Comparing Usage of Temperature Control and Composition Control for Reactive Distillation Column in Methyl Ester Production

2011 ◽  
Vol 6 (1) ◽  
Author(s):  
Kulchanat Prasertsit ◽  
Chakrit Tongurai ◽  
Chokchai Mueanmas
Keyword(s):  
Methyl Ester ◽  
Temperature Control ◽  
Distillation Column ◽  
Reactive Distillation ◽  
The Other ◽  
Base Case ◽  
Control Performance ◽  
Control Loop ◽  
Composition Control ◽  
And Performance

The temperature control and the composition control for the production process was used to evaluated a method to control the quality of methyl ester production in a reactive distillation column. The optimum condition at steady state was selected as the base case condition for the control study by using Aspen Dynamic Simulation. In this work, two controller settings for PID controller of each control loop were based on the Zeigler-Nichol and the Tyreus-Luyben tuning formulae. The controllability and performance of both control structures were compared. The result shows that the control loop using the Ziegler-Nichols setting gave better control performance than the other using the Tyreus-Luyben setting. It also found that the control structure based on temperature control gives the same control performance as the other based on composition control, but less expensive and less complicated to implement.

A Novel SOFC Thermal Management Strategy of SOFC-GT Hybrid System With Anode and Cathode Control Loops

2020 ◽  
Author(s):  
Jinwei Chen ◽  
Yuanfu Li ◽  
Huisheng Zhang ◽  
Zhenhua Lu
Keyword(s):  
Thermal Management ◽  
Temperature Control ◽  
Management System ◽  
Management Strategy ◽  
Inlet Temperature ◽  
Control Performance ◽  
Control Loop ◽  
Control Loops ◽  
Thermal Management System ◽  
Cathode Temperature

Abstract The SOFC performance and lifetime highly depend on the operation condition, especially the SOFC operation temperature. The temperature fluctuation causes thermal stress in electrodes and electrolyte ceramics. On the other hand, it also needs to maintain a sufficiently high temperature to enable the efficient transport of oxygen ions across the electrolyte. Therefore, it is necessary to design an effective SOFC temperature management system to guarantee safe and efficient operation. In this paper, a two-side temperature control method is proposed to avoid the temperature difference between anode and cathode. Therefore, the SOFC thermal management system includes two control loops. The anode inlet temperature and cathode inlet temperature are controlled by blowers adjusting the recirculated flow rate. In addition, the control performance of the proposed SOFC thermal management system is compared with one-side temperature control systems. The results show that both anode control loop and cathode control loop are essential to get a better control performance. The SOFC would operate with less efficiency with only anode temperature control. On the other hand, the safety problem would occur with only cathode temperature control. The temperature gradient would be more than the upper limit at a part load condition. Therefore, the SOFC thermal management strategy with anode and cathode temperature control loops is feasible for the SOFC-GT system.

Study on the Temperature and Humidity Control Performance of Hwang-Toh Finish

2012 ◽  
Vol 204-208 ◽  
pp. 3652-3659 ◽  
Author(s):  
Kyuin Lee ◽  
Dong Woo Yeom ◽  
Byeon Gho Lee
Keyword(s):  
Indoor Environment ◽  
Full Scale ◽  
The Other ◽  
Performance Evaluations ◽  
Indoor Environments ◽  
Control Performance ◽  
Humidity Control ◽  
Temperature And Humidity ◽  
And Performance

This research tried to analyze the effects of ecological materials on indoor environments. For this purpose, two full scale mock-ups were constructed: one with silk wall paper, which is generally used for indoor finishing and the other with hwang-toh (yellow soil), which is the preferred material for wall finishing. Comparison and performance evaluations were conducted, and the effects of hwang-toh finishing on a humid indoor environment were verified. Through this research, it was verified that a hwang-toh plaster finish is effective in maintaining the comfort of an indoor environment

scholarly journals Dynamic Simulation, Parameter Optimization, and Control of a Reactive Distillation Column for Production of Isopropanol via Propylene Hydration

2021 ◽  
Vol 34 (4) ◽  
pp. 233-242
Author(s):  
Bahareh Feizi-Afshar ◽  
Ali Farzi
Keyword(s):  
Distillation Column ◽  
Reactive Distillation ◽  
Freezing Point ◽  
Base Case ◽  
Operating Variables ◽  
Point Tracking ◽  
Condenser Temperature ◽  
Optimization And Control ◽  
Simulation Parameter ◽  
And Control

In this study, a reactive distillation column for production of isopropanol was investigated. Firstly, a dynamic model was developed for the process. The model of the process was then programmed, and the process simulated using a base case obtained from the literature. Results showed that distillate contained more than 58 mol% propylene-free<br /> isopropanol. In the next step, optimization of some operating variables was performed to<br /> maximize concentration of isopropanol in distillate with condenser temperature as constraint, which was considered to be above the freezing point of water. Several simulations were performed by changing operating parameters, and finally optimum isopropanol content in distillate was obtained above 58 mol%. Results of using classic controllers showed that PID controller had the best performance for both condenser temperature set-point tracking and disturbance rejection.

Optimal design and performance analyses of the glycerol ether production process using a reactive distillation column

2016 ◽  
Vol 43 ◽  
pp. 93-105 ◽  
Author(s):  
Lida Simasatitkul ◽  
Punjawat Kaewwisetkul ◽  
Wisitsree Wiyaratn ◽  
Suttichai Assabumrungrat ◽  
Amornchai Arpornwichanop
Keyword(s):  
Optimal Design ◽  
Production Process ◽  
Distillation Column ◽  
Reactive Distillation ◽  
Glycerol Ether ◽  
Performance Analyses ◽  
And Performance

scholarly journals Evaluation of mechanical vapor recompression in the reactive distillation of the N-butanol esterification process

2021 ◽  
Vol 10 (12) ◽  
pp. e243101220345
Author(s):  
Danyelle Fialho de Souza Rodrigues ◽  
Arthur Siqueira Damasceno ◽  
Wagner Brandão Ramos ◽  
Romildo Pereira Brito ◽  
Karoline Dantas Brito
Keyword(s):  
Distillation Column ◽  
Butyl Acetate ◽  
Reactive Distillation ◽  
Waste Heat ◽  
Process Intensification ◽  
Point Of View ◽  
The Other ◽  
Distillation Process ◽  
Distillation Columns ◽  
Vapor Recompression

The process of producing esters is usually performed through esterification in a reactor followed by a distillation column to separate the products. However, this design limits the reagent conversion. Reactive distillation is an alternative to get around this issue as it allows greater reagent conversions in reactions limited by chemical equilibrium. It is one of the most famous process intensification techniques. On the other hand, mechanical vapor recompression has been used to recycle waste heat to improve efficiency of conventional distillation columns. In this context, this work evaluated the inclusion of a mechanical vapor recompression system in a reactive distillation process to obtain n-butyl acetate via n-butanol esterification with acetic acid. Systems with and without recompression were simulated in an Aspen Plus™ environment. The addition of recompression resulted in a reduction of 33.65% in the annual cost of the process, while not significantly affecting the purity of the desired product and the reagents’ conversion. From an environmental point of view, the mechanical vapor recompression system adoption resulted in a 12.69% reduction in CO2 emissions, contributing positively to meeting the requirements of the environmental regulations.

Activity of Plasmin and Streptokinase-Activator on Substituted Arginine and Lysine Esters

1966 ◽  
Vol 16 (01/02) ◽  
pp. 018-031 ◽  
Author(s):  
S Sherry ◽  
Norma Alkjaersig ◽  
A. P Fletcher
Keyword(s):  
Molecular Structure ◽  
Methyl Ester ◽  
Comparative Studies ◽  
Esterase Activity ◽  
Methyl Esters ◽  
Hydrolytic Activity ◽  
The Other ◽  
Other Hand

SummaryComparative studies have been made of the esterase activity of plasmin and the streptokinase-activator of plasminogen on a variety of substituted arginine and lysine esters. Human plasmin preparations derived by different methods of activation (spontaneous in glycerol, trypsin, streptokinase (SK) and urokinase) are similar in their esterase activity; this suggests that the molecular structure required for such esterase activity is similar for all of these human plasmins. Bovine plasmin, on the other hand, differs from human plasmin in its activity on several of the substrates studied (e.g., the methyl esters of benzoyl arginine and tosyl, acetyl and carbobenzoxy lysine), a finding which supports the view that molecular differences exist between the two animal plasmins. The streptokinase-activator hydrolyzes both arginine and lysine esters but the ratios of hydrolytic activity are distinct from those of plasmin and of other activators of plasminogen. The use of benzoyl arginine methyl ester as a substrate for the measurement of the esterase activity of the streptokinase-activator is described.

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