Method of producing calcium sulfate alpha-hemihydrate
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United States of America Patent
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Nov 25, 2003
Grant Date -
Nov 7, 2002
app pub date -
May 1, 2001
filing date -
May 1, 2001
priority date (Note) -
Expired
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Abstract
A method of producing calcium sulfate .alpha.-hemihydrate is disclosed, including the steps of exposing a mixture including a calcium sulfate form selected from the group consisting of calcium sulfate dihydrate, calcium sulfate .beta.-hemihydrate, water-soluble calcium sulfate anhydrite, and mixtures thereof, water, and a crystallization catalyst, to microwave radiation to produce calcium sulfate .alpha.-hemihydrate; and separating at least a portion of the calcium sulfate .alpha.-hemihydrate to provide a solid comprising calcium sulfate .alpha.-hemihydrate and a filtrate and/or remainder that can be recycled to provide at least one of a calcium sulfate form, water, a crystallization catalyst, a crystal habit modifier, and a surfactant for use in production of additional .alpha.-hemihydrate.
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