A nonflammable solvent composition comprises, based on the total weight of trans-1,2-dichloroethylene, (E)-1-chloro-2,3,3-trifluoroprop-1-ene, and (Z)-1-chloro-2,3,3-trifluoroprop-1-ene: about 80 wt. % to about 99.99 wt. % of trans-1,2-dichloroethylene; and about 0.01 wt. % to about 20 wt. % of at least one of (E)-1-chloro-2,3,3-trifluoroprop-1-ene or (Z)-1-chloro-2,3,3-trifluoroprop-1-ene; wherein the nonflammable solvent composition has no fire point over a temperature range of 10 C. to the boiling point of the solvent composition, measured according to any one or more of ASTM D92-18, ASTM D1310-14, or ASTM D56-22. Methods for preparing a nonflammable solvent composition from trans-1,2-dichloroethylene and for increasing the fire point of trans-1,2-dichloroethylene comprises mixing the trans-1,2-dichloroethylene with about 0.01 wt. % to about 20 wt. % of at least one of (E)-1-chloro-2,3,3-trifluoroprop-1-ene or (Z)-1-chloro-2,3,3-trifluoroprop-1-ene to form a nonflammable solvent composition having no fire point over a temperature range of 10 C. to the boiling point of the solvent composition.

A refrigerant composition includes about 90-92 wt % difluoromethane and about 8-10 wt % pentafluoroethane. The refrigerant composition is formed from all recycled materials, and the refrigerant composition is a zeotrope. A method of preparing the refrigerant composition includes injecting a mixture of recovered refrigerants into the center of a distillation column, the mixture of injected refrigerants being difluoromethane, pentafluoroethane and chlorodifluoromethane, removing from the top of the distillation column a refrigerant composition of about 90-92 wt % difluoromethane and about 8-10 wt % pentafluoroethane, and removing chlorodifluoromethane from a bottom of the distillation column.