Patent ID: 7767614

Claim:
A method for preparing a spherical support for olefin catalysts, which comprises reacting metal magnesium with an alcohol in the presence of a reaction initiator, characterized in that the reaction initiator is a halogenated nitrogen compound selected from the group consisting of the compounds represented by the following general formulas I-IV, wherein the halogenated nitrogen compound is used at the amount of 0.001-0.2 parts by weight, based on 1 part by weight of the metal magnesium, and the alcohol is used at the amount of 5-50 parts by weight, based on 1 part by weight of the metal magnesium: wherein, X refers to halogen, and R 1 , R 2 , R 3 and R 4 are independently hydrogen, or alkyl or aryl having C 1-12 ; wherein, X refers to halogen; wherein, x refers to halogen, and R 1 , R 2 , R 3 and R 4 are independently hydrogen, or alkyl or aryl having C 1-12 ; wherein, x refers to halogen, and R 1 and R 2 are independently hydrogen, or alkyl or aryl having C 1-12 .