Extraction method of 1, 5-pentanediamine, obtained 1, 5-pentanediamine product and polyamide

The invention provides an extraction method of 1, 5-pentamethylene diamine, a 1, 5-pentamethylene diamine product and polyamide, the method comprises the following steps: (1) providing a mixture, the mixture comprising a first solution and an aldehyde ketone compound, the first solution comprising 1, 5-pentamethylene diamine carbonate and water; (2) placing the mixture at 25-85 DEG C, and carrying out a decomposition reaction of 1, 5-pentamethylene diamine carbonate; (3) adding an alkaline substance, reacting residual 1, 5-pentamethylene diamine ions in the system after the decomposition reaction to generate 1, 5-pentamethylene diamine, reacting 1, 5-pentamethylene diamine with the aldehyde ketone compound to generate imine, forming a water phase and an organic phase containing the imine in the system, and separating the water phase from the organic phase; and (4) under an acidic condition, carrying out a hydrolysis reaction on the imine to obtain an aqueous solution containing 1, 5-pentamethylene diamine sal