Production method of dicarboxylic acid compounds and/or diamine compounds using polyamide as a raw material

A production method of a dicarboxylic acid compound (2) represented by the following general formula (2) and/or a diamine compound (3) represented by the following general formula (3), and optionally, a salt compound (4) represented by the following general formula (4), a polyamide (5) represented by the following general formula (5), and/or a polyamide (6) represented by the following general formula (6), from a polyamide (1) represented by the following general formula (1), the method comprising:

• (i) a first hydrolysis step of hydrolyzing the polyamide (1) in high-temperature water to obtain a first hydrolysate;
• and
• (ii) a second hydrolysis step of subjecting the first hydrolysate to an enzymatic hydrolysis to obtain a second hydrolysate,
• wherein the first hydrolysate contains a water-soluble polyamide that dissolves in water at 20° C., and
• the second hydrolysate contains the dicarboxylic acid compound (2) and/or the diamine compound (3) and, optionally, the salt compound (4), the polyamide (5), and/or the polyamide (6):
• in the formula,
• R1 is a substituted or unsubstituted aliphatic or aromatic hydrocarbon group having 1 to 10 carbons, and
• R2 is a substituted or unsubstituted aliphatic hydrocarbon group having 2 to 10 carbons,
• in the formula, R1 is as defined in the general formula (1),
• in the formula, R2 is as defined in the general formula (1),
• in the formula, R1 and R2 are as defined in the general formula (1),
• in the formula, R1 and R2 are as defined in the general formula (1),
• in the formula, R1 and R2 are as defined in the general formula (1).