B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
182/5, 260/373.7
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 1063522
ABSTRACT OF THE DISCLOSURE A continuous, low cost method of concentrating dilute streams containing fractions of adsorbable chemicals is dis- closed which minimizes heat consumption and provides highly con- centrated supplies of valuable chemicals which are suitable for reuse or sale without substantial further processing. The meth- ods hereof are particularly adapted for concentrating waste con- densates 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 adsorb- able 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 direc- ted 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 there- through, 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 fraction- ating 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 opera- tion 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 contin- uous operations with equipment heretofore used only in batch-type operations.
254570
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