Process for the regeneration of hydration catalyst for cyclic olefins

A method for producing a cyclic alcohol by carrying out continuous reaction of a cyclic olefin with water, which comprises the steps of:

• (1) forming a reaction mixture by mixing a water phase containing a solid acid catalyst with an oil phase containing a cyclic olefin and a cyclic alcohol in a reactor having an oil water separation function inside thereof;
• (2) drawing out the oil phase separated in the reactor continuously from the reactor;
• (3) separately from the oil phase drawing of step (2), drawing out the reaction mixture continuously from the reactor and carrying out oil water separation at a temperature of 40° C. or more;
• and
• (4) subjecting at least a portion of the solid acid catalyst in the water phase obtained by the oil water separation of step (3) to a regeneration treatment.

A method for producing a cyclic alcohol by carrying out continuous reaction of a cyclic olefin with water, which comprises the steps of:

• (1) mixing a water phase containing a solid acid catalyst with an oil phase containing a cyclic olefin and a cyclic alcohol in a reactor having an oil water separation function inside thereof;
• (2) drawing out the oil phase separated at a temperature of 40° C. or more in the reactor continuously from the reactor;
• (3) drawing out the water phase which contains oil phase components, crudely separated at a temperature of 40° C. or more in the reactor, from the reactor;
• (4) carrying out oil water separation of the oil phase component-containing water phase drawn out from the reactor in step (3), further at a temperature of 40° C. or more;
• and
• (5) subjecting at least a portion of the solid acid catalyst in the water phase obtained by the oil water separation of step (4) to a regeneration treatment.

A method for regenerating a cyclic olefin catalyst, said method comprising:

• removing, at temperature of 40° C. or more, at least a portion of a reaction mixture from a hydration reaction, said reaction mixture obtained by mixing a water phase containing a solid acid catalyst and a oil phase containing a cyclic olefin,
• separating the at least a portion of a reaction mixture into a separated oil phase and a separated water phase at a temperature of 40° C. or more, and subsequently
• subjecting at least a portion of said solid acid catalyst in said separated water phase to a regeneration treatment;
• wherein said portion of said reaction mixture is maintained at a temperature of 40° C. or more and said cyclic olefin catalyst is regenerated after effecting said hydration reaction.