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2. 发明授权

US5151474A Process control method for manufacturing polyolefin 失效
标题翻译：制造聚烯烃的工艺控制方法
公开(公告)号：US5151474A
公开(公告)日：1992-09-29
申请号：US481020
申请日：1990-02-16
申请人： Sandra V. Lange , David P. Denton , Joseph P. Weller , Jean P. Chauvel, Jr. , Stuart Farquharson , Harry D. Ruhl, Jr. , Gregory A. Winter
发明人： Sandra V. Lange , David P. Denton , Joseph P. Weller , Jean P. Chauvel, Jr. , Stuart Farquharson , Harry D. Ruhl, Jr. , Gregory A. Winter
IPC分类号： B01J19/00 , C08F2/06 , C08F10/00
CPC分类号： B01J19/0006 , C08F10/00 , C08F2400/02
摘要： A process control method for controlling a polyolefin polymerization process, such as a solution polyethylene process, which includes five steps. The first step is to flow a stream of a solvent into a polyolefin reactor, such as flowing a stream of heptane solvent into the reactor at essentially a constant rate. The second step is to add a principal monomer to the stream of solvent, such as by adding ethylene at a controllable rate to the stream of solvent. The third step is to add a co-monomer to the stream of solvent, such as by adding 1-octene at a controllable rate to the stream of solvent. The fourth step is to determine the concentration of the principal monomer and the concentration of the co-monomer in the stream of solvent by high resolution multi-wavelength vibrational spectroscopy analysis, such as by Fourier transform infrared spectroscopy system having a spectral resolution of 4 wavenumbers which analyzes at 1909 wavenumbers for ethylene, at 1829 wavenumbers for 1-octene and at 2120 wavenumbers for a reference signal. The fifth step is to control the rate of addition of the principal monomer, the rate of addition of the comonomer or preferably the rate of addition of both the principal monomer and the co-monomer according to the determination of the fourth step to obtain the desired concentration of ethylene and 1-octene in the solvent so that, for example, the density of the polyolefin product can be controlled.
摘要翻译：用于控制聚烯烃聚合方法的过程控制方法，例如溶液聚乙烯方法，其包括五个步骤。第一步是将溶剂流流入聚烯烃反应器中，例如以基本恒定的速率将庚烷溶剂流输入反应器。第二步是将主要单体加入到溶剂流中，例如通过以可控速率向溶剂流中加入乙烯。第三步是向溶剂流中加入共聚单体，例如通过以可控的速率向溶剂流中加入1-辛烯。第四步是通过高分辨率多波长振动光谱分析来确定主要单体的浓度和溶剂流中共聚单体的浓度，例如通过具有4个波数的光谱分辨率的傅里叶变换红外光谱系统其分析了1909年的乙烯波数，1829波数的1-辛烯和2120波数的参考信号。第五步是根据第四步的测定来控制主要单体的加入速率，共聚单体的加入速率或优选加入主单体和共聚单体的速率以获得所需的乙烯和1-辛烯在溶剂中的浓度使得例如可以控制聚烯烃产品的密度。

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