SU979379A1 - Method for controlling process of polymerization of conjugated dienes - Google Patents

Description

The invention relates to methods for controlling the polymerization process of conjugated dienes in the presence of a complex catalyst and can be used in the synthetic rubber industry.

There is a method of controlling the process of polymerization of conjugated dienes by stabilizing the Mooney viscosity of the polymer by changing the catalyst consumption and changing the consumption of the organoaluminum component of the catalyst depending on the ratio of the catalyst components in the charge stream 1.

This method is limited in accuracy by stabilizing the Mooney viscosity of the polymer, since the accuracy of measurement of the ratio of catalyst components is limited due to their low concentrations in the charge stream.

Closest to the invention) is a method for controlling the polymerization process of conjugated dienes with the introduction of an organo-aluminum component or lithium butyl into the mixture by stabilizing Mooney viscosity and / or plasticity of the polymer, bypassing a portion of the mixture flow

catalyst by changing the flow rate of one of the material flows Ij.

However, the known method is characterized by insufficient accuracy of Mooney viscosity stabilization due to the limited accuracy of measuring the flow rate of the bypassed charge flow, depending on which the consumption of the organoaluminum component of the catalyst or lithium butyl varies.

The aim of the invention is to improve the accuracy of the stabilization of the viscosity of the polymer according to Moon.

The goal is achieved by

15 that according to the method of regulating the process of polymerization of conjugated dienes with the introduction of the organoaluminum component or lithium butyl into the mixture by stabilizing the viscosity

20 Mooney and / or plasticity of the polymer, bypassing part of the charge stream, introducing into this part the flow of the catalyst components and stabilizing the ratio of the catalyst components

25 by changing the flow rate of one of their material flows, stabilize the consumption of catalyst co-factors that are fed to the bypass flow of the charge, and change the consumption of organo-aluminum

30 components or lithium butyl into the main stream of the charge, depending on the ratio of the catalyst components in the bypass stream of the charge. This technique improves the accuracy of stabilization of Mooney polymer viscosity, since the ratio of catalyst components in the bypassed flow can be measured with a diel meter (type) with an accuracy of 1 rel.%, And flow measurements carried out at serial diaphragm flow meters are made with much lower accuracy (4-5 rel,%). All this as a whole provides a higher degree of purification of the charge from impurities, and, consequently, an increase in the accuracy of stabilization of Mooney viscosity of the polymer. The drawing shows a flowchart with which the proposed method is implemented. The block diagram shows reactor 1 regulators 2, 3, and 4; flow sensors 5.6 and 7; regulatory bodies 8, 9 and 10; Mooney viscosity sensor 11; regulator, .1.2; pipeline bypass part of the charge 13; controls 14, 15, and 16; flow sensors 17,18 and 19 regulators 20, 21 and 22; sensor monitoring the ratio of components of the catalyst 23; regulator 24 pipeline of organo-aluminum component or lithium butyl 25; controller 26; The flow sensor 27 and the regulator 28. The control system shown in the block diagram works as follows. The reactor 1 is supplied with charge, aluminum and titanium components of the catalyst, the costs of which are stabilized, respectively, by regulators 2, 3, 4, receiving information about the costs from sensors 5, b, and affecting regulators 8, 9, 10. At the output of The battery has a Mooney sensor 11, which supplies information to the controller 12, stabilizing this value by a change in a certain ratio of the catalyst component costs, i, e. by changing the tasks to the controllers 3 and 4. When the Mooney viscosity of the polymer exceeds a given value, the catalyst consumption increases and vice versa. A portion of the charge stream is bypassed through conduit 13, into which concentrated aluminum and titanium 1 solvents are introduced: on the catalyst components. Bypass flow rates of the charge, aluminum and titanium catalyst components are stabilized -, respectively, by regulators 14,15,16 receiving information about the costs from sensors 1 18, 19 and acting on regulators 20, 21, 22, Behind the entry point of the catalyst components on the pipeline 13 is installed the sensor 23 of the control of the correlation of the catalyst components, which feed the information tion to the controller 24, stabilizing the organoaluminum component value variation rate butyllithium or introduced through conduit 25 into the main stream of charge, i.e., changing the task to controller 26, which stabilizes this flow rate. The controller 26 receives information about the flow rate from the sensor 27 and acts on the valve 28. When the ratio of the organoaluminum component to the titanium catalyst component is exceeded by a given value, the consumption of the organoaluminum component introduced into the main flow of the charge is reduced and vice versa. The physical essence of the operation of the regulator 24 is that it increases by n times the difference between the total consumption of the organo-aluminum combination introduced into the bypass flow of the shihag and the flow that creates the given ratio of catalyst components, T.e. increases by a factor of n the consumption of the organoaluminum component, which is decomposed by impurities in the bypassed SioTOKe charge (n is the ratio of the expenditures of the main and bypassed flows of the charge). Thus, the accuracy of Mooney viscosity stabilization according to the polymer is improved, and, in addition, the consumption of the catalyst is reduced, since this significantly reduces the concentration of impurities in the mixture. According to experimental data, the accuracy of maintaining the Mooney viscosity of the polymer (M) when applying the proposed method is characterized in comparison with the known table. As can be seen from the table, the mean square deviation of the Mooney viscosity according to the proposed method is lower than that known, while the consumption of the titanium component in the production of SCD rubber is reduced by 0.5 mol per ton of polymer.

invention formula

The method of regulating the polymerization process of conjugated dienes with the introduction of the organoaluminum component or lithium butyl into the mixture by stabilizing the Mooney viscosity and / or plasticity of the polymer / bypassing part of the stream of the catalyst, introducing the ratio of the catalyst components into this part of the stream by changing the flow rate of one of the material flows, which differ from fife in that with a chain of increasing the accuracy of stabilizing Mooney viscosity

polymer, stabilize the costs of the catalyst components supplied to the bypass stream of the charge, and change the consumption of the organo-aluminum component or lithium butyl into the main stream of the charge, depending on the ratio of the catalyst components to the bypass stream of the charge.

Sources of information taken into account in the examination

1. Author's certificate of the USSR 636237, cl. C 08 F 136/04, 1976,

2. Authors svtseltselstvo USSR 774184, cl. C 08 F 136/04, 1978 (prototype).

Claims (2)

Claim The method of controlling the polymerization of conjugated dienes with the introduction of an organoaluminum component or lithium butyl into the mixture by stabilizing the Mooney viscosity and / or plasticity of the polymer, bypassing a portion of the charge stream, introducing catalyst components into this part of the stream and stabilizing the ratio of catalyst components in it by changing the flow rate of one of the material flows , characterized in that, in order to increase the accuracy of stabilization of the Mooney viscosity of the polymer, they stabilize the costs of the components of the catalyst, avaemyh in baypasiruemy flow charge, and changing flow organoaluminum component or butyllithium in ⁵ bases hydrochloric flow of charge depending on the ratio of the catalyst components in baypasiruemom charge stream. ₀ Sources of information, ' ^and taken into account in the examination 1. USSR author's certificate No. 636237, cl. C 08 F 136/04, 1976. 2. USSR copyright certificate W 774184, CL C 08 F 136/04, 1978 15 (prototype). screw Titanium ~ containing t opponent * Lupinia containing yopponent