Cocurrent flow process for the manufacture of sodium sulfite...

Details Cocurrent flow process for the manufacture of sodium sulfite... Cocurrent flow process for the manufacture of sodium sulfite...

C - Chemistry, Metallurgy

01

D

C01D 5/14 (2006.01) B01D 53/50 (2006.01) C01B 17/62 (2006.01)

Patent

CA 2057418

Sodium (bi)sulfites are produced by the steps of: (a) introducing a stream of aqueous sodium carbonate into the top end of a main packed column reactor; (b) introducing a stream of sulfur dioxide gas into the top end of the main packed column reactor concurrently with the stream of aqueous sodium carbonate; (c) allowing the aqueous sodium carbonate and sulfur dioxide to cocurrently flow downward from the top end of the main packed column reactor to the bottom of the column in a cocurrent flow, during which flow reaction occurs between the aqueous sodium carbonate and the sulfur dioxide to produce sodium (bi)sulfite; and (d) recovering the product sodium (bi)sulfite and a gas stream containing any excess sulfur dioxide from the bottom of the main packed column reactor. The product (bi)sulfite can be separated from the gas stream in a separate receiving vessel and then the gas is sent to a scrubber to remove residual SO2. The scrubber may be a second packed column reactor operating with cocurrent flow.

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