發(fā)布時(shí)間：2018-10-15 07:54

【摘要】：對(duì)苯二甲酸是生產(chǎn)聚酯的主要原料,聚酯工業(yè)的發(fā)展也促進(jìn)了對(duì)苯二甲酸工業(yè)的發(fā)展。本文以流程簡(jiǎn)單、生產(chǎn)高效且成本較低的EPTA工藝過(guò)程為研究對(duì)象,通過(guò)利用Aspen Plus模擬該工藝過(guò)程,對(duì)該過(guò)程進(jìn)行深入了解,并為實(shí)際生產(chǎn)提供參考。 本文綜述了對(duì)二甲苯氧化反應(yīng)機(jī)理及動(dòng)力學(xué)的研究進(jìn)展,在Aspen Plus中使用RCSTR模塊模擬氧化反應(yīng)器,基于對(duì)二甲苯氧化的雙曲型動(dòng)力學(xué)模型以及副反應(yīng)動(dòng)力學(xué)模型,并利用鹽沉降反應(yīng)模擬固體的溶解與析出平衡,完成了氧化反應(yīng)器的模擬,其模擬結(jié)果貼近實(shí)際生產(chǎn)結(jié)果。使用RadFrac模塊模擬本質(zhì)為精餾塔的脫水塔；使用RCSTR模塊模擬二次氧化反應(yīng)器(即一級(jí)結(jié)晶器),Crystallizer模塊模擬二級(jí)、三級(jí)結(jié)晶器,其中二次反應(yīng)器需考慮中間產(chǎn)物的二次氧化；使用Swash模塊模擬過(guò)濾器,Flash2模塊模擬干燥機(jī)。針對(duì)氧化單元考察了流程參數(shù)反應(yīng)溫度、停留時(shí)間、溶劑比以及空氣流量對(duì)氧化反應(yīng)的影響,并以醋酸單耗最低為目標(biāo)函數(shù)優(yōu)化參數(shù)。針對(duì)溶劑脫水單元,考察回流比、釜液采出率以及塔頂壓力變化對(duì)脫水塔脫水效果與能耗情況的影響,并以脫水塔塔頂冷凝器與塔底再沸器總能耗最低為目標(biāo)函數(shù)優(yōu)化參數(shù)。最后,在各單元分段模擬的基礎(chǔ)上,根據(jù)單元間的物流聯(lián)系,完成了EPTA工藝的全流程模擬,其模擬結(jié)果與分單元模擬時(shí)結(jié)果基本保持一致,可為工廠生產(chǎn)提供一定的參考。在全流程的基礎(chǔ)上提出了以一個(gè)最優(yōu)溫度壓力下操作的結(jié)晶器替換兩個(gè)絕熱結(jié)晶器,并省去了過(guò)濾干燥單元,降低了結(jié)晶器堵塞的風(fēng)險(xiǎn),大大節(jié)省了空間與裝置投入成本,以補(bǔ)充適當(dāng)熱量為代價(jià),提高了產(chǎn)品產(chǎn)量與質(zhì)量。
[Abstract]:Terephthalic acid is the main raw material for polyester production, and the development of polyester industry also promotes the development of terephthalic acid industry. In this paper, the EPTA process with simple process, high efficiency and low cost is taken as the research object. By using Aspen Plus to simulate the process, the process is deeply understood, and the reference is provided for practical production. In this paper, the mechanism and kinetics of p-xylene oxidation are reviewed. The RCSTR module is used to simulate the oxidation reactor in Aspen Plus, based on hyperbolic kinetic model and side reaction kinetic model of p-xylene oxidation. The solution and precipitation equilibrium of solid was simulated by salt settling reaction, and the oxidation reactor was simulated, and the simulation results were close to the actual production results. RadFrac module is used to simulate the dehydration tower which is essentially the distillation column, and the RCSTR module is used to simulate the secondary oxidation reactor (that is, the first stage mold), Crystallizer module simulates the secondary and tertiary crystallizer, in which the secondary reactor needs to consider the secondary oxidation of the intermediate product; Swash module is used to simulate filter and Flash2 module to simulate dryer. The effects of reaction temperature, residence time, solvent ratio and air flow rate on the oxidation reaction were investigated for the oxidation unit. The minimum acetic acid consumption was taken as the objective function to optimize the parameters. For solvent dehydration unit, the effects of reflux ratio, recovery rate of kettle liquid and pressure on dehydration efficiency and energy consumption of dehydration tower were investigated. The minimum total energy consumption of top condenser and bottom reboiler of dehydration tower was taken as the objective function to optimize the parameters. Finally, on the basis of each unit subsection simulation, according to the logistics relation between units, the whole process simulation of EPTA process is completed. The simulation results are basically consistent with the results of sub-unit simulation, which can provide a certain reference for the factory production. On the basis of the whole process, it is proposed to replace two adiabatic crystallizers with a mold operated under optimal temperature and pressure, and the filter drying unit is saved, the risk of mold clogging is reduced, and the cost of space and equipment investment is greatly saved. At the cost of replenishing proper heat, the output and quality of the product are improved.
【學(xué)位授予單位】：西南石油大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TQ245.12

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