CO2-Enhanced Aqueous Extraction for Benign Separation of Reaction Products

CO2 强化水萃取用于反应产物的良性分离

• 批准号: 0328019
• 负责人: Charles Eckert
• 金额: $ 25.05万
• 依托单位: Georgia Tech Research Corporation
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-08-15 至 2005-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0328019&HistoricalAwards=false
• 关键词: CO2; Enhanced; Aqueous; Extraction; Benign

Eckert, Charles A., et al.GA Tech Res Corp - GIT"CO2 Enhanced Aqueous Extraction for Benign Separation of Reaction Products"Separation and product purification are crucial for environmentally benign and economically attractive chemical processes. In this project, it will be shown that the thermodynamic properties of CO2 can modify phase boundaries and distribution coefficients to provide benign and efficient separation of reaction products and recycle of homogeneous catalysts. These processes will prevent pollution both by making fewer undesirable side products as well as by reducing water and energy needed for catalyst recycle.CO2 is miscible with most organics but virtually immiscible with water; also it is a powerfulantisolvent in the organics. It has often been used in this manner for particle production or forfractional crystallization, but these applications require a saturated solution. The PIs propose to use it in conjunction with aqueous extraction to enhance recovery from more dilute organic solutions. The system proposed here can operate effectively even in dilute solutions.The PIs will show that systems containing water plus an organic where the addition of CO2 will result in significant absorption of CO2 into the organic only. This can achieve phase separation of a miscible organic/water mixture, or change drastically distribution coefficients in a two-phase organic/water system. As such this makes possible reactions between hydrophobic and hydrophilic moieties, with facile separation and purification after reaction. In addition it provide for benign recycle of catalysts which may be expensive and/or toxic.This research will show the advantages of novel solvent systems and will develop the thermodynamic data and phase equilibrium correlations needed to implement these systems.Broader Impact: The group proposing this work is a diverse joint Chemical Engineering -Chemistry team with extensive industrial partners. This format is especially advantageous forboth multidisciplinary education and for technology transfer. The results will be both theeducation of superior chemical/environmental scientists and engineers, as well as amelioration ofsubstantial pollution by current and future solvent-based processes.

埃克特，查尔斯A.，等. GATechResCorp- GIT“CO2 EnhancedAqueousExtractionforBenignSeparationofReactionProducts“分离和产物纯化对于环境友好和经济上有吸引力的化学方法是至关重要的。在这个项目中，它将表明，二氧化碳的热力学性质可以修改相边界和分配系数，以提供反应产物的良性和有效的分离和均相催化剂的再循环。这些方法将通过减少不需要的副产物以及减少催化剂分解所需的水和能量来防止污染。CO2与大多数有机物混溶，但实际上与水不混溶;它也是有机物中的强反溶剂。它通常以这种方式用于颗粒生产或分级结晶，但这些应用需要饱和溶液。PI建议将其与水提取结合使用，以提高从更稀的有机溶液中的回收率。这里提出的系统甚至可以在稀溶液中有效地运行。PI将表明，含有水和有机物的系统，其中添加CO2将导致CO2仅被有机物显著吸收。这可以实现可混溶的有机物/水混合物的相分离，或者显著改变两相有机物/水系统中的分配系数。因此，这使得疏水和亲水部分之间的反应成为可能，反应后容易分离和纯化。此外，它提供了可能是昂贵的和/或有毒的催化剂的良性循环。这项研究将显示新的溶剂系统的优势，并将开发热力学数据和相平衡相关性需要实施这些系统。更广泛的影响：提出这项工作的小组是一个多元化的联合化学工程-化学团队，拥有广泛的工业合作伙伴。这种形式对多学科教育和技术转让都特别有利。其结果将是优秀的上级化学/环境科学家和工程师的教育，以及改善目前和未来的溶剂基工艺的实质性污染。