Delayed coking is an important process consumption and light oil yield are important factors used to convert heavy oils to light products. Energy for evaluating the delayed coking process. This paper analyzes the ener...Delayed coking is an important process consumption and light oil yield are important factors used to convert heavy oils to light products. Energy for evaluating the delayed coking process. This paper analyzes the energy consumption and product yields of delayed coking units in China. The average energy consumption shows a decreasing trend in recent years. The energy consumption of different refineries varies greatly, with the average value of the highest energy consumption approximately twice that of the lowest energy consumption. The factors affecting both energy consumption and product yields were analyzed, and correlation models of energy consumption and product yields were established using a quadratic polynomial. The model coefficients were calculated through least square regression of collected industrial data of delayed coking units. Both models showed good calculation accuracy. The average absolute error of the energy consumption model was approximately 85 MJ/t, and that of the product yield model ranged from 1 wt% to 2.3 wt%. The model prediction showed that a large annual processing capacity and high load rate will result in a reduction in energy consumption.展开更多
The catalyst NiW/HSAPO-11 was prepared by impregnating Ni and W onto HSAPO-11 zeolite with two different methods. The isomerization and aromatization properties were investigated with an microreactor using n-octane ...The catalyst NiW/HSAPO-11 was prepared by impregnating Ni and W onto HSAPO-11 zeolite with two different methods. The isomerization and aromatization properties were investigated with an microreactor using n-octane as a feedstock. NiW/HSAPO-11 shows a high hydroconversion activity of n-octane, and the optimum operating parameters for the catalyst to produce high octane number products were: 400℃, 2.0MPa, VH2:Vn-octane= 400:1, liquid hourly space velocity LHSV=1.0h-1. Under the optimum reaction condition, the conversion efficiency, C5 liquid + product selectivity, isomerization and aromatization product selectivity were 69.80%, 56.95%, 79.73% and 1.29% respectively. The catalyst (S1) impregnated with Ni and W after the HSAPO-11 zeolite was combined with Al2O3 matrix, performed better than the catalyst (S2) impregnated with Ni and W before combining with the Al2O3 matrix.展开更多
Polymerization of octodecyl acrylate is studied in four solvents — carbon tetrachloride, chloroform, methylbenzene and tetrachloroethane. Experimental results indicate that the sequence of chain transfer constants i...Polymerization of octodecyl acrylate is studied in four solvents — carbon tetrachloride, chloroform, methylbenzene and tetrachloroethane. Experimental results indicate that the sequence of chain transfer constants in solvents is: carbon tetrachloride>chloroform>methylbenzene>tetrachloroethane in the polymerization of octadecyl acrylate. Influences of four solvents on solubility of polyoctadecyl acrylate prove not the same. In chloroform, polyoctadecyl acrylate shows the highest relative viscosity and the lowest chain termination rate constant. In higher conversion, the average relative molecular weight of polyoctadecyl acrylate depends mainly on the chain transfer constant of the solvent. Under the circumstance of monomer conversion higher than 30%, the viscosity effect induced by polymeric molecular shape in the solvents have a strong influence on the relative molecular weight of the polymer obtained.展开更多
文摘Delayed coking is an important process consumption and light oil yield are important factors used to convert heavy oils to light products. Energy for evaluating the delayed coking process. This paper analyzes the energy consumption and product yields of delayed coking units in China. The average energy consumption shows a decreasing trend in recent years. The energy consumption of different refineries varies greatly, with the average value of the highest energy consumption approximately twice that of the lowest energy consumption. The factors affecting both energy consumption and product yields were analyzed, and correlation models of energy consumption and product yields were established using a quadratic polynomial. The model coefficients were calculated through least square regression of collected industrial data of delayed coking units. Both models showed good calculation accuracy. The average absolute error of the energy consumption model was approximately 85 MJ/t, and that of the product yield model ranged from 1 wt% to 2.3 wt%. The model prediction showed that a large annual processing capacity and high load rate will result in a reduction in energy consumption.
文摘The catalyst NiW/HSAPO-11 was prepared by impregnating Ni and W onto HSAPO-11 zeolite with two different methods. The isomerization and aromatization properties were investigated with an microreactor using n-octane as a feedstock. NiW/HSAPO-11 shows a high hydroconversion activity of n-octane, and the optimum operating parameters for the catalyst to produce high octane number products were: 400℃, 2.0MPa, VH2:Vn-octane= 400:1, liquid hourly space velocity LHSV=1.0h-1. Under the optimum reaction condition, the conversion efficiency, C5 liquid + product selectivity, isomerization and aromatization product selectivity were 69.80%, 56.95%, 79.73% and 1.29% respectively. The catalyst (S1) impregnated with Ni and W after the HSAPO-11 zeolite was combined with Al2O3 matrix, performed better than the catalyst (S2) impregnated with Ni and W before combining with the Al2O3 matrix.
文摘Polymerization of octodecyl acrylate is studied in four solvents — carbon tetrachloride, chloroform, methylbenzene and tetrachloroethane. Experimental results indicate that the sequence of chain transfer constants in solvents is: carbon tetrachloride>chloroform>methylbenzene>tetrachloroethane in the polymerization of octadecyl acrylate. Influences of four solvents on solubility of polyoctadecyl acrylate prove not the same. In chloroform, polyoctadecyl acrylate shows the highest relative viscosity and the lowest chain termination rate constant. In higher conversion, the average relative molecular weight of polyoctadecyl acrylate depends mainly on the chain transfer constant of the solvent. Under the circumstance of monomer conversion higher than 30%, the viscosity effect induced by polymeric molecular shape in the solvents have a strong influence on the relative molecular weight of the polymer obtained.
