Abstract: There are provided an ionic liquid having ether group(s) in which a copper(I) compound is included, a method for preparing the same, and a method for removing traces amounts of acetylene-based hydrocarbon compounds included in olefin by absorption or extraction using the same. When the disclosed solution is used, oxidation of Cu(I) to Cu(II) is prevented since CuX is stabilized by the ionic liquid. Thus, selective removal efficiency of acetylenic compounds is improved greatly while the removal performance is retained for a long period of time. Further, since the solution according to the present disclosure is applicable as an extractant as well as an absorbent, the associated operation is simple and apparatus cost can be decreased.

Abstract: The present invention relates to a method of purifying olefin, the method comprising removing a small amount of acetylenic compounds contained in olefin by using pyrrolidinium-based or piperidinium-based ionic liquid mixtures comprising copper (I) halide. According to the method of the present invention, copper (I) halide is stabilized by pyrrolidinium-based or piperidinium-based ionic liquids, suppressing the oxidation of Cu(I) into Cu(II), whereby the capacity of removing acetylenic compounds can be maintained for a long time and the selective removal rate of acetylenic compounds to olefin can be significantly improved. In addition, since the ionic liquid mixtures comprising copper (I) halide used in the method of the present invention can be applied to both absorption and extraction processes, it can effectively remove acetylenic compounds from olefin in a more simple and economical way compared to the existing adsorption and membrane separation processes.

Abstract: A pressure swing adsorption process to separate para-xylene and ethylbenzene from C8 aromatics which uses a para-selective, non-acidic, medium pore molecular sieve of the MFI structure type and is operated isothermally in the vapor phase at elevated temperatures and pressures is integrated with crystallization to produce para-xylene product. A fixed bed of adsorbent is saturated with pX and EB, which are preferentially adsorbed, the feed is stopped, and lowering the partial pressure desorbs the pX and EB. The process effluent, which is rich in pX and EB, is crystallized to obtain para-xylene product.

Abstract: Alkenes, alkynes or mixtures thereof are removed from feedstreams by a process which comprises contacting the feedstream with a solution of a cuprous fluorinated acetylacetone in an organic solvent containing stabilizing agent to remove alkene, alkyne or mixture thereof by forming a first cuprous complex, decomposing the first cuprous complex whereby stabilizing agent replaces alkene or alkyne in the first cuprous complex to form a second cuprous complex, and separating the displaced component. The formation of the second cuprous complex avoids any deposition of copper metal upon heating.

Abstract: Conjugated diolefins contaminated with relatively high levels of acetylenic impurities in a hydrocarbon feedstream are purified by a cyclic, liquid phase, predominantly catalytic cracking process which selectively removes alpha-acetylenes in a single pass. The energy requirement for removing the alpha-acetylenes in this liquid phase process are from about one-third to about one-fifth as great as that required in a comparable vapor phase process. A feedstream containing about equal weights of butadiene and mixed monoolefins and alkanes contaminated with alpha-acetylenes including vinyl acetylene and methyl acetylene, inter alia, in an amount up to about 1.0 percent by weight (% by wt) of the feedstream, is contacted in the liquid phase with a supported Group I B metal oxide catalyst in the absence of hydrogen, at a temperature in the range from about 200.degree. F. to about 260.degree. F.