acid. The swelling resulted from calcium acetate formation in the sample. The swelling rate was at a maximum in the presence of acetic acid and depressed by the presence of water vapor. The swelled sample was converted to macroporous calcium oxide by heating to 850 °C. The reactivity of the macroporous calcium oxide for the removal of SO2 or H2S in the presence of H2O vapor was higher than that of the calcined raw limestone. In particular, its SO2 removal capacity and the oxidative character of CaS to CaSO4 and CaO were greatly improved by this swelling method. These characteristics were also compared with those of a sample prepared from limestone by this swelling method.

Original languageEnglish
Pages (from-to)3943-3949
Number of pages7
JournalIndustrial and Engineering Chemistry Research
Volume37
Issue number10
DOIs
Publication statusPublished - Jan 1 1998

Keywords

  • Limestone
  • Sorption
  • Sulfur dioxide

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

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