| 摘要 |
The process for producing synthetic lubricating oils of high viscosity index, high thermal stability and extremely low carbonaceous residue starts from polymers of extremely high viscosity, having a boiling point above 175 DEG C. These polymers are obtained by polymerisation of normal alpha-olefins of the general formula R-CH=CH2, where R is an alkyl radical having 2 to 16 carbon atoms. The polymerisation is carried out in the presence of the TiCl4/polyimine-alane catalyst in an atmosphere which is inert or at least partially replaced by hydrogen. These polymers are subjected to a catalytic hydrocracking treatment at temperatures varying from 300 to 400 DEG C. The hydrogen pressure is between 20 and 200 kg/cm<2>. The product is then distilled in vacuo up to a top temperature of 400 DEG C, relative to atmospheric pressure. Finally, the fraction of boiling point above 400 DEG C is separated off. |
