Production of sodium bicarbonate by reversion of soda-type feed salt
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United States of America Patent
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Mar 31, 1987
Issued Date -
N/A
app pub date -
Jul 16, 1985
filing date -
Aug 18, 1983
priority date (Note) -
Expired
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Abstract
Sodium bicarbonate is produced by introducing solid sodium carbonate, sodium sesquicarbonate, and/or Wegscheider's salt into a reversion slurry, saturated with respect to bicarbonate and containing at least 10 wt. % solids, to effect rapid and complete conversion of the feed solids to crystalline sodium bicarbonate which is recovered from the slurry. Carbon dioxide is introduced into the reversion liquor to maintain its composition at a relatively constant value, preferably in a region of the Na.sub.2 CO.sub.3 --NaHCO.sub.3 --H.sub.2 O phase diagram that minimizes the equilibrium partial pressure of CO.sub.2 vapor above such liquor.
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