Minimum adverse environmental pulp with feed to chlorate manufacture
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United States of America Patent
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-
Aug 8, 1995
Issued Date -
N/A
app pub date -
Aug 31, 1993
filing date -
Jul 30, 1992
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Liquid effluent from a pulp mill bleach plant having at least one chlorine chemical bleach stage is evaporated and then used in chlorate manufacture. The bleach plant effluent produced by evaporation may be stored and then transported to an off-site chlorate production location, and/or may be subjected to a sodium chloride removal process (such as evaporative crystallization) and only sodium chloride transported to the off-site location. Chlorates produced off site can be returned to the mill (with acid and caustic that are optionally produced) for chlorine dioxide manufacture on site. The chloride-depleted stream from sodium chloride removal may be burned in the mill recovery boiler.
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