Saeed Zarrinpashne

Petroleum University of Technology

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Ahmad Ruzbehani

Iran Polymer and Petrochemical Institute

Faeze Tari

University of Stuttgart

Marzieh Shekarriz

Iran Polymer and Petrochemical Institute

Yahya Zamani

Iran University of Science and Technology

Elham Yaghoobpour

Ferdowsi University of Mashhad

Akbar Zamaniyan

National Iranian Oil Company (Iran)

Ali Akbar Safekordi

Islamic Azad University, Science and Research Branch

Ehsan Zhalehrajabi

University of Tehran

Nejat Rahmanian

University of Bradford

Soheila Gorji Kandi

Cooperative Institutions

National Iranian Oil Company (Iran)

University of Tehran

Iran Polymer and Petrochemical Institute

Sharif University of Technology

Tarbiat Modares University

Universiti Teknologi Petronas

Islamic Azad University, Tehran

Iran University of Science and Technology

Islamic Azad University, Science and Research Branch

Islamic Azad University, Shahr-e-Qods Branch

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A study on the extraction of essential oil of Persian black cumin using static supercritical CO₂ extraction, and comparison with hydro-distillation extraction method

Separation Science and Technology (2018)

Saeed Zarrinpashne Soheila Gorji Kandi

The essential oil of Persian black cumin was extracted using static supercritical CO2 technique at different temperatures, extraction times, and number of extractions. The composition of extracted oil was measured by GC-MS analysis and 25 components were identified. It was found that the oil recovery was reduced by increasing the temperature. Maximum recovery was achieved at two-step extraction that was about 49%. Both dissolution rate and solubility limited the oil recovery at the tested extraction conditions. The oxygenate components have less dissolution rate than the terpenes. The application of experimental data for design of an efficient dynamic extraction system was discussed.

Supercritical fluid extraction

Supercritical Carbon Dioxide

10.1080/01496395.2018.1541907

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Citations (9)

Modeling of mass transfer and hydrodynamic investigation of H2S removal from molten sulfur using porous Sparger

Heat and Mass Transfer (2019)

Faeze Tari Saeed Zarrinpashne Marzieh Shekarriz Ahmad Ruzbehani

Sparging

10.1007/s00231-019-02763-2

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Citations (2)

Catalytic and environmentally friendly removal of hydrogen sulfide from Claus-derived molten sulfur by nanosilica

International Journal of Environmental Science and Technology (2017)

Faeze Tari Marzieh Shekarriz Saeed Zarrinpashne Ahmad Ruzbehani

Polysulfide

Silanol

Claus process

Fluid catalytic cracking

Sour gas

10.1007/s13762-017-1616-4

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Modeling of Oxidative Coupling of Methane over Na2WO4/Mn/SiO2 Catalyst

Seifollah Jalili Saeed Zarrinpashne Zohreh Moeinpour

Methane is the predominant component of natural gas, from which many kinds of chemicals can be produced. Over the past two decades, extensive efforts have been made in indirect and direct conversion of methane into valuable products. One of the attractive applications of methane is the oxidative coupling of methane (OCM) to C2 hydrocarbons, especially ethylene.

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A Study on the Capacity of Reactive Distillation Bale Packings: Experimental Measurements, Evaluation of the Existing Models, and Preparation of a New Model

Industrial & Engineering Chemistry Research (2000)

Mohammad Mehdi Akbarnejad Ali Akbar Safekordi Saeed Zarrinpashne

The bale packings that are used as catalyst containing packings in reactive distillation columns are made and geometrically characterized. Pressure drop and holdup values are measured in a 10.4 cm i.d. glass column packed with bales using an air/water system. The arrangement of the bales in the bed is similar to that of industrial columns. The obtained data are used for evaluating the Stichlmair and the Eckert pressure drop models. Neither of these two models could fit the data properly. When a slight modification is made in the Eckert model, a specific model which fits the data well is prepared. This model also accounts for the effect of geometrical characteristics of the packed bed on pressure drop. It is then evaluated using the experimental data of Subawalla and co-workers on a nonreactive binary distillation system in which the bale geometry and the bale arrangement in the test column is different from that of the present work. A good agreement between their data and the new model is observed at low to moderate F factor values. The deviation from the data at higher F factors is also discussed.

Reactive distillation

Structured packing

Experimental data

10.1021/ie9904706

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Citations (20)

On Efficiency of Vanadium-Oxide Promoter in Cobalt Fischer-Tropsch Catalysts

Catalysis in Industry (2021)

Elham Yaghoobpour Yahya Zamani Saeed Zarrinpashne Akbar Zamaniyan

Fischer–Tropsch process

Vanadium Oxide

Incipient wetness impregnation

Cobalt oxide

10.1134/s2070050421020124

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Application of zinc oxide/silica nanocomposites for removal of hydrogen sulfide from liquid sulfur and optimization via RSM-CCD

Materials Research Express (2019)

Faeze Tari Marzieh Shekarriz Saeed Zarrinpashne Ahmad Ruzbehani

Separation of hydrogen sulfide from molten sulfur (sulfur-degassing) is a crucial issue of petroleum industry for production of elemental sulfur. High surface area zinc oxide/nanosilica catalysts have been used here for catalytic removal of hydrogen sulfide from molten sulfur. Accordingly, comparisons revealed that catalytic degassing was superior to non-catalytic degassing and also degassing by bare nanosilica, as during non-catalytic degassing effective removal of hydrogen sulfide from molten sulfur took more than seven hours and nanosilica degassing was accompanied by dehydroxylation. Accordingly, after optimizing the catalytic degassing conditions by RSM-CCD analysis, it was found that by applying 9.5 g of 1.5%wt ZnO/silica in degassing system for the duration of 280 min, the residual content of hydrogen sulfide reduced to a value as low as 1PPMW. By applying the regenerated catalyst the activity raised again.

Zinc sulfide

10.1088/2053-1591/ab33f6

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Citations (1)

On efficiency of vanadium-oxide promoter in cobalt Fischer – Tropsch catalysts

Kataliz v promyshlennosti (2021)

Elham Yaghoobpour Yahya Zamani Saeed Zarrinpashne Akbar Zamaniyan

Promoters and their loading amount have crucial roles in cobalt Fischer – Tropsch catalysts. In this regard, the effects of vanadium oxide (V2O5) as a proposed promoter for Co catalyst supported on TiO2 have been investigated. Three catalysts with 0, 1, and 3 wt.% of V2O5 promoter loading are prepared by the incipient wetness impregnation method, and characterized by the BET surface area analyzer, XRD, H2-TPR, and TEM techniques. The fixed-bed reactor was employed for their evaluations. It was found that the catalyst containing 1 wt.% V2O5 has the best performance among the evaluated catalysts, demonstrating remarkable selectivity: 92 % C5+ and 5.7 % CH4, together with preserving the amount of CO conversion compared to the unpromoted catalyst. Furthermore, it is reported that the excess addition of V2O5 promoter (> 1 wt.%) in the introduced catalyst leads to the detrimental effect on the CO conversion and C5+ selectivity, mainly owing to diminished active sites by V2O5 loading.

Fischer–Tropsch process

Vanadium Oxide

Incipient wetness impregnation

Cobalt oxide

10.18412/1816-0387-2021-1-2-15

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Fischer-Tropsch Synthesis: Modeling and Performance Study for Fe-HZSM5 Bifunctional Catalyst

Chemical Engineering & Technology (2005)

Mahdi Ahmadi Marvast Morteza Sohrabi Saeed Zarrinpashne Gh. Baghmisheh

A water-cooled fixed bed Fischer-Tropsch reactor packed with Fe-HZSM5 catalyst has been modeled in two dimensions (radial and axial) using the intrinsic reaction rates previously developed at RIPI. The reactor is used for production of high-octane gasoline from synthesis gas. The Fischer-Tropsch synthesis reactor was a shell and tube type with high pressure boiling water circulating on the shell side. By the use of a two-dimensional model, the effects of some important operating parameters such as cooling temperature, H2/CO ratio in syngas and reactor tube diameter on the performance capability of the reactor were investigated. Based on these results, the optimum operating conditions and the tube specification were determined. The model has been used to estimate the optimum operating conditions for the pilot plant to be operated in RIPI.

Fischer–Tropsch process

Bifunctional catalyst

Water-gas shift reaction

10.1002/ceat.200407013

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Citations (97)

A MATHEMATICAL MODEL FOR CALCULATION OF EFFECTIVENESS FACTOR IN CATALYST PELLETS OF HYDROTREATING PROCESS

Saeid Shokri Saeed Zarrinpashne

Sulfur compounds are one of the most important impurities in various petroleum fractions that cause some problems. For example, in the case of fuels they cause environmental pollution, and in the refining and petrochemical industries they poison catalysts. One of the recent challenges in the petroleum refineries is the reduction of sulfur content of gas oil to the new lower limits. The specification for the sulfur content of gas oil has been reduced from 500 ppm to 50 ppm in 2005. This purpose can be achieved by hydrodesulfurization process (HDS) in trickle bed reactors as specific multiphase reactors. In the most of trickle bed reactors, reactions are carried out on the surface and within the pores of cobalt molybdom over alumina support (CoMo/Al2O3). Catalyst. [1] In this work a mathematical model for the effectiveness factor of HDS catalyst has been developed, based on the mass balance equations inside the catalyst pellet to gather with a kinetic model for dibenzothiophene as representative of sulfur component of gas oil. Also, for solution non-linear algebraic equations in catalyst pellets has been used orthogonal collocation method and modified Powel dogleg numeric methods.

Dibenzothiophene

Petrochemical

Refining (metallurgy)

Pellet

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Citations (7)