Effect of geometric parameters of liquid-gas separator units on phase separation performance

2015 ◽  
Vol 32 (7) ◽  
pp. 1243-1248 ◽  
Author(s):  
Songping Mo ◽  
Xueqing Chen ◽  
Ying Chen ◽  
Zhen Yang
Keyword(s):  
Phase Separation ◽  
Geometric Parameters ◽  
Separation Performance ◽  
Gas Separator

scholarly journals Designing of a novel polyvinylidene fluoride/TiO2/UiO-66-NH2 membrane with photocatalytic antifouling properties using modified zirconium-based metal-organic framework

2021 ◽  
Author(s):  
Yi-Jing Li ◽  
Gui-E Chen ◽  
Lian-Jing Liu ◽  
Zhen-Liang Xu ◽  
Sun-Jie Xu ◽  
...  
Keyword(s):  
Phase Separation ◽  
Bovine Serum Albumin ◽  
Polyvinylidene Fluoride ◽  
Metal Organic Framework ◽  
Rejection Rate ◽  
Separation Performance ◽  
Recovery Ratio ◽  
Quantitative Measurements ◽  
Metal Organic ◽  
Bsa Rejection

Abstract Novel polyvinylidene fluoride/TiO2/UiO-66-NH2 (PVDF/TiUN) membranes were produced by the delay phase separation method via introducing the TiO2/UiO-66-NH2 (TiUN) nanocomposite into PVDF casting solution. Interconnection of TiO2 and UiO-66-NH2 improved photocatalysis capacity and endowed PVDF/TiUN membranes with self-cleaning capability. Quantitative measurements showed that, firstly, PVDF/TiUN membranes exhibited improved photodegradation kinetics and efficiency (up to 88.1%) to Rhodamine B (RhB). Secondly, the performances of bovine serum albumin (BSA) rejection and permeation of PVDF/TiUN membranes outperformed those of other check samples, indicating enhanced hydrophilicity. Thirdly, rejection rate of BSA reached to breathtaking 98.14% and flux recovery ratio (FRR) of BSA reached breathtaking 95.37%. Thus, given their excellent anti-contamination property and separation performance, the PVDF/TiUN membrane is very likely to be a novel water treatment membrane.

scholarly journals Phase separation of multiphase droplets in a digital microfluidic device

2019 ◽  
Vol 7 (1) ◽  
Author(s):  
Mun Mun Nahar ◽  
Hyejin Moon
Keyword(s):  
Phase Separation ◽  
Capillary Number ◽  
Digital Microfluidics ◽  
Separation Performance ◽  
Comprehensive Investigation ◽  
Electrowetting On Dielectric ◽  
Splitting Technique ◽  
Droplet Splitting ◽  
Two Phases ◽  
Digital Microfluidic

Abstract This study reports the first comprehensive investigation of separation of the immiscible phases of multiphase droplets in digital microfluidics (DMF) platform. Electrowetting-on-dielectric (EWOD) actuation has been used to mechanically separate the phases. Phase separation performance in terms of percentage residue of one phase into another phase has been quantified. It was conceived that the residue formation can be controlled by controlling the deformation of the phases. The larger capillary number of the neck forming phase is associated with the larger amount of deformation as well as more residue. In this study, we propose two different ways to control the deformation of the phases. In the first method, we applied different EWOD operation voltages on two phases to maintain equal capillary numbers during phase separation. In the second method, while keeping the applied voltages same on both sides, we tested the phase separation performance by varying the actuation schemes. Less than 2% of residue was achieved by both methods, which is almost 90% improvement compared to the phase separation by the conventional droplet splitting technique in EWOD DMF platform, where the residue percentage can go up to 20%.

scholarly journals Study on cleaning solvents using activated alumina in PUREX process

2011 ◽  
Vol 1 (1) ◽  
pp. 71-74
Author(s):  
Y. Arai ◽  
H. Ogino ◽  
M. Takeuchi ◽  
T. Kase ◽  
Y. Nakajima
Keyword(s):  
Phase Separation ◽  
Tributyl Phosphate ◽  
Spent Nuclear Fuel ◽  
Degradation Products ◽  
Purex Process ◽  
Separation Performance ◽  
Activated Alumina ◽  
Alkali Solutions ◽  
Cleaning Solvents ◽  
Separation Test

Abstract The PUREX process is used to extract uranium and plutonium from dissolved solutions (spent nuclear fuel liquor). The extractant is 30% tributyl phosphate in n-dodecane, which is known to be degradable by radiation and nitric acid. Tributyl phosphate degradation products can generally be washed in alkali solutions like sodium carbonate solution; however, it is more difficult to remove n-dodecane degradation products using this method. A method of cleaning solvents using activated alumina is discussed in this study. A degradation sample of 30% TBP/n-dodecane was prepared by irradiating (1.6 MGy) with a 60Co gamma-source. The degradation products were then qualitatively analyzed using a gas chromatography-mass spectrometer (GC-MS). After being irradiated the solvents were cleaned with activated alumina, and a phase separation test with performed in evaluating the cleaned solvent. This resulted in the discovery of a procedure for the removal of n-dodecane degradation products of dodecanol and dodecanone, with about 70% of the degradation products, and the phase separation performance could be clearly improved through use of activated alumina.

scholarly journals A Novel Anion Exchange Membrane for Bisulfite Anion Separation by Grafting a Quaternized Moiety through BPPO via Thermal-Induced Phase Separation

2020 ◽  
Vol 21 (16) ◽  
pp. 5782
Author(s):  
Md Mofasserul Alam ◽  
Yaoming Wang ◽  
Chenxiao Jiang ◽  
Tingting Xu ◽  
Yahua Liu ◽  
...  
Keyword(s):  
Phase Separation ◽  
Anion Exchange ◽  
Membrane Surface ◽  
Separation Performance ◽  
Anion Exchange Membranes ◽  
Transmission Electron ◽  
Alkali Medium ◽  
Core Elements ◽  
Anion Separation ◽  
Exchange Membrane

Ion-exchange membranes are the core elements for an electrodialysis (ED) separation process. Phase inversion is an effective method, particularly for commercial membrane production. It introduces two different mechanisms, i.e., thermal induced phase separation (TIPS) and diffusion induced phase separation (DIPS). In this study, anion exchange membranes (AEMs) were prepared by grafting a quaternized moiety (QM,2-[dimethylaminomethyl]naphthalen-1-ol) through brominated poly (2,6-dimethyl-1,4-phenylene oxide) (BPPO) via the TIPS method. Those membranes were applied for selective bisulfite (HSO3−) anion separation using ED. The membrane surface morphology was characterized by SEM, and the compositions were magnified using a high-resolution transmission electron microscope (HRTEM). Notably, the membranes showed excellent substance stability in an alkali medium and in grafting tests performed in a QM-soluble solvent. The ED experiment indicated that the as-prepared membrane exhibited better HSO3− separation performance than the state-of-the-art commercial Neosepta AMX (ASTOM, Japan) membrane.

scholarly journals Integrated Clarification and Purification of Monoclonal Antibodies by Membrane Based Separation of Aqueous Two-Phase Systems

Antibodies ◽  
2019 ◽  
Vol 8 (3) ◽  
pp. 40 ◽  
Author(s):  
Thomas Kruse ◽  
Axel Schmidt ◽  
Markus Kampmann ◽  
Jochen Strube
Keyword(s):  
Monoclonal Antibodies ◽  
Phase Separation ◽  
Chinese Hamster ◽  
Contact Angles ◽  
Cell Protein ◽  
Phase System ◽  
Separation Performance ◽  
Downstream Process ◽  
Two Phase ◽  
Cultivation Broth

Therapeutic monoclonal antibodies (mAb) are used for the treatment of numerous serious diseases, which have led to an increasing demand over the last decades. Increased cell density and mAb titer of the cultivation broth lead to great challenges for the subsequent clarification and capture operations in the downstream process. As an alternative approach to the conventional downstream process, a selective mAb extraction via an aqueous two-phase system (ATPS) directly from the cultivation broth of a mAb producing industrial relevant chinese hamster ovary (CHO) cell line was investigated. An efficient purification of the mAb was accomplished by the ATPS composition. The phase separation was realized by a newly developed membrane based phase separator. Moreover, a complete cell removal was integrated into this process by the used membrane. A selectivity between both phases was achieved by membrane modification. Yields up to 93% in the light phase and removal of process related impurities were obtained after aqueous two-phase extraction (ATPE). Phase separation performance as well as contact angles on the membrane were characterized for different ATPS. ATPE directly from the cultivation broth in combination with the new membrane based phase separation led to a mAb yield of 78% with a simultaneous reduction of deoxyribonucleic acid (DNA) and host cell protein (HCP) load.

Numerical Simulation on the Effect of Inlet-Collision in Oil-Gas Separator Used for Air-Conditioning System

2013 ◽  
Vol 448-453 ◽  
pp. 3378-3381
Author(s):  
Jian Jun Meng ◽  
Yi Luo ◽  
Gang Yan ◽  
Jian Mei Feng
Keyword(s):  
Air Conditioning ◽  
Separation Efficiency ◽  
Three Dimensional ◽  
Separation Performance ◽  
Gas Field ◽  
Pipe Length ◽  
Air Conditioning System ◽  
Inlet Velocity ◽  
Gas Separator ◽  
Oil Gas

A three-dimensional steady-state numerical model of oil-gas separator with inlet-collision structure used in small-sized Variable Refrigerant Flow (VRF) system was established. RNG k-ε model was used in gas field and DRW model was chosen for oil droplets tracking. The influence of inlet-collision on velocity distribution, separation efficiency and pressure loss were studied. The results showed that the inlet-collision structure which had smaller radio of inner pipe length to cyclone bodys height could achieve the same separation efficiency as the no inlet-collision structure with bigger cyclone diameter. Higher separation performance could be obtained when the inlet-collision proportion was less than 26.57% and inlet velocity was about 24 m·s-1.

scholarly journals Experimental Investigation of the Gas/Liquid Phase Separation Using a Membrane-Based Micro Contactor

2018 ◽  
Vol 2 (4) ◽  
pp. 55 ◽  
Author(s):  
Kay Marcel Dyrda ◽  
Vincent Wilke ◽  
Katja Haas-Santo ◽  
Roland Dittmeyer
Keyword(s):  
Phase Separation ◽  
Liquid Phase ◽  
Pressure Gradient ◽  
Separation Efficiency ◽  
Gas Permeability ◽  
Separation Process ◽  
Methanol Solution ◽  
Liquid Phase Separation ◽  
Separation Performance ◽  
Membrane Area

The gas/liquid phase separation of CO2 from a water-methanol solution at the anode side of a µDirect-Methanol-Fuel-Cell (µDMFC) plays a key role in the overall performance of fuel cells. This point is of particular importance if the µDMFC is based on a “Lab-on-a-Chip” design with transient working behaviour, as well as with a recycling and a recovery system for unused fuel. By integrating a membrane-based micro contactor downstream into the µDMFC, the efficient removal of CO2 from a water-methanol solution is possible. In this work, a systematic study of the separation process regarding gas permeability with and without two-phase flow is presented. By considering the µDMFC working behaviour, an improvement of the overall separation performance is pursued. In general, the gas/liquid phase separation is achieved by (1) using a combination of the pressure gradient as a driving force, and (2) capillary forces in the pores of the membrane acting as a transport barrier depending on the nature of it (hydrophilic/hydrophobic). Additionally, the separation efficiency, pressure gradient, orientation, liquid loss, and active membrane area for different feed inlet temperatures and methanol concentrations are investigated to obtain an insight into the separation process at transient working conditions of the µDMFC.

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