The invention relates to an extraction process for the recovery of high-boiling aldehyde products and catalysts from a hydroformylation product solution.

The invention relates to an extraction process for the recovery of high-boiling aldehyde products and catalysts from a hydroformylation product solution.

A process for producing a polycarbonate resin by reacting raw materials of a bifunctional compound and diphenyl carbonate, where the bifunctional compound is an isomer mixture of: a 2,6-derivative of a bifunctional compound of formula (3-a): ##STR00001## and a 2,7-derivative of a bifunctional compound of formula (3-b): ##STR00002## where R.sub.2 in formulae (3-a) and (3-b) is, independently, H, CH.sub.3 or C.sub.2H.sub.5, and where the mixing ratio between the 2,6-derivative and the 2,7-derivative is 30:70 to 70:30.

A process for producing a polycarbonate resin by reacting raw materials of a bifunctional compound and diphenyl carbonate, where the bifunctional compound is an isomer mixture of: a 2,6-derivative of a bifunctional compound of formula (3-a): ##STR00001## and a 2,7-derivative of a bifunctional compound of formula (3-b): ##STR00002## where R.sub.2 in formulae (3-a) and (3-b) is, independently, H, CH.sub.3 or C.sub.2H.sub.5, and where the mixing ratio between the 2,6-derivative and the 2,7-derivative is 30:70 to 70:30.

A process for producing a polycarbonate resin by reacting raw materials of a bifunctional compound and diphenyl carbonate, where the bifunctional compound is an isomer mixture of: a 2,6-derivative of a bifunctional compound of formula (3-a): ##STR00001## and a 2,7-derivative of a bifunctional compound of formula (3-b): ##STR00002## where R.sub.2 in formulae (3-a) and (3-b) is, independently, H, CH.sub.3 or C.sub.2H.sub.5, and where the mixing ratio between the 2,6-derivative and the 2,7-derivative is 30:70 to 70:30.

The present invention relates to a process for the preparation of polycyclic aliphatic dialdehydes by hydroformylation of polycyclic aliphatic diolefins in the presence of synthesis gas over an organophosphorus ligand modified metal catalyst system having a transition metal of the 8.sup.th-10.sup.th subgroup, wherein the hydroformylation is carried out by means of a water-soluble diphosphine or triarylphosphine complex catalyst at a pressure of greater than or equal to 0.5 MPa and less than or equal to 10 MPa and at a temperature of greater than or equal to 70 C. and less than or equal to 150 C. in a homogeneous liquid reaction phase, the homogeneous liquid phase comprising at least one non-aqueous solvent, diolefin and/or mono- and/or dialdehydes thereof as reaction products and an aqueous catalyst solution, the proportions of these components in the solution being controlled so as to obtain a single-phase solution under the reaction conditions.

The present invention relates to a process for the preparation of polycyclic aliphatic dialdehydes by hydroformylation of polycyclic aliphatic diolefins in the presence of synthesis gas over an organophosphorus ligand modified metal catalyst system having a transition metal of the 8.sup.th-10.sup.th subgroup, wherein the hydroformylation is carried out by means of a water-soluble diphosphine or triarylphosphine complex catalyst at a pressure of greater than or equal to 0.5 MPa and less than or equal to 10 MPa and at a temperature of greater than or equal to 70 C. and less than or equal to 150 C. in a homogeneous liquid reaction phase, the homogeneous liquid phase comprising at least one non-aqueous solvent, diolefin and/or mono- and/or dialdehydes thereof as reaction products and an aqueous catalyst solution, the proportions of these components in the solution being controlled so as to obtain a single-phase solution under the reaction conditions.

Provided are a tricyclodecane dimethanol composition which may be suitably used in preparing a polyester resin exhibiting excellent solvent resistance and chemical resistance when forming a coating film and having excellent solubility in organic solvents or water, and a preparation method thereof.

Provided are a tricyclodecane dimethanol composition which may be suitably used in preparing a polyester resin exhibiting excellent solvent resistance and chemical resistance when forming a coating film and having excellent solubility in organic solvents or water, and a preparation method thereof.

Provided are a tricyclodecane dimethanol composition, in which a ratio of structural isomers is controlled, and a preparation method thereof.