GB355214A - Improved manufacture of lubricating oils - Google Patents

Abstract

Lubricating oils are obtained by cracking hydrocarbons consisting of not less than 30 per cent of hydrocarbon wax, and polymerizing the product, or fractions thereof, in presence of a polymerizing agent. Suitably, paraffin wax, slop wax, ozokerite, slack wax, or sweat oil is cracked substantially as vapour at 750-1100 DEG F. at atmospheric pressure or pressures below or above 100 lb., and one or more wax-free fractions up to an end point of 500 DEG F. are agitated at 100-250 DEG F. for 3-50 hours in presence of 0.5-4.0 per cent of aluminium chloride. Most of the sludge is removed by settling and decantation; the remainder by filtering with clay fines or other adsorbemt, or by prolonged settling, e.g. 48 hours at 100-150 DEG F. The oil may be neutralized by a 5-10 per cent solution of caustic soda, and freed from light oils and naphtha by distillation. The product may be fractioned to yield oils of desired viscosity. The aluminium chloride sludge may be used to polymerize fresh oil wholly or in part. In an example, slack wax or sweat oil from Midcontinent oil is vaporized, and the vapours are passed at atmospheric pressure through a continuous pipe still or a pipe still and digesting chamber at 900-980 DEG F. The vapours are freed from base and fractionally condensed, condensate above 500 DEG F. being mixed with raw material for cracking. The distillate up to 500 DEG F. is mixed with 1-3 per cent of aluminium chloride, and agitated at 210 DEG F. for 18 hours, Specification 141,753, [Class 91, Oils &c.], is referred to.