Chemistry of carbon compounds – Miscellaneous organic carbon compounds – C-metal
Patent
1975-06-18
1977-04-05
Jiles, Henry R.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
C-metal
260428, 260499, 260541, 260598, 260627R, 260643G, 260674A, 162 16, 210 26, 423659, C07D30749, B01D 1506, B01D 1508, C07C 5308
Patent
active
040161803
ABSTRACT:
A low cost, 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 reuse or sale. The methods hereof are particularly adapted for concentrating 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 concentrating 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.
REFERENCES:
patent: 1960812 (1934-05-01), Groth et al.
patent: 2422504 (1947-06-01), Spence
patent: 2779770 (1957-01-01), Cass
Lynam et al., The Industrial Chemist, p. 109, Mar. 1950.
Mantell, Adsorption, New York, McGraw-Hill, p. 243.
Dentz Bernard
Flambeau Paper Company
Jiles Henry R.
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