The heat exchanger that requires the highest amount of steam is the No. Are you tired and can barely handle your assignment? Are you busy and do not have time to handle your assignment? 1 (benzene-toluene column) on the quantity of ethyl-benzene and styrene obtained at the bottom stream. (2013). The LLV Separator must operate at 5 °C of temperature, and at a pressure of 10 bar, in order to reduce losses of styrene and ethyl-benzene at the top stream of this equipment. Styrene is obtained at commercial scale through several production processes, and the most important are the following (Speight, 2002): Catalytic dehydrogenation of ethyl-benzene at high temperature (630 °C) using various metal oxides as catalysts, such as zinc, chromium or magnesium oxides coated on activated carbon, alumina or bauxite. Thermal Science, 15(1), 145-158. This model fits better the temperature and pressure ranges handled throughout the production process, and it’s also capable of predicting satisfactorily the most important thermodynamic variables of all the chemicals used according to the different existing phases. Additionally, it is taken into account some useful recommendations provided by the simulator itself (CHEMSTATIONS, 2002). (2002). Empresa Industrial Ceballos. 2 with a purity of about 99.6%, while near 0.72 kg/h of ethyl-benzene are recycled back to the production process. In this case, an increment of the column’s operating pressure will also increase the internal operating temperature of the column and the number of plates (stages) required to carry out the desired separation duty. Finally, considering the heat curve obtained for the heat exchanger No. According to this expression, the greater the value of the numerator (Q), the greater the result of the heat transfer area (A) (Cao, 2010). [ Links ], Chilev, C. & Simeonov, E. (2014). Styrene (C6H5CH=CH2; phenyl ethylene, vinyl benzene) is the common name given to the simplest and most important member of the unsaturated aromatic monomers family. It is not very difficult if you have an experience in Chemcad. & Subramaniam, B. All Rights Reserved. 4, with 4008.8 kg/h. Your email address will not be published. The simulation of the production process of styrene via catalytic dehydrogenation of ethyl-benzene is carried out by using the process simulator CHEMCAD® version 5.2.0, in order to determine the composition and mass flow-rate of each process involved in the production, as well as the main operating parameters of the equipment used. 1 is recovered in the top stream of this column. According to the results showed in Tables 7 and 8, near 99% of the styrene fed to the LLV Separator is recovered on its middle stream, while about 100% of the benzene and toluene fed to the Distillation Column No. Do you have responsibilities that may hinder you from turning in your assignment on time? The reacting gaseous mixture flows inside the tubes over the catalyst bed, while superheated steam is injected in the reactor’s shell to maintain the reaction temperature in the requested range (580 - 610 °C). 2 (Styrene Column) in a cylindrical, pressurized vessel (Streams Mixer), operating under isobaric conditions. PLACE THIS ORDER OR A SIMILAR ORDER WITH GRADE VALLEY TODAY AND GET AN AMAZING DISCOUNT, Your email address will not be published. In this case, the Figure 5a represents the existing relationship between the ethyl-benzene flow rates at the middle stream of the LLV separator versus the operating temperature. [ Links ], Forero, F. Pulido, A. y Cabrera, S. (2016). Simulation of the Styrene Production Process Via Catalytic Dehydrogenation Of Ethylbenzene Using CHEMCAD® Process Simulator. A Toolbox Using the Stochastic Optimization Algorithm MIPT and Chemcad for the Systematic Process Retrofit of Complex Chemical Processes. The amount of superheated steam to consume in the Steam Mixer should be enough to obtain a gaseous stream with a final water/ethyl-benzene molar ratio of approximately 14:1, prior to being fed to the Conversion Reactor (WVU, 2010). Recovered from http://www.che.cemr.wvu.edu/publications/projects At the reactor’s exit a hot gaseous mixture is obtained, which has a styrene mass composition of about 93 % (on dry basis). The entire mini-plant consists only of the reactor and one distillation column for separating the product styrene and recycling of the unconverted ethylbenzene. Revista Tecnura, 20(49), 29-44, doi: 10.14483/udistrital.jour.tecnura.2016.3.a02. ® version 7.8.0 was used to process the results obtained. A particular example of the aforementioned constitutes the multi-physics modeling and computational simulation of mass and momentum transfer phenomena in a process of osmotic evaporation by applying Comsol® and Matlab® software (Forero, Pulido & Cabrera, 2016). Design project using Chemcad 7 program doi: 10.14483/udistrital.jour.tecnura.2017.3.a01, Received: Houston, Texas: Chemstations Inc. Figure 5g shows the existing relationship between the ethyl-benzene flow rates at the top stream of the LLV separator versus the operating pressure. These tools can be used at all stages of process development, from conceptual design, through process operation and further optimization. Since pure styrene could polymerize spontaneously in presence of high temperature and high pressure (typically over 6 bar and 125 °C), it is necessary to carry out the distillation process at the lowest possible pressure. A gaseous mixture primarily composed by hydrogen, methane and ethylene (as well as minor amounts of water and styrene) is obtained at the top of the LLV Separator (light gaseous stream), while a liquid stream containing water and certain traces of styrene, benzene and ethylene is obtained at the bottom of this equipment (wastewater stream). Please, contact me as soon as possible. Docente de la Facultad de Ciencias Aplicadas a la Industria Universidad de Camagüey. [ Links ], Sarwar, A. (2010). This evaluation of variables had as objective to maximize the amount of final product (styrene). Required fields are marked *. A Novel Reverse Flow Strategy for Ethylbenzene Dehydrogenation in a Packed-Bed Reactor. Weinheim: WILEY-VCH Verlag GmbH & Co. KGaA. According to the heat curve obtained for the heat exchanger number 2 (Figure 4b), the process stream follows a lineal heating pattern (sensible heat) until reaching a point near 50% of the heat exchanger length, at which phase change occurs (vaporization). This is because this equipment accomplishes the pre-heating process of the liquid ethyl-benzene stream (10 000 kg/h) from ambient temperature (25 ºC) to a temperature near the evaporation point (136 ºC), which involves the demand of great amounts of this auxiliary service to meet this significant temperature increment (111 ºC). PLACE THIS ORDER OR A SIMILAR ORDER WITH USA ELITE WRITERS TODAY AND GET AN AMAZING DISCOUNT. To develop this research, there were two sensitivity studies accomplished in order to know which values must be applied to the key operating variables of two processes equipment (LLV Separator and Distillation Column No. Method: The simulation of the production process of styrene via catalytic dehydrogenation of ethyl-ben-zene is carried out by using the process simulator CHEMCAD® version 5.2.0, in order to determine the composition and mass flow-rate of each process involved in the production, as well as the main ope - rating parameters of the equipment used. Tecnura: Tecnología y Cultura Afirmando el Conocimiento, Vol. Therefore, a temperature increment of 20 °C will lead to approximately 15kg/h of styrene losses, while nearly 0.041 kg/h of ethyl-benzene will not be recycled back to the process. 1. Please, try to understand the attachments provided below. Several heat curves were obtained for each shell and tube heat exchanger used in the process employing the tool “Plot Heat Curve” contained within the CHEMCAD® simulator. It is a very important chemical and is mostly used to obtain daily-use plastic materials and items such as toys, jars, bottles, serving dishes, cups, corks, etc., as well as a foam precursor for insulation and cushioning operations. Around 9234.436 kg/h of styrene is obtained in the last distillation column with 99.6% purity. The heat exchanger number 1 requested the highest amount of steam (7 559.9 kg/h). Figure 5e presents the existing relationship between the ethyl-benzene flow rates at the middle stream of the LLV separator versus the operating pressure. This is because this equipment presents the condensation of the components in the reacting gaseous mixture from 260 °C to approximately 50 °C. USAEliteWriters: a professional writing service that provides original papers. The main idea from this project is solve for Task 2 ONLY to get the maximum production of Styrene from Ethylbenzene using Chemcad 7 program. (2010). 1 the ethyl-benzene stream is pre-heated without undergoing evaporation, and the gaseous stream obtained at the reactor’s exit is cooled in the heat exchanger No. 3 without condensation. 4 (Figure 4d), the previously cooled gaseous mixture follows a lineal cooling pattern until reaching 90% of the heat exchanger length; this is the moment when phase change (condensation) occurs. Uno de los simuladores de procesos más empleados en la actualidad es el CHEMCAD®, mediante el cual se pueden simular un gran número de procesos químicos y petroquímicos. Figure 5b indicates the existing relationship between the styrene flow rates at the middle stream of the LLV separator versus the operating temperature. Not starting everything from the beginning. Please, contact me as soon as possible. Simulation of Olive Pits Pyrolysis in a Rotary Kiln Plant. The reaction temperature must not be increased to a value higher than 610 °C since thermal decomposition of both ethyl-benzene and styrene would occur. The minimum requirement to be an essay writer with our essay writing service is to have a college diploma. CHEMCAD® simulator is primarily designed for the simulation of hydrocarbon treatment and polymer synthesis processes (CHEMSTATIONS, 2002). The simulation of the production process of styrene via catalytic dehydrogenation of ethyl-benzene is carried out by using the process simulator CHEMCAD® version 5.2.0, in order to determine the composition and mass flow-rate of each process involved in the production, as well as the main operating parameters of the equipment used. Common uses for process simulation are process mapping, design, and assessment, as well as cost analysis (Dimian & Bildea, 2008). 1 while a styrene-rich stream is obtained at the column’s bottom, which is sent to the Distillation Column No. Figure 6a represents the existing relationship between the ethyl-benzene flow rates the bottom stream of Distillation Column No. En la última columna de destilación se obtienen 9234.436 kg/h de estireno con un 99.6 % de pureza, siendo la principal impureza encontrada en esta corriente el agua, con 0.35% en masa. 2 by means of CHEMCAD® simulator. 2 with a purity of about 99.6%, and the water is the main impurity on it (~ 0.35 %). The ethyl-benzene catalytic dehydrogenation takes place in a vertical cylindrical shell and tube reactor (Catalytic Reactor), which operates isothermally. ); and to graphically evaluate the heat transfer processes carried out at the heat exchangers. Figure 5 Results obtained in the Sensitivity Study No. Taking into account the results showed in Figures 6a - 6c, it can be concluded that an increment of the working pressure at the Distillation Column No.

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