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    • 4. 发明申请
    • PROCESS FOR MONITORING THE POLYMERIZATION OF ETHYLENE OR ETHYLENE AND COMONOMERS IN A TUBULAR-REACTOR AT HIGH-PRESSURES
    • 用于监测高压管状反应器中乙烯或乙烯和共聚物聚合的方法
    • US20130274424A1
    • 2013-10-17
    • US13995829
    • 2011-12-19
    • Sebastian WeiandWolfgang GsellaVictor KuhneChristian-Ulrich SchmidtTom Zimmermann
    • Sebastian WeiandWolfgang GsellaVictor KuhneChristian-Ulrich SchmidtTom Zimmermann
    • C08F10/02G01N7/00
    • C08F10/02C08F110/02C08F210/02C08F210/16C08F2400/02G01N7/00C08F210/06C08F220/14C08F2/00C08F2/001
    • Process for monitoring the polymerization of ethylene or ethylene and comonomers in the presence of free-radical polymerization initiator at pressures in the range of from 160 MPa to 350 MPa and temperatures in the range of from 100° C. to 350° C. in a tubular reactor with one or more reaction zones, which is equipped with cooling jackets for cooling the tubular reactor with a cooling medium, comprising the steps of a) measuring as process parameters the temperature profile and the pressure of the reaction medium and the flow and temperature profile of the cooling medium along the reactor, b) monitoring the feeds of ethylene, if present comonomer, free-radical polymerization initiator and chain-transfer agent to all reaction zones, c) calculating, based on the measured process parameters and on a model for the polymerization process, concentrations for free-radical polymerization initiator, chain-transfer agent, ethylene and, if present, comonomers at at least so many positions along the reactor, that at least one calculation is carried out all 10 s for a volume unit flowing through the reactor, d) calculating, based on the measured process parameters and the calculated concentrations, the cooling power, the generation of heat, and the concentration of radicals, e) calculating, based on the calculated data of the cooling power, of the generation of heat, and of the concentration of radicals, the potential of a thermal runaway of the reaction mixture at the positions along the reactor which have the highest temperatures, and f) outputting an alarm signal if the calculated value for the potential of a thermal runaway exceeds a predefined value and process for polymerizing ethylene or ethylene and comonomers comprising such a monitoring process.
    • 在自由基聚合引发剂的存在下,在160MPa至350MPa的压力和100℃至350℃的温度范围内,监测乙烯或乙烯和共聚单体的聚合反应的方法, 具有一个或多个反应区的管式反应器,其配备有用于用冷却介质冷却管式反应器的冷却夹套,包括以下步骤:a)测量作为工艺参数的温度分布和反应介质的压力以及流动和温度 b)监测乙烯(如果存在的共聚单体,自由基聚合引发剂和链转移剂)进料到所有反应区的进料,c)根据测量的工艺参数和模型计算 对于聚合过程,自由基聚合引发剂,链转移剂,乙烯和(如果存在)共聚单体在至少这么多位置的浓度 反应器,对于流过反应堆的体积单位进行至少一次计算10秒,d)基于测量的过程参数和计算的浓度,计算冷却功率,产生热量和浓度 的自由基,e)基于计算的冷却功率的数据,计算出热的产生和自由基的浓度,反应混合物在沿着反应器的位置处的热失控的可能性为最高 温度,以及f)如果热失控潜力的计算值超过预定值,则输出报警信号,并且包括这样的监测过程的聚合乙烯或乙烯和共聚单体的方法。
    • 5. 发明申请
    • Process for the preparation of ethylene homopolymers or copolymers in a high-pressure reactor controlled by a model based predictive controller
    • US20120322956A1
    • 2012-12-20
    • US13516703
    • 2010-12-20
    • Christian-Ulrich SchmidtKlaus BerhalterSteve MakinKevin Taylor
    • Christian-Ulrich SchmidtKlaus BerhalterSteve MakinKevin Taylor
    • C08F10/02C08F2/01
    • C08F110/02C08F2400/02C08F2/00C08F2500/12
    • Process for the preparation of ethylene homopolymers or copolymers in the presence of free-radical polymerization initiator at from 100° C. to 350° C. and pressures in the range of from 160 MPa to 350 MPa in a high-pressure polymerization unit comprising a high-pressure reactor with one or more reaction zones, to each of which free-radical polymerization initiator is fed, which is controlled by a model based predictive controller carrying out the steps a) feeding target values for density and melt flow rate (MFR) of the ethylene homopolymer to be prepared as setpoint ranges to the controller if an ethylene homopolymers is prepared or feeding target values for density, MFR and copolymer composition of the ethylene copolymer of to be prepared as set-point ranges to the controller if an ethylene copolymer is prepared; b) measuring data in the high-pressure polymerization unit and calculating by means of a model based on these data a value for the density of the ethylene homopolymer or copolymer currently prepared in the high-pressure reactor; c) independently of step b), measuring data in the high-pressure polymerization unit and calculating by means of a model based on these data a value for the MFR of the ethylene homopolymer or copolymer currently prepared in the high-pressure reactor; d) if an ethylene copolymer is prepared, independently of steps b) and c), measuring data in the high-pressure polymerization unit and calculating by means of a model based on these data a value for the copolymer composition of the ethylene copolymer currently prepared in the high-pressure reactor, e) feeding the calculated values for the density, for the MFR and, if an ethylene copolymer is prepared, for the copolymer composition as controlled variables to the controller; and f) measuring data in the high-pressure polymerization unit and calculating by means of the controller based on these measured data, the setpoint ranges fed in step a) and the values calculated in steps b), c) and d) as outputs setpoint ranges for manipulated variables of the high-pressure polymerization unit including setpoint ranges for feeding the free-radical polymerization initiator, wherein the calculation of the setpoint ranges for feeding the free-radical polymerization initiator is repeated at least every 3 minutes, method of controlling a process for the preparation of ethylene homopolymers or copolymers in a high-pressure reactor and method for transitioning from one grade to another in a process for the preparation of ethylene homopolymers or copolymers in a high-pressure reactor.
    • 9. 发明申请
    • Regulation of the continuous ethylene polymerization process in a high-pressure reactor
    • 在高压反应器中连续乙烯聚合过程的调节
    • US20060167193A1
    • 2006-07-27
    • US10547651
    • 2004-03-03
    • Frank-Olaf MahlingChristian-Ulrich SchmidtAngelika Altmann-DiesesAndreas Daiss
    • Frank-Olaf MahlingChristian-Ulrich SchmidtAngelika Altmann-DiesesAndreas Daiss
    • C08F2/00
    • C08F10/02C08F110/02C08F4/34C08F2/00C08F2/001C08F2500/08C08F2500/12C08F2500/26
    • Method of regulating the process for the continuous free-radical polymerization of ethylene in the presence or absence of comonomers in a tube reactor having at least one reaction zone (1, 2, 3, 4) at pressures above 1000 bar and temperatures in the range from 100 to 400° C., wherein a mixture of at least two polymerization initiators which have different reaction characteristics and provision costs, in particular purchase prices, is metered continuously into the tube reactor at the beginning of each reaction zone (1, 3, 3, 4), at least one physical parameter which as an influence on the polymerization initiator mixture to be used is measured at prescribed intervals in each reaction zone (, 2, 3, 4), the mixture of polymerization initiators which under the prevailing conditions of the physical parameter or parameters measured results in the minimum initiator costs for producing a prescribed amount of polymer product having prescribed product properties and ensures sage operation of the tube reactor is calculated in an optimizer for each reaction zone (1, 2, 3, 4) and, finally, the calculated amount and composition of the polymerization initiators is used as the basis for the further metered additions.
    • 在具有在1000巴以上的压力下具有至少一个反应区(1,2,3,4)的管式反应器中,在存在或不存在共聚单体的条件下,调节乙烯的连续自由基聚合的方法和温度范围 100至400℃,其中在每个反应区(1,3,...)的开始处将具有不同反应特性和提供成本,特别是购买价格的至少两种聚合引发剂的混合物连续地计量加入到管式反应器中, 3,4)中,在各反应区(2,3,4)中以规定的间隔测定作为对所使用的聚合引发剂混合物的影响的至少一种物理参数,在主要条件下的聚合引发剂混合物 的物理参数或参数测量结果是产生规定量的具有规定产品特性的聚合物产品的最小引发剂成本,并确保鼠尾草操作 在每个反应区(1,2,3,4)的优化器中计算管式反应器,最后,将聚合引发剂的计算量和组成用作进一步计量添加的基础。