CN-121988255-A - Continuous flow production system for pesticide intermediate synthesis

CN121988255ACN 121988255 ACN121988255 ACN 121988255ACN-121988255-A

Abstract

The invention relates to the technical field of chemical process control and discloses a continuous flow production system for synthesizing a pesticide intermediate, which comprises a pulsating flow supply module, a distribution state sensing module, a discrete impedance compensation module and a central balance control module, wherein the pulsating flow supply module is used for conveying reactant flow with specific pulsating frequency to a main reaction bearing module, the distribution state sensing module is used for collecting temperature response data of the material flow on the pulsating flow, the discrete impedance compensation module consists of a plurality of groups of impedance adjustment subunits with different path lengths, the central balance control module is used for locking the position of a reaction active area based on the temperature response data and driving the discrete impedance compensation module to switch a topological structure when the position is deviated.

Inventors

Fu Zhouzhou
ZENG JIA
LUO DONGWEI

Assignees

湖南昊华化工股份有限公司

Dates

Publication Date: 20260508
Application Date: 20260410

Claims (10)

1.A continuous flow production system for pesticide intermediate synthesis, comprising: The pulsating flow supply module is coupled to the input end of the system and is used for loading reactant flow with constant direct current basic flow rate and superimposed with specific alternating current pulsating frequency to the system to construct a periodic flow disturbance signal source; The main reaction bearing module is defined with a fixed physical transmission path and a heat exchange boundary and is used for bearing reactant material flows and providing a physical space where chemical conversion occurs as a basic load of the system; The distribution state sensing module is discretely deployed along the transmission path of the main reaction bearing module and is used for collecting temperature response data of reactant flows to flow disturbance signal sources at different path nodes; The discrete impedance compensation module is coupled in series with the output end of the main reaction bearing module and is composed of a plurality of groups of impedance adjustment subunits which have different effective path lengths and can independently execute access or bypass operation; The central balance control module is respectively connected with the distribution state sensing module and the discrete impedance compensation module in a communication mode, and executes the system balance logic of analyzing the temperature response data uploaded by the distribution state sensing module, extracting a temperature fluctuation component phase-locked with the pulsation frequency, establishing an amplitude distribution model of the temperature fluctuation component on a path of the main reaction bearing module, positioning the real-time logic position of the current reaction active area according to the peak value coordinates of the amplitude distribution model, calculating an offset vector of the real-time logic position relative to a preset reference position, generating a topology reconstruction instruction when the module value of the offset vector exceeds a preset dead zone threshold value, sending the topology reconstruction instruction to the discrete impedance compensation module, driving the target impedance adjustment subunit to switch the working state, and compensating the physical residence time required by the reaction through the total transmission path length of the step-type adjustment system on the premise of maintaining the constant basic flow rate of the pulsation flow supply module.
2. The continuous flow production system for synthesizing pesticide intermediates according to claim 1, wherein the distribution state sensing module comprises a plurality of non-invasive sensing units, each sensing unit is attached to the outer boundary of the main reaction bearing module at preset physical intervals, the central balance control module is provided with signal feature extraction logic when processing temperature response data, the central balance control module is provided with digital filtering algorithm with central frequency anchored at pulsation frequency, direct current baseline components and incoherent environmental noise in the temperature response data are stripped, effective alternating current heat signals excited only by chemical heat release response are separated, and the amplitude intensity of the effective alternating current heat signals is defined as a quantization index for judging the reactivity of the system, so that a high-activity reaction area and an inactive heat transmission area are distinguished.
3. The continuous flow production system for pesticide intermediate synthesis according to claim 1, wherein the discrete impedance compensation module adopts a binary weighted topological structure and comprises N cascaded impedance adjustment subunits, wherein each impedance adjustment subunit comprises a specific physical path length And a flow path switching assembly, wherein the path length of the i-th stage of the path switching assembly Follow Wherein The central balance control module modulates the on-off state of each flow path switching component by outputting N-bit binary control code to combine A discrete total system path length.
4. The continuous flow production system for pesticide intermediate synthesis according to claim 3, wherein the discrete impedance compensation module is further integrated with an environmental thermal steady-state maintenance unit, all the extension components are disposed in a temperature control area of the environmental thermal steady-state maintenance unit, and the internal medium temperature of the environmental thermal steady-state maintenance unit is set to be lower than the reaction threshold temperature in the main reaction bearing module, so that the extension components connected to the system loop can provide physical delay impedance and inhibit chemical state evolution of internal materials.
5. The continuous flow production system for synthesizing pesticide intermediates according to claim 1, wherein the central balance control module is embedded with a thermal response gain-based reaction state discrimination model defining a dimensionless thermal response activity index The operation logic is as follows: , wherein, For the amplitude value of the extracted temperature fluctuation component, For the DC temperature component collected by the distribution state sensing module, The central balance control module only judges the thermal response activity index of a certain path node And when the node is lower than a preset deactivation threshold value, confirming that the node is in a reaction termination area, and calculating a target path length compensation amount according to the node.
6. The continuous flow production system for pesticide intermediate synthesis according to claim 1, wherein the pulsating flow supply module comprises a constant flow driving unit for providing fluid power meeting preset basic flow rate requirements, and a pulsating modulation unit coupled to an output end of the constant flow driving unit, wherein a pulsating frequency is loaded in the continuous flow through periodic volume perturbation, and the pulsating frequency is configured to avoid an inherent mechanical resonance frequency band and a power frequency interference frequency band of the main reaction bearing module.
7. The continuous flow production system for pesticide intermediate synthesis according to claim 1 is characterized in that a main reaction bearing module is of a modularized cascading framework and is formed by connecting a plurality of standard bearing sub-modules with uniform specifications in series, sensing nodes of a distribution state sensing module are independently configured at an input port and an output port of each standard bearing sub-module, a discrete monitoring grid with fixed spatial resolution is constructed, and a central balance control module executes spatial interpolation operation logic, wherein amplitude data of two adjacent sensing nodes are utilized, and accurate logic coordinates of peak values of a reaction active region in a node gap are estimated through a Gaussian fitting algorithm.
8. The continuous flow production system for pesticide intermediate synthesis according to claim 1, wherein the system is further integrated with an emergency bypass blocking module connected in parallel between the input end and the output end of the main reaction carrying module, and the central balance control module is further configured with a heat safety defense logic for preferentially triggering the on command of the emergency bypass blocking module to direct the reactant stream to the downstream safety processing unit when the peak value of the amplitude distribution model is monitored to exceed a preset safety enthalpy limit or the logical coordinate displacement rate of the reaction active zone exceeds a preset time derivative threshold.
9. The continuous flow production system for synthesizing pesticide intermediates according to claim 1, wherein the central balance control module regulates the discrete impedance compensation module to follow anti-vibration hysteresis logic, wherein the anti-vibration hysteresis logic is provided with a dead zone interval When the absolute value of the difference between the calculated target path length compensation amount and the current actual path length is larger than the dead zone interval And when the detection noise is detected, a topology reconstruction instruction is issued to inhibit frequent switching actions of the discrete impedance compensation module caused by the detection noise.
10. The continuous flow production system for synthesizing the pesticide intermediate according to claim 1, wherein a radial mixing enhancement unit is arranged in an internal transmission path of the main reaction bearing module and used for enhancing micro-shear mixing of fluid, a temperature fluctuation component is transmitted along the path under the action of the radial mixing enhancement unit to present a plug flow characteristic, and a central balance control module utilizes a phase delay parameter under the plug flow characteristic and combines a pulsation frequency to carry out auxiliary check on a real-time logic position of a reaction active region and correct amplitude calculation deviation caused by thermal resistance change of a transmission boundary.

Description

Continuous flow production system for pesticide intermediate synthesis Technical Field The invention belongs to the technical field of chemical process control, and particularly relates to a continuous flow production system for synthesizing a pesticide intermediate. Background In the industrial production of pesticide intermediates and fine chemicals, continuous flow technology gradually replaces traditional batch kettle technology due to high heat exchange efficiency, small liquid holdup and good intrinsic safety, in the production system, accurate control of residence time of reaction materials in a runner is a key for ensuring complete conversion of raw materials and inhibiting generation of byproducts, the general practice in the industry is to calculate theoretical residence time required based on chemical reaction dynamics, and match a time window by setting constant feed flow rate with the length of a reactor pipeline, in order to monitor the reaction progress in real time, the existing mainstream technical scheme is generally provided with a plurality of temperature sensors along the reaction runner, the physical position of the reaction front is deduced by utilizing the temperature rise distribution along the reaction front generated by exothermic reaction, and when displacement of the reaction front due to fluctuation of working conditions is monitored, a control system generally changes the flow rate by adjusting the rotation speed of a feed pump, so that the actual residence time of the materials is corrected. However, when a complex pesticide intermediate reaction system with high viscosity and easy crystallization or containing high molecular impurities is processed, the control strategy based on static temperature monitoring and flow rate adjustment faces serious physical challenges, along with the prolongation of a continuous production period, a layer of dirt layer formed by organic dirt, polymer or catalyst particles is inevitably deposited on the inner wall surface of a reaction runner, so that not only is the friction resistance of flow increased, but also an additional heat insulation barrier is formed, the heat transfer resistance between fluid and a pipe wall is increased, at the moment, the temperature value of the wall surface acquired by an external sensor is gradually lower than the actual reaction temperature in the fluid, a false cold phenomenon of a measurement signal is generated, and the signal distortion caused by interface heat resistance drift reveals the fundamental contradiction in the prior art, namely, the control system cannot distinguish the temperature drop caused by the completion of a chemical reaction and the attenuation caused by the increase of the scale heat resistance in principle, under the condition of lacking an effective distinguishing mechanism, the control system often misjudges that the front edge of the reaction reaches the end point in advance, further falsely triggers a cutting-off instruction, thereby greatly triggering the cutting-off instruction, and the quality of the product is not completely consistent with the quality of the product which is directly discharged. Therefore, how to construct a production system capable of penetrating thermal resistance interference, precisely locking reaction fronts and realizing decoupling control of residence time and mixing efficiency becomes a technical problem to be solved by the invention. Disclosure of Invention In order to solve the problems in the background technology, the technical scheme of the invention is as follows, a continuous flow production system for synthesizing pesticide intermediates comprises: The pulsating flow supply module is coupled to the input end of the system and is used for loading reactant flow with constant direct current basic flow rate and superimposed with specific alternating current pulsating frequency to the system to construct a periodic flow disturbance signal source; The main reaction bearing module is defined with a fixed physical transmission path and a heat exchange boundary and is used for bearing reactant material flows and providing a physical space where chemical conversion occurs as a basic load of the system; The distribution state sensing module is discretely deployed along the transmission path of the main reaction bearing module and is used for collecting temperature response data of reactant flows to flow disturbance signal sources at different path nodes; The discrete impedance compensation module is coupled in series with the output end of the main reaction bearing module and is composed of a plurality of groups of impedance adjustment subunits which have different effective path lengths and can independently execute access or bypass operation; The central balance control module is respectively connected with the distribution state sensing module and the discrete impedance compensation module in a communication mode, and executes the system balance log