Mechanism and equilibrium modeling of Re and Mo adsorption on a gel type strong base anion resin

2017 ◽  
Vol 90 (9) ◽  
pp. 1504-1513 ◽  
Author(s):  
Mohammad Bagher Fathi ◽  
Bahram Rezai ◽  
Eskandar Keshavarz Alamdari ◽  
Richard Diaz Alorro
Keyword(s):  
Strong Base ◽  
Equilibrium Modeling ◽  
Anion Resin

EFFECT OF COMPOSITION OF COAL2O4 CERAMIC PIGMENT SYNTHESIZED BY ANION RESIN EXCHANGE PRECIPITATION METHOD ON ITS OPTICAL PROPERTIES

2020 ◽  
Vol 21 (9) ◽  
pp. 403-408
Author(s):  
Svetlana Saikova ◽  
◽  
Elena Pikurova ◽  
Marina Panteleeva ◽  
Irina Korolkova ◽  
...  
Keyword(s):  
Optical Properties ◽  
Anion Exchange ◽  
Exchange Resin ◽  
Anion Exchange Resin ◽  
Ceramic Pigment ◽  
Precipitation Method ◽  
Ceramic Pigments ◽  
Strong Base ◽  
Anion Resin

Ceramic pigments based on spinel CoAl2O4 have been synthesized with use the anion resin exchange precipitation method, where the strong base anion exchange resin AV-17-8 in the OH-form are used as a precipitate agent. The effect of the amount of cobalt in the pigment on its structure, color and optical properties ise shown.

Process study on adsorption of glycerin from saline wastewater by strong base anion resin

2010 ◽  
Vol 5 (1) ◽  
pp. 113-116 ◽  
Author(s):  
Haitao Zhang ◽  
Xiaoqing Ma ◽  
Xian Qu ◽  
Jeanpierre Arcangeli
Keyword(s):  
Saline Wastewater ◽  
Strong Base ◽  
Anion Resin ◽  
Process Study

Influence of Feedwater TOC on Steam Cation Conductivity

2017 ◽  
Author(s):  
Xu Hong
Keyword(s):  
Ion Exchange ◽  
Feed Water ◽  
General Corrosion ◽  
Exchange System ◽  
Makeup Water ◽  
Water Steam ◽  
Strong Base ◽  
Anion Resin ◽  
External Heating ◽  
Cation Conductivity

The cation conductivity in water-steam cycle has been significantly increased as external heating units presented on trends in large capacity and high parameters. Real test has been carried out to demonstrate the TOC concentration in feedwater has been increased as the external heating increases. The presence of organic acid would significantly reduce the pH of the condensate and result in general corrosion, pitting and environment assisted cracking. For the cogeneration thermal power stations in which make-up water were produced with traditional ion exchange system and Integrated Membrane Technology separately, the main factors affecting cation conductivity of steam are residues of the organics in raw water and dynamic variation about bacterial reproduction in reducing environment, respectively. If gel type anion resin had been replaced with macroporous strong base anion resin, the remaining TOC in traditional ion exchange system could be significantly reduced. And if non-oxidative bactericide had been dosed before or after Ultrahigh Purity Filter, bacteria could be effectively killed. For heat-supply units, the actual rates of makeup water, denote with “N%”, are always more than the design value. So it is very important in this scenario to revise the ceiling values of TOC for makeup water, which should be divided by N, to allow that ceiling value to match the actual rate of makeup water. For drum boilers and once-through boilers which superheated steam pressure are greater than 18.3 MPa, in order to guarantee the cation conductivity (25 °C) values of feed water less than the standard of 0.10 μ S/cm, TOC values in feed water should be under 50μ g/L.

PEMODELAN MATEMATIS ADSORPSI CO2 DENGAN STRONG BASE ANION EXCHANGE RESIN SEBAGAI ADSORBEN UNTUK PURIFIKASI BIOGAS

2015 ◽  
Vol 5 (1) ◽  
pp. 11
Author(s):  
Anies Mutiari ◽  
Wiratni Wiratni ◽  
Aswati Mindaryani
Keyword(s):  
Anion Exchange ◽  
Pilot Plant ◽  
Exchange Resin ◽  
Anion Exchange Resin ◽  
Scale Up ◽  
Sum Of Squares ◽  
Strong Base ◽  
Model Transfer ◽  
Plant Parameter

Pemurnian biogas telah banyak dilakukan untuk menghilangkan kadar CO2  dan meningkatkan kandungan CH4  yang terkandung di dalamnya. Kandungan CH4 yang tinggi akan memberikan unjuk kerja yang lebih baik. Model  matematis proses adsorpsi CO2 disusun berdasarkan teori lapisan film antar fasa, dimana pada proses yang ditinjau terdapat tiga fase yaitu gas, cair dan padat. Model matematis dari data eksperimental   kecepatan dan kesetimbangan proses adsorpsi CO2 melalui mekanisme pertukaran ion di suatu kolom adsorpsi telah dibuat. Model ini dibuat untuk mencari konstanta yang dapat dipergunakan pada proses scale up data laboratorium ke skala pilot plant. Parameter proses kecepatan yang dicari nilainya adalah koefisien transfer massa massa volumetris CO2 pada fase cair (kLa), koefisien transfer massa volumetris CO2 pada fasegas (kGa) dan tetapan laju reaksi (k1 dan k2). Pada hasil penelitian ini ditunjukkan bahwa nilai parameter yang diperoleh sesuai hasil fitting data dengan model matematis yang digunakan, yaitu model transfer massa pada lapisan film antar fase secara seri: adalah kGa, kla, k1 dan k2  dengan nilai Sum of Squares Error (SSE) rata-rata 0,0431. Perbandingan nilai kGa hasil simulasi dan teoritisnya memberikan kesalahan rata-rata 18,79%. Perbandingan nilai kLa hasil simulasi dan teoritis memberikan kesalahan rata-rata 7,92%.Kata kunci: model matematis, adsorpsi CO2, pemurnian biogas

A Facile One-pot Synthesis of Substituted Quinolines via Cascade Friedlander Reaction from Isoxazoles with Ammonium Formate-Pd/C and Ketones

2020 ◽  
Vol 17 (3) ◽  
pp. 211-215
Author(s):  
Da Chen ◽  
Xuan Wang ◽  
Runnan Wang ◽  
Yao Zhan ◽  
Xiaohan Peng ◽  
...  
Keyword(s):  
Hydrogen Transfer ◽  
Ammonium Formate ◽  
Aromatic Ketone ◽  
Reaction Conditions ◽  
One Pot ◽  
Diverse Range ◽  
Strong Base ◽  
Aromatic Ketones ◽  
Substituted Quinolines ◽  
New Strategy

The Friedlander reaction is the most commonly used method to synthesis substituted quinolines, the essential intermediates in the medicine industry. A facile one-pot approach for synthesizing substituted quinolines by the reaction of isoxazoles, ammonium formate-Pd/C, concentrated sulfuric acid, methanol and ketones using Friedlander reaction conditions is reported. Procedures for the synthesis of quinoline derivatives were optimized, and the yield was up to 90.4%. The yield of aromatic ketones bearing electron-withdrawing groups was better than the ones with electron-donating substituents. The structures of eight substituted quinolines were characterized by MS, IR, H-NMR and 13CNMR, which were in agreement with the expected structures. The mechanism for the conversion was proposed, which involved the Pd/C catalytic hydrogen transfer reduction of unsaturated five-membered ring of isoxazole to produce ortho-amino aromatic ketones. Then the nucleophilic addition of with carbonyl of the ketones generated Schiff base in situ, which underwent an intermolecular aldol reaction followed by the elimination of H2O to give production of substituted quinolines. This new strategy can be readily applied for the construction of quinolines utilizing a diverse range of ketones and avoids the post-reaction separation of the o-amino aromatic ketone compounds. The conventionally used o-amino aromatic ketone compounds in Friedlander reaction to prepare substituted quinoline are laborious to synthesize and are apt to self-polymerize. While oxazole adopted in this work can be prepared at ease by the condensation of benzoacetonitrile and nitrobenzene derivatives under the catalysis of a strong base. Moreover, the key features of this protocol are readily available starting materials, excellent functional group tolerance, mild reaction conditions, operational simplicity, and feasibility for scaling up.

Phase equilibrium modeling of gas hydrate systems for CO2 capture

2012 ◽  
Vol 48 ◽  
pp. 13-27 ◽  
Author(s):  
Peter Jørgensen Herslund ◽  
Kaj Thomsen ◽  
Jens Abildskov ◽  
Nicolas von Solms
Keyword(s):  
Phase Equilibrium ◽  
Co2 Capture ◽  
Gas Hydrate ◽  
Equilibrium Modeling

scholarly journals Sorption of chromium (VI) from electroplating rinse water by strong base anion exchanger: equilibrium and kinetic studies

2021 ◽  
Vol 1913 (1) ◽  
pp. 012076
Author(s):  
Prasanna S Koujalagi ◽  
Harish N Revankar ◽  
Raviraj M Kulkarni ◽  
Vijayendra R Gurjar
Keyword(s):  
Anion Exchanger ◽  
Kinetic Studies ◽  
Strong Base ◽  
Chromium Vi ◽  
Rinse Water

scholarly journals Routine clinical care data from thirteen cardiac outpatient clinics: design of the Cardiology Centers of the Netherlands (CCN) database

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Sophie H. Bots ◽  
Klaske R. Siegersma ◽  
N. Charlotte Onland-Moret ◽  
Folkert W. Asselbergs ◽  
G. Aernout Somsen ◽  
...  
Keyword(s):  
Risk Factors ◽  
General Practitioner ◽  
Data Collection ◽  
The Netherlands ◽  
Strong Base ◽  
Daily Care ◽  
Cardiac Symptoms ◽  
Number Of Patients ◽  
Patient Groups

Abstract Background Despite the increasing availability of clinical data due to the digitalisation of healthcare systems, data often remain inaccessible due to the diversity of data collection systems. In the Netherlands, Cardiology Centers of the Netherlands (CCN) introduced “one-stop shop” diagnostic clinics for patients suspected of cardiac disease by their general practitioner. All CCN clinics use the same data collection system and standardised protocol, creating a large regular care database. This database can be used to describe referral practices, evaluate risk factors for cardiovascular disease (CVD) in important patient subgroups, and develop prediction models for use in daily care. Construction and content The current database contains data on all patients who underwent a cardiac workup in one of the 13 CCN clinics between 2007 and February 2018 (n = 109,151, 51.9% women). Data were pseudonymised and contain information on anthropometrics, cardiac symptoms, risk factors, comorbidities, cardiovascular and family history, standard blood laboratory measurements, transthoracic echocardiography, electrocardiography in rest and during exercise, and medication use. Clinical follow-up is based on medical need and consisted of either a repeat visit at CCN (43.8%) or referral for an external procedure in a hospital (16.5%). Passive follow-up via linkage to national mortality registers is available for 95% of the database. Utility and discussion The CCN database provides a strong base for research into historically underrepresented patient groups due to the large number of patients and the lack of in- and exclusion criteria. It also enables the development of artificial intelligence-based decision support tools. Its contemporary nature allows for comparison of daily care with the current guidelines and protocols. Missing data is an inherent limitation, as the cardiologist could deviate from standardised protocols when clinically indicated. Conclusion The CCN database offers the opportunity to conduct research in a unique population referred from the general practitioner to the cardiologist for diagnostic workup. This, in combination with its large size, the representation of historically underrepresented patient groups and contemporary nature makes it a valuable tool for expanding our knowledge of cardiovascular diseases. Trial registration: Not applicable.

Sign in / Sign up

Export Citation Format

Share Document