scholarly journals Evaluación de arcillas pilareadas impregnadas con Fe/Mo para la obtención de acetaldehído a partir de etanol en un reactor de lecho fijo

2021 ◽  
Vol 12 (1) ◽  
pp. 59-65
Author(s):  
Salvador Oré V. ◽  
Cristina Merino R. ◽  
Diego Ramírez Ch.
Keyword(s):  

El presente trabajo de investigación tiene como objetivo, preparar una bentonita pilareada con hierro, para ser utilizado como soporte catalítico, impregnada con Fe/Mocomo fase activa del catalizador para la obtención de acetaldehído a partir de etanol en un reactor de lecho fijo. El catalizador de hierro, molibdeno soportado en montmorillonita(Fe/Mo-Mt) se sintetizó de acuerdo al procedimiento recomendado por Qiuqiang, Wu, Li, Zhu, & Dang (2009). En primer lugar, se consideró la relación Fe/Mo = 1.5. Este producto se desarrolló como un catalizador estructurado en piedra pómez para luego hacer las pruebas experimentales en un reactor catalítico de lecho fijo el cual consta de un evaporador, un precalentador un reactor, un condensador y una trampa. Las variables a controlar fueron la temperatura del reactor y el flujo de aire. La evaluación de los parámetros termodinámicos, así como, el balance de materia y energía en el reactor catalítico de lecho fijo, se han realizado mediante el Aspen Hysys, versión 8.4. Se obtuvo acetaldehído a partir de etanol, en un reactor catalítico de lecho fijo, a una temperatura en el precalentador de 250 °C y de 300 °C en el reactor, en donde la primera fracción de la mezcla alcanzó la temperatura de 47.6 °C, y que de acuerdo al diagrama de equilibrio líquido-vapor determinado mediante el método de contribución de grupos UNIFAC la composición correspondeal 0.55 fracción molar del acetaldehído.

Author(s):  
S. Majid Abdoli ◽  
Mahsa Kianinia

Background: Ethylene, propylene, and butylene as light olefins are the most important intermediates in the petrochemical industry worldwide. Methanol to olefins (MTO) process is a new technology based on catalytic cracking to produce ethylene and propylene from methanol. Aims and Objective: This study aims to simulate the process of producing ethylene from methanol by using Aspen HYSYS software from the initial design to the improved design. Methods: Ethylene is produced in a two-step reaction. In an equilibrium reactor, the methanol is converted to dimethyl ether by an equilibrium reaction. The conversion of the produced dimethyl ether to ethylene is done in a conversion reactor. Changes have been made to improve the conditions and get closer to the actual process design done in the industry. The plug flow reactor has been replaced by the equilibrium reactor, and the distillation column was employed to separate the dimethyl ether produced from the reactor. Result and Conclusion: The effect of the various parameters on the ethylene production was investigated. Eventually, ethylene is


2020 ◽  
Vol 15 (3) ◽  
Author(s):  
Afshar Alihosseini

AbstractCurrently, air separation units (ASUs) have become very important in various industries, particularly oil and petrochemical industries which provide feed and utility services (oxygen, nitrogen, etc.). In this study, a new industrial ASU was evaluated by collecting operational and process information needed by the simulator by means of HYSYS software (ASPEN-ONE). The results obtained from this simulator were analyzed by ASU data and its error rate was calculated. In this research, the simulation of ASU performance was done in the presence of an expansion turbine in order to provide pressure inside the air distillation tower. Likewise, the cooling capacity of the cooling compartment and the data were analysed. The results indicated that expansion turbine is costly effective. Notably, it not only reduces the energy needed to compress air and supply power of the equipment, but also provides more cooling power and reduces air temperature. Moreover, turbines also increase the concentration of lighter gas products, namely nitrogen.


2015 ◽  
Vol 3 (1) ◽  
pp. 178
Author(s):  
Mohsen Darabi ◽  
Mohammad Mohammadiun ◽  
Hamid Mohammadiun ◽  
Saeed Mortazavi ◽  
Mostafa Montazeri

<p>Electricity is an indispensable amenity in present society. Among all those energy resources, coal is readily available all over the world and has risen only moderately in price compared with other fuel sources. As a result, coal-fired power plant remains to be a fundamental element of the world's energy supply. IGCC, abbreviation of Integrated Gasification Combined Cycle, is one of the primary designs for the power-generation market from coal-gasification. This work presents a in the proposed process, diluted hydrogen is combusted in a gas turbine. Heat integration is central to the design. Thus far, the SGR process and the HGD unit are not commercially available. To establish a benchmark. Some thermodynamic inefficiencies were found to shift from the gas turbine to the steam cycle and redox system, while the net efficiency remained almost the same. A process simulation was undertaken, using Aspen Plus and the engineering equation solver (EES).The The model has been developed using Aspen Hysys® and Aspen Plus®. Parts of it have been developed in Matlab, which is mainly used for artificial neural network (ANN) training and parameters estimation. Predicted results of clean gas composition and generated power present a good agreement with industrial data. This study is aimed at obtaining a support tool for optimal solutions assessment of different gasification plant configurations, under different input data sets.</p>


Author(s):  
O.V. Kalashnikov ◽  
S.V. Budniak ◽  
Yu.V. Ivanov ◽  
Yu.M. Belyansky ◽  
N.O. Aptulina ◽  
...  

The experimental and calculated according to program systems GasCondOil, Aspen-HYSYS and PRO-II compositions of the gas — liquid phases (hydrocarbon and aqueous solutions) and their thermodynamic properties are compared, as well as the accuracy of technological calculations of field pipelines and natural gas and oil treatment processes. It is shown that some of the field technological processes, calculated by the program system GasCondOil, are not modeled on Aspen-HYSYS. Bibl. 16, Fig. 9, Tab. 15.


Author(s):  
Suoton P. Peletiri ◽  
Nejat Rahmanian ◽  
Iqbal M. Mujtaba

There is need to accurately design pipelines to transport the expected increase of CO2 captured from industrial processes after the signing of the Paris Climate Agreement in 2016. This paper reviews several aspects of CO2 pipeline design with emphasis on pressure drop and models for the calculation of pipeline diameter. Two categories of pipeline equations were identified. The first category is independent of pipeline length and has two different equations. This category is used to specify adequate pipeline diameter for the volume of fluid transported. The optimum economic pipe diameter equation (Eq. 17) with nearly uniform resultant velocity values at different flow rates performed better than the standard velocity flow equation (Eq. 20). The second category has four different equations and is used to calculate pipeline pressure drop or pipeline distance for the installation of booster stations after specifying minimum and maximum pipeline pressures. The hydraulic equation is preferred because it gave better resultant velocity values and the closest diameter value obtained using Aspen HYSYS (V.10) simulation. The effect of impurities on the pressure behaviour and optimal pipeline diameter and pressure loss due to acceleration were ignored in the development of the models. Further work is ongoing to incorporate these effects into the models.


2021 ◽  
Vol 23 (12) ◽  
pp. 323-338
Author(s):  
Muhammad El-Gharbawy ◽  
◽  
Walaa Shehata ◽  
Fatima Gad ◽  
◽  
...  

In this paper, the simulation and optimization of an industrial ammonia synthesis reactor is illustrated. The converter under study is of a vertical design, equipped with three radial-flow catalyst beds with inter-stage cooling and two quenching points. For building the model, a modified kinetic equation of ammonia synthesis reaction, based on Temkin- Pyzhev equation and an innovative correlation for (KP) prediction, was developed in suitable form for the implementation in Aspen HYSYS plug flow reactor using the spreadsheet embedded in the software with the introduction of some invented simulation techniques. A new parameter, which is a function of (T, P and α), was introduced into the reaction rate equation to account for the variation of KP with pressure. The simulation model is able to describe the converter behavior with acceptable accuracy. A case study was done, using Aspen HYSYS Optimizer, illustrated the optimum reactor temperature profile, after 12 years of operation, to achieve maximum production. The result predicts an increase of 8 tons ammonia per day accompanied with an increase of steam production of 12 tons per day.


Author(s):  
A. K. TAKAKURA ◽  
E. C. COSTA ◽  
N. T. MACHADO ◽  
M. E. ARAÚHO ◽  
L. E. P. BORGES
Keyword(s):  

Author(s):  
Najran Malfi ◽  
Chafia Sobhi ◽  
O-Madjeda Mecelti ◽  
Sulaiman Mogalli ◽  
Issam Bougdah
Keyword(s):  

Author(s):  
Jesús David Rhenals Julio ◽  
Carlos Manuel Romero Luna ◽  
Diogo Nunes

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