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Body thermal polymerization of styrene industrial process modeling and simulation

Author: YeYue（YueSheng）
Tutor: FengLianFang
School: Zhejiang University
Course: Chemical Engineering
Keywords: Polystyrene Model Process Simulation Grade Transition
CLC: TQ325.2
Type: Master's thesis
Year: 2002
Downloads: 185
Quote: 3
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Abstract


Establish reflect the polymerization process mathematical model to accurately predict the characteristics of the polymer molecules. The key is to establish a reliable mathematical model of comprehensive quantitative description of the reaction system of physical and chemical processes, and derive the corresponding quality, energy and momentum balance equations. In-depth analysis of the general-purpose polystyrene (GPPS) and high impact polystyrene (HIPS) on the basis of the production process, using the mechanism analysis modeling its industrial polymerization process modeling. First analyzes the reactor mixed mode the the prepolymerized autoclave may assume full mixed flow reactor (CSTR), after the polycondensation reactor can be regarded as the series reactor CSTR and plug flow (PFR). The styrene body heat polymerization mechanism summarized the literature, three molecules trigger, taking into account the coupling and disproportionation termination of the solvent chain transfer mechanism model. The investigation of the microstructure on the use of the operating parameters of the plant was simulated and compared with the results of sample analysis, by a macroscopic amount of the conversion rate, average molecular weight, molecular weight distribution mechanism model selected, select the appropriate kinetic parameters. Aspects of the assessment, validation for the GPPS polymerization process, the use of plant data collected, the patent to provide analog data, material balance data, the calculated conversion rate and average molecular weight and distribution of its agreement. Also established a the HIPS polymerization process model, HIPS determination of kinetic parameters were discussed, proposed the idea to determine the kinetic parameters. Reflect the production of the actual model is not an end, it is important application of model analysis of existing conditions, analysis of the sensitivity of the operating parameters, optimization of operating parameters; expansion device development of new products, the transformation of the industrial production device, optimize the operation of the program; theory simulation, discussion and analysis of non-steady-state characteristics of the non-steady-state process to guide industrial production and ensuring grade transition process to work to reduce the transition material, and ultimately improve economic efficiency for the production of devices to exert the effects. The simulated industrial whole process of steady-state polymerization process, under steady-state conditions, the conversion rate, the average molecular weight and distribution of the sensitivity of the various operating parameters. Wherein each index to the reaction temperature on the maximum feed ratio of the second minimum, the influence of the feed flow. GPPS production program of the high molecular weight in the conditions of use of existing industrial equipment, feasibility studies, analysis of the sensitivity of the existing operating conditions and operating parameters to optimize the process parameters; and discusses the design conditions are met can achieve maximum production capacity and average molecular weight. New design of the reactor, the simulation calculation of the size of the equipment required to meet production requirements and the corresponding process conditions. The calculations show that the use of SIMULINK simulation model can simulate not only during the steady state operation, but also can be used to simulate the non-steady-state process. It simulates the open parking, load change, grade switching prepolymerized autoclave four production process of the non-steady-state transition behavior to obtain the conversion rate, the average molecular weight and molecular weight distribution index variation with time, the simulation results and industrial sampling and analysis data are in good agreement. Pre-polycondensation reactor grade transition process, the industrial switching program transition time than the patent to provide the program reduced by 23%. On this basis, according to the conversion rate, the molecular weight of the sensitivity of operating parameters grade transition strategy, in theory, simulation, discussion and analysis of non-steady-state process, the transition time than the patent Zhejiang University master's degree thesis to shorten the length by 81%, reducing the transition material, with significant economic benefits. Styrene polymerization process model established in order to further determine the the HIPS polymerization kinetics parameters, a comprehensive analysis of GPPS and HIPS grades within the scope of the whole process of handover optimization strategy as well as open parking optimization strategy a useful exploration; conversion rate, average molecular weight, melt index online state estimation model based on the optimal control strategy.

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CLC: > Industrial Technology > Chemical Industry > Synthetic resins and plastics industry > Polymer resin and plastic > Polystyrene and its copolymers
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