Chemical Review and Letters

Abstract 1,4-dihydropryridine derivatives revealed various biological activities and pharmacological properties such as antiviral, antibacterial and anti-inflammatory activities. In this research, density functional theory (DFT) calculations at the B3LYP level are used to optimize the geometry of the compounds. In this study, we were interested in evaluation of homoaromaticity of the selected compounds using nucleus independent chemical shifts NICS(0), NICS(0.5), NICS(1), NICS(1.5) and NICS(2), bond lengths, bond angles and HOMO-LUMO gap.

Abstract In this project, we have developed a reversed phase liquid chromatography method for separation and determination of lenalidomide (LENA) and related substances by using C-8 (250×4.6 mm ID, 5 μm) HPCL column. The mobile phases A and B were phosphate buffer at Ph=3.30, and (methanol:acetonitrile)(1:5 V/V), respectively. The column oven temperature was 25°C, the wavelength was 220nm, and the injection volume was 20 µl. The degradation studies using basic, acidic, oxidation, and thermal stress, were performed. In addition, in the basic stress, a significant degradation for LENA, was observed.
Also, the results showed that the resolutions of the peaks for fresh, acid stress, and thermal stress were considerably high. For example, in the case of thermal shock, the resolution of each peak to the next, was 3.6, 3.2, 5.3, and 4.7. Thus, it indicates that the method is suitable at least in view of separation and resolution for the peaks produced by thermal shock.

Abstract Coal will still be a significant component of power generation for years to come, and carbon dioxide capture systems will be the essential feature of clean coal in the future. Those who promise to deliver low carbon dioxide capture costs are committed to the pipeline and future systems. So far, many methods of carbon dioxide capture have proved costly and energy-hungry based on coal system additives. Besides, it is continually moving other industries to effectively utilize the amount of carbon present in carbon dioxide and move toward carbon capture and reuse, which is marketed ready for carbon dioxide, but it has different requirements on product quality. This paper aims to review the methods of carbon capture technologies and develop an optimal method for the green coal combustion process using the Energy and Exergy Analysis. According to the results of this paper, the Chemical Looping Combustion is the most suitable method for this process, and with the coal, powerplants using CLC technologies, the Green Coal target can be made real.

Abstract Due to the fact that the concentration of ethylene dichloride in the effluent of Alkali Petrochemical chlorine unit is often less than 500 ppm. Therefore, this method can be used to reduce the amount of ethylene dichloride in wastewater. Using bagasse as a carbon adsorbent to remove EDC from aquatic environments can be more cost-effective than commercial activated carbon, as well as a new approach. This could be because ethylene dichloride does not ionize easily. The adsorbent value. Also Freundlich isotherm model, the mean constant value of proportion = 1.1 mg/g and the adsorption size intensity 1/n = 0.16 and the Langmuir model mean constant values were a = 0.1 and b = 2.6. Since ethylene dichloride is not easily ionized, the changes in soluble pH and also the type of bagasse pre-treated with acid, base and distilled water have little effect on the adsorption rate.

Abstract Comparison of various technologies for uranium recovery from sulphuric acid leach solutions shows that the moving bed systems are more effective processing routes than fixed bed. Developed system using air pulsation for resin moving was tested and examined for uranium recovery from Gattar pilot plant project (North Eastern Desert, Egypt) sulphuric acid leach liqour using Chinese resin D263B. Recovery equilibrium and kinetic isotherms are established. The obtained results showed high performance and the validity of derived pulsed resin column for uranium extraction. Elution behavior was improved by using intense fractional eluent which gives efficient results.

Abstract Super critical extraction is a new method for separation of efficient processes and effective method for extracting a necessary foundation of solid or liquid material are suitable purity. Seed sunflower seed oil is the second one year after soy which is cultivated for its oil on the world. In this article, sunflower seed oil is extracted by liquid carbon dioxide in super critical conditions. Effects of temperature, pressure and grain size in the rate of extraction efficiency were the change in particle size among other parameters extraction efficiency because they have a role and the smaller the size, the efficiency is higher. Results proves is that temperature changes and pressure changes in comparison with particle size in the process of extraction efficiency was less effect because of reduced grain size increased 75 percent extraction efficiency. While the temperature increase of 16 percent and increasing pressure about 5 percent increase in extraction efficiency was observed.