Purification, Purity, and Freezing Points of 16 API Standard and API Research Hydrocarbons.

Abstract

THIS INVESTIGATION is a continuation of the work of producing highly purified hydrocarbons of the API Standard and API Research series (3). The purification and determination of purity and freezing points of 16 hydrocarbons, which include three cycloparaffins, four monoolefins, one cyclo-olefin, six alkyl benzenes, and two alkylidene-cycloparaffins are described.The final lots of material labeled API Standard are sealed in vacuum in glass ampoules and made available as API Standard samples of hydrocarbons through the American Petroleum Institute Samples and Data Office at the Carnegie Institute of Technology. The material labeled API Research is made available in appropriate small lots through the American Petroleum Institute Research Project 44 for loan to qualified investigators for the measurement of needed physical, thermodynamic, and spectral properties.Table I gives the names of the compounds, details concerning the first and succeeding distillations, and the character of the plot of the freezing point of the hydrocarbon part of the distillate as a function of its volume.The procedures followed in the process of purification and determination of purity were the same as in previous articles (3). Details of the distillation apparatus and operations have been described (2). Beginning July 1, 1957, determination of the purity of the best lot of each hydrocarbon completed is being made calorimetrically with the apparatus recently described (7). The compounds reported in this article were completed before this new apparatus was placed in formal service.