Provided is a preparation method for a cyclohexane dimethanol (CHDM), which can have a high trans content through particular conditions, additive addition, or reactant addition, which is controlled in a cyclohexane dicarboxylic acid (CHDA) hydrogenation reaction, and a cyclohexane dimethanol prepared thereby.

Provided is a preparation method for a cyclohexane dimethanol (CHDM), which can have a high trans content through particular conditions, additive addition, or reactant addition, which is controlled in a cyclohexane dicarboxylic acid (CHDA) hydrogenation reaction, and a cyclohexane dimethanol prepared thereby.

Process for preparing the dialdehyde of vinylcyclohexene

A method for preparing 1,4-cyclohexanedimethanol is provided. The method allows hydrogen gas fed into a reaction tank to be uniformly dispersed in a reaction solution by a gas-introducing mixer having air-extracting, air-exhausting and mixing functions. Accordingly, the reaction solution has a high concentration of dissolved hydrogen gas so that the reaction time of hydrogenation can be reduced to as short as possible. Furthermore, the method uses a hydrogenation catalyst having many advantages such as high activity and low cost. The added amount of the hydrogenation catalyst can be reduced under the operation of the gas-introducing mixer.

A method for preparing 1,4-cyclohexanedimethanol is provided. The method allows hydrogen gas fed into a reaction tank to be uniformly dispersed in a reaction solution by a gas-introducing mixer having air-extracting, air-exhausting and mixing functions. Accordingly, the reaction solution has a high concentration of dissolved hydrogen gas so that the reaction time of hydrogenation can be reduced to as short as possible. Furthermore, the method uses a hydrogenation catalyst having many advantages such as high activity and low cost. The added amount of the hydrogenation catalyst can be reduced under the operation of the gas-introducing mixer.

The present invention relates to a method for preparing high-purity 1,3-cyclohexanedimethanol capable of achieving a high conversion rate by allowing most of the reactant to participate in the reaction, and of increasing reaction efficiency and economic efficiency by further simplifying the reaction process, while minimizing by-products within a shorter period of time. Specifically, the method for preparing 1,3-cyclohexanedimethanol includes reducing 1,3-cyclohexanedicarboxylic acid in the presence of a metal catalyst, which is fixed to a silica support and includes a ruthenium (Ru) compound, a tin (Sn) compound and a platinum (Pt) compound in a weight ratio of 1:0.8 to 1.2:1.2 to 2.4.

The present invention relates to a method for preparing high-purity 1,3-cyclohexanedimethanol capable of achieving a high conversion rate by allowing most of the reactant to participate in the reaction, and of increasing reaction efficiency and economic efficiency by further simplifying the reaction process, while minimizing by-products within a shorter period of time. Specifically, the method for preparing 1,3-cyclohexanedimethanol includes reducing 1,3-cyclohexanedicarboxylic acid in the presence of a metal catalyst, which is fixed to a silica support and includes a ruthenium (Ru) compound, a tin (Sn) compound and a platinum (Pt) compound in a weight ratio of 1:0.8 to 1.2:1.2 to 2.4.

The present disclosure relates to a 1,4-cyclohexanedimethanol (CHDM) composition and a purification method of the same. More specifically, it relates to a 1,4-cyclohexanedimethanol composition having a high purity due to a low by-product content and a high trans isomer ratio, and a method for purifying the same.

The present disclosure relates to a 1,4-cyclohexanedimethanol (CHDM) composition and a purification method of the same. More specifically, it relates to a 1,4-cyclohexanedimethanol composition having a high purity due to a low by-product content and a high trans isomer ratio, and a method for purifying the same.

Provided are a noble metal-transition metal complex catalyst supported on a carbon-coated silica-alumina support and a preparation method therefor, the catalyst being capable of obtaining a fast reaction rate and catalyst stability, as compared to a conventional catalyst, when cyclohexane dimethanol (CHDM) production is carried out by a cyclohexane dicarboxylic acid (CHDA) hydrogenation reaction in an aqueous solution by using a carbon-coated supported catalyst.