B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
182/5, 260/496.6
B01D 15/08 (2006.01) B01D 15/00 (2006.01) C02F 1/28 (2006.01) C02F 9/00 (2006.01) C07C 51/47 (2006.01) C07C 53/08 (2006.01) C07D 307/48 (2006.01)
Patent
CA 1063036
ABSTRACT OF THE DISCLOSURE A lowcost, two-stage adsorption-desorption method of concentrating dilute supplies of chemicals is provided which uses a minimum of energy in the form of process steam and yields highly concentrated supplies of end products which are suitable for re- use or sale. The methods hereof are particularly adapted for con- centrating waste condensates derived from pulp-making operations such as the Kraft or sulfite processes, but in general is also applicable for treating all types of dilute organic or inorganic adsorbable chemicals. The invention involves first adsorbing a chemical fraction from a dilute stream thereof onto activated carbon, followed by regenerating the adsorbed chemicals and con- centrating the same by fractional distillation, whereupon the partially concentrated chemicals are again adsorbed, regenerated, subjected to a second fractional distillation concentration step, and recovered. In preferred alternate procedures, aqueous sulfite waste condensates containing minor amounts of acetic acid, methanol, furfural and sulfur dioxide are treated by the methods hereof to yield concentrated quantities of acetic acid, ethyl acetate or furfural.
254565
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