Continuous production and preparation method and system of methyl tetrahydrophthalic anhydride

Abstract

The invention relates to the technical field of chemical reaction engineering, and discloses a continuous production and preparation method and system of methyl tetrahydrophthalic anhydride, and the method comprises the following steps: establishing a three-stage DielsAlder reactor of dehydrated amount methyl cyclopentadiene and filtered maleic anhydride, preheating and mixing the dehydrated amount methyl cyclopentadiene and the filtered maleic anhydride based on the first stage of the three-stage DielsAlder reactor, and carrying out continuous production and preparation on the dehydrated amount methyl cyclopentadiene and the filtered maleic anhydride based on the second stage of the three-stage DielsAlder reactor; a mixed reactant is obtained; carrying out catalytic reaction on the mixed reactant by utilizing the second stage of the three-stage DielsAlder reactor to obtain a catalytic reaction compound, and carrying out ionic liquid catalytic enhancement on the catalytic reaction compound by utilizing the third stage of the three-stage DielsAlder reactor to obtain an enhanced reaction compound; recording the infrared spectrum of the enhanced reaction compound to calculate the MCPD conversion rate of the enhanced reaction compound, desolventizing the enhanced reaction compound to obtain methyl tetrahydrophthalic anhydride, and isomerizing the methyl tetrahydrophthalic anhydride to obtain the target methyl tetrahydrophthalic anhydride. According to the invention, the preparation efficiency of methyl tetrahydrophthalic anhydride can be improved.

Description

Technical Field

[0001] The invention relates to a continuous production method and system for methyltetrahydrophthalic anhydride, belonging to the technical field of chemical reaction engineering. Background Art

[0002] Methyltetrahydrophthalic anhydride (MTHPA) is an organic compound with the chemical formula C9H10O3. It is a derivative of phthalic anhydride (o-phthalic anhydride), in which the benzene ring is tetrahydrogenated (i.e., the double bond on the benzene ring is hydrogenated), and a methyl group is attached to one of the carboxyl groups. MTHPA is an important chemical raw material, primarily used as a curing agent for epoxy resins. Its high reactivity, fast curing speed, and excellent curing product properties have led to its widespread application in the curing of epoxy resins. MTHPA can also be used as a curing agent for materials such as polyester resins and alkyd resins, as well as in the production of plasticizers, pharmaceuticals, and pesticides.

[0003] The traditional preparation method of methyltetrahydrophthalic anhydride (MTHPA) usually uses phthalic anhydride as the raw material, undergoing a hydrogenation reaction in the presence of an acidic catalyst to produce tetrahydrophthalic anhydride, which is then esterified with methanol to produce MTHPA. This method has many reaction steps, high energy consumption, and cannot effectively recover the catalyst, resulting in low production efficiency of methyltetrahydrophthalic anhydride. Summary of the Invention

[0004] The present invention provides a continuous production method and system for methyltetrahydrophthalic anhydride, the main purpose of which is to improve the preparation efficiency of methyltetrahydrophthalic anhydride.

[0005] To achieve the above object, the present invention provides a method for continuously producing methyltetrahydrophthalic anhydride, comprising:

[0006] Determining raw materials, wherein the raw materials include methylcyclopentadiene and maleic anhydride, analyzing a molar ratio of the methylcyclopentadiene and the maleic anhydride, and configuring target amounts of the methylcyclopentadiene and the maleic anhydride based on the molar ratio;

[0007] Dehydrating the target amount of methylcyclopentadiene by molecular sieve to obtain dehydrated methylcyclopentadiene, and filtering the target amount of maleic anhydride to obtain filtered maleic anhydride;

[0008] Establishing a three-stage Diels Alder reactor for the dehydrated methylcyclopentadiene and the filtered maleic anhydride, and preheating and mixing the dehydrated methylcyclopentadiene and the filtered maleic anhydride based on the first stage of the three-stage Diels Alder reactor to obtain a mixed reactant;

[0009] catalyzing the mixed reactants using the second stage of the three-stage DielsAlder reactor to obtain a catalytic reaction compound, and enhancing the catalytic reaction compound with an ionic liquid using the third stage of the three-stage DielsAlder reactor to obtain an enhanced reaction compound;

[0010] The infrared spectrum of the enhanced reaction compound is recorded to calculate the MCPD conversion rate of the enhanced reaction compound. According to the MCPD conversion rate, the enhanced reaction compound is desolvated to obtain methyltetrahydrophthalic anhydride, and the methyltetrahydrophthalic anhydride is isomerized to obtain the target methyltetrahydrophthalic anhydride.

[0011] Optionally, the analyzing the molar ratio of the methylcyclopentadiene and maleic anhydride comprises:

[0012] Determine the reaction principle of the methylcyclopentadiene and maleic anhydride;

[0013] Based on the reaction principle, the stoichiometric coefficients of the methylcyclopentadiene and maleic anhydride are analyzed;

[0014] Analyze the side reactions and reaction influencing factors of the methylcyclopentadiene and maleic anhydride;

[0015] constructing a molar ratio control group of the methylcyclopentadiene and maleic anhydride according to the stoichiometric coefficient, the side reaction, and the reaction influencing factor;

[0016] The product distribution of the molar ratio control group was analyzed to determine the molar ratio of methylcyclopentadiene to maleic anhydride.

[0017] Optionally, the subjecting the target amount of methylcyclopentadiene to molecular sieve dehydration to obtain the dehydrated amount of methylcyclopentadiene comprises:

[0018] Determine the molecular sieve of the target amount of methylcyclopentadiene;

[0019] activating the molecular sieve to obtain an activated molecular sieve;

[0020] mixing the activated molecular sieve and the target amount of methylcyclopentadiene to obtain mixed methylcyclopentadiene;

[0021] Calculating the molecular sieve uniformity coefficient of the mixed methylcyclopentadiene;

[0022] According to the molecular sieve uniformity coefficient, the target amount of methylcyclopentadiene in the mixed methylcyclopentadiene is dehydrated to obtain the dehydrated amount of methylcyclopentadiene.

[0023] Optionally, the three-stage DielsAlder reactor for dehydrating methylcyclopentadiene and filtering maleic anhydride comprises:

[0024] defining reactor specifications for the dehydration amount of methylcyclopentadiene and the filtration of maleic anhydride;

[0025] Based on the reactor index, a three-level partition structure of the dehydrated methylcyclopentadiene and the filtered maleic anhydride is established;

[0026] By means of the three-level partition structure, a three-level functional zone for dehydrating methylcyclopentadiene and filtering maleic anhydride is established;

[0027] defining pipeline connections for the three-level functional areas;

[0028] Analyze the linkage synergy coefficient of the three-level functional areas;

[0029] Combining the pipeline connection and the linkage synergy coefficient, a three-stage DielsAlder reactor of the three-stage functional zone is constructed.

[0030] Optionally, analyzing the linkage synergy coefficient of the three-level functional areas includes:

[0031] simulating the reaction of the three-level functional area to obtain reaction data;

[0032] Based on the reaction data, determining the primary outlet temperature, the secondary inlet set temperature, the secondary outlet residual concentration, and the real-time catalytic efficiency of the Hβ molecular sieve of the three-stage functional zone;

[0033] According to the first-level outlet temperature and the second-level inlet set temperature, the first-level-secondary linkage coefficient of the three-level functional zone is calculated using the following formula:

[0034]

[0035] Among them, CC 12 represents the first-level-second-level linkage coefficient of the functional zone, θ represents the temperature term weight coefficient, and e represents the exponential function. represents the temperature sensitivity coefficient, T1 represents the first-stage outlet temperature, T 2,in represents the secondary inlet set temperature, ρ represents the flow term weight coefficient, Q ideal represents the ideal mass flow ratio, Q actual Indicates the actual mass flow rate;

[0036] Calculating the secondary-tertiary linkage coefficient of the tertiary functional zone according to the secondary outlet residual concentration and the real-time catalytic efficiency of the Hβ molecular sieve;

[0037] Based on the first-level-second-level linkage coefficient and the second-level-third-level linkage coefficient, the linkage synergy coefficient of the third-level functional area is analyzed.

[0038] Optionally, the calculating of the secondary-tertiary linkage coefficient of the tertiary functional zone by the secondary outlet residual concentration and the real-time catalytic efficiency of the Hβ molecular sieve comprises:

[0039] Identify the initial catalytic efficiency and sensitivity coefficient of the Hβ molecular sieve in the tertiary functional zone;

[0040] The secondary-tertiary linkage coefficient of the tertiary functional zone is calculated using the following formula based on the initial catalytic efficiency of the Hβ molecular sieve, the sensitivity coefficient, the secondary outlet residual concentration, and the real-time catalytic efficiency of the Hβ molecular sieve:

[0041]

[0042] Among them, CC 23 represents the secondary-tertiary linkage coefficient of the third-level functional area, β represents the sensitivity coefficient, [MCPD] residual Represents the residual concentration at the secondary outlet, R cat represents the real-time catalytic efficiency of Hβ molecular sieve, Q act,0 It represents the initial catalytic efficiency of Hβ molecular sieve.

[0043] Optionally, the method of using the second stage of the three-stage DielsAlder reactor to catalyze the mixed reactants to obtain a catalytic reaction compound comprises:

[0044] determining mixed reactant parameters of the mixed reactant;

[0045] configuring the flow rate of the mixed reactant parameter input to the second stage;

[0046] Based on the flow rate, inputting the mixed reactant parameters into the second stage to obtain a second-stage mixed reactant;

[0047] Determining the bed state of the Hβ molecular sieve catalyst corresponding to the second-stage mixed reactants;

[0048] configuring a reaction temperature gradient for the second-stage mixed reactant;

[0049] Based on the bed state, the reaction temperature gradient and the Hβ molecular sieve catalyst, the second-stage mixed reactants are subjected to a catalytic reaction to obtain a catalytic reaction compound.

[0050] Optionally, the step of using the third stage of the three-stage DielsAlder reactor to perform ionic liquid catalytic enhancement on the catalytic reaction compound to obtain the enhanced reaction compound comprises:

[0051] Identifying an ionic liquid catalyst for the catalytic reaction compound;

[0052] configuring enhanced reaction parameters of the catalytic reaction compound in the third stage;

[0053] Based on the enhanced reaction parameters, using the ionic liquid catalyst to perform ionic liquid catalytic enhancement on the catalytic reaction compound to obtain an initial enhanced reaction compound;

[0054] collecting key reaction parameters of the initial reinforcement reaction compound to analyze reinforcement deviation of the initial reinforcement reaction compound;

[0055] According to the reinforcement deviation, the reinforcement reaction parameters are optimized to obtain optimized reinforcement reaction parameters, so as to perform reinforcement optimization of the initial reinforcement reaction compound to obtain the reinforcement reaction compound.

[0056] Optionally, isomerizing the methyltetrahydrophthalic anhydride to obtain the target methyltetrahydrophthalic anhydride comprises:

[0057] Analyzing the purity of the methyltetrahydrophthalic anhydride;

[0058] Determining the isomerization catalyst of the methyltetrahydrophthalic anhydride according to the purity;

[0059] Configuring the isomerization reaction conditions of the methyltetrahydrophthalic anhydride;

[0060] isomerize the methyltetrahydrophthalic anhydride based on the isomerization reaction conditions and the isomerization catalyst to obtain an isomerized reactant;

[0061] The isomeric reactants are separated to obtain the target methyltetrahydrophthalic anhydride.

[0062] In order to solve the above problems, the present invention also provides a continuous production and preparation system of methyltetrahydrophthalic anhydride, the system comprising:

[0063] a raw material determination module, configured to determine raw materials, wherein the raw materials include methylcyclopentadiene and maleic anhydride, analyze the molar ratio of the methylcyclopentadiene and maleic anhydride, and configure target amounts of the methylcyclopentadiene and maleic anhydride based on the molar ratio;

[0064] a raw material pretreatment module, configured to perform molecular sieve dehydration on the target amount of methylcyclopentadiene to obtain dehydrated methylcyclopentadiene, and filter the target amount of maleic anhydride to obtain filtered maleic anhydride;

[0065] A reactor construction module is used to establish a three-stage DielsAlder reactor for the dehydrated methylcyclopentadiene and the filtered maleic anhydride, and preheat and mix the dehydrated methylcyclopentadiene and the filtered maleic anhydride based on the first stage of the three-stage DielsAlder reactor to obtain a mixed reactant;

[0066] a reactor reaction module, configured to perform a catalytic reaction on the mixed reactants using the second stage of the three-stage DielsAlder reactor to obtain a catalytic reaction compound, and perform ionic liquid catalytic enhancement on the catalytic reaction compound using the third stage of the three-stage DielsAlder reactor to obtain an enhanced reaction compound;

[0067] The methyltetrahydrophthalic anhydride generation module is used to record the infrared spectrum of the enhanced reaction compound to calculate the MCPD conversion rate of the enhanced reaction compound, desolventize the enhanced reaction compound according to the MCPD conversion rate to obtain methyltetrahydrophthalic anhydride, and isomerize the methyltetrahydrophthalic anhydride to obtain the target methyltetrahydrophthalic anhydride.

[0068] First, by accurately determining the molar ratio of the raw materials methylcyclopentadiene and maleic anhydride and configuring the target amount, the accuracy of the reactant ratio can be ensured, thereby improving the efficiency of the reaction and the yield of the product. Secondly, the methylcyclopentadiene is subjected to molecular sieve dehydration treatment to effectively remove the water therein, avoiding the adverse effect of water on the reaction, and improving the purity of the raw materials and the stability of the reaction. At the same time, the maleic anhydride is filtered to remove impurities therein, further optimizing the utilization rate of the raw materials, reducing waste, and lowering production costs. During the reaction process, a three-stage DielsAlder reactor is established, and the reaction is divided into three stages: preheating mixing, catalytic reaction, and ionic liquid catalytic enhancement, thereby realizing segmented control and optimization of the reaction process. This multi-stage reactor design can significantly improve High reaction efficiency, reduced side reactions, thereby improving the yield and purity of the target product. The first stage of the three-stage Diels Alder reactor is used to preheat and mix the dehydrated methylcyclopentadiene and filtered maleic anhydride to obtain a mixed reactant, which provides good initial conditions for subsequent reactions. In the second and third stage reactions, the mixed reactant is subjected to a catalytic reaction and ionic liquid catalytic enhancement, respectively, further improving the selectivity and efficiency of the reaction. By recording the infrared spectrum of the enhanced reaction compound and calculating the MCPD conversion rate, the reaction progress can be monitored in real time, and the reaction conditions can be accurately controlled. According to the MCPD conversion rate, the enhanced reaction compound is desolvated to obtain methyltetrahydrophthalic anhydride, and then through an isomerization reaction, the target methyltetrahydrophthalic anhydride is finally obtained. Therefore, the present invention can improve the preparation efficiency of methyltetrahydrophthalic anhydride. BRIEF DESCRIPTION OF THE DRAWINGS

[0069] Figure 1 A schematic flow chart of a continuous production method for methyltetrahydrophthalic anhydride provided in one embodiment of the present invention;

[0070] Figure 2 A schematic diagram of the reaction temperature gradient for realizing the continuous production method of methyltetrahydrophthalic anhydride provided in one embodiment of the present invention;

[0071] Figure 3 A schematic diagram of a module for realizing the continuous production method of methyltetrahydrophthalic anhydride provided in one embodiment of the present invention.

[0072] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0073] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0074] The present embodiment provides a method for the continuous production of methyltetrahydrophthalic anhydride. The method can be performed by at least one of electronic devices, such as a server or a terminal, that can be configured to perform the method provided in the present embodiment. In other words, the method can be performed by software or hardware installed on a terminal or server device. The server includes, but is not limited to, a single server, a server cluster, a cloud server, or a cloud server cluster.

[0075] Example 1:

[0076] Reference Figure 1 FIG. 1 is a flow diagram of a continuous production method for preparing methyltetrahydrophthalic anhydride according to an embodiment of the present invention. In this embodiment, the continuous production method for preparing methyltetrahydrophthalic anhydride comprises:

[0077] S1. Determine raw materials, wherein the raw materials include methylcyclopentadiene and maleic anhydride, analyze the molar ratio of the methylcyclopentadiene and maleic anhydride, and configure target amounts of the methylcyclopentadiene and maleic anhydride according to the molar ratio.

[0078] It should be explained that the methylcyclopentadiene refers to 5-methyl-1,3-cyclopentadiene (5-Methyl-1,3-cyclopentadiene), which is a cyclic diene with five carbon atoms, one of which is connected to a methyl (-CH3) group, and the maleic anhydride refers to maleic anhydride, which is a colorless solid with a pungent odor and has a chemical formula of C4H2O3.

[0079] The present invention analyzes the molar ratio of the methylcyclopentadiene and maleic anhydride to optimize the reaction conditions and improve the reaction yield.

[0080] In detail, the analysis of the molar ratio of the methylcyclopentadiene and maleic anhydride comprises:

[0081] Determine the reaction principle of the methylcyclopentadiene and maleic anhydride;

[0082] Based on the reaction principle, the stoichiometric coefficients of the methylcyclopentadiene and maleic anhydride are analyzed;

[0083] Analyze the side reactions and reaction influencing factors of the methylcyclopentadiene and maleic anhydride;

[0084] constructing a molar ratio control group of the methylcyclopentadiene and maleic anhydride according to the stoichiometric coefficient, the side reaction, and the reaction influencing factor;

[0085] The product distribution of the molar ratio control group was analyzed to determine the molar ratio of the methylcyclopentadiene to maleic anhydride.

[0086] The reaction principle refers to the principle of the DielsAlder reaction between methylcyclopentadiene and maleic anhydride. Specifically, it is the mechanism of the [4+2] cycloaddition reaction, in which a conjugated diene (methylcyclopentadiene) reacts with a dienophile (maleic anhydride) to generate a six-membered ring addition product. The stoichiometric coefficient refers to the ratio of the reaction of methylcyclopentadiene and maleic anhydride. The side reaction refers to other reactions that may occur during the reaction of methylcyclopentadiene and maleic anhydride in addition to the main reaction (DielsAlder reaction), such as dimerization of maleic anhydride, polymerization of methylcyclopentadiene, etc. The reaction influencing factor refers to the reaction factor that affects the methylcyclopentadiene. Factors affecting the reaction rate, selectivity and yield of methylcyclopentadiene and maleic anhydride include temperature, catalyst and other factors. The product distribution refers to the state of the final product produced by different molar ratio control groups. The molar ratio control group refers to the combination of different molar ratios (for example, 1:1, 1.1:1, 1:1.1, 1.2:1, 1:1.2, etc.) under the same reaction conditions (such as temperature, solvent, catalyst, reaction time) in order to determine the optimal molar ratio. The molar ratio refers to the ratio of the amounts of methylcyclopentadiene and maleic anhydride in the reaction. In the present invention, the molar ratio is 1:1.1.

[0087] It should be explained that the target amount of methylcyclopentadiene refers to the amount of methylcyclopentadiene actually used in the reaction, and the target amount of maleic anhydride refers to the amount of maleic anhydride actually used in the reaction. For example, if the target amount of methylcyclopentadiene = 0.1 mol, then the target amount of maleic anhydride = 0.1 mol*1.1 = 0.11 mol.

[0088] S2. Dehydrating the target amount of methylcyclopentadiene by molecular sieve to obtain dehydrated methylcyclopentadiene, and filtering the target amount of maleic anhydride to obtain filtered maleic anhydride.

[0089] The present invention performs molecular sieve dehydration on the target amount of methylcyclopentadiene to obtain a dehydrated amount of methylcyclopentadiene, which provides a purer reactant for the subsequent reaction with maleic anhydride, thereby potentially improving the reaction efficiency and product yield.

[0090] In detail, the molecular sieve dehydration of the target amount of methylcyclopentadiene to obtain the dehydrated amount of methylcyclopentadiene comprises:

[0091] Determine the molecular sieve of the target amount of methylcyclopentadiene;

[0092] activating the molecular sieve to obtain an activated molecular sieve;

[0093] mixing the activated molecular sieve and the target amount of methylcyclopentadiene to obtain mixed methylcyclopentadiene;

[0094] Calculating the molecular sieve uniformity coefficient of the mixed methylcyclopentadiene;

[0095] According to the molecular sieve uniformity coefficient, the target amount of methylcyclopentadiene in the mixed methylcyclopentadiene is dehydrated to obtain the dehydrated amount of methylcyclopentadiene.

[0096] Among them, the molecular sieve refers to a pre-prepared adsorbent for adsorbing moisture, the activated molecular sieve refers to a molecular sieve with high adsorption activity after being treated in high temperature vacuum or inert atmosphere to remove adsorbed impurities (mainly water), the mixed methylcyclopentadiene refers to a system formed by physically mixing the activated molecular sieve and the target amount of methylcyclopentadiene, the molecular sieve uniformity coefficient refers to a relative indicator describing the uniformity of molecular sieve distribution in the mixture, and is used to evaluate whether the mixing effect meets the dehydration requirements, and the dehydrated methylcyclopentadiene refers to methylcyclopentadiene with significantly reduced moisture content after molecular sieve adsorption treatment.

[0097] Alternatively, the activation of the molecular sieve to obtain the activated molecular sieve can be carried out in a tube furnace or oven, and heated to a specific temperature (for example, for Molecular sieve, usually at 300-350 ° C) and maintain for a period of time (such as 4-6 hours).

[0098] The present invention filters the target amount of maleic anhydride to obtain filtered maleic anhydride, which can effectively filter the target amount of maleic anhydride, remove solid impurities therein, and ensure the smooth progress of subsequent reactions. The filtered maleic anhydride refers to maleic anhydride after impurities in the target amount of maleic anhydride are removed.

[0099] S3, establishing a three-stage Diels Alder reactor for the dehydrated methylcyclopentadiene and the filtered maleic anhydride, and preheating and mixing the dehydrated methylcyclopentadiene and the filtered maleic anhydride based on the first stage of the three-stage Diels Alder reactor to obtain a mixed reactant.

[0100] The present invention establishes a three-stage DielsAlder reactor for dehydrating methylcyclopentadiene and filtering maleic anhydride, and can improve the reaction effect of the dehydrating methylcyclopentadiene and the filtering maleic anhydride through partition reaction.

[0101] In detail, the three-stage DielsAlder reactor for dehydrating methylcyclopentadiene and filtering maleic anhydride comprises:

[0102] defining reactor specifications for the dehydration amount of methylcyclopentadiene and the filtration of maleic anhydride;

[0103] Based on the reactor index, a three-level partition structure of the dehydrated methylcyclopentadiene and the filtered maleic anhydride is established;

[0104] By means of the three-level partition structure, a three-level functional zone for dehydrating methylcyclopentadiene and filtering maleic anhydride is established;

[0105] defining pipeline connections for the three-level functional areas;

[0106] Analyze the linkage synergy coefficient of the three-level functional areas;

[0107] Combining the pipeline connection and the linkage synergy coefficient, a three-stage DielsAlder reactor of the three-stage functional zone is constructed.

[0108] Among them, the reactor index refers to the key parameters used to describe and evaluate the performance and status of the DielsAlder reactor, the three-level partition structure refers to the structure of the entire reactor system (or its core part) divided into three main functional areas according to different stages of the reaction process, different operating conditions or functional requirements, the three-level functional area refers to the functional area established according to the three-level partition structure, the pipeline connection refers to the description of the path of material and energy transfer between each three-level functional area, and between the functional area and the outside (such as raw material storage tanks, product collection tanks, public works such as cooling water, heating medium), the linkage synergy coefficient refers to the indicator for controlling the coordinated work of each three-level functional area, and the three-level DielsAlder reactor refers to a complete system that ultimately integrates all the above elements (hardware, partitions, functions, connections, controls) for continuous or semi-continuous dehydration of methylcyclopentadiene and filtration of maleic anhydride DielsAlder reaction.

[0109] Furthermore, the analysis of the linkage synergy coefficient of the three-level functional areas includes:

[0110] simulating the reaction of the three-level functional area to obtain reaction data;

[0111] Based on the reaction data, determining the primary outlet temperature, the secondary inlet set temperature, the secondary outlet residual concentration, and the real-time catalytic efficiency of the Hβ molecular sieve of the three-stage functional zone;

[0112] According to the first-level outlet temperature and the second-level inlet set temperature, the first-level-secondary linkage coefficient of the three-level functional zone is calculated using the following formula:

[0113]

[0114] Among them, CC 12 represents the first-level-second-level linkage coefficient of the functional zone, θ represents the temperature term weight coefficient, and e represents the exponential function. represents the temperature sensitivity coefficient, T1 represents the first-stage outlet temperature, T 2,in represents the secondary inlet set temperature, ρ represents the flow term weight coefficient, Q ideal represents the ideal mass flow ratio, Q actual Indicates the actual mass flow rate;

[0115] Calculating the secondary-tertiary linkage coefficient of the tertiary functional zone according to the secondary outlet residual concentration and the real-time catalytic efficiency of the Hβ molecular sieve;

[0116] Based on the first-level-second-level linkage coefficient and the second-level-third-level linkage coefficient, the linkage synergy coefficient of the third-level functional area is analyzed.

[0117] Wherein, the reaction data refers to various parameters output after simulating the three-stage DielsAlder reactor (including its three functional zones) through computer simulation software (such as Aspen Plus, COMSOL, MATLAB / Simulink, etc.), the first-stage outlet temperature refers to the temperature at which the material leaves the first-stage functional zone, the second-stage inlet set temperature refers to the target temperature set for the material at the inlet of the second-stage functional zone, the second-stage outlet residual concentration refers to the concentration of unreacted specific key components (for example, unreacted maleic anhydride or first-stage product) when the material leaves the second-stage functional zone, the real-time catalytic efficiency of the Hβ molecular sieve refers to the catalytic activity actually exhibited when the Hβ molecular sieve is used as a catalyst in the second-stage (or third-stage, depending on the design) functional zone, and the first-stage-secondary The linkage coefficient refers to the degree of matching between the outlet state (temperature) of the first-stage reactor and the target state (temperature) of the inlet of the second-stage reactor. The secondary-tertiary linkage coefficient refers to the degree of matching between the outlet state (residual concentration, catalyst efficiency) of the second-stage reactor and the input requirement of the third-stage reactor (or subsequent treatment). The temperature item weight coefficient refers to the parameter for adjusting the influence of the temperature factor on the primary-secondary linkage coefficient, which can be 0.6 in the present invention. The flow item weight coefficient refers to the parameter for adjusting the influence of the flow factor on the primary-secondary linkage coefficient, which can be 0.05 in the present invention. The temperature sensitivity coefficient refers to the quantification of the sensitivity of the reaction to temperature changes, which can be 0.35 in the present invention.

[0118] Furthermore, the calculation of the secondary-tertiary linkage coefficient of the tertiary functional zone by the secondary outlet residual concentration and the real-time catalytic efficiency of the Hβ molecular sieve includes:

[0119] Identify the initial catalytic efficiency and sensitivity coefficient of the Hβ molecular sieve in the tertiary functional zone;

[0120] The secondary-tertiary linkage coefficient of the tertiary functional zone is calculated using the following formula based on the initial catalytic efficiency of the Hβ molecular sieve, the sensitivity coefficient, the secondary outlet residual concentration, and the real-time catalytic efficiency of the Hβ molecular sieve:

[0121]

[0122] Among them, CC 23 represents the secondary-tertiary linkage coefficient of the third-level functional area, β represents the sensitivity coefficient, [MCPD] residual Represents the residual concentration at the secondary outlet, R cat represents the real-time catalytic efficiency of Hβ molecular sieve, Q act,0 It represents the initial catalytic efficiency of Hβ molecular sieve.

[0123] The sensitivity coefficient refers to the sensitivity coefficient quantifying the influence of the residual MCPD concentration at the secondary outlet on the linkage coefficient, and the initial catalytic efficiency of the Hβ molecular sieve refers to the MCPD conversion capacity of the Hβ molecular sieve per unit time in a brand new state.

[0124] The present invention is based on the preheating and mixing of the dehydrated methylcyclopentadiene and the filtered maleic anhydride in the first stage of the three-stage Diels-Alder reactor to obtain a mixed reactant, which can accurately and efficiently prepare a uniform initial mixed reactant in the first stage of the three-stage Diels-Alder reactor. The mixed reactant refers to a uniform mixture obtained after the dehydrated methylcyclopentadiene and the filtered maleic anhydride undergo the preheating and mixing steps. The first stage refers to the first reactor of the three-stage Diels-Alder reactor, which is used for preheating and mixing.

[0125] S4. Using the second stage of the three-stage DielsAlder reactor to perform a catalytic reaction on the mixed reactants to obtain a catalytic reaction compound, and using the third stage of the three-stage DielsAlder reactor to perform ionic liquid catalytic enhancement on the catalytic reaction compound to obtain an enhanced reaction compound.

[0126] The present invention utilizes the second stage of the three-stage DielsAlder reactor to carry out a catalytic reaction on the mixed reactants to obtain catalytic reaction compounds, which can convert the initial mixed reactants into a catalytic reaction compound mixture containing the target DielsAlder product.

[0127] In detail, the method of using the second stage of the three-stage DielsAlder reactor to catalyze the mixed reactants to obtain a catalytic reaction compound includes:

[0128] determining mixed reactant parameters of the mixed reactant;

[0129] configuring the flow rate of the mixed reactant parameter input to the second stage;

[0130] Based on the flow rate, inputting the mixed reactant parameters into the second stage to obtain a second-stage mixed reactant;

[0131] Determining the bed state of the Hβ molecular sieve catalyst corresponding to the second-stage mixed reactants;

[0132] configuring a reaction temperature gradient for the second-stage mixed reactant;

[0133] Based on the bed state, the reaction temperature gradient and the Hβ molecular sieve catalyst, the second-stage mixed reactants are subjected to a catalytic reaction to obtain a catalytic reaction compound.

[0134] The second stage refers to the middle reactor of the three-stage DielsAlder reactor, which carries out the catalytic reaction. The mixed reactant parameters refer to the key physical and chemical properties and composition information describing the mixed reactants (a mixture of dehydrated methylcyclopentadiene and filtered maleic anhydride) before entering the second-stage reactor, such as parameters such as composition, temperature, and pressure. The flow rate refers to the amount of mixed reactants entering the second-stage reactor per unit time. The second-stage mixed reactants refer to the material state with the above parameters formed at the reactor inlet and initial section after entering the second-stage reactor. The Hβ molecular sieve catalyst refers to a specific catalyst filled in the second-stage reactor for catalyzing the DielsAlder reaction. The bed state refers to the physical and chemical state of the catalyst bed during the reaction. The reaction temperature gradient refers to the gradually changing temperature distribution set along the flow direction of the reactants from the inlet to the outlet in the second-stage reactor. The catalytic reaction compound refers to the new chemical substance generated by the reaction.

[0135] Alternatively, the determination of the Hβ molecular sieve catalyst bed state corresponding to the second-stage mixed reactants can be performed by using online gas chromatography (GC) or mass spectrometry (MS) analysis techniques to monitor the composition of the reactor outlet gas in real time. By analyzing the concentration changes of products and by-products, the activity and selectivity of the catalyst can be inferred.

[0136] See Figure 2 Figure 2 shows a schematic diagram of the reaction temperature gradient for the continuous production method of methyltetrahydrophthalic anhydride according to one embodiment of the present invention. Here, the 60°C feed: At the start of the reaction, the mixed reactants enter the system at 60°C. Preheating: 60°C → 80°C: The mixed reactants first undergo a preheating phase, raising their temperature from 60°C to 80°C. This step ensures that the mixed reactants reach an appropriate temperature before entering the constant temperature reaction phase, promoting smooth reaction progress. Constant temperature reaction: 90°C: After preheating, the mixed reactants enter the constant temperature reaction phase, maintaining a constant temperature of 90°C. This is the primary reaction phase, where the mixed reactants fully contact and undergo chemical reactions. Cooling: 85°C → 70°C: After the reaction is complete, the mixed reactants enter a cooling phase, gradually decreasing their temperature from 85°C to 70°C. This step helps slow the reaction rate, prevent overreaction or side reactions, and prepare for subsequent processing. Output to the third stage: The cooled mixed reactants are transported to the next-stage processing unit for further processing or separation.

[0137] The present invention utilizes the third stage of the three-stage DielsAlder reactor to perform ionic liquid catalytic enhancement on the catalytic reaction compound to obtain an enhanced reaction compound, and further catalytically converts the product mixture from the second stage, aiming to optimize the quality and yield of the final product.

[0138] In detail, the method of using the third stage of the three-stage DielsAlder reactor to perform ionic liquid catalytic enhancement on the catalytic reaction compound to obtain the enhanced reaction compound includes:

[0139] Identifying an ionic liquid catalyst for the catalytic reaction compound;

[0140] configuring enhanced reaction parameters of the catalytic reaction compound in the third stage;

[0141] Based on the enhanced reaction parameters, using the ionic liquid catalyst to perform ionic liquid catalytic enhancement on the catalytic reaction compound to obtain an initial enhanced reaction compound;

[0142] collecting key reaction parameters of the initial reinforcement reaction compound to analyze reinforcement deviation of the initial reinforcement reaction compound;

[0143] According to the reinforcement deviation, the reinforcement reaction parameters are optimized to obtain optimized reinforcement reaction parameters, so as to perform reinforcement optimization of the initial reinforcement reaction compound to obtain the reinforcement reaction compound.

[0144] Wherein, the ionic liquid catalyst refers to a specific ionic liquid used to catalyze or enhance the catalytic reaction compound in the third-stage reactor, the third stage refers to the last reactor unit in the three-stage Diels Alder reactor system, which is specially designed for ionic liquid catalytic enhancement, the enhanced reaction parameters refer to the operating conditions set in the third-stage reactor to achieve the ionic liquid catalytic enhancement effect. The enhanced reaction parameters include but are not limited to parameters such as temperature, pressure, and material rate. The initial enhanced reaction compound refers to the product mixture obtained after the ionic liquid catalytic enhancement treatment in the third-stage reactor under the set initial enhanced reaction parameters. The key reaction parameters refer to key indicators used to evaluate the performance and quality of the initial enhanced reaction compound, such as the target product yield, conversion rate, etc. The enhanced deviation refers to the difference or gap between the actual performance of the initial enhanced reaction compound (measured by the key parameters) and the preset target or ideal state. The optimized enhanced reaction parameters refer to a new set of operating conditions that can more effectively achieve the catalytic enhancement target after adjustment (for example, changing temperature, pressure, flow rate, IL dosage, etc.) based on the enhanced deviation obtained by analysis. The enhanced reaction compound refers to the product mixture finally obtained after the ionic liquid catalytic enhancement treatment in the third-stage reactor after applying the optimized enhanced reaction parameters.

[0145] Optionally, the key reaction parameters of the initial enhanced reaction compound are collected to analyze the enhanced deviation of the initial enhanced reaction compound using an online analytical instrument or offline sampling analysis. Specifically, the enhanced deviation can be determined by the difference or gap between the actual performance of the initial enhanced reaction compound (as measured by the key parameters) and a preset target or ideal state. For example, if the target yield is 95%, but the actual yield is only 92%, then the enhanced deviation in yield is 3%.

[0146] S5. Record the infrared spectrum of the enhanced reaction compound to calculate the MCPD conversion rate of the enhanced reaction compound. Desolventize the enhanced reaction compound according to the MCPD conversion rate to obtain methyltetrahydrophthalic anhydride. Isomerize the methyltetrahydrophthalic anhydride to obtain target methyltetrahydrophthalic anhydride.

[0147] It should be noted that the infrared spectrum refers to a spectrum obtained by testing the enhanced reaction compound using an infrared spectrometer, and the MCPD conversion rate refers to the percentage of methylcyclopentadiene (MCPD) converted to the target product during the enhanced reaction. Specifically, the MCPD conversion rate can be obtained by identifying characteristic peaks in the infrared spectrum and conducting comparative analysis.

[0148] According to the present invention, desolventizing the enhanced reaction compound based on the MCPD conversion rate to obtain methyltetrahydrophthalic anhydride can remove the solvent in the reaction mixture, thereby preliminarily separating or enriching the target product methyltetrahydrophthalic anhydride. Wherein, the methyltetrahydrophthalic anhydride is an organic compound belonging to the acid anhydride class.

[0149] The present invention isomerizes the methyltetrahydrophthalic anhydride to obtain target methyltetrahydrophthalic anhydride and improves the purity of the methyltetrahydrophthalic anhydride.

[0150] In detail, the isomerization of the methyltetrahydrophthalic anhydride to obtain the target methyltetrahydrophthalic anhydride comprises:

[0151] Analyzing the purity of the methyltetrahydrophthalic anhydride;

[0152] Determining the isomerization catalyst of the methyltetrahydrophthalic anhydride according to the purity;

[0153] Configuring the isomerization reaction conditions of the methyltetrahydrophthalic anhydride;

[0154] isomerize the methyltetrahydrophthalic anhydride based on the isomerization reaction conditions and the isomerization catalyst to obtain an isomerized reactant;

[0155] The isomeric reactants are separated to obtain the target methyltetrahydrophthalic anhydride.

[0156] The mass fraction of pure methyltetrahydrophthalic anhydride in the mixture is referred to as the mass fraction; the isomerization catalyst refers to a substance that can accelerate the rate of molecular structural change of methyltetrahydrophthalic anhydride (MeTHPA) (from a cyclohexene structure containing double bonds to a saturated cyclohexane structure, i.e., to methylhexahydrophthalic anhydride MeHHPA) while leaving its chemical properties substantially unchanged after the reaction; the isomerization reaction conditions refer to the specific operating parameters set to enable the isomerization reaction to proceed effectively, efficiently, and highly selectively; the isomerization reactants refer to the collective term for all substances removed from the reactor after the isomerization reaction is completed; and the target methyltetrahydrophthalic anhydride refers to the final methyltetrahydrophthalic anhydride obtained through the isomerization reaction and subsequent separation and purification steps and having a purity meeting the requirements.

[0157] Optionally, the isomerization reaction conditions for preparing the methyltetrahydrophthalic anhydride include temperature, pressure, reaction time, catalyst dosage and other conditions.

[0158] Optionally, the isomeric reactants are separated to obtain the target methyltetrahydrophthalic anhydride by distillation.

[0159] First, by accurately determining the molar ratio of the raw materials methylcyclopentadiene and maleic anhydride and configuring the target amount, the accuracy of the reactant ratio can be ensured, thereby improving the efficiency of the reaction and the yield of the product. Secondly, the methylcyclopentadiene is subjected to molecular sieve dehydration treatment to effectively remove the water therein, avoiding the adverse effect of water on the reaction, and improving the purity of the raw materials and the stability of the reaction. At the same time, the maleic anhydride is filtered to remove impurities therein, further optimizing the utilization rate of the raw materials, reducing waste, and lowering production costs. During the reaction process, a three-stage DielsAlder reactor is established, and the reaction is divided into three stages: preheating mixing, catalytic reaction, and ionic liquid catalytic enhancement, thereby realizing segmented control and optimization of the reaction process. This multi-stage reactor design can significantly improve High reaction efficiency, reduced side reactions, thereby improving the yield and purity of the target product. The first stage of the three-stage Diels Alder reactor is used to preheat and mix the dehydrated methylcyclopentadiene and filtered maleic anhydride to obtain a mixed reactant, which provides good initial conditions for subsequent reactions. In the second and third stage reactions, the mixed reactant is subjected to a catalytic reaction and ionic liquid catalytic enhancement, respectively, further improving the selectivity and efficiency of the reaction. By recording the infrared spectrum of the enhanced reaction compound and calculating the MCPD conversion rate, the reaction progress can be monitored in real time, and the reaction conditions can be accurately controlled. According to the MCPD conversion rate, the enhanced reaction compound is desolvated to obtain methyltetrahydrophthalic anhydride, and then through an isomerization reaction, the target methyltetrahydrophthalic anhydride is finally obtained. Therefore, the present invention can improve the preparation efficiency of methyltetrahydrophthalic anhydride.

[0160] Example 2:

[0161] like Figure 3 FIG. 1 is a functional module diagram of a continuous production system for methyltetrahydrophthalic anhydride according to the present invention.

[0162] The continuous production system 300 of methyltetrahydrophthalic anhydride described in the present invention can be installed in an electronic device. Depending on the functionality to be implemented, the system can include a raw material determination module 301, a raw material pretreatment module 302, a reactor construction module 303, a reactor reaction module 304, and a methyltetrahydrophthalic anhydride generation module 305. A module, also referred to as a unit, is a series of computer program segments that can be executed by an electronic device processor and perform a fixed function, and is stored in the electronic device's memory.

[0163] In the embodiment of the present invention, the functions of each module / unit are as follows:

[0164] The raw material determination module 301 is used to determine raw materials, wherein the raw materials include methylcyclopentadiene and maleic anhydride, analyze the molar ratio of the methylcyclopentadiene and maleic anhydride, and configure the target amounts of the methylcyclopentadiene and maleic anhydride according to the molar ratio;

[0165] The raw material pretreatment module 302 is used to perform molecular sieve dehydration on the target amount of methylcyclopentadiene to obtain dehydrated methylcyclopentadiene, and filter the target amount of maleic anhydride to obtain filtered maleic anhydride;

[0166] The reactor construction module 303 is used to establish a three-stage Diels Alder reactor for the dehydrated methylcyclopentadiene and the filtered maleic anhydride, and preheat and mix the dehydrated methylcyclopentadiene and the filtered maleic anhydride based on the first stage of the three-stage Diels Alder reactor to obtain a mixed reactant;

[0167] The reactor reaction module 304 is configured to perform a catalytic reaction on the mixed reactants using the second stage of the three-stage DielsAlder reactor to obtain a catalytic reaction compound, and perform ionic liquid catalytic enhancement on the catalytic reaction compound using the third stage of the three-stage DielsAlder reactor to obtain an enhanced reaction compound;

[0168] The methyltetrahydrophthalic anhydride generation module 305 is used to record the infrared spectrum of the enhanced reaction compound to calculate the MCPD conversion rate of the enhanced reaction compound, desolventize the enhanced reaction compound based on the MCPD conversion rate to obtain methyltetrahydrophthalic anhydride, and isomerize the methyltetrahydrophthalic anhydride to obtain the target methyltetrahydrophthalic anhydride.

[0169] In detail, the modules in the methyltetrahydrophthalic anhydride continuous production system 300 according to the embodiment of the present invention are used in the same manner as above. Figure 1 The same technical means as the continuous production and preparation method of methyltetrahydrophthalic anhydride described in and can produce the same technical effects are used, and will not be repeated here.

[0170] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention.

[0171] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A method for continuously producing methyltetrahydrophthalic anhydride, characterized in that: The method comprises: Determining raw materials, wherein the raw materials include methylcyclopentadiene and maleic anhydride, analyzing a molar ratio of the methylcyclopentadiene and the maleic anhydride, and configuring target amounts of the methylcyclopentadiene and the maleic anhydride based on the molar ratio; Dehydrating the target amount of methylcyclopentadiene by molecular sieve to obtain dehydrated methylcyclopentadiene, and filtering the target amount of maleic anhydride to obtain filtered maleic anhydride; Establishing a three-stage Diels Alder reactor for the dehydrated methylcyclopentadiene and the filtered maleic anhydride, and preheating and mixing the dehydrated methylcyclopentadiene and the filtered maleic anhydride based on the first stage of the three-stage Diels Alder reactor to obtain a mixed reactant; catalyzing the mixed reactants using the second stage of the three-stage DielsAlder reactor to obtain a catalytic reaction compound, and enhancing the catalytic reaction compound with an ionic liquid using the third stage of the three-stage DielsAlder reactor to obtain an enhanced reaction compound; The infrared spectrum of the enhanced reaction compound is recorded to calculate the MCPD conversion rate of the enhanced reaction compound. According to the MCPD conversion rate, the enhanced reaction compound is desolvated to obtain methyltetrahydrophthalic anhydride, and the methyltetrahydrophthalic anhydride is isomerized to obtain the target methyltetrahydrophthalic anhydride.

2. The continuous production method for preparing methyltetrahydrophthalic anhydride according to claim 1, wherein The analysis of the molar ratio of the methylcyclopentadiene and maleic anhydride comprises: Determine the reaction principle of the methylcyclopentadiene and maleic anhydride; Based on the reaction principle, the stoichiometric coefficients of the methylcyclopentadiene and maleic anhydride are analyzed; Analyze the side reactions and reaction influencing factors of the methylcyclopentadiene and maleic anhydride; constructing a molar ratio control group of the methylcyclopentadiene and maleic anhydride according to the stoichiometric coefficient, the side reaction, and the reaction influencing factor; The product distribution of the molar ratio control group was analyzed to determine the molar ratio of the methylcyclopentadiene to maleic anhydride.

3. The continuous production method for preparing methyltetrahydrophthalic anhydride according to claim 2, wherein The step of subjecting the target amount of methylcyclopentadiene to molecular sieve dehydration to obtain the dehydrated amount of methylcyclopentadiene comprises: Determine the molecular sieve of the target amount of methylcyclopentadiene; activating the molecular sieve to obtain an activated molecular sieve; mixing the activated molecular sieve and the target amount of methylcyclopentadiene to obtain mixed methylcyclopentadiene; Calculating the molecular sieve uniformity coefficient of the mixed methylcyclopentadiene; According to the molecular sieve uniformity coefficient, the target amount of methylcyclopentadiene in the mixed methylcyclopentadiene is dehydrated to obtain the dehydrated amount of methylcyclopentadiene.

4. The continuous production method for preparing methyltetrahydrophthalic anhydride according to claim 3, wherein The three-stage DielsAlder reactor for establishing the dehydration amount of methylcyclopentadiene and the filtering of maleic anhydride comprises: defining reactor specifications for the dehydration amount of methylcyclopentadiene and the filtration of maleic anhydride; Based on the reactor index, a three-level partition structure of the dehydrated methylcyclopentadiene and the filtered maleic anhydride is established; By means of the three-level partition structure, a three-level functional zone for dehydrating methylcyclopentadiene and filtering maleic anhydride is established; defining pipeline connections for the three-level functional areas; Analyze the linkage synergy coefficient of the three-level functional areas; Combining the pipeline connection and the linkage synergy coefficient, a three-stage DielsAlder reactor of the three-stage functional zone is constructed.

5. The continuous production method for preparing methyltetrahydrophthalic anhydride according to claim 4, wherein The analysis of the linkage synergy coefficient of the three-level functional areas includes: simulating the reaction of the three-level functional area to obtain reaction data; Based on the reaction data, determining the primary outlet temperature, the secondary inlet set temperature, the secondary outlet residual concentration, and the real-time catalytic efficiency of the Hβ molecular sieve of the three-stage functional zone; According to the first-level outlet temperature and the second-level inlet set temperature, the first-level-secondary linkage coefficient of the three-level functional zone is calculated using the following formula: Among them, CC 12 represents the first-level-second-level linkage coefficient of the functional zone, θ represents the temperature term weight coefficient, and e represents the exponential function. represents the temperature sensitivity coefficient, T1 represents the first-stage outlet temperature, T 2,in represents the secondary inlet set temperature, ρ represents the flow term weight coefficient, Q ideal represents the ideal mass flow ratio, Q actual Indicates the actual mass flow rate; Calculating the secondary-tertiary linkage coefficient of the tertiary functional zone according to the secondary outlet residual concentration and the real-time catalytic efficiency of the Hβ molecular sieve; Based on the first-level-second-level linkage coefficient and the second-level-third-level linkage coefficient, the linkage synergy coefficient of the third-level functional area is analyzed.

6. The continuous production method for preparing methyltetrahydrophthalic anhydride according to claim 5, wherein: The calculation of the secondary-tertiary linkage coefficient of the tertiary functional zone by the secondary outlet residual concentration and the real-time catalytic efficiency of the Hβ molecular sieve includes: Identify the initial catalytic efficiency and sensitivity coefficient of the Hβ molecular sieve in the tertiary functional zone; The secondary-tertiary linkage coefficient of the tertiary functional zone is calculated using the following formula based on the initial catalytic efficiency of the Hβ molecular sieve, the sensitivity coefficient, the secondary outlet residual concentration, and the real-time catalytic efficiency of the Hβ molecular sieve: Among them, CC 23 represents the secondary-tertiary linkage coefficient of the third-level functional area, β represents the sensitivity coefficient, [MCPD] residual Represents the residual concentration at the secondary outlet, R cat represents the real-time catalytic efficiency of Hβ molecular sieve, Q act,0 It represents the initial catalytic efficiency of Hβ molecular sieve.

7. The continuous production method for preparing methyltetrahydrophthalic anhydride according to claim 6, wherein: The method of using the second stage of the three-stage DielsAlder reactor to catalyze the mixed reactants to obtain a catalytic reaction compound comprises: determining mixed reactant parameters of the mixed reactant; configuring the flow rate of the mixed reactant parameter input to the second stage; Based on the flow rate, inputting the mixed reactant parameters into the second stage to obtain a second-stage mixed reactant; Determining the bed state of the Hβ molecular sieve catalyst corresponding to the second-stage mixed reactants; configuring a reaction temperature gradient for the second-stage mixed reactant; Based on the bed state, the reaction temperature gradient and the Hβ molecular sieve catalyst, the second-stage mixed reactants are subjected to a catalytic reaction to obtain a catalytic reaction compound.

8. The continuous production method for preparing methyltetrahydrophthalic anhydride according to claim 7, wherein: The method of utilizing the third stage of the three-stage DielsAlder reactor to perform ionic liquid catalytic enhancement on the catalytic reaction compound to obtain the enhanced reaction compound comprises: Identifying an ionic liquid catalyst for the catalytic reaction compound; configuring enhanced reaction parameters of the catalytic reaction compound in the third stage; Based on the enhanced reaction parameters, using the ionic liquid catalyst to perform ionic liquid catalytic enhancement on the catalytic reaction compound to obtain an initial enhanced reaction compound; collecting key reaction parameters of the initial reinforcement reaction compound to analyze reinforcement deviation of the initial reinforcement reaction compound; According to the reinforcement deviation, the reinforcement reaction parameters are optimized to obtain optimized reinforcement reaction parameters, so as to perform reinforcement optimization of the initial reinforcement reaction compound to obtain the reinforcement reaction compound.

9. The continuous production method for preparing methyltetrahydrophthalic anhydride according to claim 8, wherein The isomerization of the methyltetrahydrophthalic anhydride to obtain the target methyltetrahydrophthalic anhydride comprises: Analyzing the purity of the methyltetrahydrophthalic anhydride; Determining the isomerization catalyst of the methyltetrahydrophthalic anhydride according to the purity; Configuring the isomerization reaction conditions of the methyltetrahydrophthalic anhydride; isomerize the methyltetrahydrophthalic anhydride based on the isomerization reaction conditions and the isomerization catalyst to obtain an isomerized reactant; The isomeric reactants are separated to obtain the target methyltetrahydrophthalic anhydride.

10. A continuous production system for methyltetrahydrophthalic anhydride, characterized in that: The system comprises: a raw material determination module, configured to determine raw materials, wherein the raw materials include methylcyclopentadiene and maleic anhydride, analyze the molar ratio of the methylcyclopentadiene and maleic anhydride, and configure target amounts of the methylcyclopentadiene and maleic anhydride based on the molar ratio; a raw material pretreatment module, configured to perform molecular sieve dehydration on the target amount of methylcyclopentadiene to obtain dehydrated methylcyclopentadiene, and filter the target amount of maleic anhydride to obtain filtered maleic anhydride; A reactor construction module is used to establish a three-stage DielsAlder reactor for the dehydrated methylcyclopentadiene and the filtered maleic anhydride, and preheat and mix the dehydrated methylcyclopentadiene and the filtered maleic anhydride based on the first stage of the three-stage DielsAlder reactor to obtain a mixed reactant; a reactor reaction module, configured to perform a catalytic reaction on the mixed reactants using the second stage of the three-stage DielsAlder reactor to obtain a catalytic reaction compound, and perform ionic liquid catalytic enhancement on the catalytic reaction compound using the third stage of the three-stage DielsAlder reactor to obtain an enhanced reaction compound; The methyltetrahydrophthalic anhydride generation module is used to record the infrared spectrum of the enhanced reaction compound to calculate the MCPD conversion rate of the enhanced reaction compound, desolventize the enhanced reaction compound according to the MCPD conversion rate to obtain methyltetrahydrophthalic anhydride, and isomerize the methyltetrahydrophthalic anhydride to obtain the target methyltetrahydrophthalic anhydride.

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