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Mathematical Planning for Revealing Optimal Synthetic Conditions of Naphthalene Chloromethylation
Pak, V.V.,Karimov, R.K.,Shakhidoyatov, Kh.M.,Yun, L.M.,Soh, D.W. The Speleological Society 2006 동굴 Vol.71 No.-
Chloromethylnaphthalene is a valuable compound for obtaining of the plant growing stimulator - -napthylacetic acid. Chloromethylation of naphthalene by paraformaldehyde in the presence of glacial acetic acid, phosphoric and hydrochloric acids at temperature 80 - 85C and duration - 6 hours the -chloromethylnaphthalene yield was 55-57%. Using Box-Wilson method for mathematical planning of experiment carried out optimization of its synthesis for purpose increasing -chloromethylnaphthalene yield. Preliminary, one - factor experiments were carried out for selecting independence main parameters influencing on the synthesis. A full factor experiment of 23 with extended matrix of planning was used for optimization. Aiming to increase the -chloromethylnaphthalene yield, the obtained mathematical model was used for program of sharp raising on the reply surface. The received optimal conditions for the -chloromethylnaphthalene synthesis were selected as following: molar ratio of naphthalene parapfsormaldehyde of 1 : 2 temperature - 105C duration of the reaction - 3 hours. The yield of -chloromethylnaphthalene under these optimal conditions was 75%.
Process Optimization of Biphenile Chloromethylation
Pak, V.V.,Karimov, R.K.,Shakhidoyatov, Kh.M.,Soh, D.W. The Speleological Society 2006 동굴 Vol.73 No.-
Optimization of the biphenile chloromethylation process with paraphormaldegide has been done in the presence of $ZnCl_2$ with HCl gas by the Box-Wilson method of mathematical planning of experiment. The 4,4'-(dichloromethyl)-biphenile yield dependence on the piphenile -paraphormaldegide ratio, temperature and reaction duration has been studied. A mathematical model of the process has been developed and optimal conditions for the biphenile chloromethylation procedure has been determined.
Syed Abdul Moiz,Mansoor M. Ahmed,Kh. S. Karimov 한국전자통신연구원 2005 ETRI Journal Vol.27 No.3
In this paper the effect of temperature on the electrical properties of organic semiconductor disperse orange dye 25 (OD) have been examined. Thin films of OD have been deposited on In2O3 substrates using a centrifugal machine. DC current-voltage (I-V) characteristics of the fabricated devices (Al/OD/In2O3) have been evaluated at varying temperatures ranging from 40 to 60°C. A rectification behavior in these devices has been observed such that the rectifying ratio increases as a function of temperature. I-V characteristics observed in Al/OD/In2O3 devices have been classified as low temperature (≤ 50°C) and high temperature characteristics (approximately 60°C). Low temperature characteristics have been explained on the basis of the charge transport mechanism associated with free carriers available in OD, whereas high temperature characteristics have been explained on the basis of the trapped space-charge-limited current. Different electrical parameters such as traps factor, free carrier density, trapped carrier density, trap density of states, and effective mobility have been determined from the observed temperature dependent I-V characteristics. It has been shown that the traps factor, effective mobility, and free carrier density increase with increasing values of temperature, whilst no significant change has been observed in the trap density of states.
Process Optimization of Biphenile Chloromethylation
( V. V. Pak ),( R. K. Karimov ),( Kh. M. Shakhidoyatov ),( D. W. Soh ) 한국동굴학회 2006 동굴 Vol.73 No.-
Optimization of the biphenile chloromethylation process with paraphormaldegide has been done in the presence of ZnCl2 with HCI gas by the Box-Wilson method of mathematical planning of experiment. The 4,4`-(dichloromethyl)-biphenile yield dependence on the biphenile-paraphormaldegide ratio, temperature and reaction duration has been studied. A mathematical model of the process has been developed and optimal conditions for the biphenile chloromethylation procedure has been determined.
Mathematical Planning for Revealing Optimal Synthetic Conditions of Naphthalene Choromethylation
( V. V. Pak ),( R. K. Karimov ),( Kh. M. Shakhidoyatov ),( L. M. Yun ),( D. W. Soh ) 한국동굴학회 2006 동굴 Vol.71 No.-
Chloromethylnaphthalene is a valuable compound for obtaining of the plant growing stimulato-napthylacetic acid. Chloromethylation of naphthalene by paraformaldehyde in the presence of glacial acetic acid, phosphoric and hydrochloric acids at temperature 80-85C and duration -6 hours the-chloromenthylnapnaphtalene yield was 55-57%. Using Box- Wilson method for mathematical planning of experiment carried out optimization of its synthesis for purpose increasing- chloromethylnaphthalene yield. Preliminary, one - factor experiments were carried out for selecting for selecting independence main parameters influencing on the synthesis. A full factor experiment of 23 with extended matrix of planning was used for optimization. Aiming to increase the-chloromethylnaphthalene yield, the obtained mathematical model was used for program of sharp raising on the reply surface. The received optimal conditions for the- chloromethylnaphthalene synthesis were selected as following: molar ratio of naphthalene-parapfsormaldehyde of 1 : 2 temperature-105C duration of the reaction - 3 hours. The yield of - chloromethylnaphthalene under these optimal conditions was 75%.