PATENTS

2999. ----- [RUHRCHEMIE, A. G.]  [Polymerizing Hydrocarbons.  British Patent 503,206, Apr. 3, 1939.  Chem. Abs., vol. 33, 1939, p. 7093.

The viscosity of lubricating oils produced synthetically by the polymerization of benzine (I) hydrocarbons is influenced by varying the quantity of condensation agent, the condensation temperature, and the time of condensation.  The temperature limits are 20°-120° and the time limits are 12-20 hr.  About 5% of AlCl₃ is added to the 1^st charge of cracked (I) to be converted, instead of the usual 1%.  The contact layer left after separation of the upper layer containing the condensation products serves after reactivation, for the conversion of a new charge of cracked (I) by adding a small quantity, such as, about 0.5-2%, of fresh AlCl₃.  The original contact layer can be used repeatedly by such reactivation.  In an example, 15,000 gm of dried cracked (I) and a quantity of fresh AlCl₃ are added in an autoclave to AlCl₃ already used to convert cracked (I) and the contents allowed to react 12 hr.; the amount AlCl₃ added with the (I) and the temperature of the reaction are found to have a direct influence on the viscosity of the resulting oil and by adjustment of the above factors thin or thick oils are produced from the same starting (I) for producing oils of low viscosity about 0.5-0.7% of AlCl₃ is used and for oils of high viscosity about 0.7-1% is added, the amount being calculated on the quantity of (I) added.

See also Canadian Patent 375,982.