SU889651A2 - Method of automatic control of film sulphonation reactor - Google Patents

Description

one

The invention relates to automatic control in chemical technology, namely, automatic control of a film reactor for the sulfation of organic products, for example, higher fatty alcohols, alkyl benzenes, ethoxylated alcohols with gaseous sulfuric anhydride mixed with air or an inert gas, and can be used in the chemical industry.

According to the main author. St. No. 592809 a method is known which consists in stabilizing the temperature in a reactor and controlling the flow rate of an organic product depending on a given ratio of expenses of a sulfating agent and an organic product with correction according to the physicochemical parameter of the output product, and the value of setting the ratio of expenses of sulfatiruvic agent and organic product changes depending on sulphating agent concentration tlJ.

However, this method does not provide the required accuracy of temperature control in film reactors. This is due to the fact that different consumption of transport air leads to a change in the hydrodynamic situation in the reactor and, accordingly, to a change in the temperature conditions that greatly affect the quality of the products obtained. In addition, controlling the temperature of the sulfomass only at the end of the reactor is, as a rule, not sufficiently effective for film reactors and does not fully reflect temperature changes along its length.

jQ The aim of the invention is to increase the yield of the target product by increasing the accuracy of temperature control in the reactor.

The goal is achieved by the fact that the method further regulates the temperature in the upper section of the reactor by changing the refrigerant supply to this section depending on the refrigerant temperatures at the inlet and outlet of the upper section of the reactor and stabilizes the ratio of the flow rates of sulfating agent and transport air by changing the transport air supply.

The optimal ratio of the costs of sulfating agent and transport air is the value of O, 8, which must be maintained. Increasing this value raises the temperature peak of the liquid flow, which leads to a decrease in the qualitative indicators of sulfomass and the final product (neutralized pastes). With a decrease in this value, the film can be broken, the splash guns and, accordingly, the sulfation of the product, with the formation of coke.

The drawing shows an example of the implementation of this method.

The costs of the sulfating agent and the organic product to the reactor are measured using sensors 1 and 2, the concentration of the sulfating agent is measured by a sensor, 3, the flow rate of the sulfating agent is controlled by regulator 4, and the ratio of the expenses of the sulfating agent and organic product is maintained by the ratio 5 by affecting valve 6.

The cost ratio of the sulfating agent and transport air is controlled by the regulator 7 by the ratio by acting on the valve 8, and the supply of the sulfating agent is controlled by the valve 9. The transport air flow is measured by the sensor 10.

The quality of the output product is measured by sensor II. The temperature of the refrigerant at the inlet and outlet of the upper section of the editor is determined by sensors 12 and 13, the difference of these temperatures is determined by adder 14 and controlled by regulator 15 by acting on valve 16. The temperature at the outlet of the reactor is measured by sensor 7 and controlled by regulator 18 which controls valve 19 on the refrigerant supply line to the lower section of the reactor.

The method is carried out as follows.

When reducing the flow rate of transport air, the signal from the flow sensor 10 is fed to the first input of the ratio controller 7. At the same time, the ratio increases and a control signal is supplied from the ratio controller 7 to the valve 8 installed on the transport air supply line towards its opening, thereby stabilizing the cost ratio of the sulfating agent and transport air.

When increasing, for example, the cooling water temperature at the outlet of the upper section, the signals from the sensors 12 and 13 of temperature go to the first and second inputs of the adder 14, in which the temperature difference between the cooling water at the exit from the upper section and at the entrance to the upper section, as a result, an increased signal is generated at its output. This signal is applied to the temperature controller 15, the signal from which opens the valve 16 installed in the upper section of the cooling water supply line B.

Using the proposed method allows to increase the maximum yield of the target product from 92.0 to 97.4%,

Claims (1)

Invention Formula A method for automatic control of a film sulphation reactor according to the author. St. No. 592809, characterized in that, in order to increase the yield of the target product by increasing the accuracy of temperature control in the reactor, the temperature condition in the upper section of the reactor is additionally regulated by changing the refrigerant charge in this section, depending on the refrigerant temperatures at the inlet and outlet. reactor and stabilize the ratio of costs sulfate agent and transport air by changing the supply of transport air. Sources of information taken into account in the examination I. Copyright certificate. USSR 592809, cl. From 07 To 13/00, 1975. Cy / Jbcpamup Q-iCHfyi (