FIELD: chemical or physical processes.
SUBSTANCE: disclosed is a method for oligomerisation of ethylene (versions), where one of the versions includes: A) continuously introducing into reaction zone i) ethylene, ii) bis(imino)pyridine complex with iron salt, where the bis(imino)pyridine of the bis(imino)pyridine complex with the iron salt is i) 2,6-bis[(arylimine)hydrocarbyl]pyridine, in which the aryl groups can be identical or different, ii) bis[(substituted arylimine)hydrocarbyl]pyridine, in which the substituted aryl groups can be identical or different, or iii) [(arylimine)hydrocarbyl], [(substituted arylimine)hydrocarbyl]pyridine, and iron salt of bis(imino)pyridine complex with iron salt has formula FeXn, where n is equal to 2 and X is a monoanionic particle, iii) organoaluminium compound containing aluminoxane, and iv) an organic reaction medium containing one or more C8-C18 aliphatic hydrocarbons; as well as B) formation of oligomer product in reaction zone, wherein reaction zone has i) concentration of iron in complex of bis(imino)pyridine with iron salt in range from 5 × 10–4 mmol/kg to 5 × 10–3 mmol/kg, ii) molar ratio of aluminum in an organoaluminium compound to iron in a complex of bis(imino)pyridine with an iron salt in range from 300:1 to 800:1, iii) an ethylene partial pressure in range of 750 pounds per square inch to 1,200 pounds per square inch, iv) a weight ratio of ethylene to the organic reaction medium of 0.8:1 to 4.5:1, and v) average temperature in range from 75 °C to 95 °C; and, optionally, vi) hydrogen partial pressure of at least 5 pounds per square inch.
EFFECT: technical result is an oligomerisation method having higher process flexibility, including balancing catalyst activity with simultaneous attenuation of reactor contamination effects.
12 cl, 4 tbl, 14 ex, 1 dwg
