Catalytic hydrothermal depolymerization of nylon 6 |
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Authors: | Jinyang Chen Zhi Li Lujiang Jin Pei Ni Guiyang Liu Haibo He Jianqiu Zhang Junping Dong Ruyi Ruan |
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Institution: | (1) Department of Applied Chemistry and Biochemistry, Kumamoto University, Kumamoto 865-8555, Japan;(2) Hitachi Chemical Co., Ltd, Shinjuku-ku, Japan; |
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Abstract: | Depolymerization of nylon 6 to produce ε-caprolactam using an environmentally friendly heteropoly acid catalyst was studied
at temperatures between 553 and 603 K in water. The products of depolymerization were analyzed qualitatively and quantitatively
by means of mass spectrometry and high-performance liquid chromatography. The results showed that the depolymerized product
was mainly ε-caprolactam with a little 6-aminocaproic acid and oligomers. The phosphotungstic heteropoly acid used as a catalyst
can improve the hydrolysis rate and yield of ε-caprolactam. The optimum hydrolysis conditions for ε-caprolactam yield were
as follows: phosphotungstic heteropoly acid content, 3%; reaction temperature, 573 K; and reaction time, 85 min. Under these
conditions, the yield of ε-caprolactam was 77.96%. In the temperature range 553–603 K, the activation energy of 3% phosphotungstic
heteropoly acid-catalyzed depolymerization was evaluated as 77.38 kJ/mol, which is lower than the 86.64 kJ/mol value for no
catalyst. |
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