Alkali-catalyzed methanolysis of polycarbonate. A study on recycling of bisphenol A and dimethyl carbonate

被引：119

作者：

Hu, LC

Oku, A ^{[1
]}

Yamada, E

机构：

[1] Kyoto Inst Technol, Dept Chem & Mat Technol, Sakyo Ku, Kyoto 606, Japan

[2] Kyoto Inst Technol, Ctr Environm Sci, Sakyo Ku, Kyoto 606, Japan

来源：

POLYMER | 1998年 / 39卷 / 16期

关键词：

polycarbonate; chemical recycling; methanolysis;

D O I：

10.1016/S0032-3861(97)10298-1

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Alkali-catalyzed methanolysis of poly[2,2-bis(4-hydroxyphenyl)propane carbonate] (PC) in a mixed solvent of methanol (MeOH) and toluene or dioxane was studied. Treatment of PC pellets (1.27 g) in 2 mi MeOH with a catalytic amount of NaOH (8.5 mol% per one ester unit of PC) at 60 degrees C for 330 min yielded only 7% bisphenol A (BPA). However, in a mixed solvent of MeOH (1 mi) and toluene (1 mi), the analogous treatment for 70 min completely depolymerized PC to give free bisphenol A (96%) in a solid form and dimethyl carbonate (DMC) (100%) in solution. Characteristics of the catalysis are discussed together with the pseudo-first kinetic feature of the depolymerization. Reaction conditions were investigated for the purpose of recycling PC plastics in the form of bisphenol A and DMC. (C) 1998 Elsevier Science Ltd. Ail rights reserved.

引用

页码：3841 / 3845

页数：5

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