SU724525A2 - Method of molecular mass polybutodiene distribution control - Google Patents

Description

one

This invention relates to the automation of polymerization processes.

According to the main author. St. N 536195, a method for regulating mass-distribution molecules of tulibutadiene is carried out by stabilizing an intermediate parameter of the process, for example, the viscosity of a polymerizate in reactors, affecting the flow rate of an aluminum KONmoHeirra catalyst, measuring the molecular weight distribution of a polymer at a battery outlet and changing it when for these values of molecular weight and weight) the content of high molecular weight fractions of the polymer, the intermediate parameter value: the process and costs of the titanium catalyst component and w hty first battery reactor and at a deviation from the desired values of molecular weight and the weight content srednemolekul molecular weight and low molecular weight polymer fractions varying magnitude intermediate process parameters, expense and katalizatsch T1ggaiov x n component

mtixTbi, respectively, in one of the medium and last battery reactors. The regulation of the molecular weight and the weight content of the polymer fractions is carried out by varying the flow rates of the charge into the battery reactors, where the catalyst components are not supplied, and the intermediate polymer value is used as an intermediate process parameter.

This method has limited possibilities with regard to the possibility of expanding the molecular weight distribution of the polymer.

The purpose of the invention is the molecular mass distribution of poly-

5 measure.

This goal is achieved by the fact that in a known method of controlling the molecular weight distribution of polybutadiene in the main auth. X7 536195 before ipmeng: the temperature of the charge mixture in the first, one but the middle and the last in the course of the rocket mixture of the battery's reactors. dependencies

Yumezeni from the mass of the high molecular weight, medium molecular weight or low molecular weight fraction of the resulting poltler.

The drawing shows a block diagram of the control system.

The method of regulating RioMs molecules of the distribution polybutadiene is carried out as follows.

The mixture (polymerizat) sequentially perepuskayut through the reactor 1,2,3,4,5,6. Additional blend flows are fed to reactors 3 and 5. The catalyst is fed to peajcropa 1,3,5. Charge consumption in reactors 1,3,5 are stabilized by corresponding eection by regulators 7, 8, 9, which affect valve 10, 11, 12. Regulators 7, 8, 9 receive information on the charge of the charge from sensors 13, 14, 15. The consumption of catalyst in reactors 1,3,5 20 is stabilized by the corresponding regulators 16,17,18 acting on valves 19, 20, 21. Regulators 16,17,18 Obtain information on the consumption of the catalyst from the corresponding sensors 22, 23, 24. At the exit of the reactors 1,3,5 with the help of regulators 25,26,27, the stabilization of the Schruite is in the center of the reactor; in olimerizat (viscosity of polymerizate), measured by the corresponding sensors 28,29,30. Regulatory effects, regulators 25 ,. 26,27 carried out on assignments to the regulators 16, 17, 18 of the catalyst consumption (for example, the aluminum component of the catalyst). At the outlet of the reactors 1,3,5 with the help of regulators 31, 32, 33 stabilize the temperature of the polymer as measured by the corresponding sensors 34, 35,. With the help of the regulators 31, 32, 33, the settings of the regulators 37, 38, 39 of the temperature of the masses are changed, which affect the corresponding valves 40,41,42. Regulators 37, 38, 39 receive information from the corresponding sensor 43,44,45 of the temperature of the switch. Valve 40,41,42 change the temperature in chillers 46,47,48. At the outlet of the reactor 6, using a sensor 49, molecular molecules are measured (the polymer’s acoustical distribution, the signal from sensor 49 is fed to a computing device 5O, which determines the molecular weight and weight content of the molecular molecule, molecular weight and low molecular weight fractions.

Claims (1)

When the molecular weight and weight content of the high molecular weight polymer fractions deviate from the specified values, the average daily process parameter, such as polymer viscosity or polymer concentration, and the costs, such as titanium catalyst component and charge, in the first battery reactor, change with the cost of the polymer unit 50, and when the deviation from the task of the molecular weight and weight content of the average molecular weight and low molecular weight fractions of the polymer is changed, using a computational device The values of intermediate parameters of the process, costs, for example, titanium (the solid component of the catalyst and the charge, respectively, in one of the middle and last reactors are battled by the corresponding regulators. At the same time, the molecular weight and weight content of the polymer fractions are controlled by changing the flow rate battery reactors where the catalyst components are not supplied. As an intermediate parameter of the Hess process, ay or polymer should also be used. When the specified weight content of high molecular weight, medium molecular weight and low molecular weight polymer fractions is exceeded, the computing device 5O relieves the expenditures in sectors 1, 3.5, i.e. Reduces the task to the regulators 7,8,9. When decreasing from setting the weight-bearing content of the said polymer fractions, setting the regulators 7, 8, 9 increases. When the molecular weight of the high molecular weight, medium molecular weight and low molecular weight fractions of the polymer is exceeded by a given amount, the computing device 50 increases the temperature of the charge and, consequently, the temperature in the reaction zone by increasing the tasks to the reporters 31,32,33, sequentially or simultaneously in steps. And so it increases the concentration of the polymer (viscosity of the polymerizate) by increasing the setting, respectively, of the regulators, 27. When the molecular weight of a high molecular weight, medium molecular weight and low molecular weight polymer fractions is set at a given molecular weight, the computing device 5O will reduce, sequentially or simultaneously, the flow rate by 5 7245 task reduction, respectively, regulators 31,32,33, a also reduces the polymer concentration (viscosity of the polymerizate) by reducing the tasks, respectively, to the regulators 25,26,27.s. In addition to increasing and decreasing the charge temperature or as a technical equivalent to the specified regulation, it is possible to use, respectively, a decrease in the flow rate of the refrigerant circulating in the jacket of the reactors (or an increase in the temperature of this refrigerant) and an increase in the consumption of the refrigerant (or a decrease in its temperature) .15 As applied to regulating the MWD of the polymer during the isoprene polymerization, The pairs of process meters in the reactors are equivalent to changes in consumption of the 20,256 complex catalyst. The first, middle, and last reactors of a battery with the HSHOT in parallel, the claims of the invention. The method of regulating the molecular mass distribution (ha of polybutadiene according to Aut. St. No. 536195, is also distinguished by the fact that, in order to expand the molecular mass distribution of the polymer the temperature of the charge in the first, one of the middle and last along the reaction mixture of the battery reactors, depending on the change in the corresponding molecular weight of the high molecular weight, medium molecular weight or low molecular weight fraction of the polymer obtained.