| abstract |
A process for purifying a gaseous mixture comprising (i) a primary component selected from one or more members of the group consisting of arsine, phosphine, ammonia, and inert gases, and (ii) impurities selected from one or more members of the group consisting of Lewis acids and oxidants, to remove such impurities therefrom, comprising contacting the mixture with a scavenger including a support having associated therewith, but not covalently bonded thereto, a compound which in the presence of the mixture provides an anion which is reactive to effect, either directly or indirectly, the removal of the impurities. Such compound is selected from one or more members of the group consisting of:n (i) carbanion source compounds whose corresponding protonated carbanion compounds have a pK a value of from about 22 to about 36; and (ii) anion source compounds formed by reaction of the carbanion source compounds with the primary component of the mixture. n Also disclosed is an appertaining scavenger composition and a contacting apparatus wherein the scavenger is deployed in a bed for contacting with the impurity-containing mixture. |