Experience in producing dewaxed cut for “VMGZ” oil base stock

In the production of base stock VMGZ oil, a given viscosity, solid point, and initial boiling point, are required. The Moscow Petroleum Company mixed West Siberian and Ramaschinko crudes in this process to obtain proper specifications. But when they used paraffinic Usa crude off-specification batches were obtained. It became necessary to investigate the nature of the crude oil on the quality of the base stock. Usa crude, the study found, has a higher solid point, lower viscosity. Heavier cuts (with boiling points in the 280-5 C range) must be used. A mixture of 50% West Siberian and Romanian and 50% USA crude was also tested. This mixture meets requirements if the boiling point is no lower than 280 C. The results indicate that the distillation range of the deepstock is selected according to the nature of the crude, a finding which makes it possible to avoid off-specification.