降低减压渣油延迟焦化石油焦产品硫含量的研究

基于砜与亚砜的化学键键能低于噻吩的化学键键能,提出采用乙酸双氧水氧化体系对减压渣油进行预氧化处理以降低延迟焦化石油焦产品的硫含量,同时考察了氧化减黏、水力空化强化氧化-减黏等工艺对延迟焦化石油焦硫含量的影响。结果表明,在水力空化压力8MPa下处理1次,并在410℃下减黏1h时石油焦硫含量的降低效果最佳,硫质量分数由初始的4.12%降低至3.21%,同时产品分布数据表明,此条件下石油焦产率降低2.35百分点,液体收率提高1.93百分点。

STUDY ON DESULFURIZATION OF PETROLEUM COKE FROM VACUUM RESIDUE DELAYED COKER

Based on the knowledge that the chemical bond energy of sulfone and sulfone is lower than that of thiophene, it was proposed that the vacuum residue was pre-oxidized to reduce the sulfur content of the coke from delayed coking with acetic acid/hydrogen peroxide oxidation system. The effect of viscosity reduction by oxidation and the oxidation-viscosity reduction process assisted with hydrodynamic cavitation technology on the desulfurization of the petroleum coke were investigated. The results showed that the desulfurization of petroleum coke reached the best at the reaction conditions: cavitation pressure of 8 MPa，400℃，reaction time 1 h, and treating only once. The sulfur content of petroleum coke was reduced from 4.12% to 3.21%，and the coke yield reduced by 2.35 percentage points，the liquid yield increased by 1.93 percentage points.