A process for making a high purity salt comprises the steps of providing an organic compound, providing a metal salt, adding the metal salt and organic compound to an aqueous medium, heating the reaction mixture to react the organic compound and the metal salt to form an organic salt, collecting the organic salt, exposing the collected organic salt to microwave radiation, and exposing the collected organic salt to infrared radiation.

A process for making a high purity salt comprises the steps of providing an organic compound, providing a metal salt, adding the metal salt and organic compound to an aqueous medium, heating the reaction mixture to react the organic compound and the metal salt to form an organic salt, collecting the organic salt, exposing the collected organic salt to microwave radiation, and exposing the collected organic salt to infrared radiation.

A process for making a high purity salt comprises the steps of providing an organic compound, providing a metal salt, adding the metal salt and organic compound to an aqueous medium, heating the reaction mixture to react the organic compound and the metal salt to form an organic salt, collecting the organic salt, exposing the collected organic salt to microwave radiation, and exposing the collected organic salt to infrared radiation.

An object of the present invention is to provide a powder of high-purity 1,4-cyclohexanedicarboxylic acid with excellent powder flowability. The invention provides a powder of high-purity 1,4-cyclohexanedicarboxylic acid having particle size distributions (volume basis) such that D.sub.10 is within a range of 5 to 55 m, D.sub.50 is within a range of 40 to 200 m, and D.sub.90 is within a range of 170 to 800 m; and having an aerated bulk density of 0.4 to 0.8 g/cm.sup.3, a packed bulk density of 0.5 to 1.0 g/cm.sup.3, and a compressibility of 10 to 23%.

An object of the present invention is to provide a powder of high-purity 1,4-cyclohexanedicarboxylic acid with excellent powder flowability. The invention provides a powder of high-purity 1,4-cyclohexanedicarboxylic acid having particle size distributions (volume basis) such that D.sub.10 is within a range of 5 to 55 m, D.sub.50 is within a range of 40 to 200 m, and D.sub.90 is within a range of 170 to 800 m; and having an aerated bulk density of 0.4 to 0.8 g/cm.sup.3, a packed bulk density of 0.5 to 1.0 g/cm.sup.3, and a compressibility of 10 to 23%.

An object of the present invention is to provide a powder of high-purity 1,4-cyclohexanedicarboxylic acid with excellent powder flowability. The invention provides a powder of high-purity 1,4-cyclohexanedicarboxylic acid having particle size distributions (volume basis) such that D.sub.10 is within a range of 5 to 55 m, D.sub.50 is within a range of 40 to 200 m, and D.sub.90 is within a range of 170 to 800 m; and having an aerated bulk density of 0.4 to 0.8 g/cm.sup.3, a packed bulk density of 0.5 to 1.0 g/cm.sup.3, and a compressibility of 10 to 23%.

The present invention relates to a method for preparing 1,3-cyclohexanedicarboxylic acid capable of exhibiting excellent activity, of enhancing the reaction efficiency and economic efficiency by using a catalyst having improved durability under the reaction conditions of high temperature and strong acid, of achieving excellent conversion rates by allowing most of reactants to participate in the reaction, and of obtaining products having high purity while minimizing by-products within a shorter period of time. The method for preparing 1,3-cyclohexanedicarboxylic acid may include: reducing isophthalic acid in the presence of a metal catalyst fixed to a silica support and containing a palladium (Pd) compound and a copper (Cu) compound in a weight ratio of 1:0.1 to 0.5.

The present invention relates to a method for preparing 1,3-cyclohexanedicarboxylic acid capable of exhibiting excellent activity, of enhancing the reaction efficiency and economic efficiency by using a catalyst having improved durability under the reaction conditions of high temperature and strong acid, of achieving excellent conversion rates by allowing most of reactants to participate in the reaction, and of obtaining products having high purity while minimizing by-products within a shorter period of time. The method for preparing 1,3-cyclohexanedicarboxylic acid may include: reducing isophthalic acid in the presence of a metal catalyst fixed to a silica support and containing a palladium (Pd) compound and a copper (Cu) compound in a weight ratio of 1:0.1 to 0.5.

Provided herein are methods of producing acrylic acid from bPL. Such methods involve the use of a heterogeneous catalyst, such as a zeolite at vapor phase conditions. The method may use a fixed bed, moving bed or fluidized contacting zone as the reactor configurations.

Provided is a method of producing an acid halide solution that is useful in production of a polymerizable liquid-crystal compound. The method of producing an acid halide solution includes: a first step of reacting a specific dicarboxylic acid compound with a halogenating agent in a water-immiscible organic solvent in the presence of at least 1.1 equivalents and not more than 3.0 equivalents of an activator relative to the dicarboxylic acid compound to obtain a reaction liquid including a solution that contains an acid halide compound and an oily liquid that is immiscible with the solution containing the acid halide compound; and a second step of removing the oily liquid from the reaction liquid obtained in the first step to obtain a purified liquid containing the acid halide compound.