Idemitsu Kosan Company, Limited

Nobuo Fujikawa

Tetsuya Saruwatari

Hideki Yamane

The present invention provides an internal olefin composition comprising a mixture of 60 to 80% by mass of an olefin having 16 carbon atoms and 40 to 20% by mass of an olefin having 18 carbon atoms wherein a content of an &#x3b1;-olefin in the mixture is 10% by mass or less, and a content of a branched olefin in the mixture is 10% by mass or less, which has a good biodegradability even when discharged into the environments, a less toxicity against marine organisms, etc., and a sufficient fluidity when used as a base oil for oil drilling, etc.

Internal-olefin composition and base oil comprising the composition for oil drilling

The present invention is a method for producing an internal olefin, wherein an &#x3b1;-olefin containing 50 ppm water or less according to a Karl Fischer test method is contacted with a zeolite catalyst and/or a montmorillonite catalyst for the isomerization thereof and provides an industrially advantageous method for the selective internal isomerization of the raw material &#x3b1;-olefin using a inexpensive catalyst while preventing catalyst deterioration and side reactions such as skeletal isomerization, oligomerization and cracking.

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Chiba, Japan

Nobuo Fujikawa