Abstract: A method of testing for contaminating mineral oil in a sample of synthetic ester lubricating oil from mechanical vapor recompression type heat transfer equipment in a system which is to be retrofilled with hydrohalocarbon working fluid, comprises mixing a predetermined quantity of the synthetic ester lubricating oil with a predetermined quantity of a polar liquid or a mixture of polar liquids and determining whether the resulting mixture is clear or turbid, an optically clear mixture indicating non-saturation by the contaminating mineral oil and that the concentration of contaminating mineral oil in the synthetic ester lubricant is below the maximum tolerable concentration and that the system can therefore be safely retrofilled with the hydrohalocarbon working fluid; and an optically turbid mixture indicating saturation by the contaminating mineral oil and that the concentration of contaminating mineral oil is above the maximum tolerable concentration and that the system must therefore be reflushed with synth

Abstract: The use of mixtures of 1,1,1,2-tetrafluoroethane and an ester having a molecular weight of greater than 250 as retrofill working fluid/lubricant combinations for mechanical vapor recompression heat transfer devices. Despite the presence of residual lubricant, e.g. hydrocarbon lubricants, from working fluid/lubricant combinations in which working fluids such as R12, R22, R502 or R511 are used, anticipated problems resulting from immiscibility such as excessive wear have not been observed.

Abstract: Primary normal monochloroparaffins are produced in high yields in a chlorination process of normal paraffins by the recycling technique of the present invention. By the recycling of secondary and nonprimary monochloroparaffin to the chlorination zone and the treatment of the polychlorinated compounds formed in the chlorination to form the primary normal monochloroparaffins and a recycle stream of paraffin and nonprimary monochloroparaffin, normal paraffins may be converted essentially completely to the desired primary normal monochloroparaffins. In a specific aspect of the present invention, alpha, omega-dichloroparaffins may be recovered if desired.