高酸值重油热反应的影响因素探讨

STUDY ON FACTORS INFLUENCING THERMAL REACTION OF HIGH ACID NUMBER HEAVY OIL

随着高酸渣油加工量的逐渐增加,高酸渣油加工过程中生焦量高、轻油收率低等问题日益受到关注。为深入认识酸值、沥青质含量等因素对高酸渣油热加工的影响,研究了羧酸、沥青质、金属、自由基引发剂、焦粉、催化裂化油浆等因素对代表性混合重油热反应的影响,证明了羧酸、自由基引发剂、焦粉的加入在一定程度上可促进重油的热裂化反应,而沥青质、金属等促进了重油的热缩合生焦反应,其中沥青质促进生焦更明显。高酸值重油热反应生焦量高不是由所含羧酸引起的,而主要由沥青质含量、残炭等自身性质决定。

The processing volume of high acid number residue oil is gradually increasing,and the problems of high yield of coke and low yield of light oils during processing of high acidic residue oil is attracting more attention.Up to now,there is still lack of clear and consistent understanding about the effects of acidity,asphaltene content and other factors on the thermal behavior of high acidic residue.The effects of carboxylic acid,asphaltene,metal,free radical initiator,coke powder,catalytic slurry on the thermal reaction of representative mixed heavy oil were compared.It was proved that the addition of carboxylic acid,free radical initiators and coke powder into heavy oil promoted the thermal cracking of heavy oil to a certain extent.While asphaltene,metal and the like accelerated the thermal condensation of heavy oil to coke,among which the asphaltene promoted the coke formation more obviously.The results show that the high coke yield of high acidic heavy oil is not caused by the carboxylic acid contained,but by the nature of asphaltene and carbon residue.