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In this book a unique protocol for selecting, evaluating, characterizing, and modifying potential Solvent Resistant Polymeric Nanofiltration (SRNF) membranes for organic solvent separation as well as elucidating some of the underlying principles are presented. Organic solvent separation systems are encountered in industries including the petroleum, petrochemicals, pharmaceutical, biotechnology and fine chemicals where polymeric membranes and if not selected or modified properly may result in very low performances as results of possible excessive swelling and compaction. Ultrasonic Time Domain Reflectometry (UTDR) is involved for in-situ and real-time chemical (swelling) and mechanical (compaction) analysis as well as characterization while the membrane is permeated with an organic solvent or feed of interest. Performance parameters used to assess the membrane include flux, rejection, separation factor, solute and solvent relative recoveries and relative solute loss. These performance parameters provide an approach to access and monitor the effects of operating conditions on both solute purification and solvent recovery for re-use.
A green chemical synthetic protocol has been developed for the rapid parallel synthesis of a library of biologically potential 2-amino-4-arylthiazoles, employing water as a solvent under microwave irradiation (MWI). This novel process yields the target NCE’s in very short time, good yield and purity. The judicious use of water as green solvent is attractive and cost effective & makes the process eco-friendly. Besides the general discussion on the biology and synthesis of 2-aminothiazoles, a short review on MWI and use of water as a green solvent is also included. The target NCE’s bear good antifungal and antibacterial potential.
Development of Epoxy Clay Nanocomposites with fine dispersion and exfoliated morphologies is a challenge, since high shear is always required but epoxy has low viscosity (in general). Direct stirring of organoclay and epoxy with mechanical stirring and sonication is widely used to disperse nanoclay in epoxy. However it is not enough for good dispersion of clay in epoxy. The solvent assistance method can help to improve the dispersion of clay in epoxy. However, a lot of solvent was used and significant time was required for removing the solvent. This research monograph deals with nanocomposite materials of organic epoxy layered silicate. A solvent-free stirring method is used to fabricate the epoxy nanocomposites. The effect of chemistry of clay intercalants, chemistry of hardener and epoxy formulations on processing, curing kinetics, morphology and properties of epoxy nanocomposites is discussed.
The study of dyes, particularly, the color-structure relationships drew from structural and physical organic chemistry, including resonance theory, MO methods and electronic spectra get tremendous momentum. Later on, many research activities have been put forward in the literature concerning the effect of solvent polarity on the formation of adduct of different dyes. These investigations provide distinct information to account the effect of solvent polarity. In this event, the solvent dependent properties are subjected to rigorous mathematical analysis, which rationalize solvent effects in terms of the properties of the medium.
Solvent extraction technology is a technology that is used comercially for gold recovery and purification from copper electrorefining anode slimes. The recovery of gold and the deportment of selected impurities were investigated during the solvent extraction of commercial aqueous leachate with dibutyl carbitol (DBC). The results obtained were analyzed in terms of gold extraction and deportment of selected impurities, such as copper, silver, bismuth and selenium. This project demonstrated gives a study of batch, continuous as well as mini pilot plant to understand the capability of a continuous solvent extraction system to produce a lower gold bearing raffinate in both loading and washing. The deportment of impurities during all the experiments was also compared.
a)Introduction to the problem:This study reveals the concept of mixed solvency, which explains that all substances whether liquids, gases or solids possess solubilizing power. Till now this concept have been utilized extensively in the field of pharmaceutical analysis and formulation with an aim to preclude the use of organic solvent, avoids the problem of residual solvent toxicity, reduce the individual concentration of solubilizers and thereby reduce their associated toxicity, replace relatively toxic class-II solvent by safer class-III solvent, potentiation of weaker solvent by use of proper choice of solubilizers and at last economic as well as eco-friendly. This concept can also be applied in formulation development of NDDS like microspheres, SEDDS etc and herbal extraction. In future, this concept shall prove a boon in pharmaceutical field and also in non-pharmaceutical field. b)Abstract:The objective is to explore mixed solvency concept in preparation of floating microspheres of furosemide. The prepared microspheres showed better result and prolongs the drug release (12h). c)Target groups: Pharmaceutics & pharmaceutical analysis.
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The Vapor Extraction (VAPEX) has been studied theoretically and experimentally. In the first part of this work, the VAPEX process was simulated using a compositional simulator on conventional and fractured systems. Different patterns of solvent flow in fractured model comparing to the conventional model, solvent spread through fractures matrix, formation of solvent chamber, and oil recovery factor under different solvent injection schemes, effects of diffusion and fracture spacing on the process were studied and discussed. A significant finding for the application of the VAPEX process in fractured reservoirs was that fractures of poor connectivity improve the effectiveness of VAPEX process. In the second part of this work, the VAPEX process was studied experimentally using a rectangular physical model. Propane ( pure and mixed with methane) was used as solvent in all experiments. It was found that heavy oil recovery is improved as the approach pressure, defined as the saturation pressure minus operating pressure, decreases regardless of solvent composition or operating pressure. These results provide a better insight into field scale implementation of the VAPEX process.
A 40% of the new drug candidates under FDA review. Considerable efforts have been directed at increasing the solubility of these hydrophobic compounds by creating nanoparticles formulations with high surface- to-volume ratios. Conventional techniques to form Nanoparticles include slow anti-solvent addition followed by dialysis, solvent evaporation and emulsification followed by solvent stripping. Rapid precipitation from an organic solvent into an aqueous anti-solvent has proven an attractive processing scheme for laboratory studies as well as for large scale operations. Nanoparticles are solid colloidal particles composed of natural, synthetic, or semi synthetic polymers. The size ranges from 1 nm to 1000 nm. The drugs or other molecules may be dissolved into the nanoparticles, entrapped, encapsulated, and/or adsorbed or attached.A variety of drugs such as hydrophilic drugs, hydrophobic drugs, proteins, vaccines, and biological macromolecules using nanoparticles as carriers. Nanoparticles have a further advantage over larger microparticles, because they are better suited for intravenous delivery.Nanoparticles have been highly exploited for controlled drug release.
This book reveals the concept of mixed solvency, which explains that all substances whether liquids, gases or solids possess solubilizing power .Till now this concept have been utilized extensively in the field of pharmaceutical analysis and formulation. Furosemide is a widely used loop diuretic indicated for the treatment of different pathological conditions such as congestive heart failure, hepatic cirrhosis, and chronic renal failure. The objective of present work is to develop gastroretentive controlled release microspheres of furosemide using emulsification solvent evaporation method by using mixed solvency concept with the aim to make ethyl acetate a strong solvent for emulsification solvent evaporation process and to preclude the use of toxic organic solvents since ethyl acetate is safer (class 3 organic solvent) than those generally employed for microsphere production i.e. methylene chloride (class 2 organic solvent). This book provides detailed knowledge of mixed solvency concept, microspheres preparation technique and optimization methodology.
Liquid-liquid equilibrium data of toluene or benzene+n-hexane or n-heptane or n-octane hydrocarbon systems are reported with many solvent mixtures at 298.15K.Complete phase digrams were obtained by evaluating the solubility and tie line results for each ternary mixture. The thermodynamic models :NRTL,UNIQUAC,and UIFAC models were used to correlate the experimental data and to predict the phase compositions of the ternary systems.The NRTL equation fitted the experimental data better than the UNIQUAC and UNIFAC equations:the average root mean square deviations (RMSD) was 0.165 for NRTL as compared to 0.491 for UNIQUAC and 1.304 for UNIFAC.