In order to optimize the performance of delay composition containing barium chromate,the preparation conditions of barium chromate were optimized,and S/BaCrO 4/KClO 4 delay composition was prepared by co-precipitation...In order to optimize the performance of delay composition containing barium chromate,the preparation conditions of barium chromate were optimized,and S/BaCrO 4/KClO 4 delay composition was prepared by co-precipitation using barium chromate as precipitant.Then,the ignition temperature,delay time and other burning performance were tested.The results show that the ignition temperature of S/BaCrO 4/KClO 4 delay composition prepared by co-precipitation method is higher than that by traditional mechanical mixing method;the burning rate is faster and the burning time precision is higher because co-precipitation method can make the components mix more evenly.This co-precipitation method with barium chromate can be extended to the preparation of other mixed explosive agents containing barium chromate.展开更多
Delayed coking is an important petroleum resid conversion process.The processability of coking liquids is known to be dependent on the heteroatom compounds present in the coking liquids.Eight commercial delayed coking...Delayed coking is an important petroleum resid conversion process.The processability of coking liquids is known to be dependent on the heteroatom compounds present in the coking liquids.Eight commercial delayed coking liquids were characterized by electrospray ionization(ESI)Fourier transform ion cyclotron resonance mass spectrometry(ESI FT-ICR MS)and gas chromatographic techniques.High relatively abundant heteroatom compounds in the coking liquids were 1-4 aromatic-ring pyridinic nitrogen compounds,carbazoles,benzocarbazoles,phenols,mercaptans,benzothiophenes,dibenzothiophenes,and naphthobenzothiophenes.Coking liquids derived from various feeds had similar compound class types,molecular weight distribution ranges,and double bond equivalents(DBE).However,the concentration of individual compounds and the distribution of DBE versus carbon number of heteroatom compounds varied.A comparison of heteroatom compounds in coker feeds and products revealed the various reaction mechanism of heteroatom compounds occurred during the coking process.The results suggested that molecular-level process models can be developed for optimization of unit operation to obtain desirable products that meet the environmental specifications and quality requirements.展开更多
文摘In order to optimize the performance of delay composition containing barium chromate,the preparation conditions of barium chromate were optimized,and S/BaCrO 4/KClO 4 delay composition was prepared by co-precipitation using barium chromate as precipitant.Then,the ignition temperature,delay time and other burning performance were tested.The results show that the ignition temperature of S/BaCrO 4/KClO 4 delay composition prepared by co-precipitation method is higher than that by traditional mechanical mixing method;the burning rate is faster and the burning time precision is higher because co-precipitation method can make the components mix more evenly.This co-precipitation method with barium chromate can be extended to the preparation of other mixed explosive agents containing barium chromate.
基金supported by the National Natural Science Foundation of China(U1162204,21236009,21376262)
文摘Delayed coking is an important petroleum resid conversion process.The processability of coking liquids is known to be dependent on the heteroatom compounds present in the coking liquids.Eight commercial delayed coking liquids were characterized by electrospray ionization(ESI)Fourier transform ion cyclotron resonance mass spectrometry(ESI FT-ICR MS)and gas chromatographic techniques.High relatively abundant heteroatom compounds in the coking liquids were 1-4 aromatic-ring pyridinic nitrogen compounds,carbazoles,benzocarbazoles,phenols,mercaptans,benzothiophenes,dibenzothiophenes,and naphthobenzothiophenes.Coking liquids derived from various feeds had similar compound class types,molecular weight distribution ranges,and double bond equivalents(DBE).However,the concentration of individual compounds and the distribution of DBE versus carbon number of heteroatom compounds varied.A comparison of heteroatom compounds in coker feeds and products revealed the various reaction mechanism of heteroatom compounds occurred during the coking process.The results suggested that molecular-level process models can be developed for optimization of unit operation to obtain desirable products that meet the environmental specifications and quality requirements.
