Abstract:
Provided in one embodiment is a continuous process for converting waste plastic into recycle for polyethylene polymerization. The process comprises selecting waste plastics containing polyethylene and/or polypropylene, and passing the waste plastics through a pyrolysis reactor to thermally crack at least a portion of the polyolefin waste and produce a pyrolyzed effluent. The pyrolyzed effluent is separated into offgas, a pyrolysis oil and optionally wax comprising a naphtha/diesel and heavy fraction, and char. The pyrolysis oil is passed to a refinery FCC unit from which a liquid petroleum gas C 3 olefin/paraffin mixture fraction is recovered, as well as a C 4 olefin/paraffin mixture fraction. In one embodiment, the pyrolysis oil is first passed to a FCC feed pretreater. The liquid petroleum gas C 3 olefin/paraffin mixture fraction is passed to a steam cracker for ethylene production. The C 4 olefin/paraffin mixture fraction is passed to a refinery alkylation unit, from which a n-butane and naphtha feed for a stream cracker to produce ethylene is recovered.
Abstract:
L'invention concerne un dispositif pour l'écoulement descendant d'un liquide hydrocarboné contenant des particules solides en fond d'un équipement (1) comprenant une partie supérieure cylindrique (11) de diamètre D1, une partie inférieure tronconique (12) d'angle d'inclinaison α compris entre 5° et 85°par rapport à l'axe vertical (z) de ladite partie supérieure cylindrique, une conduite de sortie (9) de diamètre D2, caractérisé en ce qu'il comprend au moins une injection (5) de liquide recyclé et/ou d'appoint dans la partie tronconique (12) de l'équipement (1) ; au moins une injection (6) de liquide recyclé et/ou d'appoint dans la partie cylindrique (11) de l'équipement (1) ; la ou lesdites injections (5) situées dans ladite partie tronconique étant inclinées par rapport à la paroi de la partie inférieure tronconique d'un angle β1 dans le plan vertical (xz) et d'un angle β2 dans le plan horizontal (xy); la ou lesdites injections (6) situées dans ladite partie cylindrique étant inclinées par rapport à la paroi de la partie supérieure cylindrique d'un angle θ1 dans le plan vertical (xz) et d'un angle θ2 dans le plan horizontal (xy), les angles β1 et θ1 étant compris entre 5° et 175°, les angles β2 et θ2 étant compris entre 90° et 270°. L'invention concerne également un procédé de conversion de charges hydrocarbonées mettant en oeuvre ledit dispositif.
Abstract:
A method for purification of ethylene-containing feed streams from steam crackers or fluid catalytic crackers (FCC), wherein the feed streams further comprises hydrogen, carbon monoxide, acetylenes, oxygen, nitrogen oxides, is disclosed. The method comprises contacting an ethylene-comprising gas stream with a Ru-based catalyst at reaction temperatures of at least 120°C. The process results in an ethylene- containing feed stream wherein the ethylene is essentially free of acetylenes, nitrogen oxides and oxygen. The purifying of the feed stream occurs with minimal loss of ethylene.
Abstract:
This invention relates to a process for the selective conversion of vacuum gas oil. The vacuum gas oil is treated in a two step process. The first is thermal conversion and the second is catalytic cracking of the products of thermal conversion. The product slate can be varied by changing the conditions in the thermal and catalytic cracking steps as well as by changing the catalyst in the cracking step. The combined products from thermal and catalytic cracking are separated in a divided wall fractionator.
Abstract:
A process for steam cracking a hydrocarbon feedstock containing olefins to provide increased light olefins in the steam cracked effluent, the process comprising passing a first hydrocarbon feedstock containing one or more olefines through a reactor containing a crystalline silicate to produce an intermediate effluent with an olefin content of lower molecular weight than that of the feedstock, fractionating the intermediate effluent to provide a lower carbon fraction and a higher carbon fraction, and passing the higher carbon fraction, as a second hydrocarbon feedstock, through a steam cracker to produce a steam cracked effluent. There is also provided a process for steam cracking a hydrocarbon feedstock containing olefins to provide increased light olefins in the steam cracked effluent, the process comprising passing a first hydrocarbon feedstock containing one or more olefins, which comprises at least one of a hydrotreated raw C 4 feedstock, LCCS, a raffinate 2 feedstock, a raffinate 1 feedstock, a raffinate 2 feedstock from a methyl tert-butyl ether (MTBE) or an ethyl tert-butyl ether (ETBE) unit, a raffinate from an olefins metathesis unit, in particular for the production of propylene from ethylene and butene, or a hydrotreated olefin-containing stream from an FCC unit, a visbreaker or a delayed coker, through a reactor containing a crystalline silicate to produce an intermediate effluent with an olefin content of lower molecular weight than that of the feedstock, and passing the intermediate effluent as a second hydrocarbon feedstock through a steam cracker to produce a steam cracked effluent. There is further provided a process for steam cracking a hydrocarbon feedstock containing olefins to provide increased light olefins in the steam cracked effluent, the process comprising steam cracking a first hydrocarbon feedstock comprising a paraffin-containing hydrocarbon feedstock and steam cracking a second hydrocarbon feedstock which contains C 4 and higher hydrocarbons, the second hydrocarbon feedstock containing one or more olefins and comprising a bottom fraction of an intermediate effluent produced by catalytic cracking of a third hydrocarbon feedstock in a reactor containing a crystalline silicate to produce the intermediate effluent having an olefin content of lower molecular weight than that of the third feedstock, and combining the two steam-cracked effluents to provide a common effluent.
Abstract:
A residuum feedstock is upgraded in a short vapor contact time thermal process unit (11) comprised of a horizontal moving bed of fluidized hot particles and is then fed to a fluid catalytic cracking reactor (17). Hot flue gases from the fluid catalytic cracking regenerator (27) are used to circulate solid particles and to provide process heat to the thermal process unit (11).
Abstract:
Es werden ein Verfahren und eine Vorrichtung zur Olefinherstellung beschrieben, wobei ein kohlenwasserstoffhaltiger Einsatz, z.B. Naphtha, in einer Behandlungsanlage (1), insbesondere einer Raffinerie oder Olefinanlage, in gewünschte Olefine, z.B. Ethylen und Propylen, umgesetzt wird. Dabei wird zumindest ein Teil der in der Behandlungsanlage (1) anfallenden Fraktionen, die längerkettige, insbesondere mindestens vier Kohlenstoffatome aufweisende, Olefine enthalten, einer Olefinkonversionsstufe (12) zugeführt. In der Olefinkonversionsstufe (12) wird zumindest ein Teil der längerkettigen Olefine in kürzerkettige Olefine umgesetzt. Als Olefinkonversionsstufe kann beispielsweise ein katalytischer Reaktor, insbesondere ein Festbettreaktor, eingesetzt werden. Um die Ausbeute an den gewünschten Olefinen zu erhöhen, wird vorgeschlagen, der Olefinkonversionsstufe (12) eine Paraffin-Olefin-Trennstufe (23) vorzuschalten. In dieser Paraffin-Olefin-Trennstufe (23) wird insbesondere durch Extraktivdestillation eine Auftrennung in Paraffine, z. B. Butan und Pentan, sowie Olefine, z. B. Buten und Penten, durchgeführt. Während die so gewonnenen Paraffine zur Behandlungsanlage (1), z. B. zum Spaltofen (3) der Olefinanlage, zurückgeführt werden, werden die Olefine zur Olefinkonversionsstufe (12) geführt.