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glycerol carbonate synthesis from glycerol and dimethyl carbonate using guanidine ionic liquids

Chinese Journal of Chemical Engineering 2017年第9期25卷 1182-1186页

作者： Xingxing Wang Peng Zhang Penglei Cui Weiguo Cheng Suojiang Zhang Beijing Key Laboratory of Ionic Liquids Clean Process Key Laboratory of Green Process Engineering State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of Sciences University of Chinese Academy of Sciences

A large number of surplus glycerol from the biodiesel production can be used as renewable feedstock to produce glycerol carbonate. In this paper, a series of guanidine-based ionic liquids were synthesized to catalyze the transesterification of glycerol and dimethyl carbonate. The tunable basicity and the anion–cation cooperative effect were responsible for the obtained results. The [TMG][TFE] showed the best activity turnover frequency(TOF)of 1754.0 h^(-1), glycerol(GL) conversion of 91.8%, glycerol carbonate(GC) selectivity of 95.5%) at 80 °C with 0.1 mol% catalyst for 30 min. The reaction mechanism of the transesterification was also proposed.

关键词： Guanidine-based ionic liquids glycerol carbonate Transesterification

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Mechanism study on direct synthesis of glycerol carbonate from CO_(2)and glycerol over shaped CeO_(2)model catalysts

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Chinese Chemical Letters 2023年第12期34卷 348-353页

作者： Jiarui Gao Jia-Wei Yang Tenglin Ma Jia Wang Dan Xia Bin Du Yan Cui Chengwu Yang School of Space and Environment Beihang UniversityBeijing 100191China The Future Laboratory Tsinghua UniversityBeijing 100084China PetroChina Petrochemical Research Institute Beijing 100195China

Direct synthesis of glycerol carbonate(GC)from CO_(2)and glycerol(a byproduct of biodiesel production)is a route to obtain a high-value chemical from waste and low-cost byproducts but has not yet industrialized due to the lack of efficient ***(CeO_(2))exhibits the highest catalytic activity and GC selectivity among the heterogeneous catalysts studied so ***,the mechanism of this reaction over CeO_(2)catalysts has not been studied in ***,we synthesized CeO_(2)nanocrystals with different morphologies as model catalysts that can predominantly expose(111),(110),and(100)facets,and their surface acid-base properties were characterized using high-sensitivity temperature-programmed desorption of NH3 and CO_(2)with quadrupole mass spectrometry as detector(NH3-TPD-QMS and CO_(2)-TPD-QMS).We found that the catalytic performance(GC formation rate)is strictly linearly dependent on the density of basic sites,which is relevant to the adsorption and activation of CO_(2).In addition,to illustrate a more microscopic reaction mechanisms underlying the formation of GC from CO_(2)and glycerol on all three low-index surfaces(111),(110)and(100),we also performed comprehensive first principles calculations.A three-step Langmuir-Hinshelwood(LH)mechanism was identified in which the annulation reaction is the rate-limiting *** CeO_(2)(11)surface exhibits the lowest overall activation energy,which agrees well with the catalytic performance that the CeO_(2)nano-octahedra,predominantly exposing(111)facets,have the highest GC formation *** work is the first to combine experiments on shaped CeO_(2)model catalysts with first-principles calculations to gain insight into the mechanism of direct synthesis of GC from CO_(2)and glycerol,and will aid in the development of catalysts with improved performance.

关键词： CO_(2)conversion glycerol carbonate CeO_(2) Acid-base properties Reaction mechanism

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Economic Analysis of Biodiesel and glycerol carbonate Production Plant by glycerolysis

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Journal of Sustainable Bioenergy Systems 2013年第3期3卷 209-216页

作者： Nghi Nguyen Yasar Demirel Department of Chemical and Biomolecular Engineering University of Nebraska LincolnLincolnUSA

Techno-economic analysis of an indirect use of carbon dioxide within the route of glycerolysis of glycerol with urea is investigated. The results show that the net present value of the biodiesel-glycerol carbonate production by glycerolysis is higher than the biodiesel-glycerol carbonate production by direct carboxylationat at the end of the 12-year operation with similar capacities. The stochastic model has predicted that using glycerolysis route for the synthesis of glycerol carbonate production might increase the probability of getting positive net present value by about 15%.

关键词： Biodiesel Direct Carboxylation glycerolysis glycerol carbonate Economic Analysis

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