The method of automatic control of two-stage dehydrogenation reactor

 

(57) Abstract:

In the method of automatic control of two-stage reactor for the dehydrogenation of hydrocarbons by stabilizing the temperature of the reaction mixture at the entrance to the first and second stage reactor temperature of superheated steam coming from the superheater furnace at appropriate stages of the reactor depending on the composition of the gas after contact of the corresponding stage of the reactor, the temperature of the reaction mixture at the inlet of the first and second stage reactor additionally alter in accordance with the optimal value of the index of the catalyst. The technical result of the invention is the reduction of the specific consumption of raw materials by 1.2%. 1 Il.

The invention relates to the field of automation of production processes and can be used in the petrochemical industry in the production of styrene by dehydrogenation of ethylbenzene, styrene by dehydration of methylphenylcarbinol, obtaining a-methylstyrene by dehydrogenation of cumene in the production of divinylbenzene by dehydrogenation of diethylbenzene and other Known method of automatic control of two-stage dehydrogenation reactor uglevodoroy mixture at the entrance to the first and second stage reactor temperature of superheated steam, coming from superheating furnace at appropriate stages of the reactor.

The known method has limitations in reducing energy consumption for the process because of the presence of perturbations in the composition of raw materials.

The closest in technical essence is a way to automatically control two-stage dehydrogenation reactor (ed.St. USSR N 717025, M CL 07 /10: 05 D 27/00, BI N 7, 1980), whereby to reduce the energy consumption of the process while maintaining the specified performance of the reactor alter the temperature of the reaction mixture at the entrance to the first and second stages of the reactor depending on the composition of the gas after contact of the corresponding stage of the reactor.

The disadvantage of this method is only reduced energy costs, but there is no possibility of reducing the specific consumption of raw materials.

The aim of the invention is the reduction of specific consumption of raw materials.

This objective is achieved in that in the known method of automatic control of two-stage reactor for the dehydrogenation of hydrocarbons by stabilizing the temperature of the reaction mixture at the entrance to the first and second stages of the reactor change is depending on the composition of the gas after contact of the corresponding stage of the reactor, the temperature of the reaction mixture at the inlet of the first and second stage reactor additionally alter in accordance with the optimal value of the index of the catalyst, which varies according to the formula:

ANDto= WY0,01K1(C1-C2/K2)

where W is the volumetric rate of the raw material, h-1;

Y is the density of the raw material, t/m3;

C1the cost of the products produced, RUB/t;

C2- the cost of raw materials, RUB/t;

K1- access to missing raw materials, wt.%;

TO2- access to the decomposed raw material wt.%.

The outputs on missing and decomposed raw materials are determined based on the composition of the raw material and the contact strip.

The optimal values of the index of the catalyst allows for a given performance of manufactured products to meet the minimum specific consumption of raw materials and thus the minimum cost of commercial products.

The method of automatic control of two-stage dehydrogenation reactor, shown in Fig.1, is as follows.

The flow and composition of the feedstock entering into the first stage 1 of the reactor, measured by corresponding sensors 2 and 3. Contact the gas from the first stage 1 of the reactor is using the sensor 6 and adjust the regulator 7, acting on the valve 8 will supply fuel gas to the first section 9 superheating furnace.

The temperature in the second stage 5 of the reactor is measured by sensor 10 and regulate the regulator 11 acting on the valve 12 to supply fuel gas to the second section 13 superheating furnace.

The composition of the contact of the gas after the first stage 1 of the reactor is measured by sensor 14 and adjust the regulator 7 via function blocks 15 and 16.

The composition of the gas after contact of the second stage 5 of the reactor is measured by the sensor 17 and adjust the controller 11 via function blocks 15 and 16.

Using functional blocks 15 and 16 according to the signals from the sensors 2, 3, 14, 17 correct job of regulators 7 and 11, providing an optimal value of the index of the catalyst at a given performance.

The use of the proposed method will reduce the specific consumption of raw materials by 1.2%.

The method of automatic control of two-stage reactor for the dehydrogenation of hydrocarbons by stabilizing the temperature of the reaction mixture at the entrance to the first and second stage reactor temperature of superheated steam coming from properare the relevant stage of the reactor, characterized in that the temperature of the reaction mixture at the inlet of the first and second stage reactor additionally alter in accordance with the optimal value of the index of the catalyst, which is determined by the formula:

ANDto= W Y 0,01 K1(C1- 100 C2/K2)

where W is the volumetric rate of the raw material, h-1;

Y is the density of the raw material, t/m3;

C1the cost of the products produced, RUB/t;

C2- the cost of raw materials, RUB/t;

K1- access to missing raw materials, wt.%;

K2- access to the decomposed raw material wt.%.

 

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