SU1172924A1 - Method of automatic control of ethylethoxsilane synthesis process - Google Patents

Abstract

A method for automated regulation of the synthesis of ETSH1ET-, OXYSIPANES in a semi-continuous reactor with the supply of the reaction mixture from the measuring device by measuring the amount of heat removed by the refrigerant and adjusting the temperature of the reaction mixture in the reactor by changing the flow rate of the refrigerant, which is different, it is different. with . In order to reduce energy consumption, improve the quality of the finished product and reduce the time of the synthesis process, the supply of the reaction mixture is changed depending on the rate of change of the level in the measuring device with a correction for the amount of heat removed by agent C and the rate of change (P refrigerant at the outlet of reactor jackets.

Description

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The invention relates to methods for automatically controlling the synthesis of ethyl ethoxysilanes in semi-continuous reactors and can be used to automate the production of oligo-organosiloxanes.

The purpose of the invention is to reduce the energy consumption of the process, improve the quality of the finished product and reduce the synthesis time.

The drawing shows a diagram of the implementation of the method.

The reaction mixture from mernik 1 through control valve 2 enters the reactor 3 for the synthesis of ethylethoxysilanes. The heat of reaction is removed by means of a cooling jacket, to which refrigerant is supplied through line 4. The temperature in reactor 3 is measured by sensor 5 and stabilized by regulator 6 by acting on control valve 7. The temperatures at the inlet and outlet of the jacket of the reactor 3 are measured by sensors 8 and 9, respectively, converted by converters 10 and 11 into unified output signals, which are amplified by block 12 of algebraic rooming. Refrigerant flow rate supplied to the jacket of the reactor

line 4 is measured by sensor 13 and is converted into a unified output signal by converter 14. Signals from block I2 and converter 14 are fed to a multiplying device 15, the output of which is signal to block 16 of algebraic summation. Block 16 also receives the output signal of converter 11 through the device 17 for direct predisposition. The level in measuring device 1 is measured by sensor 18, converted by converter 19 into a unified output signal which is fed to regulator 20 as the current value of the controlled variable. The regulator 20 also receives a correction signal from the block 16. The output of the regulator 20 is connected to the control valve 2 installed on the pipeline entering the reaction mixture into the reactor 3..

The automatic control system works as follows.

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The temperature in the reactor 3 is stabilized by a regulator 6, which, acting on the control valve 7, changes the coolant supply to the jacket 5 of the reactor. The amount of heat released during the reaction, proportional to the conversion rate, characterizes indirectly the reactor productivity. However at high speed

10 of supplying the reaction mixture (especially at the very beginning of entry) the heat removal system does not always provide for the removal of excess heat from the reaction zone, and the temperature in the reactor 3

The tS rises despite the maximum refrigerant charge. Therefore, the rate at which the reaction mixture is introduced into the reactor 3 is controlled by regulator 2-20, depending on the rate of change of the level in the measuring device 1, and is corrected for the quantity and rate of change of heat release. The correction signal to controller 20 is generated from the flow measurement results.

5 refrigerant, its temperature differences at the outlet and inlet of the reactor jacket, as well as the rate of change of the refrigerant temperature at the outlet of the jacket. reactor.

Q As you enter the reaction demolition, the conversion rate decreases, the amount of heat release decreases, and to intensify the process, controller 20 increases the rate of level change in the measuring device 1, and consequently, the input rate of the reaction mixture, bringing it to the maximum value at the end of the input stage. Thus, the introduction of the reaction mixture into the reactor 3 is carried out in the shortest possible time, limited by the given input rate and the amount of heat generated.

Using the method of automatic regulation of the process for the synthesis of ethyl ethoxysilanes makes it possible to reduce and more precisely regulate the synthesis time, reduce the energy consumption for the process and improve the quality of the finished product. Implementations

 automatic control systems can be implemented on the basis of serially produced instruments by the domestic industry, for example devices of the pneumatic branch of the SHG

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Claims (1)

METHOD FOR AUTOMATIC REGULATION OF THE PROCESS OF SYNTHESIS OF ETHYLETOXYSILANES in a semi-continuous reactor with feeding the reaction mixture from the measuring device by measuring the amount of heat removed by the refrigerant and controlling the temperature of the reaction mixture in the reactor by changing the refrigerant flow rate, characterized in that, with the aim of improving energy the quality of the finished product and reducing the time of the synthesis process, the flow of the reaction mixture is changed depending on the rate of change of the level in the measuring device with correction to the amount of heat removed by the refrigerant, and the rate of change of the temperature of the refrigerant at the outlet of the reactor jacket. SU, .. 1172924 1 1172924 2