Method for producing polybutene

Abstract

The present invention provides a method for producing high reactive polybutene (HRPB) in which carbon-carbon double bond is positioned at an end of polybutene. The method produces polybutene having 300˜5000 of number average molecular weight (Mn) from (a) isobutene, (b) C4 hydrocarbon compounds derived from cracking of naphtha, and containing more than 10 weight % of isobutene, and (c) C4 hydrocarbon compounds derived from a refining process of crude oil or from catalytic cracking of heavy gas oil, and containing more than 10 weight % of isobutene by using catalyst comprising secondary alkylether, tertiary alcohol, and boron trifluoride.

What is claimed is:  
     
         1 . A method of producing polybutene having 300˜5000 of number average molecular weight (Mn) from (a) isobutene, (b) C4 hydrocarbon compounds derived from cracking of naphtha, and containing more than 10 weight % of isobutene, and (c) C4 hydrocarbon compounds derived from a refining process of crude oil or from catalytic cracking of heavy gas oil, and containing more than 10 weight % of isobutene, 
 characterized in that catalyst comprising secondary alkylether, tertiary alcohol, and boron trifluoride is used.  
 
     
     
         2 . The method according to  claim 1 , wherein the secondary alkylether is selected from the group consisting of diisopropylether, di(sec-butyl)ether, di(sec-hexyl)ether, di(sec-octyl)ether and mixtures thereof.  
     
     
         3 . The method according to  claim 1 , wherein the tertiary alcohol is selected from the group consisting of t-butylalcohol, 4-hydroxy-4-methyl-2-pentanone, 2-methyl-2-butanol and mixtures thereof.  
     
     
         4 . The method according to  claim 1 , wherein the polybutene is produced at the temperature of −50˜20° C.  
     
     
         5 . The method according to  claim 1 , wherein the amount of the boron trifluoride is 0.05˜1.0 weight part per 100 weight part of isobutene in raw material.  
     
     
         6 . The method according to  claim 1 , wherein the mole ratio of co-catalyst including the secondary alkylether and tertiary alcohol:the boron trifluoride is 1.0˜2.0:1.  
     
     
         7 . The method according to  claim 1 , wherein the mole ratio of the secondary alkylether/tertiary alcohol is 0.5˜1.2.  
     
     
         8 . The method according to  claim 1 , wherein the catalyst further includes one or more solvent selected from the group consisting of chloromethane, dichloromethane, and chloroform.