Process intensification of foam fractionation by successive contraction and expansion

2011 ◽  
Vol 89 (11) ◽  
pp. 2298-2308 ◽  
Author(s):  
Xueliang Li ◽  
Geoffrey M. Evans ◽  
Paul Stevenson
Keyword(s):  
Process Intensification ◽  
Foam Fractionation ◽  
Contraction And Expansion ◽  
Successive Contraction

scholarly journals Exclusion process subject to conformational size changes

2019 ◽  
Vol 6 (6) ◽  
Author(s):  
Yvan Rousset ◽  
Luca Ciandrini ◽  
Norbert Kern
Keyword(s):  
Excellent Agreement ◽  
Current Density ◽  
Molecular Motors ◽  
Exclusion Process ◽  
One Dimensional ◽  
Stochastic Transport ◽  
Density Relation ◽  
Contraction And Expansion ◽  
Successive Contraction

We introduce a model for stochastic transport on a one-dimensional substrate with particles assuming different conformations during their stepping cycles. These conformations correspond to different footprints on the substrate: in order to advance, particles are subject to successive contraction and expansion steps with different characteristic rates. We thus extend the paradigmatic exclusion process, provide predictions for all regimes of these rates that are in excellent agreement with simulations, and show that the current-density relation may be affected considerably. Symmetries are discussed, and exploited. We discuss our results in the context of molecular motors, confronting a hand-over-hand and an inchworm stepping mechanism, as well as for ribosomes.

scholarly journals Separation of Protein-Binding Anthraquinones from Semen Cassiae Using Two-Stage Foam Fractionation

Processes ◽  
2019 ◽  
Vol 7 (7) ◽  
pp. 463 ◽  
Author(s):  
Linlin Ding ◽  
Yanyan Wang ◽  
Chuanjun Yue ◽  
Zeying Wu ◽  
Ye Sun ◽  
...  
Keyword(s):  
Protein Binding ◽  
Radical Scavenging Activity ◽  
Radical Scavenging ◽  
Process Intensification ◽  
Enrichment Ratio ◽  
Foam Fractionation ◽  
Feed Concentration ◽  
Two Stage ◽  
Total Recovery ◽  
Medicinal Value

Anthraquinones are compounds of high medicinal value in many plants. Based on their good protein binding affinity, foam fractionation was attempted to separate them using proteins in the aqueous extract of Semen Cassiae as collectors. Firstly, the interaction between anthraquinones and Semen Cassiae proteins has been analyzed by the Stem–Volmer equation with physcion as a standard. The results show that physcion had good interaction with the proteins via hydrophobic forces. More importantly, the proteins effectively assisted the foam fractionation of several anthraquinones including aurantio-obtusifolin, aloe-emodin, rhein, emodin, chrysophanol, and physcion. On this basis, a two-stage foam fractionation technology was developed for process intensification using a foam fractionation with vertical sieve trays (VSTs). VSTs, initial feed concentration of total anthraquinones, temperature, volumetric air flow rate and pore diameter of gas distributor had significant effects on enrichment ratio and recovery yield of anthraquinones. Under suitable conditions, the enrichment ratio of total anthraquinones reached 47.0 ± 4.5 with a concentration of 939 ± 94 mg/L in the foamate while their total recovery percentage reached more than 47.7%. In addition, foam fractionation also increased the purity and hydroxyl radical scavenging activity of total anthraquinones. The results had significant implications for the separation of anthraquinones from Semen Cassiae.

The Chemical Decontamination Process Intensification, using Ultrasounds

2008 ◽  
Vol 59 (9) ◽  
Author(s):  
Eugenia Pantru ◽  
Gheorghit Jinescu ◽  
Rozalia R�dulescu ◽  
Antoneta Filcenco Olteanu ◽  
Cosmin Jinescu
Keyword(s):  
Chemical Composition ◽  
Process Intensification ◽  
Sulphuric Acid Solution ◽  
Liquid Ratio ◽  
Polluted Soils ◽  
Chemical Decontamination ◽  
First Case ◽  
Ultrasound Field ◽  
Different Types ◽  
Main Factors

This paper presents an intensive procedure used for the decontamination of the soils, which were radioactively contaminated by uranium, due to the occurrence of some antropic accidents, in order to limit the area�s pollution. The procedure used for the chemical decontamination of the polluted soils was the washing one and the decontamination degree is comparatively presented depending on the ultrasounds� presence and absence. The lab testes were performed on five types of soils , which were characterized from the granulometric, structural and chemical composition viewpoint, all these aspects represent the main factors, which determine the applied decontamination procedure�s limits and performances correlated with its utilization costs. The decontamination procedure�s kinetics for each type of soils was analyzed, using successively three different types of reagents (water, 0.1 M sulphuric acid solution and chloro-sodic solution � 100 g/L sodium chloride + 10 g/L sodium carbonate in water) for a solid to liquid ratio of 1:2, during 2 h, at a temperature of 20oC in a mechanic stirring system respectively in ultrasounds field. It was observed that the decontamination degree increases with up to 15-20% in case of the ultrasound field utilization comparing to the first case.

Sign in / Sign up

Export Citation Format

Share Document