Solvent effects on 2,4-dinitrotoluene（2,4-DNT） molecule in different solvents（toluene, ethanol, and water） were studied via DFT PCM method at B3LYP/6-311＋G（d,p） level. The influences of these solvents on the mo...Solvent effects on 2,4-dinitrotoluene（2,4-DNT） molecule in different solvents（toluene, ethanol, and water） were studied via DFT PCM method at B3LYP/6-311＋G（d,p） level. The influences of these solvents on the molecular structure, vibrational spectra, charge distribution, and dipole moment were studied as well. The results show that PCM computations are successful in describing the vibrational spectra of 2,4-DNT molecules in these solutions and the solvent effects on the low frequency vibrational spectra are weak.展开更多
2,4-Dichlorophenol was removed from wasterwater using a new hydrophobic poly（phthalazinone ether sulfone ketone） （PPESK） hollow fiber membrane by vacuum membrane distillation （VMD）.
The title compounds, C12HIoN307SCI （I） and C15H27NO3S （II）, crystallize in the monoclinic system, space group P21/c with a = 7.3995（1）, b = 27.8489（6）, c = 9.8246（2）/, fl = 131.349（1）, V = 1519.82（5） A3,...The title compounds, C12HIoN307SCI （I） and C15H27NO3S （II）, crystallize in the monoclinic system, space group P21/c with a = 7.3995（1）, b = 27.8489（6）, c = 9.8246（2）/, fl = 131.349（1）, V = 1519.82（5） A3, Z = 4, F（000） = 768, Rint = 0.033 and S = 1.03 for I, and in the orthorhombic system, space group Pbca with a = 8.6227（1）, b = 16.1480（4）, c = 23.8774（6）/, V= 3324.67（12） A3, Z = 8, F（000） = 1312, Rint = 0.024 and S = 1.04 for II. We have devised a convenient procedure for the synthesis of fused organic salts resulting from 1：1 proton-transfer, using an amine and a derivative ofbenzenesulfonic acid. The synthesized salts have a number of applications ranging from their consumption as eco-friendly solvents and catalysts in organic syntheses, to being used as efficient precursors for the production of sulfa drugs. Structures of compounds 3-chloroanilinium 2,4-dinitrobenzenesulfonate （CA-DNBS） and triethylaminium 2,4,6-trimethylbenzenesulfonate （TEA-TMBS） were determined by single-crystal X-ray diffraction studies and infrared spectroscopy.展开更多
β-naphthalene sulfonic acid sodium-formaldehyde condensate is an important additive as dispersant,water reducing agent,surfactant and antioxidant in electrolytic metal manganese process.The free formaldehyde in the c...β-naphthalene sulfonic acid sodium-formaldehyde condensate is an important additive as dispersant,water reducing agent,surfactant and antioxidant in electrolytic metal manganese process.The free formaldehyde in the condensate inevitably affects its performance.The content of free formaldehyde can be determined with HPLC method by previously reacting with 2,4-dinitrophenylhydrazine to derive 2,4-dinitrophenylhydrazone.This paper optimized the reaction condition for formaldehyde derivative formation,2,4-dinitrophenylhydrazone is totally transformed form formaldehyde in 20 min,at 30℃,in hydrochloric acid.For the external standard method,the correlation coefficient(r) and RSD were 0.9999,4.07%,respectively,and the detection limit was 0.1mg/L.To spike the samples with formaldehyde at concentration of 1.25,2.50,and 7.50 mg/L,the recoveries were 98.4%,94.0% and 97.0%,respectively.展开更多
基金Supported by the National Natural Science Foundation of China(No.10534010)
文摘Solvent effects on 2,4-dinitrotoluene（2,4-DNT） molecule in different solvents（toluene, ethanol, and water） were studied via DFT PCM method at B3LYP/6-311＋G（d,p） level. The influences of these solvents on the molecular structure, vibrational spectra, charge distribution, and dipole moment were studied as well. The results show that PCM computations are successful in describing the vibrational spectra of 2,4-DNT molecules in these solutions and the solvent effects on the low frequency vibrational spectra are weak.
文摘2,4-Dichlorophenol was removed from wasterwater using a new hydrophobic poly（phthalazinone ether sulfone ketone） （PPESK） hollow fiber membrane by vacuum membrane distillation （VMD）.
文摘The title compounds, C12HIoN307SCI （I） and C15H27NO3S （II）, crystallize in the monoclinic system, space group P21/c with a = 7.3995（1）, b = 27.8489（6）, c = 9.8246（2）/, fl = 131.349（1）, V = 1519.82（5） A3, Z = 4, F（000） = 768, Rint = 0.033 and S = 1.03 for I, and in the orthorhombic system, space group Pbca with a = 8.6227（1）, b = 16.1480（4）, c = 23.8774（6）/, V= 3324.67（12） A3, Z = 8, F（000） = 1312, Rint = 0.024 and S = 1.04 for II. We have devised a convenient procedure for the synthesis of fused organic salts resulting from 1：1 proton-transfer, using an amine and a derivative ofbenzenesulfonic acid. The synthesized salts have a number of applications ranging from their consumption as eco-friendly solvents and catalysts in organic syntheses, to being used as efficient precursors for the production of sulfa drugs. Structures of compounds 3-chloroanilinium 2,4-dinitrobenzenesulfonate （CA-DNBS） and triethylaminium 2,4,6-trimethylbenzenesulfonate （TEA-TMBS） were determined by single-crystal X-ray diffraction studies and infrared spectroscopy.
文摘β-naphthalene sulfonic acid sodium-formaldehyde condensate is an important additive as dispersant,water reducing agent,surfactant and antioxidant in electrolytic metal manganese process.The free formaldehyde in the condensate inevitably affects its performance.The content of free formaldehyde can be determined with HPLC method by previously reacting with 2,4-dinitrophenylhydrazine to derive 2,4-dinitrophenylhydrazone.This paper optimized the reaction condition for formaldehyde derivative formation,2,4-dinitrophenylhydrazone is totally transformed form formaldehyde in 20 min,at 30℃,in hydrochloric acid.For the external standard method,the correlation coefficient(r) and RSD were 0.9999,4.07%,respectively,and the detection limit was 0.1mg/L.To spike the samples with formaldehyde at concentration of 1.25,2.50,and 7.50 mg/L,the recoveries were 98.4%,94.0% and 97.0%,respectively.
