Process for producing cycloolefins
AssigneeAsahi Kasei Kogyo Kabushiki Kaisha
InventorsHajime Nagahara, Mitsuo Konishi
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Abstract
A process for producing a cycloolefin in high selectivity and yield by partial hydrogenation of a monocyclic armoatic hydrocarbon with hydrogen is disclosed. In this process, the hydrogenation reaction is carried out under a neutral or acidic condition in the presence of: (i) a particulate hydrogenating catalyst mainly comprising metallic ruthenium having an average crystallite size of 200 .ANG. or less, (ii) at least one zinc compound as a promoter, (iii) at least one additive selected from the group consisting of oxides, hydroxides and hydrates thereof Zr, Hf, Ti, Nb, Ta, Cr, Fe, Co, Al, Ga and Si, and (iv) water.
Claims37
A process for producing a cycloolefin which comprises partially hydrogenating a monocyclic aromatic hydrocarbon with hydrogen under neutral or acidic conditions in the presence of:
- (i) water,
- (ii) a particulate hydrogenating catalyst comprising at least 60% by weight metallic ruthenium having an average crystallite size of 200 .ANG. or less, said catalyst being dispersed in an aqueous phase,
- (iii) at least one zinc salt as a promotor, and
- (iv) at least one additive particle selected from the group consisting of oxides, hydroxides and hydrates of Zr, Hf, Ti, Nb, Ta, Cr, Fe, Co, Al, Ga, and Si;
- and wherein said additive particle is not a support for said catalyst.
A process according to claim 24, wherein the additive has an average particle size of 0.005-10 82 m.
A process according to claim 31, wherein the pH value ranges from 2 to 6.5.
Dependencies are inferred from the claim text.