Process Research for the Production of Acrylic Acid via the Oxidative Reaction of Propylene
| Autor: | Chi-Yun Liu, 劉繼允 |
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| Rok vydání: | 2018 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 106 In this research, a packed-bed reactor with a specified temperature mode was used for the production of acrylic acid via the oxidation reaction of propylene. The plant-wide design undergoes a series of units, including oxidative reaction, quench, absorption, extraction, solvent separation and acid purification unit in an attempt to reach the goal of an annual yield of 50,000 tonnes acrylic acid with purity of 99.9 mol%. Sensitivity analysis was conducted by using Aspen Plus. This analysis gives the effects of reaction temperature on the selectivity, yield, conversion, acrylic acid and acetic acid flow rate, and reaction exothermicity as well. The results indicated that conversion and acrylic acid flow rate was at optimum and lesser oxidative reaction heat generated when performed within the temperature range of 310-350oC. Therefore, the temperature of the reactor outlet was set at 310oC (optimal rate of acrylic acid flow). Explosive limits of combustible hydrocarbons in the reactor were evaluated and an additional of 2,500 kmol/hr of nitrogen gas (an inert gas which does not involved in the reaction) was found as a necessity to add in the feed streams so as to ensure the reactor was operated in the safety margin. An overall of 8,061kW of energy was saved from the entire process by conducting heat exchange via the“HeatX” module in Aspen Plus. According to the calculation, the manufacturing cost of the whole plant was estimated at a cost of $100,687,193 per annual (depreciation excluded). In view of the enterprise economic benefit using Monte-Carlo simulation with MACRS depreciation method adopted, we found that the average net present value is US$40×106, the average rate of return on investment is 57%, and the average return period is 4.8 years, respectively. In this study, two kinds of software were used—Aspen Plus and Microsoft “visio.”The former was implemented for the process synthesis and design. The latter was utilized to draw the plant-wide process flow diagram. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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