A vapor liquid equilibrium model and its related interactive energy parameters based on UNIQUAC model for the H2O-NH3-CO2 system without solid phase at the conditions of temperature from 30℃ to 90℃, pressure from 0....A vapor liquid equilibrium model and its related interactive energy parameters based on UNIQUAC model for the H2O-NH3-CO2 system without solid phase at the conditions of temperature from 30℃ to 90℃, pressure from 0.1 MPa to 0.4 MPa, and the maximum NH3 mass fraction up to 0.4 are provided. This model agrees with experimental data well (average relative error < 1%) and is useful for analysis of industrial urea production.展开更多
Solubilities and properties (density, conductivity and pH value) of solutions in the quaternary system Li +,K +//CO 2- 3,B 4O 2- 7-H 2O at 288 K were experimentally studied with the isothermal equilibrium method. The ...Solubilities and properties (density, conductivity and pH value) of solutions in the quaternary system Li +,K +//CO 2- 3,B 4O 2- 7-H 2O at 288 K were experimentally studied with the isothermal equilibrium method. The phase diagram of the system consisted of two invariant points E and F, five univariant curves, and four crystallization fields that belonged to K 2CO 3·3/2H 2O,Li 2 B 4O 7·3H 2O, K 2 B 4O 7 ·4H 2O and Li 2CO 3. The composition of the solution corresponding to E was w(CO 2- 3)=2.27 %, w(B 4O 2- 7) =6.05 %, w(K + ) =4.30%,w(Li + )=0.30 % and the equilibrium solids were Li 2 B 4O 7· 3H 2O+K 2 B 4O 7·4H 2O+Li 2CO 3;The composition of the solution for F was w(CO 2- 3) =22.45%,w(B 4O 2- 7)=1.88%,w(K + )=29.96%,w(Li + )=0.03% and the equilibrium solids were K 2CO 3·3/2H 2O+ K 2 B 4O 7·4H 2O+Li 2CO 3. K 2CO 3 possesses strong salting-out effect on K 2 B 4O 7,Li 2CO 3 and Li 2 B 4O 7.展开更多
Co(en) 3V 3O 6·H 2O has been synthesized by using hydrothermal method and characterized by IR, ICP, XPS and X ray diffraction analysis. The results of the X ray diffraction analysis show that structure of Co(en) ...Co(en) 3V 3O 6·H 2O has been synthesized by using hydrothermal method and characterized by IR, ICP, XPS and X ray diffraction analysis. The results of the X ray diffraction analysis show that structure of Co(en) 3(VO 3) 3·H 2O is orthorhombic with P2(1)2(1)2(1) , and the crystal data are a =0 819 2(7) nm, b =1.263 9(1) nm, c =1.804 8(2) nm, V =1.868 8(3) nm 3, Z=4, D c=1.973 g/cm 3, F (000)=1 124, R 1=0.040 7, wR 2=0.094 9, ( Δ/ρ ) max =706 e/nm 3 and ( Δ/ρ ) min =-452 e/nm 3. The results of XPS show that the Co 2+ was oxidized to Co 3+ (en) 3 at about pH=7.0 in the aqueous solution.展开更多
文摘A vapor liquid equilibrium model and its related interactive energy parameters based on UNIQUAC model for the H2O-NH3-CO2 system without solid phase at the conditions of temperature from 30℃ to 90℃, pressure from 0.1 MPa to 0.4 MPa, and the maximum NH3 mass fraction up to 0.4 are provided. This model agrees with experimental data well (average relative error < 1%) and is useful for analysis of industrial urea production.
文摘Solubilities and properties (density, conductivity and pH value) of solutions in the quaternary system Li +,K +//CO 2- 3,B 4O 2- 7-H 2O at 288 K were experimentally studied with the isothermal equilibrium method. The phase diagram of the system consisted of two invariant points E and F, five univariant curves, and four crystallization fields that belonged to K 2CO 3·3/2H 2O,Li 2 B 4O 7·3H 2O, K 2 B 4O 7 ·4H 2O and Li 2CO 3. The composition of the solution corresponding to E was w(CO 2- 3)=2.27 %, w(B 4O 2- 7) =6.05 %, w(K + ) =4.30%,w(Li + )=0.30 % and the equilibrium solids were Li 2 B 4O 7· 3H 2O+K 2 B 4O 7·4H 2O+Li 2CO 3;The composition of the solution for F was w(CO 2- 3) =22.45%,w(B 4O 2- 7)=1.88%,w(K + )=29.96%,w(Li + )=0.03% and the equilibrium solids were K 2CO 3·3/2H 2O+ K 2 B 4O 7·4H 2O+Li 2CO 3. K 2CO 3 possesses strong salting-out effect on K 2 B 4O 7,Li 2CO 3 and Li 2 B 4O 7.
文摘Co(en) 3V 3O 6·H 2O has been synthesized by using hydrothermal method and characterized by IR, ICP, XPS and X ray diffraction analysis. The results of the X ray diffraction analysis show that structure of Co(en) 3(VO 3) 3·H 2O is orthorhombic with P2(1)2(1)2(1) , and the crystal data are a =0 819 2(7) nm, b =1.263 9(1) nm, c =1.804 8(2) nm, V =1.868 8(3) nm 3, Z=4, D c=1.973 g/cm 3, F (000)=1 124, R 1=0.040 7, wR 2=0.094 9, ( Δ/ρ ) max =706 e/nm 3 and ( Δ/ρ ) min =-452 e/nm 3. The results of XPS show that the Co 2+ was oxidized to Co 3+ (en) 3 at about pH=7.0 in the aqueous solution.
