2024-03-29T18:35:59Z
https://ijcce.ac.ir/?_action=export&rf=summon&issue=1815
Iranian Journal of Chemistry and Chemical Engineering
Iran. J. Chem. Chem. Eng.
1021-9986
1021-9986
1991
10
1
A Study of Na/K Feldspar Solid Solution Using Statistical Mechanics
Gholam Abbas
Parsafar
Y.
Ghayeb
Thermal behavior of various solid feldspars are different, namely those of bivalent cations show no change in the distribution of Al and Si atoms, whereas feldspars of univalent cations become more disordered with raising temperature. In the latter case Al atoms migrate from the sites they occupe at low temperatures and interchange positions with the Si atoms. At high temperatures (but still below the melting point) the mixture of the two feldspars forms a solid solution, while at low temperatures two almost pure phases separate out from each other. The behavior of pure feldspar (like albite) have been theoretically studied by various methods, while solid solutions of feldspars of univalent cations have not been studied (due to their complexity). In this paper statistical mechanical methods are used to study sodium and potassium feldspar solutions.
Na/K Feldspar
Solid Solution
Statistical Mechanics
1991
06
01
4
15
https://ijcce.ac.ir/article_10935_aa443fa2129ea69ad49269ed4293dd37.pdf
Iranian Journal of Chemistry and Chemical Engineering
Iran. J. Chem. Chem. Eng.
1021-9986
1021-9986
1991
10
1
Fischer-Tropsch Synthesis of Hydrocarbons Using Iron-Mordenite Catalysts
M.M
Akbarnejad
M.
Oskooie
M.
Gharanfoli
Fischer-tropsch catalysts with high activity and selectivity for olefins were produced using mordenite type SiO2/Al2O3= 12, 20, 28, 62 zeolite supported iron carbonyl compounds and were characterized by X-ray powder diffraction. The adsorptionof volatile Fe(CO)5 on the support surface was carried out under vacuum at room temperature. Reduction les were monitored by vibrating sample magnetometer (VSM). The magnetic saturation time was observed to increase with increasing the Al2O3 content of catalyst system indicating an increasing interaction between iron and alumina. The activity and selectivity of different iron deposited mordenite sample were investigated during Fischer-Tropsch synthesis of hydrocarbons with H2/CO=3 in the temperature range of 400-500 °C using a microreactor system. The results correlated with the acidic properties of surface and/or with metallic state of active iron particles of the catalyst.
Fischer-Tropsch synthesis
hydrocarbon
Iron-Mordenite Catalysts
1991
06
01
16
16
https://ijcce.ac.ir/article_10936_744619d9c604bfbda8fff24b91558333.pdf
Iranian Journal of Chemistry and Chemical Engineering
Iran. J. Chem. Chem. Eng.
1021-9986
1021-9986
1991
10
1
In Plane Vibration of Pyrimidine and some Deuterated Pyrimidines
F.
Milani Nejad,
On the basis of 102 assigned frequencies to in plane vibrations of pyrimidine, pyrimidine-2-d2, pyrimidine-2, 5-d2, pyrimidine-4,6-d2, pyrimidine-2,4,6-d3 and pyrimidine-d4, 35 valance force field constants including 14 principals and 21 interaction force constants are calculated. New assignments are suggested for n18b and n19b normal modes in pyrimidine-2,5-d2 and n14 and n18b normal modes in pyrimidine-d4. With this new assignments the agreement between observed and calculated product rule and sum rule has improved.
lane Vibration
Pyrimidine
Deuterated Pyrimidines
1991
06
01
17
23
https://ijcce.ac.ir/article_10938_d511743c89dd393647b66084ba79c359.pdf
Iranian Journal of Chemistry and Chemical Engineering
Iran. J. Chem. Chem. Eng.
1021-9986
1021-9986
1991
10
1
Chemiluminescence Properties of Peroxyoxalate System in Organic Solvents
M.R.
Hadjmohammadi
A.
Samadi Meibodi
Peroxyoxalate system includes an oxalate ester, peroxide and a fluorescer, The energy resulted from the reaction of oxalate ester and peroxide is transferred to fluorescer and cause it to fluorsc. The effect of reactants chemical structure, their concentration, solvent media (polarity and viscosity) and the temperature, on the intensity of the illuminated light with respect to time have been studied. The effect of chemical structure of oxalate ester, fluorescer and peroxide on the intensith of light was found to be follows: DNPO < TCPO < CBPO BPEN < A < DPA < BPEA Tert-Butylhydroperoxide < Hydrogen Peroxid
Chemiluminescence Properties
Peroxyoxalate System
Organic solvents
1991
06
01
24
34
https://ijcce.ac.ir/article_10939_085bad8b56e570d2edb4c84241260acb.pdf
Iranian Journal of Chemistry and Chemical Engineering
Iran. J. Chem. Chem. Eng.
1021-9986
1021-9986
1991
10
1
Second Virial Coefficients for Nonspherical Molecules and Their Experimental Measurements
A.
Boushehri
S.H.
Moosavipour
The virial coefficients can be obtained from statistical mechanics in connection with the intermolecular potentials. The intermolecular potential of polyatomic molecules is usually assumed to consist of a spherically symmetric component plus a contribution due to asphericaity of the molecular charge distribution. In this study, the second virial coefficients have been calculated for N2, CO and SF6 from the Lennard-Jones (6-12) potential. The results are in good agreement with those obtained experimentally.
Non spherical Molecules
Lennard-Jones (6-12) potential
Second Virial Coefficients
1991
06
01
35
39
https://ijcce.ac.ir/article_10940_c76a02f07ae0f205758a9f61bf1524cd.pdf
Iranian Journal of Chemistry and Chemical Engineering
Iran. J. Chem. Chem. Eng.
1021-9986
1021-9986
1991
10
1
NMR Study of Benzo-15-Crown-5 Complexes with 7Li+ and 133Cs+ Ions in Nonaqueous solvents
Mojtaba
Shamsipur
M.K.
Amini
Complexes of benzo-15-crown-5 macrocycle with Li+ and Cs+ ions were investigated by 7Li and 133Cs NMr in a number of nonoqueous solutions. The resulting 1:1 complex with Li+ ion was found to be much more stable than that with Cs+ ion. With the exception of pyridine solutions the stabilities of the complexes varied inversely with the Gutmann donor number of the solvents. Some indirect evidence for the formation of very weak 2:1 complexes was observed.
NMR Study
Benzo-15-Crown-5 Complexes
1991
06
01
40
45
https://ijcce.ac.ir/article_10941_447e6e67088a614756c584a6619d136f.pdf
Iranian Journal of Chemistry and Chemical Engineering
Iran. J. Chem. Chem. Eng.
1021-9986
1021-9986
1991
10
1
Thermal Diffusion Factor in Gas Mixture-Dufour Effect (I)
A.
Boushehri
Ali
Maghari
The thermal diffusion factor, aT, for a binary gas mixture is calculated on the basis of nonequilibrium thermodynamics. A new formula for aT is derived and this factor is given for several paris of gases according to this formula.
Thermal Diffusion Factor
Gas Mixture
Dufour Effect
1991
06
01
46
50
https://ijcce.ac.ir/article_10942_f75854eca899ecd70a65d1966d3787dd.pdf
Iranian Journal of Chemistry and Chemical Engineering
Iran. J. Chem. Chem. Eng.
1021-9986
1021-9986
1991
10
1
Acid Catalysed Condesation of Phloroglucinol and Acetone-Kinetics and Mechanism
H.C.
Malhotra
A.
Aminifar
The kinetic study of the condensation reaction between phloroglucinol and acetone was investigated at 30, 35, 40 and 45±0.05 °C in 100% methanol. The hydrochloric acid concentrations used were 0.0261, 0.0364, 0.0577 and 0.0728 M. The reaction was investigated with and without a promoter, thioglycollic acid (TGA), and taking into account the functionality (h) of phloroglucionol. The reaction was found to obey a second order rate law, the rate increasing with an increase in acid catalyst concentration. The activation parameters for the overall reactions have been calculated. The raction was also carried out in solvents 1,4-di-oxane, isopropanol, ethanol and methanol. The overall rate constants were resolved into step rate constants. A mechanism consistent with the kinetic data has been suggested.
Condesation
hloroglucinol and Acetone-Kinetics
1991
06
01
51
58
https://ijcce.ac.ir/article_10949_1b0583020363f7a80494b6b739e61ca9.pdf
Iranian Journal of Chemistry and Chemical Engineering
Iran. J. Chem. Chem. Eng.
1021-9986
1021-9986
1991
10
1
The Unexpected Effect of Sodium Arsenate on the Interaction between Histone H1 and Sodium N-Dodecyl Sulphate
A.A.
Moosavi Movahedi
M.R.
Housaindokht
A Study was made on the interaction between histon H1 and sodium n-dodecyl sulphate (SDS) in the presence of sodium arsenate inside a phosphate buffer of pH 6.4, using spectroscopy and equilibrium dialysis at 27 °C. The binding data has been used to obtain the gibbs free energy in terms of a theoretical model based on the Wyman binding potential. The binding data hs been analysed in terms of Hill equation, to obtain Hill coefficient. The data show that sodium arsenate exhibits an unusually greater degree of denaturation for the structure of H1.
Histone H1
Sodium arsenate
Sodium n-didecyl sulphate
Free energy
Hill coefficient
1991
06
01
59
65
https://ijcce.ac.ir/article_10950_ce14e9a4bd9294647be0a01af4bb7945.pdf
Iranian Journal of Chemistry and Chemical Engineering
Iran. J. Chem. Chem. Eng.
1021-9986
1021-9986
1991
10
1
Synthesis and Trapping of 3,4,3',4'-Tetradehydrobiphenyl (Bisbenzyne)
J.R.
Williamson
Shadpour
Mallakpour
3,3'-Dicarboxy-4,4'-diaminobiphenyl was synthesized from Onitrobenzoic acid following standard procedures. Diazotization of this compound with isoamylnitrite, under approtic condition gave diphenyl-4,4'-bis-diazonium-3,3'-dicarboxylate and subsequent thermal decomposition of this diazonium compound produced 3,4,3',4'-tetradehydrobiphenyl (bisbenzyne) as a reactive intermediate. Bisbenzyne was trapped with the diene 2,3,4,5-tetraphenylcyclopentadienone via a [4+2]diels-Alder cycloaddition reaction yielding the previously unreported 5,6,7,8,5',6',7',8'-octaphenyl-2,2'-binaphthyl. This novel compound was fully characterized by elemental analysis IR and 1HNMR spectroscopy.
Synthesis
Trapping
3
4
3'
4'-Tetradehydrobiphenyl (Bisbenzyne)
1991
06
01
66
78
https://ijcce.ac.ir/article_10951_aa1a11368d2f7a52b8198f80a47867fa.pdf
Iranian Journal of Chemistry and Chemical Engineering
Iran. J. Chem. Chem. Eng.
1021-9986
1021-9986
1991
10
1
Extraction of Carthamin from Carthamus Tinctorus and Investigating Its Dyeing of Wool Using Potassium DI-Chromate Mordant
N.
Saadatjou
Carthamin, the natural dye of carthamus tinctorius (Golrang) was separated by soxhlet extraction and further purified in good yields. Its mordant dyeing of wool, using potassium dichromate as mordant, showed a high washing fastness (above 4). Mordanting by "sweet chrome", "sour chrome", and "reduced chrome" proved that last one to be superior.
Extraction
Carthamin
rthamus Tinctorus
Dyeing of Wool
1991
06
01
79
86
https://ijcce.ac.ir/article_10952_57a8b5c25687cbac21842f4f56e5e605.pdf