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Language: English

Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received August 1, 2021
Accepted November 22, 2021

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Effect of slurry phase catalyst and H2 pressure on hydrocracking of SDA (solvent de-asphalting) pitch

Duy Van Pham^{1 2} Ngoc Thuy Nguyen^{1 3} Ki Hyuk Kang^{1 3} Pill Won Seo^{1 3} Gyoo Tae Kim^{1 3} Yong-Ki Park^{1 2} Sunyoung Park^{1 3†}

¹Petrochemical Catalyst Research Center, Korea Research Institute of Chemical Technology (KRICT), Daejeon 34114, Korea ²School of KRICT, University of Science and Technology (UST), Daejeon 34113, Korea ³, Korea

spark517@krict.re.kr

Korean Journal of Chemical Engineering, May 2022, 39(5), 1215-1226(12)
https://doi.org/10.1007/s11814-021-1026-7

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Abstract

Hydrocracking of solvent deasphalted (SDA) pitch was performed in batch and semi-batch systems, at different reaction temperatures (380-430 ℃) with varying amounts of Mo-octoate precursor (0-1,000 ppm Mo) under 70-130 bar of H2 pressure. The reusability of the catalyst was also examined. Coke formation was unavoidable in the hydrocracking of the asphaltene-rich feed. The coke induction period was prolonged when the catalyst was introduced. Increasing the Mo catalyst concentration decreased the coke yield and improved the product quality. The catalytic hydrocracking of the SDA pitch under high H2 pressure suppressed coke formation, promoted desulfurization, and increased the H/C ratio of the liquid products. At least 500 ppm of Mo catalyst and H2 pressur above 110 bar were required for the hydrocracking of SDA pitch with controllable coke generation in the semi-batch system. Sufficient hydrogen supply and moderate catalyst concentration were essential for the slurry-phase hydrocracking of asphaltenerich feedstocks to enhance the product quality and suppress coke formation.

Keywords

Slurry-phase Hydrocracking SDA Pitch Asphaltenes Coke Reaction Conditions

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