Showing papers by "Haifeng Dong published in 2011"
TL;DR: In this paper, ionic liquids (ILs) were used as potential solvents to extract asphaltenes from direct coal liquefaction residue (DCLR), and a series of dialkylphosphate ILs, i.e., imidazolium based, pyridinium-based, and ammonium based were synthesized and used to extract ASs from DCLR.
Abstract: Direct coal liquefaction residue (DCLR) contains about 25% asphaltenes which are proved to be important precursors for preparing high value-added carbon materials. In this work, ionic liquids (ILs) were used as potential solvents to extract asphaltenes from DCLR, and a series of dialkylphosphate ILs, i.e., imidazolium-based, pyridinium-based, and ammonium-based, were synthesized and used to extract asphaltenes from DCLR. The influences of extractive time, extractive temperature, and mass ratio of ILs to DCLR on extraction efficiency of asphaltenes were investigated and the optimized conditions were determined. In order to understand the mechanism of extraction asphaltenes with ILs, the extracts were characterized by elemental analysis, FT-IR, 13CNMR, and so on. The results show that it is feasible to extract asphaltenes from DCLR with dialkylphosphate ILs. The structure and size of anion and cation of ILs probably are the main factors that influence the extraction yield and the physicochemical characteris...
55 citations
TL;DR: In this paper, the authors presented a study to apply ionic liquids as potential industrial solvents for carbon dioxide capture, and the regeneration performance of the solvent was also investigated.
44 citations
TL;DR: In this paper, the solubilities of CO, H(2), N(2) and O(2 ) in a novel alcamines ionic liquid (IL) of 2-[2-hydroxyethyl (methyl) amino] ethanol chloride (MDEA][CI) were investigated at temperature ranging from 313.15 to 333.15K and pressure ranging from 1.22 to 8.62 MPa.
38 citations
Patent•
10 Aug 2011
TL;DR: In this article, a composite extractant prepared from ionic liquid, acetonitrile and water is used for separating the butadiene from other hydrocarbons in C4 fraction.
Abstract: The invention discloses a method for producing butadiene, and belongs to the technical field of olefin production. In order to solve uneconomical problems of high tower temperature, blockage of a tower plate due to butadiene polymerization, severe solvent loss and the like in the conventional process for extracting the butadiene through an acetonitrile method, the invention provides a new process for producing butadiene based on an ionic liquid complex solvent. By adopting technical means such as extractive distillation, common distillation and the like, a composite extractant prepared from ionic liquid, acetonitrile and water is used for separating the butadiene from other hydrocarbons in C4 fraction. Compared with the conventional acetonitrile process, the method has the advantages of obviously reducing process energy consumption, reducing butadiene polymerization, reducing consumption of acetonitrile, and improving the yield and purity of the butadiene; and the invention provides a scheme of recovering ionic liquid in industrial application, which can realize high recovery rate of the ionic liquid.
1 citations