Back to results
US 5,330,735 AGranted
Purification of hydrochloric acid
AssigneeDow Corning Corporation
InventorsKirk A. Cronin, William A. Evanko, Alireza Malekadeli
Life of this patent
Estimating the term…
Abstract
A process is described by which numerous waste or by-product aqueous hydrochloric acid streams can be purified by contacting the aqueous hydrochloric acid with a polystyrenic based resin to remove silicon containing impurities and thereby allowing the hydrochloric acid to be re-used for various applications.
Claims11
A process for treating contaminated aqueous hydrochloric acid to remove silane, silanol, or siloxane contained in said hydrochloric acid, the process comprising:
- (I) contacting said hydrochloric acid with a hydrophobic polystyrenic resin for a time sufficient to adsorb said silane, silanol, or siloxane contained in said hydrochloric acid onto the hydrophobic polystyrenic resin, thereby treating said hydrochloric acid;
- and
- (II) separating the treated aqueous hydrochloric acid from the hydrophobic polystyrenic resin.
Dependencies are inferred from the claim text.