Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Including recovery of organic by-product
Patent
1976-10-18
1978-01-31
Bashore, S. Leon
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
Including recovery of organic by-product
162 16, 203 41, 203 74, 203 78, 203 98, 203DIG11, 210 26, 210 34, 210 40, D21C 1106
Patent
active
040713989
ABSTRACT:
A continuous, low cost method of concentrating dilute streams containing fractions of adsorbable chemicals is disclosed which minimizes heat consumption and provides highly concentrated supplies of valuable chemicals which are suitable for reuse or sale without substantial further processing. 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 are also applicable for treating a wide variety of dilute organic or inorganic adsorbable chemicals. The invention involves initially adsorbing and concentrating a chemical fraction from the dilute stream followed by desorption and recycling of the adsorbed materials to further concentrate the same, whereupon the desorbed chemicals are directed to a second concentration zone and concentrated therein; at this point the partially concentrated steam is diverted back to the adsorption zone for further adsorption and concentration simultaneously with the dilute stream initially passing therethrough, while concentration continues in the second zone to yield a final product having a concentration on the order of 90% by weight or better. In preferred forms only a single fractionating column is employed in the second concentration stage which minimizes capital costs and reduces steam consumption, while recycling back to the adsorption zone permits continuous operation of one fractionation column doing the work of two or more columns. Thus, dual use of the single fractionator column in both intermediate and final concentration steps allows continuous operations with equipment heretofore used only in batch-type operations.
REFERENCES:
patent: 3448042 (1969-06-01), Mattia et al.
patent: 3499935 (1970-03-01), King
Baierl et al. "Tapoi" vol. 56, No. 7, July, 1973, pp. 58-61.
Bashore S. Leon
Flambeau Paper Company
Smith William F.
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