A method for preparing aniline monomer by double enzyme synergistic decomposition of polyurethane bonds

Through the method of synergistically depolyurethane bonds of dual enzymes, the problem of low efficiency in the recovery of aniline monomers by enzymatic method is solved, and efficient and environmentally friendly PU material recycling is achieved, reducing energy consumption and environmental pollution.

CN118792365BActive Publication Date: 2025-02-11NANJING TECH UNIV
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Patent Information

Application Number
CN202411283893.5
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-09-13
Publication Date
2025-02-11
Estimated Expiration
2044-09-13

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Abstract

The present invention belongs to the field of biochemistry, and specifically relates to a method for preparing aniline monomers by depolymerizing carbamate bonds with two enzymes. The method specifically uses carbamate compounds as substrates, and obtains aniline monomers by adding amidase SP1 and esterase Aes72 for depolymerization reaction. The amidase SP1 and esterase Aes72 described in the present invention both act on carbamate bonds, but have positional hydrolysis preferences for TDI-based carbamate bonds. The two enzymes can achieve complementary preferential effects to achieve complete depolymerization of carbamates, and SP1 has high MDI-based carbamate hydrolysis activity. The present invention utilizes two enzymes to degrade carbamate compounds, greatly improving the enzymatic hydrolysis efficiency, and the aniline monomers generated after depolymerization can be subjected to phosgenation reaction to re-prepare isocyanates, thereby realizing the recycling of polyurethane aniline monomers.
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Citation Information

Patent Citations

  • Novel urethanases for the enzymatic degradation of polyurethanes

    US20210269834A1