Azeotrope-like compositions of 1,1,1,3,3-pentachloropropane and carbon tetrachloride
AssigneeHoneywell International Inc.
InventorsHang T. Pham, Rajiv R. Singh, Hsueh Sung Tung
Life of this patent
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Abstract
The invention relates to azeotropic and azeotrope-like mixtures of 1,1,1,3,3-pentachloropropane (HCC-240fa) and carbon tetrachloride and a process for separating the azeotrope-like mixtures. The compositions of the invention are useful as an intermediate in the production of HFC-245fa. The latter is useful as a nontoxic, zero ozone depleting fluorocarbon useful as a solvent, blowing agent, refrigerant, cleaning agent and aerosol propellant.
Claims19
An azeotropic or azeotrope-like composition, which consists essentially of 1,1,1,3,3-pentachloropropane and carbon tetrachloride.
A process for separating 1,1,1,3,3-pentachloropropane from an azeotropic or azeotrope-like composition of 1,1,1,3,3-pentachloropropane and carbon tetrachloride comprising the steps of (A) distilling a composition comprising an azeotropic or azeotrope-like composition of 1,1,1,3,3-pentachloropropane and carbon tetrachloride at a first pressure to produce a first overhead stream enriched in either the 1,1,1,3,3-pentachloropropane or the carbon tetrachloride and a first bottoms stream enriched in the other component;
- and (B) redistilling the first overhead stream at a second pressure to produce a second overhead stream enriched in the component enriched in the first bottoms stream and a second bottoms stream enriched in the component enriched in the first overhead stream.
A process for removing 1,1,1,3,3-pentachloropropane from a mixture containing 1,1,1,3,3-pentachloropropane and at least one impurity, the process comprising adding carbon tetrachloride to a mixture containing 1,1,1,3,3-pentachloropropane and at least one impurity in an amount sufficient to form an azeotropic or azeotrope-like composition of the 1,1,1,3,3-pentachloropropane and the carbon tetrachloride, and thereafter separating the azeotropic or azeotrope-like composition from the impurity.
A method of forming an azeotropic or azeotrope-like composition which comprises combining 1,1,1,3,3-pentachloropropane and carbon tetrachloride in amounts effective and under conditions sufficient to form an azeotropic or azeotrope-like composition consisting essentially of 1,1,1,3,3-pentachloropropane and carbon tetrachloride.
A method of forming an azeotropic or azeotrope-like composition, which comprises combining from about 0.01 to about 10 weight percent 1,1,1,3,3-pentachloropropane and from about 90 to about 99.99 weight percent carbon tetrachloride, which composition has a vapor pressure of about 14.4 psia to about 14.7 psia at about a temperature of about 78° C.
A method which comprises distilling a mixture comprising 1,1,1,3,3-pentachloropropane and carbon tetrachloride to produce a stream comprising an azeotropic or azeotrope-like composition of 1,1,1,3,3-pentachloropropane and carbon tetrachloride.
Dependencies are inferred from the claim text.