Evaluation of solvent dearomatization effect in heavy feedstock thermal cracking to light olefin: An optimization study

Mostafa Ghasemi,Mohsen Nouri,Mehdi Sedighi,Majid Mohammadi 한국화학공학회 2013 Korean Journal of Chemical Engineering Vol.30 No.9

Response surface method was used to study the effect of aromatic extraction of heavy feedstock in thermal cracking. N-methylpyrrolidone as the solvent performing dearomatization of feedstock was at different temperature and molar solvent to oil ratios. Temperature, flow rate and steam-to-hydrocarbon ratio were in the range of 1,053-1,143K, 1-2 g/g, and 0.75-1.2 g/min, respectively. From the CCD studies, the effects of flow rate and coil outlet temperature were the key factors influencing the yield of light olefins. Ethylene and propylene yields increased more than 10%by dearomatization. C5+ decreased by 13% on average. Finally, we obtained the single maximum yield of ethylene,propylene, and simultaneous maximum yields for untreated and raffinate.

A novel polylysine–resorcinol base γ-alumina nanotube hybrid material for effective adsorption/preconcentration of cadmium from various matrices

Mostafa Hossein Beyki,Mohammad Hadi Ghasemi,Abbas Jamali,Farzaneh Shemirani 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.46 No.-

Polylysine–resorcinol coated alumina nanotube has been synthesized based on Mannich reaction. Synthetic polymer has been obtained using lysine and resorcinol as monomer and p-formaldehyde aslinker by condensation reaction. The nanosorbent was employed for cadmium adsorption from aqueoussamples. Effective parameters on sorption process have been optimized with Box–Behnken design (BBD). Equilibrium time was 11 min as well as adsorption capacity was 220 mg g 1. Regeneration of the sorbentwas performed with HNO3 solution (0.5 mol L 1). The accuracy of the method was evaluated bydetermination of cadmium in various real samples.

Effectiveness of Acceptance and Commitment Therapy on Life Expectancy of Female Cancer Patients at Tehran's Dehshpour Institute in 2015

Ghasemi, Farahnaz,Dehghan, Fateme,Farnia, Vahid,Tatari, Faeze,Alikhani, Mostafa Asian Pacific Journal of Cancer Prevention 2016 Asian Pacific journal of cancer prevention Vol.17 No.8

Background: Acceptance and commitment therapy (ACT) increases the psychological flexibility of people afflicted with cancer, and consequently improves their adaptability. The present research was conducted with the aim of determining the effectiveness of ACT for people afflicted with cancer. Materials and Methods: The present research was of semi-pilot type with a pre-test and post-test plan for the proof group. The demographics of the community were composed of all the women with cancer who were under treatment in Tehran's Dehshpour therapeutic center in 2015. The sample was composed of 24 people who were selected as available and chosen randomly in two groups of test and proof. All the participants responded to Snyder questionnaire in two pre-test and post-test stages, and the test group participated in treatment sessions after conducting the pre-test. Results: After collecting the information, data analysis was conducted in two description and inferential levels. The test results of covariance analysis showed that the two groups' hope was meaningfully different. Hope in the test group, compared to the proof group, increased meaningfully. Conclusions: The results show that the ACT is effective in increasing hope of patients with cancer.

An enhanced simulated annealing algorithm for topology optimization of steel double-layer grid structures

Mostafa Mashayekhi,Hamzeh Ghasemi Techno-Press 2024 Advances in computational design Vol.9 No.2

Stochastic optimization methods have been extensively studied for structural optimization in recent decades. In this study, a novel algorithm named the CA-SA method, is proposed for topology optimization of steel double-layer grid structures. The CA-SA method is a hybridized algorithm combining the Simulated Annealing (SA) algorithm and the Cellular Automata (CA) method. In the CA-SA method, during the initial iterations of the SA algorithm, some of the preliminary designs obtained by SA are placed in the cells of the CA. In each successive iteration, a cell is randomly chosen from the CA. Then, the "local leader" (LL) is determined by selecting the best design from the chosen cell and its neighboring ones. This LL then serves as the leader for modifying the SA algorithm. To evaluate the performance of the proposed CA-SA algorithm, two square-on-square steel double-layer grid structures are considered, with discrete cross-sectional areas. These numerical examples demonstrate the superiority of the CA-SA method over SA, and other meta-heuristic algorithms reported in the literature in the topology optimization of large-scale skeletal structures.

Catalytic performance of CeAPSO-34 molecular sieve with various cerium content for methanol conversion to olefin

Mehdi Sedighi,Mostafa Ghasemi,Alireza Jahangiri 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.4

A series of CeAPSO-34s with various cerium contents was synthesized and characterized by multiple techniques such as XRD, SEM, BET, 29Si MAS NMR, NH3-TPD and CO2-TPD. NH3-TPD spectra showed that a number of acid sites, especially those of strong acidity, is reduced with the increasing of Ce incorporation. Incorporation of metal ions gave rise to more silica-islands in the CeAPSO-34 framework. CO2-TPD showed that basic sites on the surface of modified samples are due to the presence of Ce-containing species incorporation into the framework of CeAPSO-34 molecular sieves. The performance of the catalysts was studied in methanol to olefin reactions at 425 oC under the atmospheric pressure. The results showed that the incorporation of cerium ions had great effects on the structure and acidity of the molecular sieves. All SAPO-34 and MeAPSO-34 molecular sieves were the very active and selective catalyst for light olefins production. Cerium incorporation improved the catalyst lifetime and favored the ethylene and propylene generation. However, an excess Ce content resulted in an inferior catalytic performance and stability. Therefore, there existed optimal cerium content for a specific SAPO-34.

Optimization of process parameters for friction stir lap welding of carbon fibre reinforced thermoplastic composites by Taguchi method

H. Ahmadi,N. B. Mostafa Arab,F. Ashenai Ghasemi 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.1

Friction stir welding process parameters such as welding speed, rotational speed and tilt angle affect the strength of the weld joint. Formaximizing the weld strength, these process parameters must therefore be properly selected and optimized. This study presents anapplication of Taguchi method to optimize process parameters like welding speed, rotational speed and tilt angle to maximize lap weldtensile-shear strength in 4 mm thick polypropylene composite sheets with 20 wt% carbon fiber. To this end, a L9 orthogonal array ofTaguchi method using three factors at three levels was used. Analysis of variance and confirmation tests were conducted. The resultsindicated that welding speed, rotational speed and tilt angle are respectively the significant parameters affecting the lap weld strength. Optimization results also showed that tensile-shear strength of 6.06 MPa was obtained when welding speed, rotational speed and tiltangle were 25 mm/min, 1250 rpm and 1 degree, respectively.

Microbial fuel cell for oilfield produced water treatment and reuse: Modelling and process optimization

Majid Mohammadi,Mehdi Sedighi,Rajamohan Natarajan,Sedky Hassan Aly Hassan,Mostafa Ghasemi 한국화학공학회 2021 Korean Journal of Chemical Engineering Vol.38 No.1

Oilfield produced water is one of the vast amounts of wastewater that pollute the environment and cause serious problems. In this study, the produced water was treated in a microbial fuel cell (MFC), and response surface methodology and central composite design (RSM/CCD) were used as powerful tools to optimize the process. The results of two separate parameters of sulfonated poly ether ether ketone (SPEEK) as well as nanocomposite composition (CNT/Pt) on the chemical oxygen demand (COD) removal and power generation were discussed. The nanocomposite was analyzed using XRD, SEM, and TEM. Moreover, the degree of sulfonation (DS) was measured by NMR. A quadratic model was utilized to forecast the removal of COD and power generation under distinct circumstances. To obtain the maximum COD removal along with maximum power generation, favorable conditions were achieved by statistical and mathematical techniques. The findings proved that MFC could remove 92% of COD and generate 545mW/m2 of power density at optimum conditions of DS=80; and CNT/Pt of 14 wt% CNT- 86 wt% Pt.