Zeon Corporation

Yoshihide Yachi

Kei Sakamoto

Hideaki Miki

Naoto Kogoshi

Provided is a method for producing 1,3-butadiene that enables 1,3-butadiene to be obtained in a high yield while preventing abnormal reaction of a fraction containing vinylacetylene in high concentration. The method for producing 1,3-butadiene is a method for producing 1,3-butadiene from a fraction produced in separation and recovery of 1,3-butadiene from a Chydrocarbon mixture that includes: adding a diluent to a high VA fraction containing vinylacetylene to produce a diluted fraction; and subjecting the diluted fraction to hydrogenation treatment to produce 1,3-butadiene. Substantially only a low VA fraction is used as the diluent. The low VA fraction is a fraction that is produced in separation and recovery of 1,3-butadiene from the Chydrocarbon mixture and has a lower vinylacetylene concentration than the high VA fraction.

Method and apparatus for producing 1,3-butadiene

Provided is a hydrogenation method that with respect to a hydrocarbon mixture containing 1,3-butadiene and vinylacetylene, enables hydrogenation of vinylacetylene while inhibiting reduction of 1,3-butadiene concentration. The hydrogenation method is a method of hydrogenating a hydrocarbon mixture containing 1,3-butadiene and vinylacetylene that includes a step of bringing the hydrocarbon mixture and a hydrogenation catalyst into contact in the presence of hydrogen to hydrogenate at least vinylacetylene. The hydrocarbon mixture contains 1 mass % or more of vinylacetylene. The hydrogenation catalyst includes palladium and has a CO adsorption amount of 0.5 cm/g or less.

Hydrogenation method

A method for producing a hydrocarbon material from a Craffinate which is obtained as an extracted residual oil after separating at least part of the isoprene by extraction distillation from a Cfraction which is produced as a byproduct when thermally cracking naphtha to produce ethylene and has Corganic compounds as main ingredients comprising, a gas-phase thermal cracking step of gasifying the Craffinate to thermally crack at least part of the Cdiolefins which are contained in the gasified Craffinate, a desulfurization step, after the gas-phase thermal cracking step, of removing at least part of the sulfur-containing ingredients which are contained in the gasified Craffinate after the gas-phase thermal cracking step in the gas-phase state, and a hydrogen addition step, after the desulfurization step, of hydrogenating at least part of the carbon-carbon double bonds of at least one selected from diolefins and olefins which are contained in the gasified Craffinate after the desulfurization step in the gas-phase state, so as to obtain a hydrocarbon material with a total concentration of diolefins and olefins of 0.5 wt % or less is provided.

Method for producing hydrocarbon material

A polymerizable liquid crystal compound shown by the following formula (I), a polymerizable liquid crystal composition that includes the polymerizable liquid crystal compound and a chiral compound polymerizable with the polymerizable liquid crystal compound, a liquid crystalline polymer obtained by polymerizing the polymerizable liquid crystal compound or the polymerizable liquid crystal composition, and an optical anisotropic article that includes the liquid crystalline polymer. The polymerizable liquid crystal compound shows a liquid crystal phase over a wider temperature range, is chemically stable, can be inexpensively produced, and has a wide selective reflection wavelength band &#x394;&#x3bb; (i.e., a large value &#x394;n). The polymerizable liquid crystal composition includes the polymerizable liquid crystal compound, the liquid crystalline polymer is obtained by polymerizing the polymerizable liquid crystal compound or the polymerizable liquid crystal composition, and the optical anisotropic article includes the liquid crystalline polymer. wherein Yto Yrepresent &#x2014;O&#x2014;, &#x2014;O&#x2014;C(&#x2550;O)&#x2014;, &#x2014;C(&#x2550;O)&#x2014;O&#x2014;, or the like, Gand Grepresent divalent aliphatic groups having 1 to 20 carbon atoms, Zand Zrepresent an alkenyl group having 2 to 10 carbon atoms or the like, Aand Arepresent divalent organic groups A having 1 to 30 carbon atoms, Xto Xrepresent a hydrogen atom or the like, and a and b represent 0 or 1.

Growing community of inventors

Tokyo, Japan

Yoshihide Yachi