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Fischer-Tropsch wax catalytic cracking for the production of low olefin and high octane number gasoline: Process optimization and heat effect calculation

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Petroleum Science 2023年第2期20卷 1255-1265页

作者： Mei Yang Gang Wang Jian-Nian Han Cheng-Di Gao Jin-Sen Gao State Key Laboratory of Heavy Oil Processing College of Chemical Engineering and and EnvironmentChina University of PetroleumBeijing 102249China College of Science China University of PetroleumBeijing 102249China

To produce low olefin gasoline with high octane number by Fischer-Tropsch (F-T) wax fluid catalytic cracking (FCC) process, operating conditions optimization were carried out in the pilot-scale riser and turbulent fluidized bed (TFB) FCC unit. The experimental results in the riser indicated that under the condition of low reaction temperature and regenerated catalyst temperature, large catalyst-to-oil weight ratio (C/O) and long reaction time, the gasoline olefin content could be reduced to 20.28 wt%, but there is large octane number loss owing to a great loss in high octane number olefin. Therefore, a novel FCC process using the TFB reactor was proposed to strengthen the aromatization reaction. The reaction performance of TFB reactor were investigated. The result demonstrated that the TFB reactor has more significant effect in reducing olefins and improving aromatics. At the expense of certain gasoline yield, the gasoline olefin content reduced to 23.70 wt%, aromatics content could increase to 26.79 wt% and the RON was up to 91.0. The comparison of reactor structure and fluidization demonstrated that the TFB reactor has higher catalyst bed density. The reaction heat and coke combustion heat was calculated indicating the feasibility of its industrial application of the TFB process.

关键词： Fischer-Tropsch wax Catalytic cracking Riser TFB Gasoline olefin reaction heat

Restraining effect of nitrogen on coal oxidation in different stages:Non-isothermal TG-DSC and EPR research

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International Journal of Mining Science and Technology 2020年第3期30卷 387-395页

作者： Tongyu Zhao Shengqiang Yang Xincheng Hu Wanxin Song Jiawen Cai Qin Xu State Key Laboratory of Coal Resources and Safety Mining China University of Mining and TechnologyXuzhou 221116China School of Safety Engineering China University of Mining and TechnologyXuzhou 221116China Key Laboratory of Gas and Fire Control for Coal Mines(China University of Mining and Technology) Ministry of EducationXuzhou 221116China Department of Civil&Environmental Engineering University of AlbertaEdmonton T6G 2W2Canada

Nitrogen is widely used to prevent the spontaneous combustion of coal in underground coal mines. A spontaneous combustion-prone coal seam was studied to investigate the restraining effect of nitrogen on coal oxidation in different oxidation stages, based on non-isothermal thermogravimetry-differential scanning calorimetry(TG-DSC) and electron paramagnetic resonance(EPR) experiments. We found that the key feature temperatures grow steadily with increasing nitrogen in the oxidation environment,resulting in longer oxidation stages. The most significant finding is that there is a stagnation of the inhibitory effect of nitrogen on coal oxidation in the range of 85.0–95.0% nitrogen in the slow and the rapid oxidation stages, owing to the competitive adsorption of coal by nitrogen and oxygen. However, the restraining effect cannot be reflected by the kinetic parameters of the coal before it reaches the thermal decomposition and combustion stage. Nitrogen can also affect free radical types and free radical concentrations during coal oxidation: the higher the concentration of nitrogen in the oxidation environment, the greater the number of free radical types and the lower the free radical concentration. This experimental study improves the understanding of the restraining effect of nitrogen on coal oxidation in different oxidation stages and provides an important reference for coal fire prevention in spontaneous combustionprone coal seams.

关键词： reaction heat Non-isothermal TG-DSC Activation energy Pre-exponential factor Free radical

A novel scalable synthesis process of PPTA by coupling n-pentane evaporation for polymerization heat removal

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Chinese Chemical Letters 2011年第11期22卷 1379-1382页

作者： Tao Zhang Guo Hua Luo Fei Wei Yan Yan Lu Wei Zhong Qian Xin Lin Tuo Department of Chemical Engineering Tsinghua University Beijing 100084 China

In this study,we compared the effect of n-pentane and ice-water bath on removing the thermal effect in the poly（p-phenylene terephthalamide）（PPTA） polymerization *** results indicate that the n-pentane can help to transfer the reaction heat faster and *** suitable amount of n-pentanes into the PPTA preparation process not only improve the heat transfer,but also reduce the motor power in the polymerization ***,the introduction of n-pentane properly does not result in decrease of the inherent viscosity（η_（inh）） of ***,it leads to increased viscosity of polymer during the PPTA preparation *** results indicate that n-pentane can effectively transfer the reaction heat and avoid overheating during the polymerization of PPTA.

关键词： PPTA n-Pentane Ice-water bath reaction heat

Energy analyses for the energetically self-sufficient supercritical water oxidation process

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Journal of Chemistry and Chemical Engineering 2008年第4期2卷 62-70页

作者： LIU Yan-yan ZHAN Shi-ping WANG Jing-chang ZHU Bo CHEN Shu-hua LIU Xue- wu Li Zhi-yi Research ＆ Design Institute of Fluid and Powder Dalian University of Technology Dalian 116012 China College of Environment ＆ Chemical Engineering Dalian University Dalian 116622 China

One of the bottle-neck problems to the commercial development of supercritlcal water oxidation （SCWO） is high operation cost. In this study the condition to realize an energetically self-sufficient SCWO process is analyzed. The reaction heat is recovered by means of Organic Rankine Circle. The process of SCWO for phenol is simulated with the Aspen Plus~ process simulator, and the results show that the influence of temperature on reaction heat is small at a constant pressure. It is reasonable to neglect the effect of temperature and to estimate the heat of reaction with average temperature when the temperature changes in a small range. The necessary condition to realize an energetically self-sufficient SCWO process is that the released energy is not less than consumed one. Whether a waste system with given chemical composition is energeticallyself-sufficient can be estimated by ^QR^QH 〉 W The thermodynamics analysis shows that energetically self-sufficient SCWO process with an Organic Rankine Cycle is a feasible technology for the recovery of SCWO reaction heat,and the energy balance point for phenol is 2wt%.

关键词： SCWO reaction heat organic Rankine circle energetic self-sufficiency