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HYDROTHERMAL CRACKING OF RESIDUAL OILS

注意:本論文已在《Sekiyu Gakkaishi (J. Japan Petrol. Inst.) 》 43 (1), pp.25. 發表
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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

INTRODUCTION
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.

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作者點評:

   從反應機理上可以將石油煉制工藝分為兩大類:加氫和脫碳。加氫工藝包括加氫處理和加氫裂化等。脫碳工藝包括催化裂化、熱裂化和焦化等。但其目的都是提高產品的H/C比,脫除硫、氮、氧和金屬等雜原子。針對國際上對中間餾分油需求量不斷增大的趨勢,我們創造性的提出了以多產中間餾分油為目標的加氫熱裂化新方法。    2003.5.


本站收錄的本文作者的其他論文:

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

4、生物質廢棄物制氫技術

5、Enhancement effect of free radical initiator on hydro-thermal cracking of heavy oil and model compound

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