Process for separating polymeric contaminants from aqueous absor

Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Carbon dioxide or hydrogen sulfide component

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Details

423228, 423229, 423232, 423234, 423242, 423243, 260677A, 260679A, 260683R, 210 42R, B01D 5334

Patent

active

041138376

ABSTRACT:
Novel process for removing polymer from aqueous absorbent solutions used to contact organic gas-containing gas streams comprising the steps of adjusting the polymer-containing aqueous absorbent solutions to a pH of not more than about 8.5, preferably not more than about 7.5, for example, about 6.0 to about 8.5, preferably about 7.0 to about 7.5, and removing the polymer from the resulting solutions by decantation and/or filtration. The novel process is particularly applicable to the system of removing acid gas from hydrocarbon-containing feed gases which contain one or more polymerizable components wherein the feed gas is contacted with an aqueous absorbent solution which absorbs the acid gas and, thereafter, the absorbent solution is stripped to rid it of said acid gas. The adjustment of pH can be accomplished by increasing the acid gas loading in the aqueous absorbent or by adding an acid, preferably one which will not form a heat stable salt with the absorbent. The pH adjustment, e.g., acidification, and filtration can be performed on the total mainstream or a portion thereof, i.e., a sidestream, before it is stripped.

REFERENCES:
patent: 2497954 (1950-02-01), McCulley
patent: 3598881 (1968-10-01), Kniel et al.
patent: 3660016 (1972-05-01), John et al.
patent: 3696162 (1972-10-01), Kniel
patent: 3911082 (1975-10-01), Rottmayer et al.
patent: 3926591 (1975-12-01), Wildmoser et al.

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