METHOD OF PREPARING POLYMER ADDITIVES FOR DIESEL FUELS AND LUBRICATING OILS Russian patent published in 2005 - IPC

FIELD: petroleum processing and petrochemistry.

SUBSTANCE: raw material in the form of ground synthetic rubber containing ethylene/propylene copolymer is heated uniformly throughout all the bulk to depolymerization temperature in reactor provided with rotor mechanism. Resulting depolymerizate is removed and kept at depolymerization temperature under an inert gas atmosphere. When preparing raw material, a sample of starting rubber is taken, in which molecular-mass composition and densities at wave numbers 810. 1150, and 4310 cm^-1 are measured and then ratio a/bc is determined, where a is optical density of raw material at 810 cm^-1, b the same at 1150 cm^-1, and c the same at 4310 cm^-1. Raw material having a/bc value not more than 1.5 is appropriate. Raw material is fed under an inert gas atmosphere. Depolymerization temperature is set by varying rotational speed of the rotor mechanism in dependence on molecular-mass composition of raw material and type of additive to be prepared.

EFFECT: improved reproducibility of physicochemical characteristics and qualitative characteristics required by industry.

3 cl, 3 ex