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Study on Coking of Residue with Recycling of Hydrogen Donor Distillate

Author: WuLiPing
Tutor: WangZongXian
School: China University of Petroleum
Course: Chemical Engineering and Technology
Keywords: Coking distillate Coke trends Colloidal stability Dynamic behavior Scorch
CLC: TE624.32
Type: Master's thesis
Year: 2011
Downloads: 23
Quote: 0
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Abstract

Tends to heavy oil resources of how to effectively process these low-grade heavy oil has become a challenging issue. Delayed coking process has a unique advantage in the processing of heavy oil, but the liquid yield, product distribution is still not ideal, delayed coking process, in order to optimize poor processability coking distillate take reasonable processing the thesis The for hydrogen distillate doped with residual oil to a certain percentage of the feasibility and advantages of Coker. First, through the investigation of the residuum and circulatory distillate hydrogen donor capacity and hydrogen abstraction ability, the presence of residual oil thermal cracking process hydrogen transfer reactions have a profound understanding of the structural parameters and found that the hydrogen transfer capacity and raw materials, H / C atomic ratio is closely related. Hydrogen supply capability with the extension of reaction time first increases to a peak and then decreases, hydrogen abstraction ability has been increased with time; the through of Karamay Residue and Venezuela Residue hydrogen transfer capacity of contrast, learned KLVR for hydrogen the ability than WVR stronger, but WVR hydrogen abstraction ability stronger than KLVR; reaction temperature, hydrogen donor ability, hydrogen abstraction capacity were increased to reach the time required for the maximum capacity of hydrogen; simultaneously find all segments of distillates hydrogen donor capacity of the order of: C gt; B gt; A; distillate C added to improve the residuum hydrogen transfer behavior, but added the amount of up to 0.3 (quality of distillate oil / residual oil quality). Continuous sampling devices discussed a residuum of coke trends and add distillate conductivity method combined system of colloidal stability autoclave. The research results show that the coke induction period, the slow rate of coke, coke after the induction period, the system quickly coke; elevated temperatures, coke induction period is shortened, and the higher the heating temperature, the raw coke after the induction period the faster the rate of coke; different residual oil coke trend is also very different, KLVR longer than WVR coke induction period; does not reach the starting point of the coke, the colloidal stability of the residual oil gradually declined over the coke starting point after colloidal stability stabilized; the distillate add the impact of residuum system coke induction period and colloidal stability trend distillate supply of hydrogen peak appeared consistent capacity for hydrogen late peak time and peak after the slow decline, to help extend the coke induction period, so that the colloidal stability flattens downward trend with the heating time. Finally, thermal gravimetric analysis of Karamay vacuum residuum the coking kinetic behavior made research and the the miniature laboratory simulation of industrial coking coking kettle investigated coking reaction process. By thermal gravimetric analysis the Karamay residuum its subfractions conversion rate - temperature curve has learned that saturates severe cracking temperature range of 350 ℃ to 480 ℃; the aromatics's severe coking temperature of 375 ℃ to 485 ℃ ; glial 382 ℃ to 498 ℃; the residuum dramatic coking temperature of 375 ° C to 492 ° C. Karamay Residue coking temperature of 500 ° C. The coke rate KLVR components from small to large order of saturates, aromatics, glial, asphaltenes. Residuum coke rate ranged between glial and aromatics. The coking experiments showed that the temperature increases the liquid yield to rise, gasoline, diesel yield increased, the reduced yield of coke and gas, but if the reaction temperature is too high, part of coker gasoline and diesel will cracking gas again to wait until the reaction temperature reached 500 ° C After the liquid yield will drop. Add distillate C, can significantly increase the liquid yield.

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CLC: > Industrial Technology > Oil and gas industry > Oil, natural gas processing industry > Petroleum refining > The refining process > Thermal conversion (cracking) > Scorch
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