SU1583129A1 - Method of controlling process of separation of isopheneisoamylene fractions - Google Patents

Abstract

The invention relates to the automation of rectification processes, can be used in the chemical, petrochemical and other industries and reduces the unit costs of raw materials and energy. The method is carried out as follows. Using the controller 4 for measurement from sensors 5 regulate the supply of raw materials to the column 1 of the extractive rectification. Using regulators 6, 7, the flow of the extractant, respectively, into the column 1a and the reflux into the desorption column 2 is regulated. Using the blocks 16 implemented in the microcomputer 15, the levels in the cubes of the columns 1a, 1b, 2 are regulated using the discrete PID law. The level value is measured by the sensor 8 and the valve 9 is controlled by means of blocks 18, the setting of the controller 6 is adjusted. With the help of blocks 19, the setting of the discrete level regulator is adjusted. Using block 20, the fresh extractant in the tank 3 is regulated by the impact on the valve 13. Block 21 periodically corrects the steam supply to the boiler by affecting the valve 12. Periodically, the block 17 corrects the reference to the reflux regulator 7 to the column 2. 1 Il.

Description

zom.

With the help of regulators 4 on measurement from 35 OF + K.5 (Т№- ft g), if

p & frj

sensors 5 regulate the flow of raw materials in the column 1 extractive rectification. Using regulators 6 and 7, the flow of the extractant into the column 1a and the reflux into the desorption column 2 is regulated, respectively.

Using the blocks 16 implemented in the microcomputer 15, the levels in the cubes of the columns 1a, 16 and 2 are regulated using a discrete PID law, in which the variable

G, TS .GG

I

$ 0

,if a

.

(five)

40

where Gkt is the temperature on the lower control plate of column 2, measured by sensor 10 and averaged 0 over the interval l.h — constant feed component

phlegm.

Discreteness intervals n, t g specify the value of the level at discrete intervals, taking into account the inertia of column 2 (n, T2) measured by sensor 8. The control effect is 30-60 min.

When changing, for example, an increase in the feed of raw materials, the block 18 increases the flow of the extractant to the column 1a. At the same time, block 19 reduces the reference level in cubed columns, which increases pumping out of the cubes. The increase in the inflow of the regenerated extractant into the tank 3 largely compensates for the increase in the selection from the tank, caused by an increase in the flow of the extractant

where Gc is the total feed of raw materials, defined in column 1a. Block 21 through the interval p

increases the steam supply to the boiler of column 2 (direct disturbance compensation), unit 17 controls the temperature

The effect on valve 9 is also left unchanged if the magnitude of the level control error modulo does not exceed the specified value b (it is in the specified deadband).

With the help of block 18 correct the task of the controller 6

OSH- .os

(one)

measured by the sensors 5. With the help of block 19, the task is adjusted to discrete level controllers (realizing OF + К.5 (Т№- ft g), if

p & frj

G, TS .GG

I

$ 0

,if a

isoprene-isoamylene fraction, carried out in series-connected columns of extractive rectification and desorption with recirculation of the regenerated extractant by adjusting the supply of raw material and extractant to the column of extractive rectification, the levels in cubes of the columns by selection of the bottom product, reflux into the columns and steam into the boiler, different so that, in order to reduce

on the control plate, and in case of its severe fall (there is a danger of poor separation) increases the flow of reflux.

To ensure the stable and high-quality operation of the columns, the change in the supply of raw materials is carried out smoothly and, accordingly, the described contours are also smoothly worked out.

Block 20 is triggered when the level in the tank 3 drops, which occurs periodically, the specific consumption of raw materials and energy resources, as a result of the gradual outflow, the level in cubes of hydrocarbons and hydrocarbons is extra-measured. The temperature at the bottom control is the Proposed control of the circulation plate desorption columns, the extractant is determined to provide a sufficiently stable difference between the specified and measured loads on the columns and smooth 15 temperature values and at a value

less than set temperature

the reflux feed to the desorption column is adjusted directly proportional to the specified difference, and the task of adjusting the levels in the cubes of the columns is adjusted back 20 in proportion to the supply of the extractant to the extractive distillation column.

transitions in dynamic modes. The reflux feed, taking into account the temperature on the control plate, ensures efficient and economical desorption column operation.

Claims (1)

Invention Formula The method of controlling the separation process isoprene-isoamylene fraction, carried out in series-connected columns of extractive rectification and desorption with recirculation of the regenerated extractant by adjusting the supply of raw material and extractant to the column of extractive rectification, the levels in cubes of the columns by selection of the bottom product, reflux into the columns and steam into the boiler, different so that, in order to reduce specific consumption of raw materials and energy, the level in cubes of columns is additionally measured, the temperature at the bottom is controlled