Process for the reduction of acidic contaminates in fluorinated hydrocarbons
AssigneeE. I. Du Pont de Nemours and Company
InventorsVelliyur Nott Mallikarjuna Rao, Allen C. Sievert
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Abstract
The present invention relates to processes for reducing the concentration of acidic impurities HF, HCl, HBr, HI, HNO3 and H2SO4 in fluorinated hydrocarbons. The process involves: (i) contacting the fluorinated hydrocarbon with a phosphorous oxyacid salt, and (ii) recovering the fluorinated hydrocarbon having reduced concentration of, or substantially free of, said acidic contaminant, provided that said fluorinated hydrocarbon is not CF3CH2CF3 or CF3CHFCF3.
Claims13
A process for reducing the concentration of at least one acidic contaminant selected from the group consisting of HF, HCl, HBr, HI, HNO3 and H2SO4 in a mixture of at least one fluorinated hydrocarbon and said at least one acidic contaminant comprising:
- contacting said mixture with at least one phosphorous oxyacid salt, wherein if said salt is in aqueous solution, said aqueous solution has a pH of from about 6 to about 10, and
- recovering said at least one fluorinated hydrocarbon having reduced concentration of said at least one acidic contaminant,
- wherein said at least one fluorinated hydrocarbon is selected from the group consisting of:
- (i) unsaturated acyclic fluorinated hydrocarbons of the formula CnHpFq, wherein n is an integer from 2 to 6, p is an integer from 0 to 11, q is an integer from 1 to 12, and the sum of p and q is equal to 2n, and
- (ii) unsaturated cyclic fluorinated hydrocarbons of the formula CtHuFv, wherein t is an integer from 3 to 6, u is an integer from 0 to 9, v is an integer from 1 to 10, and the sum of u and v is equal to 2t−2.
Dependencies are inferred from the claim text.