Document Type: Article All Authors / Contributors: Q Jin; L Zhou; J Li; X Wang; R Liu ISSN:0950-5423 BL Shelfmark:4542.253200 Language Note: English Unique Identifier: 801765087 Awards:
| Title | : | Shrinking core model for extraction of phenylpropanoid amides of 5-hydroxytriptamine from safflower seed meal |
| Author | : | Q Jin; L Zhou; J Li; X Wang; R Liu |
| Language | : | en |
| Rating | : | 4.90 out of 5 stars |
| Type | : | PDF, ePub, Kindle |
| Uploaded | : | Apr 12, 2021 |
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The experimental results showed that the higher concentration of citric acid was used, the higher the percentage recovery of nickel was obtained. In addition, the validity test of shrinking core model indicated a positive impact to describe physical phenomenon of leaching process.
The results of this experiment were used to evaluate the shrinking core kinetics model and the lumped model.
By studying the reducing sugar concentration versus reaction temperature (170°c–220°c) and reaction time (150–1800 s) during the hydrolysis process of five kinds of crop straw (rice, wheat, cotton, rape and corn), the shrinking core model was established, and the differential equation of the model and its analytical solution were obtained.
A shrinking core model is derived for hollow spheres that contain two regions (outer hull and inner region). The resulting analytical equations are applied to the dissolution experiments by pietersen [1, 2], yielding reaction rates at various temperatures and ph for two class f fly ashes, that are separated in solid spheres and in hollow.
Oct 6, 2020 in particular, the use of supercritical carbon dioxide as an extraction medium offers many advantages in a variety of fields, including short.
A modified shrinking core model is proposed to correlate dynamics of acid sorption on weak base ion-exchange resins in free base form. The model considers reversibility of the sorption process which is ignored in the conventional shrinking core model.
The modified shrinking core model was applied to describe the experiment results of the h2s removal reaction with zno fine particle.
Keywords: adsorption; manganese; bone char; diffusion model; shrinking core model.
Heterogeneous reaction: shell and core model aka shrinking core model aka un-reacted core model. Problem description (follows the notation used in the book cre by octave levenspiel) shell and core model: consider the case of a spherical particle over which a fluid is flowing.
In simple terms, chemical engineering deals with the production of a variety of chemicals on large scale. Large scale production is associated with the engineering problems such as fluid flow, heat and mass transfer, mixing and all types of unit operations.
The present analysis takes the effect of variable bulk solute concentration on dissolution into account. Keywords—dissolution of particles, surface layer, shrinking core model, dissolution time.
The mathematical framework of the model is based on the shrinking core model. A variable-grid, finite-difference method with fully implicit formulation is used for solving the model. It is found that the damkӧhler number 0 0 (k r ) / (d c ) da r e plays an important role in determining the nature of the diffusion/reaction dynamics.
Mathematical modelling of supercritical fluid extraction of liquid lanolin from raw the extraction model proposed is based on the shrinking-core model.
Production costs of the supercritical co2 extraction of prepressed oilseeds using a novel simulation algorithm based on the fully predictive shrinking core model.
We are interested in large particles made of many small grains where there are strong interactions between microscale granular and macroscale particulate effects, and where a shrinking core model represents behavior at the microscale level.
Oct 5, 2010 this model is based on the shrinking core model and this incorporates the surface and chemical reactivities of coal along with adsorption.
May 6, 2020 hello, im doing a research about kinetics study of lipids extraction and want to use shrinking core model for that.
Mar 10, 2016 aunt jackie's don't shrink flaxseed gel works well on all curls and a hooded dryer and allow your hair to dry completely before removal.
The purpose of this present study is to learn the effect of concentration of citric acid on the use of shrinking core kinetic model.
Table 3-2: shrinking core model fit results 38 table 3-3: number of parameters required for each model, and aard values over time calculated for all extraction curves.
This intra-particle modelling is usually done by means of the shrinking core model (scm) or one of its variants.
The core loss of magnetic components plays an important role in engineering practices. Particularly at high-frequency conditions, the loss of magnetic.
A modified shrinking core model (mscm) has been used to describe the mechanism for the degradation of protein a resin particles taking place under continuous chromatographic operation. The model is based on the hypothetical shrinkage of the boundary layer of the resin particles, which house the active protein a ligands within their pores.
So it is essential to advance a new model, which will be called as the modified shrinking core model. The mathematical models for gas-solid reaction in dense solid reactant particle, a(g) + b(s) cc(g) + dd(s). (1) the shrinking core model considered that solid reactant is dense or has very small porosity, but solid product layer is porous.
We revisit the shrinking-core model of sub-micron aluminum combustion with particular attention to the mass flux balance at the reaction front which necessarily leads to a displacement velocity of the alumina shell surrounding the liquid aluminum. For the planar problem this displacement simply leads to an equal displacement of the entire alumina layer, and therefore a straightforward.
Key word: large particles, mineral conversion, shrinking core model, heap leaching.
A new mathematical model was developed for leaching of zinc ores containing silicates such as hemimorphite which produce a gel during leaching with sulfuric acid. This model is based on the shrinking core model in which the particle size and the reacting core shrink simultaneously.
Hulbert and huff, (1970) reported that the kinetics of alumina removal from clay material could be modeled by the nucleation equation. Lai-shi et al, (2011) reported that extraction of alumina from coal fly ash is controlled by both internal diffusion and interface-chemical.
Solid particle using the shrinking core model [1] in this paper, the conversion and residence time of reaction for cylindrical particles of unchanging size during the gas – solid reaction is modeled using the shrinking core model. There are a few works in literature concerned with mathematical modeling of gas – solid reaction [1-7].
Terephthalate) (pet) is studied in the presence of an aqueous potassium hydroxide solution.
Unreacted core model for spherical particles of replacing eq 6 in 4 gives the rate of reaction in terms of the shrinking radius of unreacted.
The modified shrinking core model was applied to describe the experiment results of the h2s removal reaction with zno fine particle. The results calculated by the model equation are in good agreement with the experimental data, and the model parameters such as ks, de0 and alfa at various temperatures were also obtained.
The modified shrinking core model was used to determine the rate controlling step and it was shown that this sorption is most likely controlled by both chemical.
Shrinking core model, widely accepted in the solid-fluid non-catalytic reaction system was applied to analyze the adsorption of metal ions like zn(ii), cr(vi), cd(ii) and pb(ii) from the aqueous solutions onto the clarified sludge (cls). The diffusivities of different metal ions in clarified sludge were determined by global optimization.
2018年7月19日 in this study, subcritical water extraction (scwe) was used for dynamic extraction of crude oil of nannochloropsis salina.
Development of a more explicit model to aid in the extraction of kinetic data from the shrinking core style conversion of an iron oxide - carbon briquette.
The kinetics of aluminum leaching from sludge solid waste (ssw) using hydrochloric acid at different leaching temperatures (30 90°c) was studied.
Fig 2 shrinking core model conceptualized for direct reduction of black mass.
International centre for heat and mass transfer digital library begell house journals annual review of heat transfer.
A variation on the unreacted shrinking core model has been developed for calcination and similar non-catalytic solid-to-gas decomposition reactions in which no gaseous reactant is involved and the reaction rate decreases with increasing product gas concentration.
Kinetics study for the effect of reaction temperature leaching data fitted one shrinking core model equation.
If the slag exists in the form of droplets on the char surface rather than as a solid shell around the unreacted char particle, a shrinking particle model would be more physically realistic representation in comparison to the widely used shrinking core model (scm).
A shrinking-core model for the degradation of high-nickel cathodes (nmc811) in li-ion batteries: passivation layer growth and oxygen evolution. Research output: contribution to journal › article › peer-review.
Core model solid particle surface layer dissolution time solute yield solute molecule solute-free solid phase move variable bulk solute concentration present analysis special case undissoved portion solute-free solid phase solid-liquid interface dynamic behavior spherical particle solute-free portion outer portion temporal variation keywords.
In this paper shrinking of the phase core is modeled assuming a constant applied current at the particle surface.
Feb 1, 2016 shrinking core model for the reaction of steam with cao developed.
The kinetics of aluminum leaching from sludge solid waste (ssw) using hydrochloric acid at different leaching temperatures (30-90°c) was studied. A mathematical model was developed based on a shrinking core model by assuming first-order kinetics mechanisms for leaching and an equilibrium linear at the solid-liquid interface.
Generally, the model was developed in connection with transport and/or reaction of reactant components. In this study, commonly used internal diffusion controlled shrinking core model was evaluated for leaching process of pomalaa nickel laterite using citric acid as leachant.
The model bridges the 'broken and intact cells' and the 'shrinking-core' models available in the literature: as the former, the proposed model takes into account.
Shrinking core model, a new model describing bioleaching of the black shale type ore in a column is proposed. The model is based on assumption of dependence of copper recovery and surface area increase during the process. Key words: bioleaching, shrinking core model, black shale introduction.
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