SU1627540A1 - Process for controlling of butadiene solution polymerization - Google Patents

Description

(21) 4429174/05

(22) 05.24.88

(46) 02.15.91. Bul K 6 (72) Yu.S.Karnaukhov, Yu.E.Gavrilov, I.P.Golberg, V.I.Vasilyev, L.N.Yanovsk, L.F.Gozenko, E.Ya.Aleksandrov, V.I. Zheludkov, V.S.R. Khovsky and V.A.Drach

(53) 678.762.2.02 (088.8)

(56) USSR Author's Certificate No. 575355, kp. C 08 F 136/04,

C 08 F 2/06, G 05 D 21/00, 1975. USSR author's certificate 785323, кп. C 08 F 136/04, G 05 D 27/00, 1979.

(54) METHOD FOR REGULATING THE SOLUTION POLYMERIZATION PROCESS OF BUTADIENE

(57) The invention relates to the automation of polybutadiene production technology and may be used.

in the synthetic rubber industry. The invention makes it possible to double the accuracy of stabilization in Mo-bone of Mooney and Carrer plasticity of polymer in the process of solution polymerization of butadiene in a battery of reactors with sequential introduction of titanium and aluminum components of the catalyst into the mixture by stabilizing the difference in optical densities of the charge after introduction the titanium component of the catalyst and polymerisation by changing the consumption of the aluminum component of the catalyst and stabilizing the optical density of the charge at the above ohm titanium catalyst, wherein the optical density measured at a wavelength corresponding to the absorption of the titanium catalyst component. 1 tab., 2 Il.

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This invention relates to the automation of polybutadiene production technology and may find application in the synthetic rubber industry.

The purpose of the invention is to improve the accuracy of the stabilization of Mooney viscosity and Carrer plasticity.

The essence of the invention is that in the interaction of the titanium and aluminum components of the catalyst in the mixture, the optical density of the mixture after introduction into it

the titanium component at its absorption wavelength is reduced to a value corresponding to the amount of the aluminum component that reacted.

FIG. Figure 1 shows the graphs of the optical density of the charge after introducing the titanium component and polymerizate at the output of the first reactor to the wavelength of the emitted light (curve 1 corresponds to the optical density of the charge after introducing the titanium component into it;

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2

2,3,4 curves of the optical density of the polymerizate at the outlet of the first reactor, and the decrease in the optical density at the absorption wavelength of the titanium component corresponds to an increase in the content of the aluminum component in the charge; curves 2,3,4, characterize the content of the aluminum component of the catalyst during the polymerization reaction in the first reactor); in fig. 2 is a block diagram of the installation with the control of the proposed method.

The technological installation contains reactors 1 and 2 of the polymerisation battery, charge supply pipeline 3, the flow of which forms solvent and butadiene flows supplied through pipelines 4 and 5, respectively, pipelines 6 and 7 of the supply of titanium and aluminum components of the catalyst, respectively, pipelines 8 and 9 between 1 and 2 reactors and the output of the second reactor, respectively, flow meters 10, 11 and 12 and control valves 13, 14 and 15, installed on pipelines 5, 6 and 7, respectively, butadiene flow controller 16, tee flow controller 17 ANOVA component flow regulator 18 of the aluminum component, the optical density meter 19 fir, meter 20 of the optical density of the polymer at the outlet of the reactor 1 and the function block 21.

A continuous polymerization process of butadiene is carried out in a reactor battery. In the reactor 1 through the pipeline 3 serves the mixture with. Consumption 30 t / h. The concentration of butadiene in the mixture is 11% by weight.

The flow rate of the titanium component fed through conduit 6 is 200 liters per hour. The value of the optical density of the charge after the titanium component is introduced into it at a wavelength of the emitted light of 500 nm, measured by an optical density meter 19, is 0.6 units, which corresponds to a specified value. The flow rate of the aluminum component supplied through line 7 at a concentration of 0.2 mol / l is 180 liters / hr.

The optical density of the polymer after reactor 1 at the same wavelength of the emitted light, measured by an optical density meter 2J, is 0.36 units.

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The value of the difference between the optical density of the charge after the titanium component of the catalyst is introduced into it and the optical density of the polymerizate after reactor 1, which is determined in the functional unit 21, is 0.24 units. and corresponds to the specified value. Mooney viscosity and Carrer plasticity at the battery outlet are 44 units. and 0.42 units respectively. When the indicated difference in optical densities decreases by 0.08 units relative to the target value caused by an increase in the optical density of the polymer after reactor 1 by 0.08 units (disturbance of impurities in the charge), the flow rate of the aluminum component is increased by means of the regulator 18 and the control valve 15 , until this difference accepts the specified value of 0.24. As a result of an increase in the consumption of the aluminum component, the difference between the mentioned optical densities increases its value relative to the given one by 0.04 units, and therefore its consumption is reduced, stabilizing this difference of optical densities at a given level.

With an increase in the optical density of the charge with the titanium component introduced into it relative to the specified value by 0.15 units, caused by switching to a new batch, the regulator 17 and the regulating valve 14 reduce the consumption of the titanium component so that the specified optical density will value - 0.6 units

At the same time, as a result of the transition process, the optical density of the polymerizate after reactor 1 increases its value by 0.12 units. (increase in the content of the titanium component), and the difference between the optical density of the polymerizate decreases its value by 0.02 units. relative to the set point, therefore, using the regulator 18 and the control valve 15, increase the consumption of the aluminum component. As a result of the adjustment, the optical density of the charge with the titanium component introduced into it decreased its value by 0.04 units. . with respect to a given, in connection with this increase the consumption of the titanium component, stabilizing the value

specified optical density at a given value.

In this case, the optical density of the polymer after reactor 1 decreases its value to 0.3 units. (decrease in the content of the titanium component), and the difference between the optical density of the charge with the titanium component introduced into it and the optical density of the polymerizate after reactor 1 increases its value by 0.02 units. relative to the target, therefore, the consumption of the aluminum component is reduced by setting the value of the specified difference to 0.24 units. Process parameters and polymer properties are reduced. us in the table.

The regulation of the polymerization process of butadiene in accordance with the proposed method makes it possible to double the accuracy of stabilization of the viscosity with respect to the Flour and the Carrer plasticity of the polymer obtained.

Claims (1)

Invention Formula The method of regulating the process of solution polymerization of butadiene, carrying out the process in a reactor battery with sequential introduction of titanium and aluminum into the mixture ), -. about 627540 catalyst components, measuring the optical density of the polymer at the outlet of the first reactor and affecting the flow rate of the catalyst components, characterized in that, in order to increase the accuracy of Muni stabilization and the Carrel plasticity, the difference between the optical density After the titanium component of the catalyst was introduced into it, the optical density of the polymer at the outlet of the first reactor, measured at a wavelength of 15 corresponding to the absorption of the titanium component of the catalyst, changes the consumption of the aluminum component of the catalyst when the deviation of this difference deviates from the specified value. this difference in the direction of increasing from a given value reduces the consumption of the aluminum component; when deviating from the direction of decreasing from a given value of 25 The consumption and the consumption of the titanium component of the catalyst change depending on the optical density of the charge after introducing the titanium component of the catalyst into it, while decreasing the optical density of the specified value reduces its consumption and increases it when decreasing.