Concentrating evaporators – Processes – Involving waste liquid
Patent
1975-03-13
1977-01-11
Sofer, Jack
Concentrating evaporators
Processes
Involving waste liquid
159 17VS, 159 49, B01D 126, B01D 100, B01D 122
Patent
active
040025250
ABSTRACT:
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 therefrom, 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 operation is that used for increasing the sensible heat of the evaporator condensate feed within the steam stripping column. The condensed steam and volatile by-products resulting from evaporator heating operation are then preferably directed to a fractionation column or columns in order to separate and recover the valuable by-products for reuse or sale. In situations where the condensate feed contains volatile, noncondensible gases which are valuable for reuse, the evaporator condensate feed may be preheated and contacted with evaporator vent gases. The latter are partially condensed to allow the noncondensible gases to be recovered and reused, and the condensed liquor is cooled and passed through an activated carbon column prior to steam stripping in order to facilitate the recovery of chemical by-products and enhance the purity thereof.
REFERENCES:
patent: 1689534 (1928-10-01), Richter
patent: 3026240 (1962-03-01), Matty
patent: 3183145 (1965-05-01), Collins, Jr.
patent: 3414038 (1968-12-01), Laakso
patent: 3764461 (1973-10-01), Baierl
patent: 3764462 (1973-10-01), Baierl
patent: 3816239 (1974-06-01), Marks
Flambeau Paper Company
Sofer Jack
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