An object of the present invention is to provide a method for producing high-purity 2,6-NDA having a small alkali metal content. The present invention relates to a method for producing a high-purity 2,6-naphthalene dicarboxylic acid, comprising a purification step of washing a crude 2,6-naphthalene dicarboxylic acid having a specific surface area of 2 m.sup.2/g or more in the presence of an aqueous medium under a temperature condition of 90? C. or more and less than 200? C.

An object of the present invention is to provide a method for producing high-purity 2,6-NDA having a small alkali metal content. The present invention relates to a method for producing a high-purity 2,6-naphthalene dicarboxylic acid, comprising a purification step of washing a crude 2,6-naphthalene dicarboxylic acid having a specific surface area of 2 m.sup.2/g or more in the presence of an aqueous medium under a temperature condition of 90? C. or more and less than 200? C.

The invention relates to a process for preparing a salt from diamine and dicarboxylic acid, the process comprising contacting a diamine gas, having a gas temperature T-gas, with a dicarboxylic acid, thereby forming a reaction mixture comprising diamine/dicarboxylic acid salt, wherein the dicarboxylic acid and the reaction mixture are kept at a temperature T-mixture of at least 10 C. below the lowest of the melting temperature of the dicarboxylic acid (Tm-acid) and the melting temperature of the resulting diamine/dicarboxylic acid salt (Tm-salt). The invention also relates to a process for preparing a polyamide comprising preparing a salt from diamine and dicarboxylic acid.

The invention relates to a process for preparing a salt from diamine and dicarboxylic acid, the process comprising contacting a diamine gas, having a gas temperature T-gas, with a dicarboxylic acid, thereby forming a reaction mixture comprising diamine/dicarboxylic acid salt, wherein the dicarboxylic acid and the reaction mixture are kept at a temperature T-mixture of at least 10 C. below the lowest of the melting temperature of the dicarboxylic acid (Tm-acid) and the melting temperature of the resulting diamine/dicarboxylic acid salt (Tm-salt). The invention also relates to a process for preparing a polyamide comprising preparing a salt from diamine and dicarboxylic acid.

The present invention relates to a process for preparing a porous metal-organic framework by reacting at least one metal compound in which the metal is Be, Mg, Ca, Sr, Ba, Al, Ga or In with at least one at least bidentate organic compound and also the use of such porous metal-organic frameworks.

The present invention relates to a process for preparing a porous metal-organic framework by reacting at least one metal compound in which the metal is Be, Mg, Ca, Sr, Ba, Al, Ga or In with at least one at least bidentate organic compound and also the use of such porous metal-organic frameworks.

Provided are ion channel antagonists/blockers and uses thereof. Specifically, it provides the compounds of formula (I) or pharmaceutically acceptable salts, stereoisomers, solvates or prodrugs, preparation method therefor and application thereof. Definition of each group in the formula can be found in the specification for details. Provided is also pharmaceutical composition useful for treatment of heart disease and other ion channel related diseases. ##STR00001##

Provided are ion channel antagonists/blockers and uses thereof. Specifically, it provides the compounds of formula (I) or pharmaceutically acceptable salts, stereoisomers, solvates or prodrugs, preparation method therefor and application thereof. Definition of each group in the formula can be found in the specification for details. Provided is also pharmaceutical composition useful for treatment of heart disease and other ion channel related diseases. ##STR00001##

The present application relates to methods of hydrolyzing a polyester by contacting the polyester with a solid acid catalyst. Also disclosed are solid acid catalysts that are useful for hydrolyzing a polyester and methods of making the solid acid catalysts. Furthermore, compositions including one or both of a dicarboxylic acid and a diol, and at least one solid acid catalyst are also disclosed.

The present application relates to methods of hydrolyzing a polyester by contacting the polyester with a solid acid catalyst. Also disclosed are solid acid catalysts that are useful for hydrolyzing a polyester and methods of making the solid acid catalysts. Furthermore, compositions including one or both of a dicarboxylic acid and a diol, and at least one solid acid catalyst are also disclosed.