Purification, purity, and freezing points of 31 hydrocarbons of the API-NBS series

This report describes the purification and determination of freezing points and purity of 31 hydrocarbons of the API-NBS series, including 2 pentanes, 5 hexanes, 2 heptanes, 1 octane, 3 alkylcyclopentanes, 3 alkylcyclohexanes, and 15 alkylbenzenes. I. IntroductionIn May 1943, the Advisory Committee for the American Petroleum Institute Hydrocarbon Research Committee, operating the API Hydrocarbon Research Project 3 at the Ohio State University, requested the American Petroleum Institute Research Project 6 at the National Bureau of Standards to begin purification of a series of hydrocarbon compounds of the highest practicable purity, under the label API-NBS hydrocarbons.This work was begun July 1, 1943, with a large number of compounds of relatively high purity being supplied by the API