The isocyanate-derived fraction resulting as the bottom phase from the split-phase glycolysis of conventional polyurethane flexible foams has been given a new life based on the formation of amine-based polymers (polyureas and polyamides). For that purpose, the bottom phase was first hydrolyzed, producing toluenediamine and diethylene glycol, and further subjected to controlled vacuum distillation in order to recover both products separately. The hydrolysis reaction and the separation process conditions were determined and optimized, obtaining products with a purity comparable to that of commercial ones. Then, the recovered diethylene glycol was used in a new glycolysis process, obtaining a split-phase product with properties similar to those obtained using commercial diethylene glycol. Finally, the recovered toluenediamine was used in the synthesis of polyureas and polyamides. Both syntheses were modified with respect to the state of the art, replacing benzene with limonene in the synthesis of polyamides, which implies environmental improvements.

中文翻译：

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通过合成聚脲和聚酰胺对聚氨酯糖酵解中异氰酸酯衍生的馏分进行增值


传统聚氨酯软质泡沫的分相糖酵解产生的异氰酸酯衍生馏分作为底相，基于胺基聚合物（聚脲和聚酰胺）的形成而被赋予了新的生命。为此，首先对底相进行水解，生成甲苯二胺和二甘醇，然后进一步进行受控减压蒸馏，以便分别回收这两种产品。确定并优化水解反应和分离工艺条件，获得纯度与商业产品相当的产品。然后，将回收的二甘醇用于新的糖酵解工艺，获得具有与使用商业二甘醇相似特性的分相产物。最后，回收的甲苯二胺用于合成聚脲和聚酰胺。两种合成物都根据现有技术进行了修改，在聚酰胺的合成中用柠檬烯代替苯，这意味着环境得到改善。