The addition of chlorine to benzene results in the formation of a mixture of isomeric forms of 1,2,3,4,5,6-hexachlorocyclohexane, as follows: CeHe + 3C12 ->• CgHeCle. The most recent article on this subject (11) describes four isomers, the alpha, beta, gamma, and delta, of a possible sixteen isomers that are proposed. The present paper is concerned with the isolation of the epsilon isomer from the chlorination process product, the physical and chemical properties of the new isomer, infrared absorption spectra,x-ray powder diffraction patterns, and solubility data. WHEN the known isomers of hexachlorocyclohexane• were being separated, it was noted that an impurity was present in some of the fractions. This impurity was first found in the infrared absorption curves and was called impurity A. A sample in which this impurity was especially strong was analyzed, and
Laboratory tests hawe shown that 30 Lo 50% sodium hydroxide solutions react with calcium sulfate scale more completely than do lower concentrations of sodium hydroxide. The oplimum temperatures are above 1 7 P F. Commercial heat exchange units have been treated with 30 to 50y0 sodium hydroxide solutions to remove the calcium sulfate scale. Ai dctailed description is included here for the treatment of a 50,000-
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