JPH06142490A - Temp. control device of reactor - Google Patents

Abstract

PURPOSE:To precisely hold the temp. reaction liquid in a reactor at a specified temp. by controlling a control valve basing on the temp. difference between the temp. of the reaction liquid and the set temp. and the temp. difference between the temp. of the reaction liquid and the temp. of a cooler and adjusting a flow rate of a cooling medium. CONSTITUTION:The temp. difference between the temp. of the reaction liquid detected by a reaction liquid temp. detecter 18 and the temp. set on a reaction liquid temp. program setting device 23, is obtained by a first program control device 21. Also the temp. difference between the calculated temp. from the temp. of the reaction liquid and the temp. detected by a cooler exit temp. detecter 19 by a substracter 20 and the temp. set on the cooler exit temp. program setting device 24, is obtained by a second program controller 22. By output of both program controllers 21, 22, opening of the control valve is controlled and the flow rate of the cooling medium flowing in the cooler 5 is adjusted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reactor temperature control device for controlling the temperature in a reactor which carries out an exothermic reaction.

[0002]

2. Description of the Related Art In the case of producing crystals in a reactor which undergoes an exothermic reaction, it is necessary to control the temperature of a reaction solution in the reactor so that the temperature of the reaction liquid becomes an accurate predetermined temperature.

Since the temperature of the reaction liquid in the reactor which carries out the exothermic reaction rises due to the reaction, a part of the reaction liquid is taken out from the inside of the reactor by a cooling medium in order to accurately control the temperature to a predetermined temperature. After cooling, the cooled reaction liquid is recirculated into the reactor to keep the temperature of the reaction liquid in the reactor at a predetermined value.

In order to bring the temperature of the reaction liquid in the reactor to a predetermined temperature, conventionally, the temperature of the reaction liquid in the reactor is detected, and the temperature difference between the detected temperature and the predetermined temperature is detected. The control valve opening was controlled.

[0005]

However, there is a time lag in the method of controlling the opening of the control valve for detecting only the temperature of the reaction liquid in the reactor and adjusting the flow rate of the cooling medium flowing to the cooler. However, the temperature of the reaction liquid in the reactor varies within a certain range and cannot be accurately stabilized at a predetermined temperature, so that the quality of crystals generated by the exothermic reaction varies.

The present invention eliminates such conventional drawbacks,
An object of the present invention is to provide a temperature control device for a reactor in which the temperature of the reaction liquid in the reactor is accurately maintained at a predetermined temperature.

[0007]

Means for Solving the Problems The present invention comprises a reactor for carrying out an exothermic reaction, a circulation system for taking out the reaction solution from the reactor and returning the reaction solution to the reactor through a cooler, and the cooler. A cooling medium flow path for flowing a cooling medium, a control valve provided in the cooling medium flow path for adjusting the flow rate of the cooling medium flowing to the cooler, and a reaction liquid temperature detection for detecting the temperature of the reaction liquid in the reactor And a cooler outlet temperature detector for detecting the temperature of the reaction liquid immediately before flowing back to the reactor through the cooler, a detection temperature of the reaction liquid temperature detector and a detection of the cooler outlet temperature detector A subtractor for calculating a temperature difference from the temperature, a reaction solution temperature program setter configured to preset the temperature of the reaction solution in the reactor, and a temperature of the reaction solution detected by the reaction solution temperature detector And set in the reaction liquid temperature program setter A first program controller for detecting a temperature difference from the temperature, a cooler outlet temperature program setter for presetting the temperature of the reaction liquid immediately before flowing back to the reactor through the cooler, A second program controller for detecting a temperature difference between the temperature difference calculated by the subtractor and the temperature set in the cooler outlet temperature program setter;
And an adder for adding the temperature difference detected by the first program controller and the temperature difference detected by the second program controller and controlling the opening of the control valve with the output thereof. The present invention relates to a temperature control device for a reactor.

[0008]

The first difference is the temperature difference between the temperature of the reaction liquid detected by the reaction liquid temperature detector and the temperature set by the reaction liquid temperature program setting device.
The temperature difference calculated by the subtractor, which is obtained by the program controller of the reaction liquid, and the temperature detected by the reaction liquid temperature detector and the temperature detected by the cooler outlet temperature detector are input. The temperature difference from the temperature set in the outlet temperature program setter is obtained by the second program controller, and the output of both program controllers controls the opening of the control valve to flow the cooling medium to the cooler. The temperature of the reaction liquid in the reactor can be accurately maintained at a predetermined temperature by adjusting the temperature.

[0009]

Embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 is a system diagram of an embodiment of the present invention, in which a reaction liquid 2 is placed in a reactor 1 for carrying out an exothermic reaction and agitated by an agitator 3. The reaction liquid 2 is sucked and taken out from the bottom of the reactor 1 by the pump 4, and is circulated to the reactor 1 by the circulation system 6 passing through the cooler 5.

A cooling medium flow path 7 for flowing a cooling medium is connected to the cooler 5. The inflow side of the cooling medium flow path 7 is branched into two paths, the cooling water inflow path 9 is connected via the switching valve 8, and the chiller water inflow path 1 is connected via the switching valve 10.
1 is connected. Cooling water flows into the cooling water inflow passage 9, and chiller water having a temperature lower than that of the cooling water (which is provided with a cooling device to actively lower the temperature) flows into the chiller water inflow passage 11. It is like this. The outflow side of the cooling medium flow path 7 also branches into two paths, which are connected to the cooling water outflow path 13 via the control valve 12 and to the chiller water outflow path 15 via the control valve 14.

The switching valve 8 and the control valve 12 described above are controlled by the cooling water controller 16, and the switching valve 10 and the control valve 14 are controlled by the chiller water controller 17. The switching valve 10 is either fully open or fully closed, and the control valve 12 and the control valve 14 are adjusted in opening degree. When the switching valve 8 and the control valve 12 are controlled to open, the switching valve 10 and the control valve 1
4 is controlled to be closed, and when the switching valve 10 and the control valve 14 are controlled to be opened, the switching valve 8
The control valve 12 and the control valve 12 are controlled so as to be closed, and cooling water or chiller water having a temperature lower than that of the cooling water is selected for the cooler 5, and the flow rate is adjusted and flows as described later. It is like this.

The temperature of the reaction liquid 2 in the reactor 1 described above is detected by the reaction liquid temperature detector 18, and the temperature of the reaction liquid immediately before flowing back to the reactor 1 through the cooler 5 is the cooler outlet temperature. It is adapted to be detected by the detector 19.
The temperature of the reaction solution 2 in the reactor 1 detected by the reaction solution temperature detector 18 is the subtractor 20 and the first program controller 21.
The temperature of the reaction liquid immediately before being returned to the reactor 1 detected by the cooler outlet temperature detector 19 is input to the subtractor 20. The subtractor 20 detects the temperature of the reaction liquid 2 in the reactor 1 detected by the reaction liquid temperature detector 18 and the temperature of the reaction liquid immediately before being returned to the reactor 1 detected by the cooler outlet temperature detector 19. The temperature difference is calculated and input to the second program controller 22.

The first program controller 21 and the second program controller 22 have functions of integration, differentiation, proportionality and a function of considering a time delay, and the first program controller 21 has A reaction liquid temperature program setter 23 is connected, and a cooler outlet temperature program setter 24 is connected to the second program controller 22.

In the reaction liquid temperature program setting device 23, a program of a predetermined temperature according to the passage of time such that the reaction liquid 2 in the reactor 1 changes in two stages is preset. The first program controller 21 sets a program for a predetermined temperature of the reaction solution 2 set in the reaction solution temperature program setter 23 and an actual program of the reaction solution 2 in the reactor 1 detected by the reaction solution temperature detector 18. The temperature is compared, and the required cooling amount is detected from the temperature difference and is input to the first corrector 25.

The cooler outlet temperature program setter 24 ideally corresponds to a program of a predetermined temperature as the temperature of the reaction liquid immediately before refluxing to the reactor 1 according to the passage of time of the reaction liquid 2 in the reactor 1. The temperature program is preset. The second program controller 22 compares the temperature program of the reaction liquid immediately before refluxing to the reactor 1 set in the cooler outlet temperature program setting device 24 with the temperature difference calculated by the subtractor 20, The required cooling amount is detected from the temperature difference and is input to the second corrector 26.

The first compensator 25 and the second compensator 26 compensate for the input signal by adding an element of the advance control for controlling earlier and an element of the time lag control considering the time delay and the natural cooling. The correction signals are exchanged with each other, and the correction signals are input to the adder 27. Then, the adder 27 outputs a control signal to either the cooling water controller 16 or the chiller water controller 17 according to the input correction signal.

Next, the operation will be described.

The temperature of the reaction liquid 2 in the reactor 1 which is carrying out an exothermic reaction is detected by the reaction liquid temperature detector 18 and input to the subtractor 20 and the first program controller 21. Then, the first program controller 21 programs the predetermined temperature of the reaction solution 2 set in the reaction solution temperature program setter 23 and the reaction solution 2 in the reactor 1 detected by the reaction solution temperature detector 18. The actual temperature is compared, the required cooling amount is detected from the temperature difference, and it is input to the first corrector 25.

On the other hand, the temperature of the reaction liquid immediately before flowing back to the reactor 1 through the cooler 5 is detected by the cooler outlet temperature detector 19 and input to the subtractor 20, and the reaction liquid temperature detector 18 is detected. The temperature difference from the detected temperature of the reaction liquid 2 in the reactor 1 is calculated and input to the second program controller 22. Then, the second program controller 22 compares it with the temperature program of the reaction liquid immediately before being refluxed to the reactor 1, which is set in the cooler outlet temperature program setting device 24. The temperature of the reaction liquid immediately before being returned to the reactor 1 through the cooler 5 detected by the cooler outlet temperature detector 19, and the temperature of the reaction liquid 2 in the reactor 1 detected by the reaction liquid temperature detector 18. Should have a difference of zero, but in reality there is a difference, so the second program controller 22 detects the required cooling amount from the temperature difference and inputs it to the second corrector 26. .

The first corrector 25 and the second corrector 26 correct their respective input signals and exchange the information of the corrected required cooling amount signals with each other, and input the correction signal to the adder 27. To do. The adder 27 outputs a control signal to the cooling water controller 16 in a range in which the input required cooling amount is small, opens the switching valve 8 and opens the control valve 12 at an adjusted opening, and switches from the cooling water inflow passage 9 to the switching valve. 8, cooling medium flow path 7, cooler 5, cooling medium flow path 7, control valve 1
2. Cooling water is made to flow in the cooling water outflow path 13, and the reaction liquid passing through the cooling device 5 is cooled by the cooling water and then returned to the reaction device 1 so that the temperature of the reaction liquid 2 in the reaction device 1 matches a predetermined temperature. To

If the required cooling amount input to the adder 27 is large, the adder 27 outputs a control signal to the chiller water controller 17 to open the switching valve 10 and the control valve 14 at an adjusted opening degree. Switching valve 1 from water inflow passage 11
0, the cooling medium flow passage 7, the cooler 5, the cooling medium flow passage 7, the control valve 14, and the chiller water outflow passage 15 are made to flow chiller water having a low temperature, and the reaction liquid passing through the cooler 5 is largely cooled by the chiller water having a low temperature. After cooling to the reactor 1, the solution is refluxed to the reactor 1 so that the temperature of the reaction liquid 2 in the reactor 1 quickly becomes equal to a predetermined temperature.

According to the present invention, the chiller water inflow passage 11, the switching valve 10, the control valve 14, and the chiller water outflow passage 15 are not provided, and the cooling water flowing from the cooling medium passage 7 is caused to flow into the cooler 5 to cool the cooler. The reaction liquid passing through 5 may be cooled only by adjusting the flow rate of the cooling water and refluxed to the reactor 1 so that the temperature of the reaction liquid 2 in the reactor 1 matches the predetermined temperature.

[0024]

According to the present invention, the program for the predetermined temperature of the reaction liquid is compared with the temperature of the reaction liquid in the reactor detected by the reaction liquid temperature detector, and the required cooling amount is detected from the temperature difference. , Cooling is required by comparing the temperature difference between the temperature of the reaction liquid just before returning to the reactor through the cooler and the temperature of the reaction liquid in the reactor with the temperature program of the reaction liquid just before returning to the reactor. Since the reaction liquid is cooled by detecting the amount and adjusting the flow rate of the cooling medium flowing to the cooler, the cooling of the reaction liquid in the cooler is performed promptly and appropriately, and the temperature of the reaction liquid in the reactor is accurately measured. The temperature is maintained at a predetermined temperature, and a stable reaction can be performed to produce crystals of uniform quality.

[Brief description of drawings]

FIG. 1 is a system diagram of an embodiment of the present invention.

[Explanation of symbols]

 1 Reactor 2 Reaction liquid 5 Cooler 6 Circulation system 7 Cooling medium flow path 12 Control valve 18 Reaction liquid temperature detector 19 Cooler outlet temperature detector 20 Subtractor 21 First program controller 22 Second program control Device 23 Reaction liquid temperature program setter 24 Cooler outlet temperature program setter 27 Adder

Claims (1)

[Claims] 1. A reactor for carrying out an exothermic reaction, a circulation system for taking out the reaction liquid in the reactor and returning the reaction liquid to the reactor through a cooler, and a cooling medium flow passage for flowing a cooling medium to the cooler. A control valve provided in the cooling medium flow path for adjusting the flow rate of the cooling medium flowing to the cooler; a reaction liquid temperature detector for detecting the temperature of the reaction liquid in the reactor; A cooler outlet temperature detector that detects the temperature of the reaction liquid immediately before refluxing to the reactor, and a temperature difference between the detected temperature of the reaction liquid temperature detector and the detected temperature of the cooler outlet temperature detector are calculated. A subtractor, a reaction solution temperature program setter for presetting the temperature of the reaction solution in the reactor, a reaction solution temperature detected by the reaction solution temperature detector, and the reaction solution temperature program setter Detecting the temperature difference from the temperature set in No. 1 program controller, a cooler outlet temperature program setter configured to preset the temperature of the reaction liquid immediately before flowing back to the reactor through the cooler, and a temperature difference calculated by the subtractor. A second program controller for detecting a temperature difference from the temperature set in the cooler outlet temperature program setting device, a temperature difference detected by the first program controller, and a second program controller detected by the second program controller. A temperature control device for a reactor, comprising: an adder for adding the temperature difference and controlling the opening of the control valve by its output.