Sudan Khartoum Refinery Co. has selected a unique route featuring delayed coking of crude in connection with the highly sour and high-calcium heavy crude extracted from Sudanese oil block No. 6.The crude oil after pre...Sudan Khartoum Refinery Co. has selected a unique route featuring delayed coking of crude in connection with the highly sour and high-calcium heavy crude extracted from Sudanese oil block No. 6.The crude oil after pretreatment for calcium removal is subjected to coking for removal of acids and metals with the coker products being further processed. The crude oil extracted from Sudanese oil block No. 6contains as high as 13 mg KOH/g of crude in addition to a calcium content of 1600 ppm. This article makes an analysis on problems related with the operation of commercial delayed coking unit for processing of highly sour crude and bring forth measures to solve these problems. The liquid yield resulted from coking of crude oil can reach 82m%, and the petroleum coke can meet the quality requirement for class 3B petroleum coke.展开更多
The feasibility of using electrodes modified with polyaniline incorporated carbon particles films for improving the precision of coulometric titration is demonstrated. The problem of large deviation produced during de...The feasibility of using electrodes modified with polyaniline incorporated carbon particles films for improving the precision of coulometric titration is demonstrated. The problem of large deviation produced during determining polyisoprene by coulometric titration with direct titration technique(double Pt electrodes indicating electrode) has been solved. In the titration process, polyisoprene alcohol, an electro-inactive species, is adsorbed on the surface of the bare Pt electrode, which inhibits the electrode reaction of Br - and Br 2. Therefore, when the titration reaches the end-point, the detected current will slowly change with time, which can make the repeatability of end-point poor. The atomic force microscopic images show the morphology of the electrode surface of adsorbing polyisoprene alcohol. The application of the chemically modified electrode instead of the bare Pt electrode to indicating the end-point has been investigated. The results show that the Pt electrode coated with polyaniline incorporated carbon particles films is an excellent indicator electrode. This electrode has advantages that the indicating signals are sharp and repeatable at end-point. The precision and the accuracy of the determination of polyisoprene alcohol are satisfactory.展开更多
文摘Sudan Khartoum Refinery Co. has selected a unique route featuring delayed coking of crude in connection with the highly sour and high-calcium heavy crude extracted from Sudanese oil block No. 6.The crude oil after pretreatment for calcium removal is subjected to coking for removal of acids and metals with the coker products being further processed. The crude oil extracted from Sudanese oil block No. 6contains as high as 13 mg KOH/g of crude in addition to a calcium content of 1600 ppm. This article makes an analysis on problems related with the operation of commercial delayed coking unit for processing of highly sour crude and bring forth measures to solve these problems. The liquid yield resulted from coking of crude oil can reach 82m%, and the petroleum coke can meet the quality requirement for class 3B petroleum coke.
基金Supported by the Science and Technology Comm ission of Henan Province and Education Com mission of HenanProvince
文摘The feasibility of using electrodes modified with polyaniline incorporated carbon particles films for improving the precision of coulometric titration is demonstrated. The problem of large deviation produced during determining polyisoprene by coulometric titration with direct titration technique(double Pt electrodes indicating electrode) has been solved. In the titration process, polyisoprene alcohol, an electro-inactive species, is adsorbed on the surface of the bare Pt electrode, which inhibits the electrode reaction of Br - and Br 2. Therefore, when the titration reaches the end-point, the detected current will slowly change with time, which can make the repeatability of end-point poor. The atomic force microscopic images show the morphology of the electrode surface of adsorbing polyisoprene alcohol. The application of the chemically modified electrode instead of the bare Pt electrode to indicating the end-point has been investigated. The results show that the Pt electrode coated with polyaniline incorporated carbon particles films is an excellent indicator electrode. This electrode has advantages that the indicating signals are sharp and repeatable at end-point. The precision and the accuracy of the determination of polyisoprene alcohol are satisfactory.
