Conversion/Recycling of Ethylene-Based Copolymers: Is it Feasible in SCF-Water Mixtures (SGER)

乙烯类共聚物的转化/回收：在 SCF-水混合物 (SGER) 中是否可行

• 批准号: 9509608
• 负责人: Mark McHugh
• 金额: $ 4.45万
• 依托单位: Johns Hopkins University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1995
• 资助国家: 美国
• 起止时间: 1995-04-01 至 1996-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9509608&HistoricalAwards=false
• 关键词: Conversion; Recycling; Ethylene; Based; Copolymers

9509608 McHugh Recycling polymers and copolymers is a technological problem that must be addressed if the amount of solid waste being landfilled in the United States is to be reduced. The challenge is to develop technology that performs the recycling in an economic manner without the concomitant generation of solvent waste that would negate any environmental benefits. Many researchers have suggested decomposing polymers into their building blocks using supercritical water. a different scenario is suggested in this program where the copolymer is converted into an alternate structure that potentially has higher commercial value than the starting material. The envisioned conversion process would use near-critical water rather than supercritical water which reduces the thermal energy requirements of the process. The differences in the solubility characteristics of the various polymers and copolymers in the near-critical solution would facilitate separating one type of copolymer from another. The successful development of this new conversion/recycling process to a great extent depends on a good understanding of these copolymers in the process solvent solution. However, the focus of this proposed study is to determine the feasibility of these ideas rather than to develop an in-depth understanding of the thermodynamics and kinetics of the process. Selected solubility and kinetics experiments will be performed to highlight the potential of this process. The successful demonstration of the concepts for this new process would create the groundwork for the development of a more detailed proposal to determine the thermodynamic, kinetic, and separations variables that would insure the economic viability of the process.

[509608]麦克休如果要减少美国的固体废物填埋量，回收聚合物和共聚物是一个必须解决的技术问题。面临的挑战是开发一种技术，以经济的方式进行回收，而不会产生溶剂废物，从而抵消任何环境效益。许多研究人员建议使用超临界水将聚合物分解成它们的组成部分。在该方案中提出了一种不同的方案，其中共聚物转化为可能具有比起始材料更高商业价值的替代结构。设想的转化过程将使用近临界水而不是超临界水，这减少了过程的热能需求。各种聚合物和共聚物在近临界溶液中溶解度特性的差异将有助于将一种共聚物与另一种共聚物分离开来。这种新的转化/回收工艺的成功开发在很大程度上取决于对这些共聚物在工艺溶剂溶液中的良好理解。然而，这项研究的重点是确定这些想法的可行性，而不是深入了解该过程的热力学和动力学。选定的溶解度和动力学实验将进行，以突出这一过程的潜力。这一新工艺概念的成功演示将为制定更详细的建议奠定基础，以确定热力学、动力学和分离变量，从而确保该工艺的经济可行性。