This article focuses on the hydrocracking technology for upgrading the quality of tail oil and the first commercial application of the RN-32V/RHC- 1 catalysts in the 1.0 Mt/a hydrocracker at the Yangzi Petrochemical C...This article focuses on the hydrocracking technology for upgrading the quality of tail oil and the first commercial application of the RN-32V/RHC- 1 catalysts in the 1.0 Mt/a hydrocracker at the Yangzi Petrochemical Company, which was started up successfully in September 2008. One month after start-up of the hydrocracking unit, an evaluation opera- tion has been conducted fbr assessing the catalysts performance. The technical calibration results showed that the RN- 32V/RHC-1 catalysts had high activity, and the product yield distribution was reasonable. The hydrocracker can provide abundant feedstocks for the downstream aromatic production unit and ethylene production unit.展开更多
The quality of Yi＇an gas coal before and after low temperature upgrading under either a N2 or H2 atmosphere was examined by thermogravimetric and infrared analyses. The effect of upgrading on the prepared coke qualit...The quality of Yi＇an gas coal before and after low temperature upgrading under either a N2 or H2 atmosphere was examined by thermogravimetric and infrared analyses. The effect of upgrading on the prepared coke quality was analyzed. The results show that the carboxyl and phenolic hydroxyls in the coal molecular structure are removed after upgrading by low temperature pyrolysis under either N2 or Hz atmospheres. This improves coal caking properties to a certain extent. The upgrading effect under a Hz atmosphere is remarkably better than the effect observed after upgrading under N2. Compared to coke obtained from raw coal, the compressiveand micro-strength of the cokes obtained from upgraded coal are greatly improved. The effect on coke reactivity with CO2 is not significant. The best upgrading temperature for Yi＇an gas coal under either a N2 or H2 atmosphere is 250 or 275 ℃ respectively.展开更多
The Chongqing Cereals, Oils & Foodstuffs Import and Export Corporation is a key professional foreign trade company in Chongqing City, Sichuan Province. With a 38-year history, the company has grown into one of Ch...The Chongqing Cereals, Oils & Foodstuffs Import and Export Corporation is a key professional foreign trade company in Chongqing City, Sichuan Province. With a 38-year history, the company has grown into one of China’s Top 500 foreign trading companies. The commodities handled by the company have increased from an original few in the 1950s into hundreds. Chemical products, medical products,展开更多
During the Eighth Five-Year Plan period, (1991-95), China’s pen industry maintained sustained, rapid, stable and sound development with the further promotion of product quality and grade in production, and its techno...During the Eighth Five-Year Plan period, (1991-95), China’s pen industry maintained sustained, rapid, stable and sound development with the further promotion of product quality and grade in production, and its technological advancement. At the same time, new varieties of products and more patterns and specifications were developed. The industry also further developed its business ties with clients abroad and ex-展开更多
Asphaltene precipitation during solvent-based enhanced oil recovery under reservoir conditions impedes production efficiency and degrades oil quality.This study aims to optimize solvent-to-oil mass ratios to mitigate ...Asphaltene precipitation during solvent-based enhanced oil recovery under reservoir conditions impedes production efficiency and degrades oil quality.This study aims to optimize solvent-to-oil mass ratios to mitigate asphaltene issues and enhance oil upgrading.Experiments using a high-pressure cell simulating reservoir environments were conducted with solvent-to-oil ratios of 3:1,5:1,7:1,and 9:1 at temperatures of 120℃ and 250℃.Increasing the ratio from 3:1 to 7:1 significantly enhanced in-situ asphaltene precipitation,but further increase to 9:1 offered minimal additional benefit,indicating a plateau.Concurrently,the asphaltene content in upgraded oil decreased with higher ratios,stabilizing beyond 7:1.At 250℃,a substantial reduction in total asphaltene content-averaging a 5.8 wt%decreasewas observed.The discovery of the plateau at 7:1 and the reduced asphaltene precipitation at elevated temperatures provides a novel perspective on balancing solvent use with operational efficiency.These findings contribute to cost-effective and environmentally sustainable practices in enhanced oil recovery operations.These findings identify an optimal solvent-to-oil ratio and temperature under reservoir conditions for maximizing asphaltene precipitation and minimizing asphaltene content in upgraded oil.Optimizing these parameters is crucial for effective asphaltene management and improving the efficiency of solvent-based enhanced oil recovery processes.展开更多
文摘This article focuses on the hydrocracking technology for upgrading the quality of tail oil and the first commercial application of the RN-32V/RHC- 1 catalysts in the 1.0 Mt/a hydrocracker at the Yangzi Petrochemical Company, which was started up successfully in September 2008. One month after start-up of the hydrocracking unit, an evaluation opera- tion has been conducted fbr assessing the catalysts performance. The technical calibration results showed that the RN- 32V/RHC-1 catalysts had high activity, and the product yield distribution was reasonable. The hydrocracker can provide abundant feedstocks for the downstream aromatic production unit and ethylene production unit.
文摘The quality of Yi＇an gas coal before and after low temperature upgrading under either a N2 or H2 atmosphere was examined by thermogravimetric and infrared analyses. The effect of upgrading on the prepared coke quality was analyzed. The results show that the carboxyl and phenolic hydroxyls in the coal molecular structure are removed after upgrading by low temperature pyrolysis under either N2 or Hz atmospheres. This improves coal caking properties to a certain extent. The upgrading effect under a Hz atmosphere is remarkably better than the effect observed after upgrading under N2. Compared to coke obtained from raw coal, the compressiveand micro-strength of the cokes obtained from upgraded coal are greatly improved. The effect on coke reactivity with CO2 is not significant. The best upgrading temperature for Yi＇an gas coal under either a N2 or H2 atmosphere is 250 or 275 ℃ respectively.
文摘The Chongqing Cereals, Oils & Foodstuffs Import and Export Corporation is a key professional foreign trade company in Chongqing City, Sichuan Province. With a 38-year history, the company has grown into one of China’s Top 500 foreign trading companies. The commodities handled by the company have increased from an original few in the 1950s into hundreds. Chemical products, medical products,
文摘During the Eighth Five-Year Plan period, (1991-95), China’s pen industry maintained sustained, rapid, stable and sound development with the further promotion of product quality and grade in production, and its technological advancement. At the same time, new varieties of products and more patterns and specifications were developed. The industry also further developed its business ties with clients abroad and ex-
文摘Asphaltene precipitation during solvent-based enhanced oil recovery under reservoir conditions impedes production efficiency and degrades oil quality.This study aims to optimize solvent-to-oil mass ratios to mitigate asphaltene issues and enhance oil upgrading.Experiments using a high-pressure cell simulating reservoir environments were conducted with solvent-to-oil ratios of 3:1,5:1,7:1,and 9:1 at temperatures of 120℃ and 250℃.Increasing the ratio from 3:1 to 7:1 significantly enhanced in-situ asphaltene precipitation,but further increase to 9:1 offered minimal additional benefit,indicating a plateau.Concurrently,the asphaltene content in upgraded oil decreased with higher ratios,stabilizing beyond 7:1.At 250℃,a substantial reduction in total asphaltene content-averaging a 5.8 wt%decreasewas observed.The discovery of the plateau at 7:1 and the reduced asphaltene precipitation at elevated temperatures provides a novel perspective on balancing solvent use with operational efficiency.These findings contribute to cost-effective and environmentally sustainable practices in enhanced oil recovery operations.These findings identify an optimal solvent-to-oil ratio and temperature under reservoir conditions for maximizing asphaltene precipitation and minimizing asphaltene content in upgraded oil.Optimizing these parameters is crucial for effective asphaltene management and improving the efficiency of solvent-based enhanced oil recovery processes.
