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The CO_2 absorption and desorption performance of the triethylenetetramine + N,N-diethylethanolamine + H_2O system

Chinese Journal of Chemical Engineering 2018年第11期26卷 2351-2360页

作者： Yaoyao Li Changjun Liu Richard Parnas Yingying Liu Bin Liang houfang lu School of Chemical Engineering Sichuan University Institute of New Energy and Low Carbon Technology Sichuan University Institute of Materials Science University of Connecticut

Post-combustion CO_2 capture(PCC) process faces significant challenge of high regeneration energy *** absorbent is a promising alternative candidate which could significantly reduce the regeneration energy consumption because only the CO_2-concentrated phase should be regenerated. In this work, aqueous solutions of triethylenetetramine(TETA) and N,N-diethylethanolamine(DEEA) are found to be efficient biphasic absorbents of CO_2. The effects of the solvent composition, total amine concentration, and temperature on the absorption behavior, as well as the effect of temperature on the desorption behavior of TETA–DEEA–H2 O system were investigated. An aqueous solution of 1 mol·L-1 TETA and 4 mol·L-1 DEEA spontaneously separates into two liquid phases after a certain amount of CO_2 is absorbed and it shows high CO_2 absorption/desorption *** 99.4% of the absorbed CO_2 is found in the lower phase, which corresponds to a CO_2 absorption capacity of 3.44 mol·kg-1. The appropriate absorption and desorption temperatures are found to be 30 °C and 90 °C,respectively. The thermal analysis indicates that the heat of absorption of the 1 mol·L-1 TETA and 4 mol·L-1 DEEA solution is-84.38 kJ·(mol CO_2)-1 which is 6.92 kJ·(mol CO_2)-1 less than that of aqueous MEA. The reaction heat, sensible heat, and the vaporization heat of the TETA–DEEA–H2 O system are lower than that of the aqueous MEA, while its CO_2 capacity is higher. Thus the TETA–DEEA–H2 O system is potentially a better absorbent for the post-combustion CO_2 capture process.

关键词： CO2 capture Post-combustion Amine mixtures Biphasic absorbent

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Production of glycerol carbonate using crude glycerol from biodiesel production with DBU as a catalyst

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Chinese Journal of Chemical Engineering 2018年第9期26卷 1912-1919页

作者： Ying Qing houfang lu Yingying Liu Changjun Liu Bin Liang Wei Jiang School of Chemical Engineering Sichuan University Institute of New Energy and Low Carbon Technology Sichuan University

The biodiesel production technology catalyzed by 1,8-diazabicycloundec-7-ene（DBU）is developed in this *** glycerol containing DBU and DBU/glycerol/CO2（DGC）ionic compounds reacts directly with dimethyl carbonate（DMC）to produce high value-added glycerol carbonate（GC）catalyzed by DBU and *** catalytic performance of DBU and DGC,as well as the kinetics of the reaction catalyzed by DBU,were *** results show that DGC has a weak catalytic effect on the transesterification of glycerol and *** the temperature is higher than 60℃,DGC catalyzes the reaction jointly with DBU,which is produced from the decomposition of *** has a good catalytic effect on the reaction between glycerol and DMC,with 90%conversion of glycerol and 84%selectivity to GC under the following conditions：DMC-to-glycerol molar ratio of 3：1,4.0%DBU（based on glycerol mass）,reaction time of 60 min,and reaction temperature of 40℃.The apparent kinetics results show that the activation energies are 30.95 kJ·mol^-1 and 55.16 kJ·mol^-1 for the forward and reverse GC generation reactions,respectively,and the activation energy of the decomposition reaction of GC to glycidol（GD）is 26.58 kJ·mol^-1.

关键词： Glycerol DBU Glycerol carbonate Apparent kinetics

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Jatropha curcas L. oil extracted by switchable solvent N, N-dimethylcyclohexylamine for biodiesel production

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Chinese Journal of Chemical Engineering 2016年第11期24卷 1640-1646页

作者： Shanjin Zeng Chuandong Tao Richard Parnas Wei Jiang Bin Liang Yingying Liu houfang lu College of Chemical Engineering Sichuan University Chengdu 610065 China Institute of New Energy and Low Carbon Technology Sichuan University Chengdu 610065 China Institute of Materials Science Univ. of Connecticut Storrs. CT06269-3136 USA

Biodiesel, which is a renewable and environmentally friendly fuel, has been studied widely to help remedy increasing environmental problems. One of the key processes of biodiesel production is oil extraction from oilseed materials. Switchable solvents can reversibly change from molecular to ionic solvents under atmospheric CO_2,and can be used for oil extraction. N, N-dimethylcyclohexylamine(DMCHA), a switchable solvent, was used to extract oil from Jatropha curcas L. oil seeds to produce biodiesel. The appropriate extraction conditions were:1:2 ratio of seed mass to DMCHA volume, 0.3–1 mm particle size, 200 r·min-1agitation speed, 60 min extraction time, and 30 °C extraction temperature. The extraction ratio was about 83%. This solvent extracted the oil more efficiently than hexane, and is much less volatile. By bubbling CO_2 under 1 atm and 25 °C for 5 h, the oil was separated, and DMCHA was recovered after releasing CO_2 by bubbling N_2 under 1 atm and 60 °C for 2 h. The residual solvent content in oil was about 1.7%. Selectivity of DMCHA was evaluated by detecting the protein and sugar content in oil. Using the oil with residual solvent to conduct transesterification process, the oil conversion ratio was approximately 99.5%.

关键词： Jatrapha curcus L. oil Extraction N N-dimethylcyclohexylamine Switchable hydrophilic solvent Biodiesel

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CO2 absorption performance in a rotating disk reactor using DBU-glycerol as solvent

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Chinese Journal of Chemical Engineering 2020年第1期28卷 104-113页

作者： Hualing Duan Kun Zhu houfang lu Changjun Liu Kejing Wu Yingying Liu Bin Liang School of Chemical Engineering Sichuan UniversityChengdu 610065China Institute of New Energy and Low Carbon Technology Sichuan UniversityChengdu 610065China

Gas–liquid mass transfer of rotating disk reactor was studied in CO2 absorption using 1,8-diazabicyclo-[5.4.0]-undec-7-ene(DBU)-glycerol solution as solvent. Effects of the rotating disk structure and various operation parameters on the CO2 absorption rate and CO2 removal efficiency were investigated. The rotating disk with optimal holes is conducive to mass transfer of CO2 and the formation of thin liquid film at the opening increases the gas–liquid contact area. With the increase of rotating speed, the liquid flow pattern on the rotating disk surface changes from thin film flow to separated streams and creates extra liquid lines attached to the rim of the disk,which leads to a very complicated change on the CO2 absorption rate and CO2 removal efficiency. The overall gas-phase mass transfer coefficient increases 138% as the rotating speed increasing from 250 to 1400 r·min^-*** temperature from 298 to 338 K can enhance the CO2 absorption rate due to lowering the viscosity of the solvent. The rate-determined step for the absorption is focused on the gas side. The rotating disk reactor can effectively enhance the absorption of CO2 with viscous DBU-glycerol solvents.

关键词： Gas–liquid flow Carbon dioxide Rotating disk reactor Absorption rate Viscosity

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Hydrolysis of mechanically pre-treated cellulose catalyzed by solid acid SO4^2--TiO2 in water–ethanol solvent

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Chinese Journal of Chemical Engineering 2020年第1期28卷 136-142页

作者： Xingyilong Zhang houfang lu Kejing Wu Yingying Liu Changjun Liu Yingming Zhu Bin Liang Institute of New Energy and Low-Carbon Technology Sichuan UniversityChengdu 610207China School of Chemical Engineering Sichuan UniversityChengdu 610065China

An efficient catalyst SO4^2--TiO2(ST) from industrial metatitanic acid has been successfully prepared to catalyze hydrolysis of ball-milling cellulose. The results show that the highest catalytic efficiency is obtained for ST calcined at 450 ℃(ST-450) with the yield of 21.8% glucose, 13.0% 5-HMF and 4.2% furfural at 200 ℃ for30 min. The ball milling of cellulose and solid acid catalyst significantly enhances the cellulose hydrolysis. The high Lewis to Bronsted acid sites ratio for ST-450 induced by bidentate ligands between SO4^2-and TiO2 benefits high organics yield, and high total acid sites contribute to the high cellulose conversion. The large pore volume of 0.29 cm^3·g^-1 and appropriate pore size of 7.35 nm of ST-450 also contribute to the high performance. High reaction temperature over 200 ℃ exhibits negative effect on glucose and 5-HMF yield due to undesired side reactions, while furfural product is stable in the reaction system. The bidentate ligands between SO4^2-and TiO2 are considered as active acid sites for cellulose hydrolysis in water–ethanol solvents.

关键词： Cellulose Industrial metatitanic acid Solid acid TiO2 Hydrolysis Ball milling

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DBU-based CO2 absorption-mineralization system: Reaction process,feasibility and process intensification

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Chinese Journal of Chemical Engineering 2020年第4期28卷 1145-1155页

作者： Cong luo Kejing Wu Hairong Yue Yingying Liu Yingming Zhu Wei Jiang houfang lu Bin Liang School of Chemical Engineering Sichuan UniversityChengdu 610065China Institute of New Energy and Low-carbon Technology Sichuan UniversityChengdu 610207China

Amine-based carbon dioxide(CO2)capture is still limited by high desorption energy *** CO2 into carbonate is a safer and more permanent *** this work,calcium oxide(CaO)is introduced to perform chemical desorption instead of thermal desorption on 1,8-diazabicyclo[5.4.0]undec-7-ene(DBU)aqueous solution after CO2 *** X-ray diffraction(XRD)patterns of solid products show the formation of calcite calcium carbonate(CaCO3),which prove the feasibility of this *** effects of reaction temperature,reaction time and Ca2+/CO32-molar ratios on the related reactions in CO2 absorption-mineralization process and CaCO3 precipitation are discussed,and purer CaCO3 is obtained by ultrasonic *** CaCO3 content can be increased to 95.8%and the CO2 desorption ratio can achieve 80%by 30 min ultrasonic dispersion treatment under the conditions(40℃,180 min,Ca2+/CO32-molar ratio=1.0).After five cycles,DBU aqueous solution shows stable CO2 absorption and mineralization *** transform infrared spectroscopy(FT-IR)spectra of the reaction process also indicate the regeneration of the *** with thermal desorption,this process is exothermic,almost without no additional heat.

关键词： CO2 mineralization CaCO3 1,8-Diazabicyclo[5.4.0]undec-7-ene aqueous Reaction process

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Ball milling promoted direct liquefaction of lignocellulosic biomass in supercritical ethanol

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Frontiers of Chemical Science and Engineering 2020年第4期14卷 605-613页

作者： Chunyan Yang Xiaoliang Yuan Xueting Wang Kejing Wu Yingying Liu Changjun Liu houfang lu Bin Liang School of Chemical Engineering Sichuan UniversityChengdu 610065China Institute of New Energy and Low-Carbon Technology Sichuan UniversityChengdu 610207China

In the present work,ball milling was applied for the pretreatment of lignocellulose to obtain high conversion and bio-oil yield in supercritical *** milling substantially decreased the crystallinity and particle size of lignocellulose,thereby improving its accessibility in ethanol *** increased bio-oil yield of 59.2%was obtained for the ball milled camphor-wood sawdust at 300℃,compared with 39.6%for the original *** crystallinity signifi-cantly benefited the conversion of the cellulose component from 60.8%to 91.7%,and decreased particle size was beneficial for the conversion of all *** obtained bio-oil had a high phenolic content,as analyzed by gas chromatography-mass *** and retro-aldol condensation were observed during alcoholysis,and the reaction pathways of lignocellulose in supercritical ethanol were attributed to the action of free radicals.

关键词： ball milling lignocellulose superitial etha-nol liquefaction bio-oil

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A green route for hydrogen production from alkaline thermal treatment(ATT)of biomass with carbon storage

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Carbon Resources Conversion 2023年第4期6卷 298-314页

作者： Guojie Liu Zexue Du houfang lu Jianli Zeng Kejing Wu Bin Liang School of Chemical Engineering Sichuan UniversityChengdu 610065China Engineering Research Center of Alternative Energy Materials&Devices Ministry of EducationSichuan UniversityChengdu 610065China State Key Laboratory of Catalytic Materials and Reaction Engineering Research Institute of Petroleum ProcessingSINOPECBeijing 100083China Institute of New Energy and Low-Carbon Technology Sichuan UniversityChengdu 610207China

Hydrogen,a green energy carrier,is one of the most promising energy ***,it is currently mainly produced from depleting fossil fuels with high carbon emissions,which has serious negative effects on the economy and *** address this issue,sustainable hydrogen production from bio-energy with carbon capture and storage(HyBECCS)is an ideal technology to reduce global carbon emissions while meeting energy *** review presents an overview of the latest progress in alkaline thermal treatment(ATT)of biomass for hydrogen production with carbon storage,especially focusing on the technical characteristics and related challenges from an industrial application ***,the roles of alkali and catalyst in the ATT process are critically discussed,and several aspects that have great influences on the ATT process,such as biomass types,reaction parameters,and reactors,are ***,the potential solutions to the general challenges and obstacles to the future industrial-scale application of ATT of biomass for hydrogen production are proposed.

关键词： Hydrogen BECCS Negative carbon emission Alkaline thermal treatment(ATT) Biomass

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Lipid extraction and CO_(2)capture with switchable polarity solvent

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Carbon Resources Conversion 2024年第1期7卷 32-38页

作者： Kejing Wu Chuandong Tao Shanjin Zeng Yingying Liu Bin Liang houfang lu Institute of New Energy and Low-Carbon Technology Sichuan UniversityChengdu610207China School of Chemical Engineering Sichuan UniversityChengdu610065China

In this study,lipid extraction and CO_(2)capture are combined using N,N-dimethylcyclohexylamine(DMCHA)as switchable polarity *** effects of operation parameters are discussed according to the CO_(2)absorption/desorption and lipid/DMCHA recovery results.A triphasic models considering lipid,water,and gas phases are established to analyze the kinetic *** results show that DMCHA is reversible through CO_(2)absorption/desorption,and the enhanced dispersion of droplets and bubbles in water phase improves the lipid/DMCHA recovery and CO_(2)absorption/*** triphasic kinetic models fit well with experimental data,and gas-liquid mass transfer is regarded as the rate-determining *** lower interfacial areas result in the poorer gas-liquid mass transfer for the DMCHA recovery than lipid recovery process.

关键词： Switchable polarity solvent N,N-dimethylcyclohexylamine Lipid extraction CO_(2)capture Kinetic models

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The quasi-activity coefficients of non-electrolytes in aqueous solution with organic ions and its application on the phase splitting behaviors prediction for CO_(2) absorption

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Chinese Journal of Chemical Engineering 2022年第3期35卷 316-323页

作者： Xiaomeng Zhao Xingyu Li Changjun Liu Shan Zhong houfang lu Hairong Yue Kui Ma Lei Song Siyang Tang Bin Liang Laboratory of Low-Carbon Technology and Chemical Reaction Engineering School of Chemical EngineeringSichuan UniversityChengdu 610065China Institute of New Energy and Low-Carbon Technology Sichuan UniversityChengdu 610207China

CO_(2)capture with a low energy consumption is of important application significance for reducing CO_(2)*** phase-change absorbent developed in recent years shows its potential for low-energy CO_(2)*** unclear phase-splitting rule hinders the efficient development of CO_(2)phase-change *** predict phase-splitting behaviors of mono/poly-amine-organic solvent-water system with various concentrations,a quasi-activity coefficient was developed based on Debye&Mc Aulay equation and some Density function theory *** models based on Debye&Mc Aulay equation were developed with different ion radius,descriptors or poly-amine-CO_(2)*** phase-splitting boundary was drawn on the model with the best *** quasi-activity coefficient would provide guidance for the phase-splitting systems development,especially for polyamines.

关键词： CO_(2)absorption Polyamines Biphasic system Phase-splitting Salting-out effect

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