قائمة الطعام
Abstract. The deoiling process is a critical issue in catalyst regeneration and recovery of precious metals from spent catalysts. This study developed a fast and …
ABSTRACT OF THE DISCLOSURE An improved deoiling process is provided for removing substantial amounts of oil from spent catalyst withdrawn from resid hydrotreating units. In the pro-cess, a slurry of spent catalyst and oil is spirally con-veyed at an upward angle of inclination in a spiral clas-sifier. Oil is drained from the upwardly spiraling slurry …
In some cases, addition of surfactants followed by thermal treatment enhances the deoiling process and increases percentage of oil recovery. ... In another work conducted by Wang et al., ZSM-5 zeolites were applied as catalysts to endorse the aromatization during pyrolysis of oily sludge. The overall aromatic yield and product …
The four-stage deoiling process was then carried out, resulting in the discharge of the deoiled particles from the underflow. Meanwhile, the air flow containing water vapor, oily microdroplets, and a small amount of vaporized oil-phase substances was discharged from the overflow. ... Deoiling of oil-coated catalyst using high-speed …
In the deoiling process, higher shear stress rates promoted faster transport of oil from catalysts into the fluid, thereby increasing the deoiling efficiency. …
Numerical results were compared with experimental data. In the deoiling process, higher shear stress rates promoted faster transport of oil from catalysts into the fluid, thereby increasing the deoiling efficiency. Deoiling by the shear stress of a hydrocyclone is an efficient method for cleaning oil‐contaminated catalysts within a short …
Abstract. Deoiling process is a key issue for recovering metal values from spent hydrotreating catalysts. The oils can be removed with organic solvents, but the …
The deoiling process is a critical issue in catalyst regeneration and recovery of precious metals from spent catalysts. This study developed a fast and efficient method to recover crude oil from spent hydrodesulphurization (HDS) catalysts. ... During the petroleum refining process, spent catalysts adhere to many crude oil fractions (15–60 wt
XRD data show that the structure of the catalyst support was unaltered by the solvent treatment process, while BET data reveals that the surface area and pore volume are significantly enhanced after the deoiling process. These results imply that deoiling …
In the catalytic oxidation process with CAO as the catalyst, the deoiling effect was continuously better than that of SOP or NAO at pH 3–11, indicating that ·OH had been playing a dominant role and also indicating that the CAO catalyst could adapt to both acid and alkali environment. ... catalyst preparation process (Figure S1 ...
@article{osti_6092153, title = {Dewaxing by a combination centrifuge/catalytic process including solvent deoiling}, author = {Hafez, M M}, abstractNote = {A hydrocarbon dewaxing process comprising the steps of: (a) chilling the waxy hydrocarbon feed to be dewaxed in the absence of solvent to crystallize a portion of the hard wax; (b) introducing …
Deoiling process is a key issue for recovering metal values from spent hydrotreating catalysts. The oils can be removed with organic solvents, but the …
Last but not least, the oil attached on the surface of spent HDT catalysts can obstruct liquid phase contacting with solid surface (Xu et al., 2016), which makes it impossible to recover metals from spent HDT catalysts by direct chemical extraction process. Therefore, deoiling enjoys great significance in metal recycling and landfill of …
Abstract Small diameter (10 mm) hydrocyclone is used for catalyst particles separations in this work. An industrial sidetrack tester was set up in 1.8 Mt/a catalytic cracking unit. When Reynolds number is invariable, the experimental results show that the pressure drop between the inlet and the overflow is not changed by changes in the split ratio. The …
Numerical results were compared with experimental data. In the deoiling process, higher shear stress rates promoted faster transport of oil from catalysts into the fluid, thereby increasing the deoiling efficiency. Deoiling by the shear stress of a hydrocyclone is an efficient method for cleaning oil-contaminated catalysts within a short …
Numerical results were compared with experimental data. In the deoiling process, higher shear stress rates promoted faster transport of oil from catalysts into the fluid, thereby increasing the deoiling efficiency. Deoiling by the shear stress of a hydrocyclone is an efficient method for cleaning oil‐contaminated catalysts within a short time.
deoiling process. These results imply that deoiling is a very crucial step for the recycling, regeneration, and reuse of spent catalysts. Our work is significant in developing …
The deoiling process has been successfully achieved by hydrothermal method with addition of surfactant. The hydrothermal method is easy to operate and low cost. However, the surfactant is very easy to adsorb on the surface of the catalyst to cause secondary pollution. ... The main compositions of spent HDT catalyst after deoiling are …
A deoiling process is described comprising the steps of: removing a slurry of spent catalyst and oil from an ebullated bed reactor; transporting the slurry of spent catalyst …
After the deoiling process, the spent catalyst was analyzed by scanning electron microscopy, X-ray diffraction (XRD), Fourier transform-infrared spectroscopy, elemental analyzer, contact angle ...
And then, 20 g spent catalyst CoMo/Al 2 O 3 was removed in alkaline SDS solutions with different concentrations in a 500 ml, three-necked and round-bottomed flask. The flask coupled with a condenser was placed in a water bath with a stirrer (Chao Yue, DF-101S). The deoiling process was conducted at an agitation speed of 200 rpm. …
The possibility of producing semi-purified and deeply deoiled paraffins from slack waxes by the method of static crystallization is investigated. Optimal parameters of a one-stage deoiling process for obtaining semi-purified paraffins with an oil content of less than 3 wt% were determined. The potential of a two-stage deoiling process for …
The self-rotation speed and suspending time of catalyst particles can be enhanced by the increase of inlet flux and cone angle. The coating oil is removed under the periodic resultant centrifugal force when the suspending time is prolonged, and the oil content can be reduced from 36.17% to less than 4% within 100 s in cyclone under 25 °C.
Wax De-oiling. Wax Deoiling is valuable process for refineries, processing Waxy Crude and looking for improvement in Gross Refinery Margin (GRM). CSIR IIP has facilities for investigation of different available refinery waxy streams for the production of marketable grades of paraffin waxes. Typical steps involved in Wax Deoiling …
Based on the conventional method of hot water extraction, Li et al. [21] developed a hot water cyclonic extraction process, involving the intensified deoiling of the oil-bearing catalyst through the high-speed self-rotation of particles in the cyclone.
Thermodynamic process design; Determination of substance properties for further processing; Design and dimensioning of a complete dewaxing/deoiling plant incl. required off-sites; EDL and Sulzer offer the most efficient solution - the free selection of the process (with or without solvent) or a combination of both technologies.
The possibility of recycling of total spent catalyst (TSC) was studied using various steps such as deoiling, drying, grinding, sieving, and decoking. In the subsequent steps, the digested spent ...
Semantic Scholar extracted view of "Deoiling of oil-coated catalyst using high-speed suspending self-rotation in cyclone" by Dai Shi et al. ... The process of washing and removing crude oil from spent catalysts is a serious issue in both catalyst regeneration and precious metals recovery.
Deoiling process is a key issue for recovering metal values from spent hydrotreating catalysts. The oils can be removed with organic solvents, but the industrialized application of this method is greatly hampered by the high cost and complex processes. ... The deoiling process is a critical issue in catalyst regeneration and …
The deoiling process is a critical issue in catalyst regeneration and recovery of precious metals from spent catalysts. This study developed a fast and …
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