Thongchai Rohitatisha SRINOPHAKUN - Academia.edu (original) (raw)

Papers by Thongchai Rohitatisha SRINOPHAKUN

Asian Journal of Applied Sciences, Jun 17, 2019

This article presents a reactive distillation simulation model of biodiesel production from the f... more This article presents a reactive distillation simulation model of biodiesel production from the feed of 1,000 kg/h Jatropha oil. Starting with the verification of the conventional process at the purification sections and improve transesterification calculation, the model gives a realistic solution. GaussViewW and GAUSSIAN 03W are used to generate the molecular structure for other key compositions including triglyceride, diglyceride, and monoglyceride of oleic and linoleic acid which are major components of Jatropha oil. The biodiesel conversion 1.14 % and energy 1.36 %; requirement by the reactive distillation process are higher than the conventional process which the conversion of conventional process and reactive distillation are 98.2 and 99.8 respectively. However, reactive distillation can almost consume the reactant completely. While there are some triolein and diolein in biodiesel from the conventional process, these residues impact on the quality of biodiesel. The recycling system can also reduce fresh methanol by about 81%. The optimum conditions of reactive distillation are 2 stages of the reaction zone, no rectifying section, no stripping section, 5 reflux ratio, and 1 atm. The controllability of the process is studied by varying the feed oil ± 2%. The control structure of the process can handle these disturbances and keep the product at the desired specification.

To elucidate the propagation of error or bias from the measurement of a process, the data require... more To elucidate the propagation of error or bias from the measurement of a process, the data requires reconciliation. In this article, a genetic simulated annealing algorithm (GSA) based program is proposed for solving data reconciliation (DR) problems. The proposed GSA utilizes simultaneous simulated annealing and modified cross-generational probabilistic survival selection (CPSS) in a genetic algorithm. Validation is performed with linear and nonlinear DR problems. The test starts with the study of appropriate GSA parameters of constraint problems. The performance of GSA with the appropriate parameters is then compared to the genetic algorithm (GA) method, the specific method, and the commercial software DATACON. The proposed GSA, with its ability to give more accurate reconciled data, is a promising choice as an optimization tool for data reconciliation problems.

Engineering and Applied Science Research, 2005

A computational fluid dynamics simulation, CFD, of ethylene oxychlorination for the production of... more A computational fluid dynamics simulation, CFD, of ethylene oxychlorination for the production of 1,2-dichoroethane in a fluidized-bed reactor is developed in this research. This CFD model bases on two-phase flow model that is used to perform the high resolution of three-dimension numerical simulations of gas-solid in a fluidized bed, The results can be shown as the profile of temperature and parameters distribution. In the study of ethylene mole fraction from 0.227 to 0.356 with constant ratio of hydrochloric acid to oxygen at 3.6. the optimum operating condition for a maximum ethylene conversion is found at mole ti'action of ethylene equal to 0.34. The behavior of fluid in the operating temperature and ethylene conversion gradually increase according to the increase of cooling coils temperature from 300 to 450 K. The maximum ethylene conversion. 95%. occurred at cooling coils temperature of 450 K.

Molecules, Jun 6, 2023

This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY

Iranian Journal of Chemistry & Chemical Engineering-international English Edition, Jun 8, 2020

The hybrid gasification-syngas fermentation platform can produce more bioethanol utilizing all bi... more The hybrid gasification-syngas fermentation platform can produce more bioethanol utilizing all biomass components compared to the biochemical conversion technology. Syngas fermentation operates at mild temperatures and pressures and avoids using expensive pretreatment processes and enzymes. This study presents a new process simulation model developed with Aspen Plus® of a biorefinery based on a hybrid conversion technology for the production of anhydrous ethanol using 1200 tons per day (wb) of switchgrass. The simulation model consists of three modules: gasification, fermentation, and product recovery. The results revealed a potential production of about 36.5 million gallons of anhydrous ethanol per year. Sensitivity analyses were also performed to investigate the effects of gasification and fermentation parameters that are keys for the development of an efficient process in terms of energy conservation and ethanol production.

International Journal of Technology: IJ Tech, Dec 28, 2022

Bioethanol has become more attractive as an alternative to fossil-based fuel: a biofuel and fuel ... more Bioethanol has become more attractive as an alternative to fossil-based fuel: a biofuel and fuel additive to gasoline. Therefore, people are interested in ethanol from a feedstock that does not compete with the food supply. Oil palm empty fruit bunch (EFB) are major biomass by-products from the palm oil industry. This study proposes commercial-scale bioethanol production from EFB of 99.5 wt.% at 10,000 L/day ethanol. This bioethanol production was formulated using the commercial simulator and divided into four stages: pre-treatment, Hydrolysis, fermentation, and purification. EFB is pretreated using hot water, hot-compressed water, and alkaline hydrogen peroxide approaches. Simultaneous Saccharification and fermentation are chosen to produce the target of ethanol. At optimum conditions, it can conclude that the ethanol production rate was 13,950 litter per day by using an empty fruit bunch of 47,208 kg per day. Finally, the economic feasibility is also evaluated under techno-economic analysis. From the economic perspective, the net present value (NPV), internal rate of return (IRR), and payback period (PBP) equate to 9.016 M USD, 15%, and seven years, respectively, based on 20 years of life and a total capital investment of 12.32 M USD. The results show that bioethanol production is profitable.

Engineering and Applied Science Research, 1998

Polish Journal of Chemical Technology, Mar 1, 2018

In this article, the dynamic responses of heat exchanger networks to disturbance and setpoint cha... more In this article, the dynamic responses of heat exchanger networks to disturbance and setpoint change were studied. Various control strategies, including: proportional integral, model predictive control, passivity approach, and passivity-based model predictive control were used to monitor all outlet temperatures. The performance of controllers was analyzed through two procedures: 1) inducing a ±5% step disturbance in the supply temperature, or 2) tracking a ±5 o C target temperature. The performance criteria used to evaluate these various control modes was settling time and percentage overshoot. According to the results, the passivity-based model predictive controllers produced the best performance to reject the disturbance and the model predictive control proved to be the best controller to track the setpoint. Whereas, the ensuing performance results of both the PI and passivity controllers were discovered to be only acceptable.

Chemical Engineering Communications, Jul 11, 2017

In this paper, Mixed Integer Nonlinear Programming (MINLP) is optimized by PSO_GA−SQP, the mixed ... more In this paper, Mixed Integer Nonlinear Programming (MINLP) is optimized by PSO_GA−SQP, the mixed coding of a Particle Swarm Optimization (PSO) and a hybrid Genetic Algorithm and Sequential Quadratic Programming (GA−SQP). The population is separated into two groups: discrete and continuous variables. The discrete variables are optimized by the adapted PSO, while the continuous variables are optimized by the GA−SQP using the discrete variable information from the adapted PSO. Therefore, the population can be set to a smaller size than usual to obtain a global solution. The proposed PSO_GA−SQP algorithm is verified using various MINLP problems including the designing of retrofit heat exchanger networks. The fitness values of the tested problems are able to reach the global optimum.

The Journal of Chemical Thermodynamics, Mar 1, 2011

To design a reactor and separator for a supercritical biodiesel process, phase equilibria of mult... more To design a reactor and separator for a supercritical biodiesel process, phase equilibria of multi-component mixtures in supercritical fluids should be determined using group contribution with association equation of state (GCA-EOS) as a thermodynamics method. The model is considered for two systems of reactants and products. System 1 is comprised of methanol and triglycerides from two sources (palm and Jatropha oils); and System 2 is unconverted methanol, FAME (product) and glycerol (by-product). Pressure and temperature diagrams were developed at different mole fraction of methanol (x MeOH). As x MeOH increased, the critical temperature (T c) and pressure (p c) increased. The increasing temperature causes the immiscibility region and the amount of methanol at the plait point to decrease. The maximum plait point pressure was observed at 19.20 MPa for palm and 19.33 MPa for Jatropha oil systems.

Kasetsart Journal. Natural Sciences, 2014

A simulation and design method was proposed for biodiesel production from palm oil. The reactant ... more A simulation and design method was proposed for biodiesel production from palm oil. The reactant contained three main fatty acids: palmitic, oleic and linoleic acids. The molecular structure design enabled all parameters to be estimated for the process model and simulation. The biodiesel production simulated both conventional and reactive distillation processes. The purity from the conventional process, catalyzed by sodium hydroxide (homogeneous) and strontium oxide (heterogeneous) was 99.45 and 95.21%, respectively. On the other hand, the purity from reactive distillation with strontium oxide (99.87%) was higher than with sodium hydroxide (99.52%). The steady state result was used for the economic simulation of the equipment design. The total cost of biodiesel production using sodium hydroxide and strontium oxide catalysts in a conventional distillation process was USD 0.6701 L -1 and USD 0.6291 L -1 , while for the reactive distillation process, the total cost was USD 0.6302 L -1 and USD 0.6262 L -1 , respectively.

Journal of Energy Resources Technology-transactions of The Asme, May 7, 2021

This study examined product separation in biodiesel power plants to optimize the process. Respons... more This study examined product separation in biodiesel power plants to optimize the process. Response surface methodology (RSM) was used to identify the optimum parameters for the process of separation, to maximize profitability while also reducing carbon dioxide emissions. The mass and energy balance was assessed using aspen plus software, while RSM was carried out with design-expert software. Development of the characteristic equation determined that the model for gasoline yield, power generation, and carbon dioxide emissions was significant at the 95% confidence level. The R-squared value predicted by the model was found to be 0.97–1.00. In an optimal plant, profit can rise by 3836 USD over the year, while carbon dioxide emissions decline annually by 17.97 tons.

Conventional hydrogen production, as an alternative energy resource, has relied on fossil fuels t... more Conventional hydrogen production, as an alternative energy resource, has relied on fossil fuels to produce hydrogen, releasing CO2 into the atmosphere. Hydrogen production via the dry forming of methane (DRM) process is a lucrative solution to utilize greenhouse gases, such as carbon dioxide and methane, by using them as raw materials in the DRM process. However, there are a few DRM processing issues, with one being the need to operate at a high temperature to gain high conversion of hydrogen, which is energy intensive. In this study, bagasse ash, which contains a high percentage of silicon dioxide, was designed and modified for catalytic support. Modification of silicon dioxide from bagasse ash was utilized as a waste material and the performance was explored of bagasse ash-derived catalysts interacting with light irradiation and reducing the amount of energy used in the DRM process. The results showed that the performance of 3%Ni/SiO2 bagasse ash WI was higher than that of 3%Ni/Si...

Kasetsart Journal. Natural Sciences, 2000

The Computational Fluid Dynamics software (CFD) is used to address the understanding of mixing ph... more The Computational Fluid Dynamics software (CFD) is used to address the understanding of mixing phenomena of Bakers’ Yeast Fermenter. This 1500 liter fermenter performed the fed-batch culture of Saccharomyces cerevisiae with molasses and ammonia with low yield and yeast concentration. The mixing behaviour is considered as the major defection of the amount of yield. An analysis of mixing phenomena using CFD shows the profile of liquid comparing between the current plant and the suggested configurations. The alternative configurations are reported in terms of sensitivity analysis. These parameters are: increase off bottom clearance to 0.48 meter, increase turbine diameter to 0.48 meter, lower operating liquid height to 1.38 meter and higher rotational speed to 400 rpm.

Proceedings of the 3rd World Congress on Mechanical, Chemical, and Material Engineering, Jun 1, 2017

International Journal of Renewable Energy Research

Every 1 kg of palm oil fruit produces an empty fruit bunch (EFB) weighing approximately 0.25 kg. ... more Every 1 kg of palm oil fruit produces an empty fruit bunch (EFB) weighing approximately 0.25 kg. The EFB is considered as the agricultural waste of the palm oil industry due to the excessive amounts produced. The majority of EFB is not appropriately utilized and produces a high level of CO2 as a result of abandonment to landfills. This study investigates the utilization of conventional fast pyrolysis (CFP) to make the biofuel products from EFB waste. Additionally, microwaveassisted pyrolysis (MAP), a new high-performance technique, is also investigated. The calculation of mass and energy balance is conducted using commercial simulation software. The benefits of this plant are investigated in terms of economics and climate change. The results show that neither CFP nor MAP benefits the economy of developing the power plants since they are not profitable. The net present value (NPV) of CFP and MAP are-1,127,674 and-1,073,772 USD, respectively. However, from the climate change aspects, both power plants provide good environmental impact performance. The CO2 emissions resulting from the non-managed disposal of EFB for the CFP and MAP plants were 924, 917, 895 tCO2/yr., respectively. Although the development of these plants might not be beneficial from an economic perspective, they contribute significantly to the reduction of CO2 emissions compared with direct disposal through landfills. This work describes the advantages of using renewable technology in a transparent environmentally friendly process.

ASEAN Journal of Chemical Engineering

In a tubular photobioreactor, microalgae cells obscure one another (Self-shading), leading to the... more In a tubular photobioreactor, microalgae cells obscure one another (Self-shading), leading to the microalgae at the bottom of the tube getting less light. The objective of this research was to design and develop Tubular Photobioreactor with 93.5 liters for microalgae cultivation. The experiments had two steps. The first step was designing the solar receiver by inserting the fin into each tube wall as follows: 12-34, 1-2-3-4, 1234, and 13-24. Then, FLUENT software was used to simulate flow behavior inside the tube by Computational Fluid Dynamics by observing the pressure drop, the amount of energy consumption, and the swirling velocity to select the best fin-type. The best fin-type with the growth rate equation is introduced in the next step to simulate the microalgae's growth and movement using the user-defined function technique. The comparison of a tubular photobioreactor is investigated between fin and without fin by observing biomass production. The results showed that algae...

Extended Abstract Heat exchanger networks (HEN) are major consumption units which are energy effi... more Extended Abstract Heat exchanger networks (HEN) are major consumption units which are energy efficient and economical in the chemical and processing industry [1]. The design of heat exchanger networks is a subject that has received significant attention for quite some time. One of the methods for optimal design of heat exchanger networks is the passivity concept [2] which is the analysis of the general process stability that can be used as a powerful tool in analysing dynamic systems and controller design [3]. This concept is implemented to guarantee controllability and robust controller tuning. Thus, this work mainly focuses on the application of a passivity method for heat exchanger networks of the Ethyl Benzene process [4] and to perform an analysis of a network cost index after the process improvement by the Aspen Energy Analyzer. Dynamic models are generated for all variables of the unit in the state space domain. Subsequently, the state space model of heat exchanger networks i...

Processes, 2020

In tropical countries, such as Thailand, the variation of tree moisture content can be significan... more In tropical countries, such as Thailand, the variation of tree moisture content can be significant based on seasonal variations in rainfall. Pulp mill operation optimization accounting for wood moisture variation was used to determine optimal operation conditions and minimize production cost. The optimization models were built using empirical modeling techniques with simulated data from the IDEAS software package. Three case studies were performed. First, a base case of nominal annual operation at a fixed production rate was used to calculate production cost that varies with wood moisture content. The second case is annual optimization where production was allowed to vary monthly over an annual cycle to minimize production cost. For the third case, real-time optimization (RTO) was used to determine optimal production rate with the wood moisture content varying every 3 days. The rolling horizon approach was used to schedule production to keep inventory levels within bounds and with a...