The oxidation operated at 175-225°C and 15-30 bar of oxygen. The terephthalic acid formed mostly in the form of solid due to the low solubility of terephthalic acid in the acetic acid. AMOCO process successfully gives a promising reaction yield, since more than 98% of para-xylene reacted, while terephthalic acid selectivity yield was about 95% in the reaction time of 8-24 hours (Scheme 3). Scheme 3. AMOCO commercial process of para-xylene oxidation to terephthalic acid .
1985). c) Complexation with Nitrogen and Oxygen ligands (Mueller et al. 1989). It has been observed that gram positive bacteria have relatively high contents of peptidoglycan and teichoic acid in their cell wall: whereas, gram negative bacteria have lower content of these molecules. This is why gram positive bacteria have high metal adsorptive capacity and gram negative bacteria have poor metal adsorptive capacity (Gavrilescu 2004).
The increase in industrial, agricultural practices and several anthropogenic activities adds a significant amount of heavy metals in soil and water. Presence of these metals beyond threshold limit is toxic for the flora and fauna of the surroundings. So, there is a need for removing the harmful heavy metals from the environment. Several methods such as precipitation, evaporation, electroplating, ion exchange, membrane processes etc. have been developed for the decontamination of heavy metals from environment.
For antibacterial screening one gram(+) bacterium (Staphylococcus aureus -MTCC 960) and one gram(-) bacterium (Escherichia coli- MTCC 739) were used whereas for antifungal tests, two plant pathogenic fungi namely Fusarium graminarum (MTCC-1893) and Fusarium oxysporum f. sp. ciceri (MTCC-2791) were used. The ethanolic extract of A. chinensis showed highest antibacterial (14 mm and 12 mm respectively) activity against both tested bacteria. High superoxide dismutase (9.235±0.586), catalase (93.212±1.046) and Ascorbic acid oxidase (1.663±0.242) activity was also recorded in A. chinensis. In this study we concluded that A. chinensis is having high anti... ... middle of paper ... ...ng ability due to their hydroxyl group and directly contribute to the antioxidant action.
• C10100 Knowns as free of oxygen- (OFE). This pure copper by p.% Y contains the percentage of oxygen 0.0005 atopic Sudaihakq a lower level which is 101% g Ranked conductive determined by GS delivers to its final form in oxygen-free environment and carefully regulated. Ag enters impurity in the chemical specifications and rated the most expensive grades of which will be mentioned later. • C10200 - also known as Oxygen-Free (OF). While OF is considered oxygen-free, its conductivity rating is no better than the more common ETP grade below.
Therefore, production of biodiesel from waste oils is not only a solution for the environmental problems of disposing it, but also improved the economics of the... ... middle of paper ... ...8 wt.%. It can be concluded that biodiesel yield strongly influences from all studied operating parameters. The predicted mathematical model was confirmed by both statistical and empirical assessments. Optimum condition for WCO transesterification was found as temperature of 65 °C, catalyst loading of 1.4 wt.% and MeOH/oil molar ratio of 7.5:1. From the ANOVA results, alkali catalyst concentration was the most important parameter that affects the biodiesel productivity.
A recent study by Juwarkar et al., (2007), demonstrated the metal mobilization potential of P. aeruginosa BS2 under in vitro column experiments and reported the production of a biosurfactant, dirhamnolipid that aid in the solubilization of Cd and Pb compounds from artificially metal contaminated soil. Although the several studies of scientist reveals that significant role of microbial biosurfactant in facilitating the release of adsorbed heavy metal and in enhancing the phytoextraction potential of plants, these observations were mostly obtained from the plants grown in artificially metal contaminated soils and evidence supporting the biosurfactant
Advantages of using MDEA over MEA or DEA: 1. The fact that MDEA is a tertiary amine makes it less basic. Also there is no hydrogen attached to nitrogen. So if any CO2 is present in gas, it can react only after CO2 dissolves in order to form bicarbonate, which then undergoes acid-base reaction with amines. But both MEA and DEA react with all the CO2 present in the gas stream.
Measure out 0.1 g. of the H2TTP made previously into a 100 mL ... ... middle of paper ... ...aporates off the gel leaving open sites where polar molecules can bond. When you let silica gel out in the open, it will collect water molecules on it. Compounds would elute faster down a column that has been heated at 150 degrees for 8 hours because the gel would be dry. 3. A mixture of cis and trans isomers of the neutral complex Cr(CO)4[P(C6H5]2 is loaded onto a silica gel and eluted with CHCl3.
The aqueous layer was on the bottom because it was denser than the organic layer. The aqueous layer contained the benzoic acid and the organic layer contained the naphthalene. The drying step was partially successful in the experiment because it rid the organic layer of excess water. In the end, the melting point range of the naphthalene was 55-62 °C, unlike the actual determined melting point of 80.2 °C. There is a possibility that less than needed sodium sulfate had been added to the organic layer mixture because the melting point could have been negatively affected by excess water not absorbed by the sodium sulfate.