Energy and Fuels,2003年17(2):344-347 ISSN：0887-0624
[Wang, YF] Cent S Inst Technol, Dept Chem Engn, Hengyang 421001, Hunan, Peoples R China.;Petr Univ China, Natl Lab Heavy Oil Proc, Shandong 257062, Peoples R China.;E China Univ Sci & Technol, Shanghai 200237, Peoples R China.
[Wang, YF] Cent S Inst Technol, Dept Chem Engn, Hengyang 421001, Hunan, Peoples R China.
VR (vacuum residua) and CCB oil (catalytic cracking bottom oil) are complex mixtures of hydrocarbons. The investigation of the compatibility and the incompatibility of them is helpful to optimize the ratio of CCB oil/VR in FCC processing and VR solvent deasphalting processing to prevent troubles. In the present work, the mixture property of VR with CCB oil was studied from the standpoint of colloidal dispersion in several different experiments. The investigation shows that in the course of CCB oil being blended with VR, there are two competitive processes of dissolution and flocculation, and the CCB oil's function is to act as both solvent and dispersant. At a low blending ratio of CCB oil, flocculation is almost balanced with dissolution; VR is almost compatible with CCB oil. When the blending ratio of CCB oil is increased, the solvation and dispersal powers of the CCB oil break through the tolerance limit of VR colloidal system, and flocculation predominates over dissolution, which leads to phase separation in the colloidal system and to deposition of the asphaltenes. Under this condition, VR is incompatible with CCB oil.
Poly(cyclotriphosphazene-co-4,4′-diaminodiphenyl ether) crosslinked microspheres with active amino groups on the surface were prepared by one-step precipitation polymerization method. The as-prepared material were characterized by means of FTIR, XPS, XRD, EDS and SEM. The effects of pH, time of contact, dosage, initial concentration and temperature on the adsorption of uranium(VI) by the crosslinked microspheres were studied, and the adsorption mechanism was elucidated. Under the optimized adsorption conditions, the adsorption removal efficiency reached 97.03%. The experimental results fit the Langmuir isotherm model and adsorption processes comply with the pseudo-second-order kinetic model. Thermodynamic data revealed that the adsorption behavior of uranium(VI) on the microspheres was spontaneous and exothermic.
Two nitronyl nitroxide radical NIT 2PhMe 2 (1), 2, 5-dimethyl-l, 4-bis(nitronyl nitroxide) benzene and NITPhNMe 3 · I · H 2O (2), hydrous iodide m-N, N' , N" -trimethyl-benzenaminium nitronyl nitroxide, have been synthesized and structurally characterized. The compound 1 crystallized in monoclinic, space group P2 1/c with a=0.6137(4) nm, b = 1.766 2(12) nm, c = 1.180 9(6) nm, ß=117.66(3)°, V=1.1337(13) nm 3, M r=416.52, Z=2 and F (000)=456. The compound 2 also crystallized in monoclinic, space group P2 1/c with a=1.143 47 (11) nm, b = 1.119 09 (11) nm, c = 1.527 38 (15) nm, ß=101.766 (2)°, V=1.9134 (3) nm 3, M r=436.31, Z=4 and F (000)=884. Through the weak hydrogen bond, 1 and 2 form three-demensional supramolecular networks, respectively. CCDC: 749328, 1; 749329, 2.