Thermal and catalytic cracking of whole crude oils at high severity

被引:50
|
作者
Al-Absi, Akram A. [1 ]
Aitani, Abdullah M. [2 ]
Al-Khattaf, Sulaiman S. [3 ]
机构
[1] Univ Calgary, Schulich Sch Engn, Dept Chem & Petr Engn, Calgary, AB T2N 1N4, Canada
[2] King Fahd Univ Petr & Minerals, Ctr Refining & Petrochem, Res Inst, Dhahran 31261, Saudi Arabia
[3] Tasnee Petrochem, Natl Industrializat Co, Jubail Ind City 31961, Saudi Arabia
关键词
Crude oil; Catalytic cracking; Thermal cracking; Light olefins; Ethylene; Propylene; LIGHT OLEFINS; FCC; ZSM-5; CONVERSION; ZEOLITES; NAPHTHA; HZSM-5;
D O I
10.1016/j.jaap.2019.104705
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
The catalytic and thermal cracking of three types of whole crude oils, having API gravity at 34 degrees (AL), 39 degrees (AXL) and 51 degrees (ASL), were investigated via a fixed-bed micro-activity test (MAT) unit at high temperature between 600 and 650 degrees C. Equilibrium FCC catalyst (E-Cat)/ZSM-5 additive was used for catalytic cracking tests at 30 s and catalyst/oil (C/O) ratio of 2.0-6.0. For both thermal and catalytic cracking of all crude oils, the increase in reaction temperature resulted in higher conversion and enhanced yields of C-2-C-4 light olefins, LPG, coke, and dry gas at the expense of naphtha, heavy cycle oil (HCO), and light cycle oil (LCO). In thermal cracking, the yields of C-2-C-4 olefins at 650 degrees C were as follows: AL (22.8 wt.%) > AXL (19.0 wt.%) > ASL (18.8 wt.%) associated with naphtha yields of 34.4, 38.1 and 48.0 wt.%, respectively. Compared with thermal, catalytic cracking over E-Cat/ZSM-5 enhanced conversion, doubled the yields of light olefins and showed an increase in aromatics content of naphtha fraction. Contrary to thermal cracking, the yields of C-2-C-4 olefins in catalytic cracking were as follows: ASL (42.9 wt.%) > AXL (41 wt.%) > AL (39.1 wt.%) associated with naphtha yields of 31.7, 27.5, and 23.0 wt. %, respectively.
引用
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页数:11
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