Azeotropic and azeotrope-like compositions of z-1,1,1,4,4,4-hexafluoro-2-butene

Abstract

Azeotropic or azeotrope-like compositions are disclosed. The azeotropic or azeotrope-like compositions are mixtures of Z-1,1,1,4,4,4-hexafluoro-2-butene with methyl formate, pentane, 2-methylbutane, 1,1,1,3,3-pentafluorobutane, trans-1,2-dichloroethylene, 1,1,1,3,3-pentafluoropropane, dimethoxymethane, or cyclopentane. Also disclosed is a process of preparing a thermoplastic or thermoset foam by using such azeotropic or azeotrope-like compositions as blowing agents. Also disclosed is a process of producing refrigeration by using such azeotropic or azeotrope-like compositions. Also disclosed is a process of using such azeotropic or azeotrope-like compositions as solvents. Also disclosed is a process of producing an aerosol product by using such azeotropic or azeotrope-like compositions. Also disclosed is a process of using such azeotropic or azeotrope-like compositions as heat transfer media. Also disclosed is a process of extinguishing or suppressing a fire by using such azeotropic or azeotrope-like compositions. Also disclosed is a process of using such azeotropic or azeotrope-like compositions as dielectrics.

1 . A composition consisting essentially of:
 (a) Z-1,1,1,4,4,4-hexafluoro-2-butene; and   (b) a component selected from the group consisting of pentane and 2-methylbutane; wherein said component is present in an effective amount to form an azeotrope-like combination with the Z-1,1,1,4,4,4-hexafluoro-2-butene.   
     
     
         2 . A composition consisting essentially of:
 (a) Z-1,1,1,4,4,4-hexafluoro-2-butene; and   (b) a component selected from the group consisting of pentane and 2-methylbutane; wherein said component is present in an effective amount to form an azeotropic combination with the Z-1,1,1,4,4,4-hexafluoro-2-butene.   
     
     
         3 . The azeotrope-like composition of  claim 1  consisting essentially of from 45 to 99 weight percent Z-1,1,1,4,4,4-hexafluoro-2-butene and from 55 to 1 weight percent pentane, characterized by: at a temperature of from −40° C. to 120° C., said composition having a difference in dew point pressure and bubble point pressure of less than or equal to 5 percent based upon the bubble point pressure. 
     
     
         4 . The azeotrope-like composition of claim  21  consisting essentially of from 1 to 99 weight percent Z-1,1,1,4,4,4-hexafluoro-2-butene and from 99 to 1 weight percent 2-methylbutane, characterized by: at a temperature of from −40° C. to 120° C., said composition having a difference in dew point pressure and bubble point pressure of less than or equal to 5 percent based upon the bubble point pressure.