The computer molecular simulation technique was applied to study the chemisorption of thiophene and tetramethylthiophene as the model sulfides on the simple oxides and complex oxides of some transition metals as the c...The computer molecular simulation technique was applied to study the chemisorption of thiophene and tetramethylthiophene as the model sulfides on the simple oxides and complex oxides of some transition metals as the catalytic materials. The study disclosed that the thiophene sulfides could enter into chemisorption with metal oxides such as VO, ZnO, NiO and Zn-Al-spinel. This interaction could lead to thiophene molecular structure deformation to be in an activated adsorption state, which could help to promote the conversion of thiophene sulfides in the course of catalytic cracking. The VO with a valence of 2 could provide relatively strong selective adsorption sites for the conversion of thiophene sulfides to apparently transform the molecular structures and electron cloud states of such heterocyclic sulfur compounds such as thiophene and tetramethylthiophene into an activated adsorption state. The effect of this interaction was more pronounced with respect to tetramethylthiophene.展开更多
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
A method for determinaiton of sulfur content at ppb leve in light oils is proposed .The key technique of the method inluces the design of a new of pyrolysis tube,which is charactierized by large capctiy and nested str...A method for determinaiton of sulfur content at ppb leve in light oils is proposed .The key technique of the method inluces the design of a new of pyrolysis tube,which is charactierized by large capctiy and nested struchture ,and the optimization of operation conditions.The achiveable lowest detection limit is 50ng/g.For the samples in which the sulfur content is less than 1 mg/L,This method features better precision and accuracy,good linearity and quicker test speed.展开更多
This article focuses on the routes for development of oilfield chemicals by making use of the feedstock advantages of the petrochemical industry,The diversification of oilfield chemicals has resulted in thousand produ...This article focuses on the routes for development of oilfield chemicals by making use of the feedstock advantages of the petrochemical industry,The diversification of oilfield chemicals has resulted in thousand product grades.Because there are hundred domestic producers of oilfield chemicals.moslty medium and small producers.the fluctuations of feedstock prices and product quality cannot be conducive to the application and development of oilfield chemicals.This article illustrates the feasibility of oilfield chemical production by sate-rum mnedium and large petrochemical enterprises by allowing full play their own advantages in petrochemical feedstocks.展开更多
文摘The computer molecular simulation technique was applied to study the chemisorption of thiophene and tetramethylthiophene as the model sulfides on the simple oxides and complex oxides of some transition metals as the catalytic materials. The study disclosed that the thiophene sulfides could enter into chemisorption with metal oxides such as VO, ZnO, NiO and Zn-Al-spinel. This interaction could lead to thiophene molecular structure deformation to be in an activated adsorption state, which could help to promote the conversion of thiophene sulfides in the course of catalytic cracking. The VO with a valence of 2 could provide relatively strong selective adsorption sites for the conversion of thiophene sulfides to apparently transform the molecular structures and electron cloud states of such heterocyclic sulfur compounds such as thiophene and tetramethylthiophene into an activated adsorption state. The effect of this interaction was more pronounced with respect to tetramethylthiophene.
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.
文摘A method for determinaiton of sulfur content at ppb leve in light oils is proposed .The key technique of the method inluces the design of a new of pyrolysis tube,which is charactierized by large capctiy and nested struchture ,and the optimization of operation conditions.The achiveable lowest detection limit is 50ng/g.For the samples in which the sulfur content is less than 1 mg/L,This method features better precision and accuracy,good linearity and quicker test speed.
文摘This article focuses on the routes for development of oilfield chemicals by making use of the feedstock advantages of the petrochemical industry,The diversification of oilfield chemicals has resulted in thousand product grades.Because there are hundred domestic producers of oilfield chemicals.moslty medium and small producers.the fluctuations of feedstock prices and product quality cannot be conducive to the application and development of oilfield chemicals.This article illustrates the feasibility of oilfield chemical production by sate-rum mnedium and large petrochemical enterprises by allowing full play their own advantages in petrochemical feedstocks.
