Scholarlink

<p>Pentamethylene-1,5-diisocyanate (PDI) is a novel raw material for producing high-performance polyurethane. The current industrial production method, the phosgene process, poses significant safety hazards and environmental pollution risks. Consequently, the non-phosgene methods for synthesizing isocyanates from amines and dimethyl carbonate have garnered attention. In this study, catalyst sodium methoxide was used for the efficient and green synthesis of pentamethylene-1,5-dicarbamate (PDC) via the methoxycarbonylation of pentane-1,5-diamine (PDA) and dimethyl carbonate (DMC). The effects of reaction conditions on the synthesis of PDC were investigated. Under conditions of a PDA:DMC molar ratio of 1:3.5, 7&#xa0;wt.% sodium methoxide catalyst (based on the mass of PDA), a reaction temperature of 70&#xa0;°C, and a reaction time of 3&#xa0;h, the conversion of PDA and yield of PDC both reached 100%. A kinetic model for the synthesis of PDC was established, yielding activation energies of 30.3&#xa0;kJ/mol and 42.2&#xa0;kJ/mol for the first and second reaction steps, respectively. The kinetic model demonstrated excellent agreement with experimental data, providing a theoretical basis for subsequent applications of PDC.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Kinetic investigation of the methoxycarbonylation reaction of pentane-1,5-diamine towards pentamethylene-1,5-dicarbamate, a novel polyurethane feedstock

  • 期刊论文

  • 发表日期：

    2026年1月6日

查看全文
  • Qing Zhang,
  • Xinyu Du,
  • Guirong Wang,
  • Yanji Wang

摘要

Pentamethylene-1,5-diisocyanate (PDI) is a novel raw material for producing high-performance polyurethane. The current industrial production method, the phosgene process, poses significant safety hazards and environmental pollution risks. Consequently, the non-phosgene methods for synthesizing isocyanates from amines and dimethyl carbonate have garnered attention. In this study, catalyst sodium methoxide was used for the efficient and green synthesis of pentamethylene-1,5-dicarbamate (PDC) via the methoxycarbonylation of pentane-1,5-diamine (PDA) and dimethyl carbonate (DMC). The effects of reaction conditions on the synthesis of PDC were investigated. Under conditions of a PDA:DMC molar ratio of 1:3.5, 7 wt.% sodium methoxide catalyst (based on the mass of PDA), a reaction temperature of 70 °C, and a reaction time of 3 h, the conversion of PDA and yield of PDC both reached 100%. A kinetic model for the synthesis of PDC was established, yielding activation energies of 30.3 kJ/mol and 42.2 kJ/mol for the first and second reaction steps, respectively. The kinetic model demonstrated excellent agreement with experimental data, providing a theoretical basis for subsequent applications of PDC.