scholarly journals Bulk Liquid Membranes for Separation and Recovery of Pharmaceutical Products

2018 ◽  
Vol 69 (11) ◽  
pp. 3257-3260
Author(s):  
Ecaterina Anca Serban ◽  
Ioana Diaconu ◽  
Elena Ruse ◽  
Gheorghe Batrinescu ◽  
Gheorghe Nechifor ◽  
...  
Keyword(s):  
Nicotinic Acid ◽  
Optimal Transport ◽  
Transport Model ◽  
Pharmaceutical Products ◽  
Bulk Liquid ◽  
Analytical Control ◽  
Aliquat 336 ◽  
Aminobenzoic Acid ◽  
Transport Time ◽  
Feed Phase

In this present paper the behavior of two important pharmaceutical compounds, namely: nicotinic acid (vitamin PP/B3) and para-aminobenzoic acid (vitamin B10) to the transport through a liquid membrane of chloroform containing Aliquat 336 have been studied. The influence of operational parameters such as: solute concentration in the feed phase, stripping agent concentration in the stripping phase, transport time was monitored. The assessment of the obtained results allowed establishing of optimal transport conditions as well as identification of a kinetic transport model for nicotinic acid corresponding to consecutive irreversible 1st order reactions. The maximum transport efficiency was 96% and it was obtained at a concentration of 10-4 mol/L nicotinic acid in the feed phase and a concentration of 1 mol/L sodium hydroxide in the stripping phase. The transport time necessary to achieve this efficiency was 6 h. The results obtained led to important conclusions regarding the possibility of separating these two compounds. Analytical control of the process was done spectrophotometrically. The maximum absorbance was obtained at their characteristic wavelengths, namely 262 nm for nicotinic acid and respectively 267 nm for para-aminobenzoic acid.

Evaluation of Kinetic Parameters at the Transport of Indole-3-acetic Acid Through Bulk Liquid Membranes

2017 ◽  
Vol 68 (5) ◽  
pp. 903-907
Author(s):  
Ecaterina Anca Serban ◽  
Ioana Diaconu ◽  
Elena Ruse ◽  
Georgiana Ileana Badea ◽  
Adriana Cuciureanu ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Kinetic Parameters ◽  
Trioctylphosphine Oxide ◽  
Bulk Liquid ◽  
Transport Parameters ◽  
Kinetics Parameters ◽  
First Order ◽  
Phase Concentration ◽  
Feed Phase ◽  
Indole 3 Acetic Acid

Indole-3-acetic acid is a growth phytohormone considered the most important representative of auxin class. This paper presents the assessment of some kinetic parameters in the process of transport of indole-3-acetic acid taking into consideration the kinetic model of consecutive irreversible first order reactions. It was pursued the influence upon the process of parameters such as: feed phase concentration, stripping phase concentration in the presence of two type carriers: tributyl phosphate (TBP) and trioctylphosphine oxide (TOPO). Depending on these transport parameters were calculated kinetics parameters such as: pseudo-first-order apparent membrane entrance and exit rate constants, the maximum flux at the entrance and exit out of the membrane. The highest values of the transport flux is obtained in the presence of carrier trioctylphosphine oxide (TOPO) at the concentration in the feed phase of 10-4 mol/L indole-3-acetic acid and a concentration of 10--2mol/L NaOH in the stripping phase.

scholarly journals PENAMBAHAN ASAM OLEAT TERHADAP Sistem transpor Cu(II) dengan zat pembawa oksin melalui teknik membran cair fasa ruah

2015 ◽  
Vol 2 (1) ◽  
pp. 45
Author(s):  
Olly Norita Tetra ◽  
Zaharasmi ◽  
Refinel
Keyword(s):  
Aqueous Solutions ◽  
Liquid Membrane ◽  
Bulk Liquid ◽  
Optimum Conditions ◽  
Membrane Phase ◽  
Bulk Liquid Membrane ◽  
Phase 0 ◽  
Interface System ◽  
Source Phase ◽  
Feed Phase

 ABSTRACT The removal of Cu(II) from aqueous solutions had been employed throught bulk liquid membrane techniques with arrange the optimization conditions of transport Cu(II) interface system. The optimum conditions of transport were found to be 3.1510-4 M of Cu(II) at pH 3  in the source phase,  17.510-4 M oxine dissolved into chloroform as membrane phase, 0,15 M H2SO4 as acceptor in  receiving phase, stirring rate was 340 rpm and  it was found that the transport of Cu(II) to receiving phase reached 97.41% during 6 hours. The effect of addition  oleat acid 1.57  10-3 M as surfactant  in membrane phase resulted a rapidly time of  transport Cu(II) to be 3 hours, wherein Cu(II) transported  into  the receive phase reached 97.83%  and remained  in feed phase 0%. Keywords: bulk liquid membrane, oxine, oleat acid, Cu(II) )transport

scholarly journals SEPARATION OF CHROM (VI) FROM ELECTROPLATING WASTE USING POLYMER INCLUSION MEMBRANE (PIM) METHOD

2017 ◽  
Vol 13 (1) ◽  
pp. 119 ◽  
Author(s):  
Muhammad Cholid Djunaidi ◽  
Khabibi Khabibi ◽  
Rizka Nurfitriana
Keyword(s):  
Metal Ion ◽  
Membrane Surface ◽  
Separation Process ◽  
Ion Concentration ◽  
Aliquat 336 ◽  
Nacl Solution ◽  
Chromium Ion ◽  
Chromium Vi ◽  
Base Polymer ◽  
Feed Phase

<p><span lang="EN-US">Research of chromium (VI) separation has been done using </span><span lang="EN-US">p</span><span lang="EN-US">olymer </span><span lang="EN-US">i</span><span lang="EN-US">nclusion </span><span lang="EN-US">m</span><span lang="EN-US">embrane (PIM) method. This study aims to generate PIM, separate the metal ion chromium (VI) using PIM and determine the effect of the concentration of the feed phase, the thickness of the membrane and the amount of usage of the membrane for ion chromium (VI) diffusion.</span><span lang="EN-US">Polymer </span><span lang="EN-US">i</span><span lang="EN-US">nclusion </span><span lang="EN-US">m</span><span lang="EN-US">embrane (PIM) was made by mixing Aliquat 336-TBP as carrier compounds, PVC as the base polymer, DBE as a plasticizer and THF as a solvent. PIM membrane was placed between the source of analyte as a feed phase and result of the separation as a receiver phase. Feed phase was electroplating waste metal containing chromium (VI) at pH 4, while the receiver phase was a 2 N NaCl solution with a pH 6.7. </span>The change of v<span lang="EN-US">ariable</span>s<span lang="EN-US"> in this study </span>were<span lang="EN-US"> the concentration of the feed phase </span>at various dilution i.e.,<span lang="EN-US"> 100x, 50x and 10x, the thickness of the membrane i.e., 25 μm, 20 μm and 10 μm</span>,<span lang="EN-US"> and the </span>time of <span lang="EN-US">membrane</span> using i.e.,<span lang="EN-US"> 1, 2 and 3 times. The concentration of chromium (VI) diffused after separation process </span>was<span lang="EN-US"> analyzed </span>by <span lang="EN-US">a</span><span lang="EN-US">tomic </span><span lang="EN-US">a</span><span lang="EN-US">bsorption </span><span lang="EN-US">s</span><span lang="EN-US">pectroscopy (AAS). </span>T<span lang="EN-US">he stability of membrane was observed </span>by analyzing the presence of<span lang="EN-US"> membrane</span>’s<span lang="EN-US"> component </span>in the<span lang="EN-US"> feed</span> phase<span lang="EN-US"> and </span>in the <span lang="EN-US">receiver phase</span>. The analysis was conducted by UV-Vis <span lang="EN-US">spectrophotometry</span>. Meanwhile, s<span lang="EN-US">canning </span><span lang="EN-US">e</span><span lang="EN-US">lectron </span><span lang="EN-US">m</span><span lang="EN-US">icroscopy (SEM) </span>analysis was used <span lang="EN-US">to determine the morphology of membrane surface.</span><span lang="EN-US">The results showed that the chromium ion concentration </span>diffused<span lang="EN-US"> from the feed phase was 99.24</span><span lang="EN-US">%</span>, mean<span lang="EN-US">while the 85.88</span><span lang="EN-US">%</span> of it diffused to the receiving phase<span lang="EN-US">. The highest Cr(VI)</span> ions<span lang="EN-US"> diffus</span>ion was occured at<span lang="EN-US"> the first use of PIM membrane with a thickness of 10 μm and the concentration of the feed phase</span> was<span lang="EN-US"> 10.55 ppm</span> (resulted from 100 times dilution)<span lang="EN-US">. </span>Therefore, i<span lang="EN-US">t can be concluded that the diffusion of chromium (VI) ion was influenced by the concentration of feed phase, the thickness of membrane and </span>the number of membrane application<span lang="EN-US">.</span></p>

scholarly journals Joint Partial Optimal Transport for Open Set Domain Adaptation

2020 ◽  
Author(s):  
Renjun Xu ◽  
Pelen Liu ◽  
Yin Zhang ◽  
Fang Cai ◽  
Jindong Wang ◽  
...  
Keyword(s):  
Optimal Transport ◽  
Transport Model ◽  
Domain Adaptation ◽  
General Setting ◽  
Feature Space ◽  
Set Domain ◽  
Target Domain ◽  
Source Domain ◽  
Open Set ◽  
Proposed Model

Domain adaptation (DA) has achieved a resounding success to learn a good classifier by leveraging labeled data from a source domain to adapt to an unlabeled target domain. However, in a general setting when the target domain contains classes that are never observed in the source domain, namely in Open Set Domain Adaptation (OSDA), existing DA methods failed to work because of the interference of the extra unknown classes. This is a much more challenging problem, since it can easily result in negative transfer due to the mismatch between the unknown and known classes. Existing researches are susceptible to misclassification when target domain unknown samples in the feature space distributed near the decision boundary learned from the labeled source domain. To overcome this, we propose Joint Partial Optimal Transport (JPOT), fully utilizing information of not only the labeled source domain but also the discriminative representation of unknown class in the target domain. The proposed joint discriminative prototypical compactness loss can not only achieve intra-class compactness and inter-class separability, but also estimate the mean and variance of the unknown class through backpropagation, which remains intractable for previous methods due to the blindness about the structure of the unknown classes. To our best knowledge, this is the first optimal transport model for OSDA. Extensive experiments demonstrate that our proposed model can significantly boost the performance of open set domain adaptation on standard DA datasets.

scholarly journals Removal of Acetaminophen Residues from Wastewater by Bulk Liquid Membrane Process

2020 ◽  
Vol 21 (4) ◽  
pp. 1-9
Author(s):  
Sawsan Abd Muslim Mohammed Albasri ◽  
Husna Salim Wahab
Keyword(s):  
Activation Energy ◽  
Carrier Concentration ◽  
Extraction Efficiency ◽  
Liquid Membrane ◽  
Volume Ratio ◽  
Bulk Liquid ◽  
Membrane Phase ◽  
Bulk Liquid Membrane ◽  
Nacl Concentration ◽  
Feed Phase

   The removal of Anit-Inflammatory drugs, namely; Acetaminophen (ACTP), from wastewater by bulk liquid membrane (BLM) process using Aliquat 336 (QCl) as a carrier was investigated. The effects of several parameters on the extraction efficiency were studied in this research, such as the initial feed phase concentration (10-50) ppm of ACTP, stripping phase (NaCl) concentration (0.3,0.5,0.7 M), temperature (30-50oC), the volume ratio of feed phase to membrane phase (200-400ml/80ml), agitation speed of the feed phase (75-125 rpm), membrane stirring speed (0, 100, 150 rpm), carrier concentration (1, 5, 9 wt%), the pH of feed (2, 4, 6, 8, 10), and solvent type (CCl4 and n-Heptane). The study shows that high extraction efficiency for ACTP of about 97% was achieved by a bulk liquid membrane at 50 ppm initial concentration of feed; stirring speed of feed phase 130 rpm; stirring speed of membrane phase 100rpm; 0.5 M NaCl concentration; carrier concentration 1wt%; volume ratio of 200ml feed:80ml membrane; feed pH of ACTP is 6,  and 50˚C. The transport kinetics was evaluated using a kinetic model with two consecutive first-order irreversible reactions. The kinetics of (ACTP) transport by bulk liquid membrane was investigated at the best experimental conditions. The activation energy values of the extraction and stripping processes were 1.733 and 1.826 kJ.mol−1. The activation energy confirms that the transport process from solutions is controlled by diffusion.

scholarly journals Determining an optimal transport velocity in the marginal ice zone using operational ice-ocean prediction systems

2021 ◽  
Author(s):  
Graig Sutherland ◽  
Victor Aguiar ◽  
Lars-Robert Hole ◽  
Jean Rabault ◽  
Mohammed Dabboor ◽  
...  
Keyword(s):  
Optimal Transport ◽  
Transport Model ◽  
The Arctic ◽  
Transport Models ◽  
Mean Velocity ◽  
Abstract Knowledge ◽  
Marginal Ice Zone ◽  
Surface Drifters ◽  
General Transport ◽  
The Right

Abstract. Knowledge of transport in the marginal ice zone (MIZ) is critical for operations in the Arctic and associated emergency response applications, for example, the transport of pollutants, such as oil, as well as predicting drift associated with search and rescue operations. This paper proposes a general transport equation for the MIZ that can be used for operational purposes in the MIZ. This equation is designed to use a mean velocity of the ice and water velocity, which is weighted by the ice concentration. A key component is the introduction of a leeway coefficient for both the ocean and ice components. These leeway coefficients are determined by minimizing the velocity error between the transport model and observed drifter velocity in the MIZ. These leeway values are found to be 3 % of the wind for the water leeway and 2 % and 30° to the right of the wind for the ice leeway, which are consistent with "rule of thumb" values for surface drifters and sea ice respectively. This general transport model is compared with other transport models and the error is reduced by a factor of 2 compared with traditional transport models for 48 hour lead times. The inclusion of a leeway coefficient in the ice is the key component to reduce trajectory errors in the MIZ.

Vapor pressure and sublimation thermodynamics of aminobenzoic acid, nicotinic acid, and related amido-derivatives

2015 ◽  
Vol 123 (1) ◽  
pp. 841-849 ◽  
Author(s):  
Tatyana V. Volkova ◽  
Svetlana V. Blokhina ◽  
Alex M. Ryzhakov ◽  
Angelica V. Sharapova ◽  
Marina V. Ol’khovich ◽  
...  
Keyword(s):  
Vapor Pressure ◽  
Nicotinic Acid ◽  
Aminobenzoic Acid ◽  
Sublimation Thermodynamics

Extraction Process of L-Theanine across Aiquat 336-Kerosene Bulk Liquid Membrane

2012 ◽  
Vol 485 ◽  
pp. 52-55
Author(s):  
Du Shu Huang ◽  
Zhao Long Huang ◽  
Na Wu ◽  
Jing Wang ◽  
Chun Xu ◽  
...  
Keyword(s):  
Carrier Concentration ◽  
Liquid Membrane ◽  
Extraction Process ◽  
Ion Concentration ◽  
Bulk Liquid ◽  
Separation Performance ◽  
Aliquat 336 ◽  
Bulk Liquid Membrane ◽  
Initial Concentration

L-theanine was extracted by bulk liquid membrane containing Aliquat 336 as a carrier and kerosene as solvent. The effects of theanine initial concentration, carrier concentration and ion concentration in the extracting phase on separation performance were discussed and appropriate extractive conditions were established.

scholarly journals OPTIMALISASI TRANSPOR Zn(II) DENGAN ZAT PEMBAWA DITIZON MELALUI TEKNIK MEMBRAN CAIR FASA RUAH

2015 ◽  
Vol 3 (2) ◽  
pp. 151
Author(s):  
Olly Norita Tetra ◽  
Zaharasmi K ◽  
Zaharasmi K ◽  
Refinel ◽  
Refinel ◽  
...  
Keyword(s):  
Liquid Membrane ◽  
Research Result ◽  
Bulk Liquid ◽  
Operation Technique ◽  
Optimum Conditions ◽  
Membrane Phase ◽  
Bulk Liquid Membrane ◽  
Transport Time ◽  
Source Phase ◽  
Membrane Ion Transport

 ABSTRACT Zn(II) transport from the source phase into the source phase had been researched by using dithizone as carrier through bulk liquid membrane. Ion transport are started by adding 6 mL source phase that consist of Zn(II), 12 mL receiver phase that consist of Na2EDTA and 20 mL membrane phase that consist of dithizone as carrier. The experiment operation technique was assisted by magnetic stirrer mixing at 340 rpm speed within 15 minutes equilibrium time. The measurement was done to both of source phase and receiver phase by using Atomic Absorption Spectrophotometer (213.9 nm) until Zn(II) was transported to receiver phase and residue in source phase was gathered. The research result that optimum conditions to transport 3.06 x 10-4 M Zn(II) was at pH 8.5 of source phase, 1.75 x 10-5 M dithizone concentrate at membrane phase, 0.06 M EDTA concentrate at pH 6 in receiver phase and 3 hours transport time with Zn(II) percentage which was transported to receiver phase 93% and residue in source phase do not detect. Keywords: transport Zn(II), bulk liquid membrane, dithizone

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