D - Textiles – Paper – 21 – C
Patent
D - Textiles, Paper
21
C
9/36.9
D21C 11/10 (2006.01) C02F 9/00 (2006.01) D21C 11/06 (2006.01)
Patent
CA 1075410
CHEMICAL RECOVERY UTILIZING EVAPORATION STEAM AND EXCHANGERS IN STEAM STRIPPING SYSTEM ABSTRACT OF THE DISCLOSURE A method of treating waste liquors such as those derived from the sulfite or Kraft pulp making process is disclosed which provides recovered by-products of high purity while moreover decreasing the total amount of process steam required. The method comprises steam stripping the evaporator condensate feed to remove volatile chemical by-products there- from, and thereafter directing the stripping steam for reuse in concentrating additional volumes of feed in the evaporator. In this manner, the only steam lost during the stripping opera- tion is that used for increasing the sensible heat of the evapo- rator condensate feed within the steam stripping column. The condensed steam and volatile by-products resulting from evapo- rator heating operation are then preferably directed to a fractionation column or columns in order to separate and re- cover the valuable by-products for reuse of sale. In situa- tions where the condensate feed contains volatile, nonconden- sible gases which are valuable for reuse, the evaporator con- densate feed may be preheated and contacted with evaportator vent gases. The latter are partially condensed to allow the noncondesible gases to be recovered and reused, and the con- densed liquor is cooled and passed through an activated carbon column prior to steam stripping in order to facilitate the re- covery of chemical by-products and enhance the purity thereof.
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