解聚
甲醇
超临界流体
化学
产量(工程)
催化作用
碳酸二甲酯
聚碳酸酯
溶剂
试剂
选择性
有机化学
核化学
化学工程
材料科学
工程类
冶金
作者
R.B. Pinero,Juan Rafael García,Marı́a José Cocero
出处
期刊:Green Chemistry
[The Royal Society of Chemistry]
日期:2005-01-01
卷期号:7 (5): 380-380
被引量:101
摘要
Alkali-catalysed depolymerization of polycarbonate (PC) wastes by alcoholysis in supercritical or near critical conditions has been studied in order to recover the essential monomer bisphenol A (BPA) and dimethyl carbonate (DMC) as a valuable by-product. This work aims to study the continuous process and possible scale-up for decomposition of both commercial PC and PC plastic wastes using methanol as solvent/reagent and NaOH as alkali catalyst. Total depolymerization of PC has been achieved working at a temperature range of 75–180 °C and pressures from 2 to 25 MPa. The influence of operation conditions on product yield, selectivity and reaction rate has been studied, including temperature, pressure, methanol/cosolvent ratio and catalyst concentration. BPA yields of 80–90% (kg product/kg PC) were achieved with a further crystallization and separation of the final product, resulting in BPA pure crystals (99.9%). DMC yield reached 35% (kg DMC/kg PC) and was proved to be strongly dependent on pressure and methanol/H2O ratio. Non desired by-product yield was negligible when pure methanol was used as solvent and selectivity decreased with increasing methanol/H2O ratio.
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