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Study on the Monomer Recycling of Plastic Wastes to Feedstock Chemicals.

塑料废物单体回收制原料化学品的研究。

基本信息

批准号：
17560727
负责人：
OKU Akira
金额：
$ 2.11万
依托单位：
Research Institute for Production Development
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2006
项目状态：
已结题

项目摘要

The aim of the present study was the chemical recycling of conventional plastic wastes to the feedstock monomers in accordance to our basic concept "Complete Chemical Recycling of All Plastic Portions" (C_2RAP_2) without loosing any chemical component. The target plastic was poly(carbonate) (PC) which, by means of solvolytic depolymerization in carbohydrate polyols, was recycled to bisphenol A (BPA) and cyclic carbonates of carbohydrates. Both the products are the monomers of PC and, thus, the complete reclamation of PC to the virgin PC resin can be realized.First, in advance to the use of PC, diphenyl carbonate (DPC) was used as the model of PC to optimize the conditions in the treatment with glycerol (GLY), i.e., the smallest carbohydrate polyol. Indeed, the base-catalyzed treatment of DPC with GLY produced hydroxymethyldioxorane (HMDO) and phenol almost quantitatively. The same conditions were adopted in the treatment of PC with GLY and, again, BPA and HMDO were quantitatively produced.Second, glucose (GLU) was used instead of GLY. The treatment of DPC with GLU was carried out in aqueous solvent of DMF. Phenol and dicarbonate of GLU (GLU-DC) were the major products obtained in the yields of 40-55%. Then, PC was analogously treated with GLU to produce BPA and dicarbonate GLU-DC. The chemical structure of GLU-DC was elucidated spectroscopically to be 1,2;4,6-dicyclic carbonate of GLU leaving the OH group at 3-position intact.To summarize, PC was depolymerized by the solvolytic action of both GLY and GLU to produce BPA and corresponding cyclic carbonate of carbohydrates. The cyclic carbonates are the reservoir of one carbon unit, i.e., CO, and they can be reused for the reproduction of virgin PC.

本研究的目的是在不损失任何化学成分的情况下，按照我们的基本概念“所有塑料部分的完全化学回收”(C_2RAP_2)，将传统塑料废料化学回收到原料单体中。目标塑料是聚碳酸酯(PC)，通过在碳水化合物多元醇中的溶解解聚，回收生成双酚A(BPA)和碳水化合物的环状碳酸盐。首先，在PC使用之前，以碳酸二苯酯(DPC)作为PC的模型，优化甘油(GLY)处理的条件，即最小的碳水化合物多元醇。事实上，碱催化GLY处理DPC几乎定量地产生了羟甲基二氧六环(HMDO)和苯酚。在相同的条件下，用GLY处理PC，再次定量产生BPA和HMDO。第二，用葡萄糖代替GLY。在DMF水溶液中，用GLU对DPC进行处理。主要产物为苯酚和GLU-DC(GLU-DC)，产率为40-55%。然后，将PC类似于GLU处理，生成双酚A和重碳酸盐GLU-DC。GLU-DC的化学结构经波谱分析确定为GLU的1，2；4，6-二环碳酸酯，羟基位于3-位。综上所述，PC是通过GLY和GLU的溶解作用解聚生成双酚A和相应的碳水化合物的环状碳酸酯。环状碳酸盐是一个碳单元，即CO的储存库，它们可以重复用于原始PC的复制。