Fundamental Studies of Polymerization Processes

聚合过程的基础研究

• 批准号: 8814549
• 负责人: W. Harmon Ray
• 金额: $ 28.4万
• 依托单位: University of Wisconsin-Madison
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1988
• 资助国家: 美国
• 起止时间: 1988-08-01 至 1992-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8814549&HistoricalAwards=false
• 关键词: Fundamental; Studies; Polymerization; Processes

Traditionally, manufacture of polymers was done in batch reactors with little fundamental understanding of the interaction of kinetics and transport phenomena. With the growth of demand for polymers and increased price competition, more efficient polymerization methods are being developed. Manufacturers of high volume commodity polymers now have fewer product lines and have moved to the use of continuous reactors. Producers of relatively low volume, high quality (and value) polymers are finding that their competitive edge comes from a deeper understanding of the relationship between polymerization conditions and product quality. Through his research efforts, the PI expects to design and control reactors capable of producing a more uniform and higher quality polymer. One crucial aspect of new, controllable reactor designs is the requirement for improved understanding of the dynamics of polymerization reactors. Polymerization is often characterized by large heat release, high viscosity, and difficult heat removal--all of which contribute to difficulties in controlling the dynamic behavior of the reactor. A second area of particular importance in polymerization reaction engineering is the development of continuous liquid and gas phase processes for polyolefin production (e.g., polyethylene, polypropylene, and copolymers). A third area with great potential for process improvements is in developing new processes for polymers made by polycondensation. This class of polymers encompasses many fibers and engineering plastics. In this project the PI will pursue research on these problems through both experimental and quantitative theoretical studies of continuous polymerization reactors. He plans to develop a quantitative understanding of the governing chemical and physical phenomena (i.e., through detailed mathematical models comfirmed by experimental data) and to use this new understanding (i) To devise improved reactor designs which provide better control of polymer properties and also minimize difficult dynamics. By quantitatively determining the ranges of operating conditions and system parameters for which oscillations and stability problems arise, he expects to provide design procedures which satisfy the polymer product specifications and have good economics but which avoid those parameter combinations leading to difficult dynamic behavior. (ii) To develop new types of on-line sensors for the reactor and polymer particles which allow closer quality control of the product and to combine these new on-line polymer property sensors with feedback strategies to provide control schemes which lead to safe dynamic operation and close control of product quality. (iii) To devise new reactor designs for existing and emerging classes of polymer products. * * * //

传统上，聚合物的制造是在间歇式反应器中完成的，对动力学和传输现象的相互作用知之甚少。 随着聚合物需求的增长和价格竞争的加剧，人们正在开发更有效的聚合方法。 大批量商品聚合物的制造商现在的产品线较少，并已转向使用连续反应器。 产量相对较低、高质量（和价值）聚合物的生产商发现，他们的竞争优势来自于对聚合条件和产品质量之间关系的更深入了解。 通过他的研究工作，PI 期望设计和控制能够生产更均匀和更高质量聚合物的反应器。 新型可控反应器设计的一个关键方面是需要更好地了解聚合反应器的动力学。 聚合反应通常具有放热量大、粘度高和排热困难的特点，所有这些都导致反应器动态行为的控制变得困难。 聚合反应工程中特别重要的第二个领域是开发用于聚烯烃（例如聚乙烯、聚丙烯和共聚物）生产的连续液相和气相工艺。 第三个具有巨大工艺改进潜力的领域是开发缩聚聚合物的新工艺。 这类聚合物包括许多纤维和工程塑料。 在该项目中，PI 将通过连续聚合反应器的实验和定量理论研究来研究这些问题。 他计划对主导的化学和物理现象进行定量理解（即通过实验数据证实的详细数学模型），并利用这种新的理解（i）设计改进的反应器设计，以更好地控制聚合物性能，并最大限度地减少困难的动力学。 通过定量确定出现振荡和稳定性问题的操作条件和系统参数的范围，他期望提供满足聚合物产品规格并具有良好经济性的设计程序，但避免那​​些导致困难的动态行为的参数组合。 (ii) 开发用于反应器和聚合物颗粒的新型在线传感器，以便对产品进行更严格的质量控制，并将这些新型在线聚合物特性传感器与反馈策略相结合，以提供控制方案，从而实现安全动态操作和产品质量的严密控制。 (iii) 为现有和新兴类别的聚合物产品设计新的反应器设计。 * * * //