Thermal stability based on formaldehyde releasing temperature and POM degradation temperature is important information to evaluate how an in-situ BA-a formation in POM efficiently retards the POM chain degradation by consuming the released formaldehyde and decreases the continuous POM chain scission. The use of TG-FITR was applied so that the degradation temperature and the component generated at that stage can be trace. Figure 3a shows the pristine POM starts showing the formaldehyde peak (CH2O at 1745 cm-1 and 2800 cm-1) at 289 C. As POM-B05A10 was prepared under the condition that POM was molten, the consideration of POM degradation had better reply on the POM after melting, so-called the thermal treated POM, than the
Some Schiff base derivatives were tested as corrosion inhibitors for X52 Carbon steel in 0.5 M HCl using weight loss and electrochemical techniques. The results showed that the inhibition efficiency increases with increasing the concentration of the Schiff base derivatives. Polarization measurements showed that these derivatives act as mixed-type inhibitors. The adsorption of these inhibitors on the surface of Carbon steel follows Temkin’s adsorption isotherm. The effect of temperature on the corrosion was investigated by some thermodynamic parameters were calculated.
INVESTIGATION OF THE WORKING PERFORMANCE OF THE NOVEL PHOSPHOROUS REMOVAL WITH PARTITIONABLE SPACE ENHANCED COAGULATION REACTOR Abstract: Phosphorus pollution is one of the main factors causing water eutrophication. In this study, the phosphorous removal efficiency of commonly used coagulation/flocculation aid, ferrous sulphate has been studied. A series of jar test was conducted to evaluate the pH, dosage and conditions (mixing and flocculation stirring speeds, durations, and settling times) required to achieve optimum waste capture. The dosage of coagulant and pH of solution play important roles in chemical phosphorus removal. The removal efficiency increases with increasing dosage and the optimum Fe/P ratio is 2.5 at which a removal above 90% has been
N-arylsulfonyl tryptophanderivatives were investigated as ligands for the reaction due to “the high π-electron-donating characterof the indole ring” (? )B-n-butyloxazaborolidine was used at 5 mol% to accelerate and control the reaction of cyclopentadiene and 2-bromoacrolein (-78 °C) in DCM. Enantioselectivity of the desired 2R adduct occurred at ca. 200:1 with a high yield. This catalyst can be used to enantioselectively produce gibberellic acid, a plant hormone, as well as the antiulcer agent, cassiol and eunicenone.
The reduction of ethyne occures in an exceedinglyn ammonical solution of chromous chloride or in a solution of chromous salts in H2SO4. The selective catalytic hydrogenation of ethyne to ethylene, that yield over supported Group eight metal catalyst, is of nice industrial importance within the manufacture of ethyne by thermal transformation of organic compound. HALOGENATION AND HYDROHALOGENATION Halogens add to the triple bond.Fecl3 catalyzes the addition of cl2 to ethyne to produce 1,1,2,2-tetrachloromethane that is intermediate within the production of the commercial solvents 1,2-dichloroethylene,trichloroethylene and perchloroethylene. ethyne will be chlorinated to 1,2 –dichloroethylene by directly using FeCl3 as a catalyst and a large excess ethyne trans-C2H2Cl2 is made from ethyne in solutions of CuCl2,CuCl and HCl. Br in solution or as a liquid adds to ethyne to create first 1,2-dibromoethylene and eventually tetrabromoethylene.
4.3. Effect of different stirring speed The Percentage extractions of the Fe3+ ion from the high-level (125ppm) aqueous solution for different stirring speed of MIBK are given in Table 3. Table 3. Percentage extraction of Fe ions at different stirring speed with MIBK. r.p.m Ce % extraction 100 13.53 95.89 200 12.58 96.18 300 4.79 98.54 400 2.95 99.10 500 11.21 96.60 As shown from table increasing the R.P.M from 100 to 400 increases % extraction then decreases; so time 400 R.P.M was chosen as optimum speed of agitation.
The increase of the catalyst molar ratio to 0.05 and 0.10 mmol caused improvement in the rate of 1,2-cyclooctene oxidation with higher conversion compared to the catalytic amount 0.02 mmol of the VO-complexes. Unfortunately, the chemoselectivity was reduced by increasing the amount of the catalyst VO-complexes to be 65,
(M. Chaki et al. /Nitric Oxide 29 (2013) In plants carbonic anhydrase present in the chloroplast stroma and very close to Rubisco. Carbonic anhydrase maintain the supply of CO2 for Rubisco activity. Carbonic anhydrase covert the bicarbonate (HCO3-)
The extracted organic layer was steam bathed to vaporize light petroleum which has low boiling point at 30-40˚C. Chromic acid is a more commonly used reagent for the oxidation of alcohols, it is a suspected carcinogen and generates hazardous waste. In green chemistry, innocuous chemical such as hypochlorous acid, HOCl will be used in oxidation, as to reduce the harmful waste. Green chemistry is the name given to modifications implemented in chemical manufacturing processes that ensure a safer and cleaner
1. Introduction The environmental impacts of ‘greenhouses’ especially CO2 has been well understood to be one of the major contributors to climate change. Contributing to 4.5% CO2 emissions globally from Portland cement production, there is an urge to push towards the minimization of CO2 emissions through developments of a sustainable and environmentally-friendly alternative to Portland cement.i Considering the immense volume of usage globally for Portland cement and its environmental impact, this serves as a necessitation for such developments. Portland cement is used as one of the most fundamental binding material for construction, such alternative material should therefore have the same binding properties possessing the resilience, resistance and durability to adhere construction standards. One of the most notable class of binders is the ‘Alkali-activated material’ (AAM) which offers a promising route as a binder.