The upgrading of diesel oil to produce ethylene rich cracking feedstock is an important and promising technical route to reduce the ratio of diesel to gasoline. In the present work, a hydrocracking catalyst suitable f...The upgrading of diesel oil to produce ethylene rich cracking feedstock is an important and promising technical route to reduce the ratio of diesel to gasoline. In the present work, a hydrocracking catalyst suitable for selective hydrocracking of straight run diesel oil to produce high-quality ethylene cracking feedstock at low cost was developed, by optimizing the composition of catalyst support materials, using amorphous silicon aluminum and aluminum oxide with high mesopore content as the main support, and modified Y zeolite with excellent aromatic ring opening selectivity as the acidic component. The catalyst has in-depth characterized by X-ray diffraction, transmission electron microscopy, scanning electron microscopy, N<sub>2</sub>-low temperature adsorption-desorption, NH<sub>3</sub>-temperature-programmed desorption, and IR techniques. And its catalytic cracking straight run diesel oil performance was evaluated. The results show that the prepared catalyst has high polycyclic aromatic hydrocarbon ring opening cracking selectivity. However, alkanes retained in diesel distillates can achieve the goal of producing more ethylene cracking feedstocks with low BMCI value under low and moderate pressure conditions. This work may shed significant technical insight for oil refining transformation.展开更多
The green deacidification technology of diesel by the ammonia-alcohol method without using strong acid and strong base can achieve zero-emission.But it has some problems,such as requiring larger amounts of ammonia and...The green deacidification technology of diesel by the ammonia-alcohol method without using strong acid and strong base can achieve zero-emission.But it has some problems,such as requiring larger amounts of ammonia and solvent,and higher energy consumption of regeneration solvent.To overcome the shortcomings of the ammonia-alcohol method,this paper experimentally studied the green deacidification technology of diesel by the ammonia-alcohol method,which used low-temperature coalescence filtration in a self-made experimental device.The effects of coalescence filtration temperature,amount of ammonia,alcohol consumption,volume ratio of solvent to oil on the deacidification process,material regeneration of coalescence filtration,deacidification’s turndown ratio and the product quality of naphthenic acid were studied.The results showed that under the optimum operation condition,the acidity of straight-run diesel could decrease from 62.9 mg KOH·(100 ml)-1 to 4.2 mg KOH·(100 ml)-1,the acid removal rate was as high as 93.3%,and product recovery could reach 98.6%.After refining,the quality of diesel could meet industry requirements [acidity X<7.0 mg KOH·(100 ml)-1],and raw acid value of naphthenic acid could meet No.2 acid standards of SH/T 0530—92.This method had the advantages of simple technological process,low operating temperature of deacidification,less ammonia and solvent consumption,low solvent regeneration energy consumption and higher turndown ratio.展开更多
文摘The upgrading of diesel oil to produce ethylene rich cracking feedstock is an important and promising technical route to reduce the ratio of diesel to gasoline. In the present work, a hydrocracking catalyst suitable for selective hydrocracking of straight run diesel oil to produce high-quality ethylene cracking feedstock at low cost was developed, by optimizing the composition of catalyst support materials, using amorphous silicon aluminum and aluminum oxide with high mesopore content as the main support, and modified Y zeolite with excellent aromatic ring opening selectivity as the acidic component. The catalyst has in-depth characterized by X-ray diffraction, transmission electron microscopy, scanning electron microscopy, N<sub>2</sub>-low temperature adsorption-desorption, NH<sub>3</sub>-temperature-programmed desorption, and IR techniques. And its catalytic cracking straight run diesel oil performance was evaluated. The results show that the prepared catalyst has high polycyclic aromatic hydrocarbon ring opening cracking selectivity. However, alkanes retained in diesel distillates can achieve the goal of producing more ethylene cracking feedstocks with low BMCI value under low and moderate pressure conditions. This work may shed significant technical insight for oil refining transformation.
文摘The green deacidification technology of diesel by the ammonia-alcohol method without using strong acid and strong base can achieve zero-emission.But it has some problems,such as requiring larger amounts of ammonia and solvent,and higher energy consumption of regeneration solvent.To overcome the shortcomings of the ammonia-alcohol method,this paper experimentally studied the green deacidification technology of diesel by the ammonia-alcohol method,which used low-temperature coalescence filtration in a self-made experimental device.The effects of coalescence filtration temperature,amount of ammonia,alcohol consumption,volume ratio of solvent to oil on the deacidification process,material regeneration of coalescence filtration,deacidification’s turndown ratio and the product quality of naphthenic acid were studied.The results showed that under the optimum operation condition,the acidity of straight-run diesel could decrease from 62.9 mg KOH·(100 ml)-1 to 4.2 mg KOH·(100 ml)-1,the acid removal rate was as high as 93.3%,and product recovery could reach 98.6%.After refining,the quality of diesel could meet industry requirements [acidity X<7.0 mg KOH·(100 ml)-1],and raw acid value of naphthenic acid could meet No.2 acid standards of SH/T 0530—92.This method had the advantages of simple technological process,low operating temperature of deacidification,less ammonia and solvent consumption,low solvent regeneration energy consumption and higher turndown ratio.
