The experiment results showed that the optimum synthetic conditions were as follows:Cr 3+ ∶glutamic acid=1∶1.5 (mol/mol),pH6.5～7.0,reaction temperature 80～90℃,reaction time 3h,the yield of product is about 65%.
By single-factor experiments,the optimum synthetic conditions are achieved as follows: n(2-sec-butylphenol)∶n(nitric acid)=1∶3.0,ω(nitric acid)=50%,catalyst amount is 10% of mass of 2-sec-butylphenol,reaction time is 4 h and temperature is 45℃,and the yield of DNBP is 86.8% and its purity is above 98.5%.
The experiment results showed the optimum synthetic conditions as follows: Cr 3+ ∶glutamic acid∶nicotinic acid=1∶1.2∶1.2 (mol∶mol∶mol), pH7.0～7.5, reaction temperature 70～80℃,reaction time 3h. The yield of product was about 60%.
The synthetic conditions are studied by orthogonal experiments. The optimum rection conditions are as follows: the mole ratio of the monomers is n(MA)∶n(AA)=2∶1 and n(MA+AA)∶n(NaH_2PO_2)=15∶1, the mass of initiator is 1.5% of the monomers,the reaction temperature is 70℃,time is 3.5h.
Its optimal synthetic conditions were found as follows: AA 0. 4 mol, AMPS 0. 03 mol, sodium persulfate 0. 03 mol, sodium hypophosphite 0. 02 mol, reaction temperature 70℃, dropping time 1 h, reaction time 2 h.
The effects of synthesis conditions on the yield were investigated and the optimum syn-thesis conditions were determind as follows: n (2,5 - dimethyl - 3 - furanthiol) : n (furoyl chloride) : n (pyridine) = 1:1.5 : 1.5, reaction temperature 5 ℃, reaction time 1.5 h.
The best synthesis conditions are as follows:the monomers mole ratio is n(AMPS)∶n(AA)∶n(MAA)=2∶10∶7, the amount of initiator 1.0%,the reaction temperature and time are 75℃ and 4h respectively. The terpolymer has good properties of inhibiting CaCO_3and Ca_3(PO_4)_2 scale.
The title product is possessed of better stability, tanning and filling retanning properties. By experimental study, the optimum synthesis conditions were obtained as follows:(1)hydroxymethylation reaction stage:n(HCHO)∶n (melamine+dicyandiamide+urea)=3～ 4∶1,reaction temperature 80～80℃, reaction time 0.5～1h,pH 8～9;
The optimum conditions of synthesizing polyacrylamide are carried out by using homogenous design and nonlinear neural network data processing method. The result shows that the optimum theoretic synthesis conditions while the concentration of polyacrylamide is 20% are as follows: the mass ratio of initiator to acryl amide is 0.25%,the mass ratio of chain transfer agent to acryl amide is 1.75%,the ratio of alcohol to water is 0.25 and the reaction time is 4hr.
The optimum synthesis condition of ethyl ferulate which screened out by orthogonal experiment : (1)the ratio of ethanol/ferulic acid is 6:1, (2)the reaction time is 8 hours, (3)the dosage of catalyzer is ferulic acid's 12%.
The four-component graft copolymerization of SBS/MMA-BA and its property were studied in the presence of crosslinking monomer N-MAA. The optimum synthesis condition was obtained in the discussion on the effect of initiator concentration, N-MAA content,mononer concentration,reaction time and temperature on the graft copolymer.
The article exerted intercross experiment method to search the synthesis condition, and then make the best synthesis craft. Under the following condition:MCM-41(T)catalyst, nitric acid, reaction temperature 76℃, reaction time 7h,the yield of nitrobenzene 83.6%.
From the investigation of optimizing reaction condition, We get the optimum synthesis condition of CLT acid. The total yield of CLT acid increased from 62 percent by the batch operation to about 65 percent the once-through operation.
The synthesis process conditions were optimized as followed: mole ratio of ethylene oxide and fatty alcohol 2. 0, mole ratio of fatty alcohol polyoxyethylene and phosphorus pentoxide 3.8, phosphorus pentoxide feeding time 1. 5 h, esterification temperature 70℃ and time 3. 0 h, tri-ethanolamine amount 0. 73 - 0. 76 higher times than fatty alcohol polyoxyethylene phosphonate amount.
The effects of factors such as the synthetic material compositions, ultrasound time and annealed temperature on phosphorescent brightness of sample were studied and the optimum synthetic conditions were determined.
Dependence of the properties of Ce-Zr-Y-La-M-O systems on synthetic conditions and on the nature of the transition metal M (Mn,
The effects of synthetic conditions, component ratios, and the nature of the transition metal on the physicochemical and catalytic properties of Ce-Zr-Y-La-M-O (M = Mn, Fe, Co) systems are studied.
The kinetic model can be used in the determination of optimal synthetic conditions and in the design of a reactor for diphenylamine synthesis from aniline and cyclohexanol.
Synthetic conditions are optimized and physicochemical and sorption characteristics of the resulting polyelectrolytes are examined.
A conclusion is drawn that, under the chosen synthesis conditions of the mesophase materials, the packing density of surfactant molecules in encapsulated micelles increases with the lengthening of the alkyl radical.
Influence of Synthesis Conditions on the Electrokinetic Characteristics of Titanium-Oxygen Nanostructures
Influence of synthesis conditions of titanium-oxygen nanostructures on their electrochemical behavior is studied.
Synthesis conditions that make it possible to obtain (on the boehmite substrate) nanostructures with electrosurface characteristics similar to the properties of corresponding bulk oxides were determined.
Dielectric Parameters of the Model Semielectrics Polyacenequinones and Their Dependence on Synthesis Conditions
The synthesis condition, structure, and morphology of the samples were characterized and analysed by thermogravimetric analysis (TG), differential thermal analysis (DTA), X-ray diffraction (XRD) and transmission electron microscopy (TEM).
The synthesis condition and properties of the latex were investigated.
In this paper, cotton fibres were used as bio-template to successfully synthesize new ceramic materials, ZnO hollow fibres and in an effort to explore the synthesis condition, and simplify the synthesis procedure.
Interestingly, thermal analysis (DTA/TGA) data indicate that the solution synthesis condition seems to affect the crystallization activation energy and onset temperature, which varies from 530 to 680°C.
Under this synthesis condition, TiO2 nanoparticles, which were spherical with diameters approximately ranging from 30 to 60 nm, were synthesized.