C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
260/533.1
C07C 59/265 (2006.01) B01D 53/50 (2006.01) C02F 1/04 (2006.01) C07C 51/43 (2006.01)
Patent
CA 1127184
ABSTRACT OF THE DISCLOSURE A process for the selective recovery of sodium citrate from a solution utilized as the absorption medium in a closed loop absorption/stripping process for the recovery of sulfur dioxide (SO2), is described herein. This sodium citrate recovery process is characterized by taking a slip stream from the circulation loop and sending it through a cooling device. It is then cooled to a temperature of 14°C, or lower, which causes the precipitation of sodium sulfate. The precipitate is separated from the mother liquor and thereby removed from the system. The mother liquor is then heated (to a temperature of at least 40°C.) such that water can be evaporated, resulting in a system volume reduction to less than 20% of its original or more preferably to less than 10%. This will cause the precipitation of sodium citrate thereby permitting ease of separation and return back to the absorbant solution. The remaining mother liquor is then further, slowly, cooled to about 25 to 40°C, where additional sodium citrate is precipitated and separated. Finally, the remaining mother liquor, which is almost barren of sodium citrate and sodium sulfate, can be totally or partially removed from the system.
338313
Bengtsson Sune
Lillestolen Tom
Aktiebolaget Svenska Flaktfabrieken
Gowling Lafleur Henderson Llp
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