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Shape selective catalysis in methylation of toluene： Development, challenges and perspectives

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Frontiers of Chemical Science and Engineering 2018年第1期12卷 103-112页

作者： Jian Zhou Zhicheng Liu Yangdong Wang Dejin Kong Zaiku Xie Shanghai Research Institute of Petrochemical Technology S/NOPEC Shanghai 201208 China sinopec Beijing 100027 China

Toluene methylation with methanol offers an alternative method to produce p-xylene by gathering methyl group directly from C1 chemical sources. It supplies a ＂molecular engineering＂ process to realize directional conversion of toluene/methanol molecules by selective catalysis in complicated methylation system. In this review, we introduce the synthesis method ofp-xylene, the development history of methylation catalysts and reaction mechanism, and the effect of reaction condition in para-selective technical process. If constructing p-xylene as the single target product, the major challenge to develop para-selective toluene methylation is to improve the p-xylene selectivity without, or as little as possible, losing the fraction of methanol for methylation. To reach higher yield ofp-xylene and more methanol usage in methylation, zeolite catalyst design should consider improving mass transfer and afterwards coveting external acid sites by surface modification to get short ＂micro-tunnels＂ with shape selectivity. A solid understanding of mass transfer will benefit realizing the aim of converting more methanol feedstock into para-methyl group.

关键词： shape selective catalysis methylation of toluene

40Ar-39Ar Geochronology and Tectonic Implications of the Blueschist from Northwestern Qiangtang, Northern Tibet, Western China

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Acta Geologica Sinica(English Edition) 2012年第6期86卷 1471-1478页

作者： TANG Xianchun ZHANG Kaijun Guangzhou Institute of Geochemistry Chinese Academy of Sciences Graduate University of Chinese Academy of Sciences Research Institute of Petroleum Exploration and Development East China CompanySINOPEC Asian Tectonics Research group Department of Earth SciencesNanjing University

Blueschist exposed in the northwestern Qiangtang terrane, northern Tibet, western China （84 30＇ E, 34024＇ N）, provides new constraints on the tectonic evolution of Qiangtang as well as northern Tibet. The blueschist represented by lawsonite- and glaucophane-bearing assemblages equilibrated at 375-400 C and 11 kbar. 4Ar-39Ar analysis on mineral separate from one blueschist sample yielded a well-defined plateau age of 242 Ma. Geochemical studies show the blueschist is metamorphosed within-plate basalts. The high pressure-low temperature blueschist indicates a Triassic event of lithosphere subduction, and clearly represents an extension of the central Qiangtang metamorphic belt, and defines an in situ suture between eastern and western Qiangtang.

关键词： blueschist high-pressure metamorphism 40Ar-39Ar geochronology Qiangtang Tibet

Acoustic emission detection of slag performance in coal gasifiers

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Chinese Journal of Chemical Engineering 2020年第8期28卷 2200-2207页

作者： Zhengliang Huang Peng Zhang Yao Yang Jingyuan Sun JingdaiWang Yongrong Yang Chenghao Huang Zhixiong Huang College of Chemical and Biological Engineering Zhejiang UniversityZhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture TechnologyHangzhou 310027China State Key Laboratory of Chemical Engineering Hangzhou 310027China sinopec group Anqing BranchAnqing 246000China

This work first investigated the detection of slags,slag pool liquid level,and slag accumulation height in laboratory scale based on acoustic emission(AE)detection,and further tried the feasibility of this method in an industrial scale coal *** show that the energy and variance of acoustic signals can realize the accurate detection of large slag(criterion:E>1.5 E0,S>1.2 S0),and the average relative error is only 0.28%.The acoustic energy in the frequency range of 20–40 k Hz is defined as the characteristic energy,which can realize the accurate detection of slag accumulation height and slag pool liquid level,and the average relative error is only 3.94%.Furthermore,AE detection also realize accurate detection of large slag in an industrial scale gasifier and the acoustic signals at slag screen can be used to realize the early warning of the slag collapse(5 h earlier).

关键词： Acoustic emission(AE)detection Slag pool liquid level Slag accumulation height Early warning

Effects of time lag and stress loading rate on permeability in low permeability reservoirs

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Mining Science and Technology 2009年第4期19卷 526-530页

作者： WANG Rui YUE Xiang-an ZHANG Wei TAN Xi-qun ZHANG Yan MOE Key Laboratory for Petroleum Engineering China University of Petroleum Beijing 102249 China sinopec Exploration ＆ Production Research Institute Beijing 100083 China China Huayou group Corporation Beijing 100011 China

In order to study the effect of time lag and stress loading rates on rock deformation,the conventional stepped stress loading mode was changed into a continuous mode to investigate the effect of effective pressure on permeability and *** time lag effect of rock deformation illustrating the relationship between changes in permeability and steady time was *** reduction ratios were measured under different stress loading rates which were achieved by different pump rate *** results show that permeability and porosity gradually decrease with increases in effective *** at high effective pressure attains stability *** times at low effective pressure are very *** in permeability at lower stress loading rates is small,while,in contrast,it is large at high stress loading rates.

关键词： low permeability stress sensitivity time lag effect stress loading rate

Kinetic Model of LCO Selective Hydrogenation on NiMoW/Al_(2)O_(3) Catalyst

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China Petroleum Processing & Petrochemical Technology 2022年第3期24卷 1-9页

作者： Ju Xueyan Zhang Kui Xi Yuanbing Wang Zhe Nie Hong sinopec Research Institute of Petroleum Processing Co. Ltd.Beijing 100083

In order to investigate the hydrofining process of LCO for producing aromatics and gasoline,the selective hydrogenation of polycyclic aromatic hydrocarbons(PAHs),a major component of light cycle oil(LCO),was studied using a NiMoW/Al_(2)O_(3)*** on the study of the reversible hydrogenation reaction,PAHs in the selective hydrogenation process could be effectively simulated by the modeled CH and CH_(2) groups,and the hydrodesulfurization and hydrodenitrogenation kinetic models could be further established in this *** results showed that the kinetic models developed could fit the experimental data effectively and predict the content of S,N,and aromatics in the selective hydrogenation products of LCO.

关键词： LCO selective hydrogenation PAHs kinetic model CH group

One-pot Synthesis of 6-Hydroxyhexanoic Acid from Cyclohexanone Catalyzed by Dealuminated HBEA Zeolite with Aqueous 30% H_2O_2 Solution

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China Petroleum Processing & Petrochemical Technology 2018年第3期20卷 1-6页

作者： Xia Changjiu Yang Yongjia Zhao Yi Lin Min Zhu Bin Peng Xinxin Dai Zhenyu Luo Yibin Shu Xingtian State Key Laboratory of Catalytic Materials and Reaction Engineering Research Institute of Petroleum Processing SINOPEC

The one-pot synthesis of 6-hydroxyhexanoic acid from cyclohexanone via the integrated Baeyer-Villiger oxida-tion and ring opening reaction catalyzed by dealuminated HBEA zeolite has been developed. Under optimized conditions,the cyclohexanone conversion and 6-hydroxyhexanoic acid selectivity are over 95%, respectively. The excellent catalyticperformance is attributed to the activation of carbonyl group of cyclohexanone and the fast hydrolysis and ring opening ofs-caprolactone by both Lewis acid and Br0nsted acid sites under aqueous conditions.

关键词： Baeyer-Villiger oxidation cyclohexaxlone 6-hydroxyhexanoic acid zeolite hydrolysis

Environmentally-Friendly Catalytic Oxidation of Cyclohexanone with 30% H_2O_2 Solution: A Comparison Study between Hollow Titanium Silicate and Dealuminated HBEA Zeolites

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China Petroleum Processing & Petrochemical Technology 2018年第4期20卷 8-19页

作者： Xia Changjiu Zhao Yi Zhu Bin Lin Min Peng Xinxin Dai Zhenyu Shu Xingtian State Key Laboratory of Catalytic Materials and Reaction Engineering Research Institute of Petroleum Processing SINOPEC

Two clean liquid–phase cyclohexanone oxidation routes catalyzed by DHBEA and HTS zeolites, in the absence of organic solvents, have been developed for producing high value-added chemical intermediates. Under optimized conditions,the cyclohexanone conversion reaches up to 60%, and the selectivity of total target products(ε-caprolactone, 6-hydroxyhexanoic acid and adipic acid) is over 90% achieved by the HTS zeolite; while both cyclohexanone conversion and the 6-hydroxyhexanoic acid selectivity are over 95% obtained on the DHBEA zeolite. Both the Lewis and Br鰊sted acid sites of DHBEA zeolite can preferentially activate the carbonyl group of cyclohexanone without any impact on H_2O_2 ***, the HTS zeolite can predominantly make H_2O_2 more reactive, which agrees well with the molecular calculation results. Hence, two different Baeyer-Villiger oxidation mechanisms based on the activation of H_2O_2 and cyclohexanone are proposed. Then, 6-hydroxyhexanoic acid is formed via the ring-opening of ε-caprolactone. However, C-OH groups cannot be reactivated by DHBEA zeolite, leading to insignificant adipic acid formation, while the selectivity of adipic acid is 28.5% obtained on the HTS zeolite. Consequently, the higher catalytic performance of the DHBEA zeolite is ascribed to its larger amount of active sites and greater diffusion features than those of HTS zeolite.

关键词： hollow titanium silicate cyclohexanone oxidation zeolite Baeyer-Villiger molecular calculation

Deactivation Behavior of Hollow Titanium Silicalite Zeolite in Aqueous Ammonia Solution under Simulated Industrial Cyclohexanone Ammoximation Conditions

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China Petroleum Processing & Petrochemical Technology 2016年第4期18卷 1-10页

作者： Xia Changjiu Lin Min Peng Xinxin Zhu Bin Xu Guangtong Shu Xingtian State Key Laboratory of Catalytic Materials and Reaction Engineering Research Institute of Petroleum ProcessingSINOPEC

For simulating the real deactivation of hollow titanium silicalite(HTS) zeolite in commercial ammoximation process, HTS was treated by 10% NH_3·H_2O solution at 120 ℃ in stirred autoclave. It is found that a part of HTS zeolite crystals dissolved in the hot NH_3·H_2O solution, and the specific surface area and pore volume continuously decreased with the increase in NH_3 hydrothermal treatment time. Meanwhile, the transformation of framework Ti species into extraframework Ti species was detected by the spectroscopic methods. However, the extraframework Ti species were still in a highly dispersed state after the hydrothermal and thermal treatments as shown by TEM images, while the formation of new acid sites was not detected. Upon combining the results of characterization with catalytic performance of HTS, the main deactivation reason for this material had been determined, which might be attributed to the reduction of specific surface area and active centers after basic treatment and calcination of HTS samples. And then the possible mechanism of simulated deactivation of HTS zeolite was proposed, which could describe the elemental reaction steps much more visually and directly.

关键词： deactivation hollow titanium silicate ammoximation extraframework Ti TEM

Special issue: Operations analytics and optimization for manufacturing, logistics and energy systems

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Frontiers of Engineering Management 2017年第3期4卷 239-241页

作者： Jiming WANG Jie LIU Anlin SHAO Lixin TANG China Petrochemical Corporation SINOPEC Shanghai University ANSTEEL group Northeastern University

Practical manufacturing,logistics and energy systems are confronted with the problems of high energy consumption,tremendous production and logistics costs,and excessive resource *** meet

关键词： Operations analytics and optimization for manufacturing Special issue logistics and energy systems CPS