SU899057A1 - Device for automatic control of extraction rectification process - Google Patents

Description

(54) DEVICE FOR AUTOMATIC REGULATION OF THE EXTRACTIVE RECTIFICATION PROCESS111

one

The invention relates to devices for the automatic regulation of the process of extractive distillation, B-partly the process of extractive distillation in the processing of waste production of vinyl acetate and its derivatives, and can be used in the chemical and petrochemical industry.

A device for automatic control of the rectification process is known, which contains a temperature controller connected to the feed valves in several points of the column 1.

The closest in technical essence to the invention is a device for automatic control of the extractive column process, containing sensors for raw material consumption, solvent, coolant, sensor for raw material composition, solvent and heat flow regulators, computational, corrective, matching blocks, dynamic filter and valves supply of solvent and coolant 2.

However, due to the unstable operation of the column, the known device does not provide high quality products.

The purpose of the invention is to improve the quality of products by ensuring the stable operation of the column.

ten

This goal is achieved in that the device is equipped with an adder and ratio controllers, wherein the solvent consumption sensors, the composition and consumption of the raw material are connected to the inputs of the first ratio control, the output of which is connected to the solvent supply valve, the raw material consumption sensors and the solvent are connected to the inputs adder, the output of which

Claims (2)

20 is connected to one of the inputs of the second ratio controller, the other input of which is connected to the sensor coolant flow rate, and the output of the second ratio controller is connected to the coolant supply valve. In addition, a temperature controller is connected to the valves on the front of the raw material and solvent supply. The drawing shows a schematic diagram of the device. The device contains a rectification column 1, a boiler 2, sensors 3 of the composition of the raw material, recording device A, sensors 5-7 of the consumption of raw materials, solvent, heat carrier, respectively, measuring devices 8-10, regulators 11 and 12 ratios, control valves 13 -16, an expense accumulator 17, a temperature sensor 18, a temperature controller J. The device works as follows. The regulator P., having received a pulse from the device 4, which registers the composition of the food, regulates the ratio of the expenses of the food and solvent, registering accordingly the devices 8 and 9 in accordance with the change of the composition of the food to the control valve 13. At the same time, the signal from the device 8, recording the flow power is fed to the input of the adder 17, the input of which is the signal from the device 9, which records the consumption of solvent. The ratio controller 12 provides a certain ratio between the total flow rate of the feed and the solvent and the flow rate of the secondary steam supplied to the boiler 2 of the bottom of the column 1 by acting on the control valve 14 installed on the secondary steam supply line. The temperature controller 19, get a pulse from the temperature sensor I8 on the control plate of the column, acts on the control valve 15 and 16, changing the relative position of the feed points and the solvent. The use of the proposed device in the processing of waste products of vinyl acetate and its derivatives will lead to an increase in the conversion degree of methyl acetate hydrolysis, a decrease in methyl acetate recycling, a decrease in the benzene consumption coefficient, an increase in the yield of acetic acid and an increase in its quality, since benzole breakthrough into the bottom liquid is 0 , 05%. Claim 1. Device for automatic control of extractive distillation process, containing sensors for raw material consumption, solvent, heat carrier, temperature controller in the column, raw material composition sensor, solvent and heat carrier flow controllers, valves on the raw material supply lines, solvent and heat carrier, different the fact that in order to improve the quality of products by ensuring the stable operation of the column, it is equipped with an adder and ratio controllers, while the flow sensors of the solvent, tava and raw materials consumption are connected to the inputs of the first ratio controller, the output of which is connected to the solvent supply valve, the raw material and solvent flow sensors are connected to the inputs of the adder, the output of which is connected to one of the inputs of the second ratio controller, the other input of which is connected to a coolant flow sensor, and the output of the second ratio controller is connected to the coolant supply valve. 2. A device according to Claim 1, characterized in that the temperature controller is connected to the valves on the raw material and solvent supply lines. Sources of information taken into account during the examination 1. USSR author's certificate 544441, cl. B 01 O 3/42, 1975. 2. USSR author's certificate for application No. 2671131/26, cl. B 01 D 3/42, 1978.