HYDROTHERMAL CRACKING OF RESIDUAL OILS
注意：本论文已在《Sekiyu Gakkaishi (J. Japan Petrol.
Inst.) 》 43 (1), pp.25. 发表
Noritatsu TSUBAKI, Jie CHANG, and Kaoru FUJIMOTO
Department of Applied Chemistry, School of Engineering, The University of Tokyo
7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, JAPAN
With the growing demand for high quality transportation fuels and middle distillate products, to obtain high conversion from heavy oil and bitumen is becoming the predominant research target of resid upgrading processes. Hydrothermal cracking has been developed to obtain maximum middle distillate yield (kerosene + gas oil) from residual oil [1-3]. It involves free radical chain reactions and catalytic hydrogenation reactions: (1) C-C and C-X (heteroatom) bonds rupture to produce free radicals; (2) free radical dissociation to produce low-boiling products; (3) catalytic hydrogenation to terminate radicals, remove heteroelements and saturate C-C bonds such as olefin and aromatic etc [4-5].
The decomposition of resid is thermodynamically favored at high reaction temperature. With the increase of temperature, the selectivity of by-products, coke and gaseous hydrocarbon, will be increased, and therefore the selectivity of middle distillate will be lowered. How to obtain high conversion at low reaction temperature is the key point to resolve this contradiction. According to the mechanism of free radical chain reactions, some effective initiators may enhance the conversion of residue by increasing the concentration of free radicals. The present work showed the effect of the addition of free radical initiators, di-tert-butyl-peroxide (DTBP) and sulfur, on the decomposition of resids and model compound. Both remarkably enhanced the conversion of heavy oil.
1、Effect of Addition of K to Ni/SiO2 and Ni/Al2O3 Catalysts on Hydrothermal Cracking of Bitumen
2、Initiation Effect of Local Heating in Hydro-Thermal Cracking of Resids
3、The Promotional Effect of Initiators in Hydro-thermal Cracking of Resids
5、Enhancement effect of free radical initiator on hydro-thermal cracking of heavy oil and model compound