Method for producing internal olefin, internal olefin mixture, and oil drilling fluid containing internal olefin mixture

Abstract

A method for producing an internal olefin by stably isomerizing an α-olefin by using an inexpensive zeolite catalyst while preventing an oligomerization reaction is provided. The method for producing an internal olefin comprises a step of isomerizing an α-olefin having from 16 to 18 carbon atoms by passing through a zeolite catalyst bed, wherein the α-olefin having from 16 to 18 carbon atoms is circulated through and brought into contact with the zeolite catalyst bed before starting the isomerization reaction.

1 . A method for producing an internal olefin, comprising a step of isomerizing an α-olefin having from 16 to 18 carbon atoms by passing through a zeolite catalyst bed, an α-olefin having from 16 to 18 carbon atoms being circulated through and brought into contact with the zeolite catalyst bed before starting the isomerization reaction. 
     
     
         2 . The method for producing an internal olefin according to  claim 1 , wherein the zeolite catalyst is an MFI type zeolite. 
     
     
         3 . The method for producing an internal olefin according to  claim 1 , wherein the total amount of the α-olefin to be circulated is from 1 to 20 times of the zeolite catalyst by volume. 
     
     
         4 . The method for producing an internal olefin according to  claim 1 , wherein an LHSV (liquid hourly space velocity) of the α-olefin to be circulated is from 0.1 to 10 h -1 . 
     
     
         5 . The method for producing an internal olefin according to  claim 1 , wherein the temperature of the catalyst bed at the circulation of the α-olefin is from 70 to 180° C. 
     
     
         6 . The method for producing an internal olefin according to  claim 1 , wherein the circulation time of the α-olefin is from 1 to 100 hours. 
     
     
         7 . An internal olefin mixture having from 16 to 18 carbon atoms obtained by the method according to  claim 1 . 
     
     
         8 . A base oil for petroleum drilling oils containing the internal olefin mixture having from 16 to 18 carbon atoms according to  claim 7 .