Flocculation of Pseudomonas delafieldii R-8 by γ-Polyglutamic Acid Combined with Celite for Biodesulfurization of Model Oil

2013 ◽  
Vol 726-731 ◽  
pp. 368-372
Author(s):  
Fei Yan Zhu ◽  
Zhong Bo Hu
Keyword(s):  
Immobilized Cells ◽  
Polyglutamic Acid ◽  
Desulfurization Rate ◽  
Model Oil ◽  
Pseudomonas Delafieldii ◽  
Desulfurization Activity

γ-polyglutamic acid (PGA) was firstly used for recovery and immobilization of Pseudomonas delafieldii R-8 cells in biodesulfurization process. The PGA mediated flocculation was combined with celite adsorption to immobilize R-8 cells and the as-prepared immobilized cells showed a high initial specific desulfurization rate at 0.243 mmol l-1 h-1 and a good desulfurization stability with 95% desulfurization activity remained after 6 batches of desulfurization processes.

Desulfurization of Model Oil Containing Dibenzothiophene or 4,6-Dimethyl Dibenzothiophene by Alginate Immobilized Cells

2011 ◽  
Vol 233-235 ◽  
pp. 1171-1176
Author(s):  
Ming Fang Luo ◽  
Hui Zhou Liu
Keyword(s):  
Immobilized Cells ◽  
Resting Cells ◽  
Negative Bacterium ◽  
Simple Method ◽  
Alginate Gel ◽  
The Stability ◽  
Model Oil ◽  
Pseudomonas Delafieldii ◽  
Ca Alginate ◽  
Desulfurization Activity

Gram-negative bacterium, Pseudomonas delafieldii R-8 (CGMCC 0570) is capable of desulfurizing dibenzothiophene (DBT) and 4,6-dimethyldibenzothiophene (4,6-DMDBT) to produce corresponding monohydroxydimethylbiphenyl. The immobilization of the resting cells of this strain in Ca-alginate gel effectively improved the stability of the cells and the desulfurization ability per amount of cells. 1 mmol/L of DBT and 4,6-DMDBT could be completely degraded in about 1 d. About 39 percent of the activity for 4,6-DMDBT was recovered after immobilization. The desulfurization activity was increased with the decrease of the diameter of the beads. The Ca-alginate immobilized cells could be used repeatedly for over 190 h with the addition of calcium ions to strengthen them. A thin layer of hydrophobic polyurea was coated on the surface of Ca-alginate gel using a simple method. The desulfurization activity was enhanced after the coating.

Photocatalytic Oxidation Desulfurization of Fuel Using Nano-TiO2 in Ionic Liquid

2011 ◽  
Vol 282-283 ◽  
pp. 599-602 ◽  
Author(s):  
Ye Zhao ◽  
Ying Juan Hao ◽  
Fa Tang Li
Keyword(s):  
Ionic Liquid ◽  
Titanium Dioxide ◽  
Photocatalytic Oxidation ◽  
Sol Gel ◽  
Fuel Oil ◽  
X Ray Diffraction ◽  
Desulfurization Rate ◽  
Low Viscosity ◽  
Model Oil ◽  
Nano Titanium Dioxide

Nano-titanium dioxide (TiO2) was synthesized by sol-gel method and was used as photocatalyst for photocatalytic oxidation desulfurization of fuel oil. Et3NHCl·FeCl3 was synthesized as low-viscosity ionic liquid (IL) and used as efficient extractant and oxygen in air was used as oxidant. Nano-TiO2 was analysis by X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR). The factors influencing the desulfurization rate of model oil such as oil ratio, the amount of titanium dioxide, the air pass into the volume and photocatalytic time. The results show that the desulfurization rate could reach 98.5% in 3h under below conditions: TiO2 amount was 0.1g/100mL, air flow was 500 ml / min and V(IL):V(oil)=1:1.

scholarly journals [HDMF]Cl-based DES as highly efficient extractants and catalysts for oxidative desulfurization of model oil

RSC Advances ◽  
2019 ◽  
Vol 9 (25) ◽  
pp. 14400-14406
Author(s):  
Rong-xiang Zhao ◽  
Xiu-ping Li ◽  
Chun-feng Mao ◽  
Liangpei Hou ◽  
Xiaohan Gao
Keyword(s):  
Oxidative Desulfurization ◽  
Highly Efficient ◽  
Model Oil ◽  
Desulfurization Activity

[HDMF]Cl/XMCln exhibits high desulfurization activity. Meanwhile, the DES saving a lot of N,N-dimethylformamide protects environment.

Rheology of Cyclopentane Hydrates formed in Water-in-model Oil Emulsions

2020 ◽  
Author(s):  
Marcio Ozorio ◽  
Gustavo Alonso Barrientos Sandoval ◽  
Monica Naccache ◽  
Paulo Roberto de Souza Mendes ◽  
Adriana Teixeira ◽  
...  
Keyword(s):  
Oil Emulsions ◽  
Model Oil

Design of a continuous flow immobilized-cell reactor for biosynthetical production of L-aspartic acid

1985 ◽  
Vol 50 (10) ◽  
pp. 2122-2133 ◽  
Author(s):  
Jindřich Zahradník ◽  
Marie Fialová ◽  
Jan Škoda ◽  
Helena Škodová
Keyword(s):  
Aspartic Acid ◽  
Continuous Flow ◽  
Immobilized Cells ◽  
Scale Up ◽  
Fixed Bed ◽  
Packed Bed ◽  
Fixed Bed Reactor ◽  
Experimental Program ◽  
Design Parameters ◽  
Immobilized Cell

An experimental study was carried out aimed at establishing a data base for an optimum design of a continuous flow fixed-bed reactor for biotransformation of ammonium fumarate to L-aspartic acid catalyzed by immobilized cells of the strain Escherichia alcalescens dispar group. The experimental program included studies of the effect of reactor geometry, catalytic particle size, and packed bed arrangement on reactor hydrodynamics and on the rate of substrate conversion. An expression for the effective reaction rate was derived including the effect of mass transfer and conditions of the safe conversion-data scale-up were defined. Suggestions for the design of a pilot plant reactor (100 t/year) were formulated and decisive design parameters of such reactor were estimated for several variants of problem formulation.

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