摘要:
A process and apparatus are disclosed for the catalytic conversion of hydrocarbons in a transport or sub-transport fluidized bed reaction zone. Inert particles are used to transfer heat to the reaction zone. The particles may be heated separately from the catalyst in a combustion zone or together with the catalyst in a regenerator. Fuel is fired to heat the inert particles or a mixture of catalyst and inert particles. Hydrogen deficient fuels such as charcoal or coke are preferred.
摘要:
An integrated process for the production of ether-rich liquid fuels containing MTBE and TAME by etherifying a hydrocarbon feedstock containing C.sub.4 + isoalkenes in the presence of a high stoichiometric excess of lower alkyl alcohol. Unreacted alcohol and olefins are passed to a zeolite catalyzed conversion reactor under olefinic and oxygenates conversion condition whereby gasoline and light hydrocarbons are produced. The light hydrocarbon fraction comprising C.sub.4 -C.sub.5 paraffins is dehydrogenated and C.sub.4 -C.sub.5 olefins are recycled to the etherification reactor.
摘要:
A process is disclosed for converting a light hydrocarbon feedstock that contains a mixture of linear and branched olefins to ether-rich high octane gasoline streams that include tertiary alkyl and isoalkyl ethers such as MTBE, TAME, methyl isopropyl ether (MIPE), and methyl sec-butylether (MSBE). The conversion is achieved by utilizing the differing reactivity of tertiary olefins under selected conditions compared to linear olefins in the catalyzed etherification processes. The discovery has been made that unreacted olefins from the etherification reactions can be converted to gasoline boiling range hydrocarbons by contacting them with zeolite catalyst at elevated temperature. Further, it has been discovered that unreacted paraffins in the integrated process can be dehydrogenated to produce C.sub.3 -C.sub.4 olefins which can be recycled to the etherification process.
摘要:
A technique for converting olefinic light hydrocarbons to ether-rich liquid fuels and olefinic gasoline including etherification, olefin upgrading and transhydrogenation operations. The preferred process includes: reacting a fresh hydrocarbon stream containing C.sub.4 + iso-alkene with lower aliphatic alcohol in an etherification zone in contact with an acidic etherification catalyst under etherification conditions whereby an effluent stream containing C5+ tertiary-alkyl ether is produced; separating the etherification effluent stream to provide a first liquid stream comprising C5+ ether and a second stream comprising unreacted alcohol and C4+ hydrocarbons; contacting the second stream with acidic metallosilicate catalyst for conversion of oxygenates and olefins under olefin oligomerization and isomerization conditions at elevated temperature; separating oligomerization effluent to recover an intermediate hydrocarbon stream rich in C.sub.4 + paraffinic hydrocarbon, a light gas stream, and a liquid product stream comprising C.sub.6 + olefinic gasoline; contacting the C.sub.4 + intermediate hydrocarbon stream with lower alkene in the presence of transhydrogenation catalyst whereby C.sub.4 + paraffin is converted to C4+ olefin, including iso-alkene; separating transhydrogenation effluent to recover C4+ olefin containing iso-alkene; and passing at least a portion of iso-alkene to the etherification zone for co-conversion with fresh hydrocarbon and alcohol to produce tertiary-alkyl ether.
摘要:
A process and apparatus are disclosed for the production of gasoline from a C.sub.4.sup.- fuel gas containing ethene and propene and catalytic reformate containing C.sub.6 to C.sub.8 aromatics. The C.sub.4.sup.- fuel gas is contacted with debutanized catalytic reformate over a zeolite catalyst under process conditions to convert ethene and propene in the C.sub.4.sup.- fuel gas to C.sub.5.sup.+ aliphatic and aromatic hydrocarbon gasoline and to convert C.sub.6 to C.sub.8 aromatics in the reformate to C.sub.7 to C.sub.11 aromatic hydrocarbon gasoline. Reformer fractionation system containing debutanizer column and separator stabilizes effluent gasoline and recycles unconverted light aromatics.
摘要:
A turbulent super-dense fluid-bed of a medium pore zeolite metallosilicate catalyst is operated at low WHSV, outside a critical region in the phase diagram of the hydrocarbon mixture in the reactor, at or above conditions of pressure P.sub.max and temperature T.sub.max at which a liquid phase may not form. The result is oligomerization of a "light gas" predominantly C.sub.3 -C.sub.5 olefin feed, the remainder being mainly C.sub.3 -C.sub.5 lower alkanes. The oligomerized product is a "heavies" stream, namely, distillate and lube oil range hydrocarbons, with a minor proportion by weight of gasoline range hydrocarbons. The reactor may be operated in either a C.sub.1.sup.+ distillate mode, or, a C.sub.22.sup.+ lubes mode. The superdense fluid bed with a density, measured at the bottom of the reaction zone, greater than 500 kg/m.sup.3, and operates at a temperature in the range from about 204.degree. C. (400.degree. F.) to about 371.degree. C. (700.degree. F.), and a pressure in the range from about 2857 kPa (400 psig) to about 13880 kPa (2000 psig) or even higher. This unique process provides per pass conversion of olefins, and selectively to C.sub.5.sup.+ hydrocarbons, each in excess of 80%.
摘要:
Apparatus for converting crude aqueous oxygenate feedstock, such methanol or the like, to liquid hydrocarbons in contact with a medium pore shape selective crystalline acid zeolite catalyst, such as HZSM-5. In a preferred embodiment, the novel technique comprises means for: (a) contacting a crude methanol feedstock containing a minor amount of water with a liquid hydrocarbon extraction stream under extraction conditions favorable to selective extraction of the methanol, thereby providing an extract liquid stream rich in methanol and an aqueous raffinate stream lean in methanol; (b) charging the extracted methanol substantially free of water to said reaction zone under process conditions to convert substantially all methanol to hydrocarbons; (c) cooling reaction effluent to recover aqueous liquid byproduct stream, gas rich in C.sub.2.sup.- hydrocarbons, liquid rich in C.sub.3 -C.sub.4 hydrocarbons and C.sub.5.sup.+ liquid hydrocarbons; and (d) contacting crude methanol feedstock with at least a portion of the liquid hydrocarbons employed as extraction liquid.
摘要:
An integrated process for the production of aromatics rich an MTBE and TAME rich high octane gasoline fractions is described. Etherifications of iso-olefins is conducted in the presence of excess methanol. Unreacted methanol is passed to a fixed, fluid or moving bed aromatization zone in contact with ZSM-5 catalyst and olefin and paraffin feedstream to produce high octane gasoline.
摘要:
Improved product stripping in a catalytic hydrodesulfurization (CHD) product stream is obtained by employing off-gas from the unit as a stripping medium. The compressed off-gas is introduced into the stripper below the stripper feed level. The stripper may be operated at pressures higher than those previously employed in CHD product strippers and this permits LPG recovery to be maximized with lower product sulfur levels and reduced load in the off-gas compressor.
摘要:
A multi-stage catalytic olefin upgrading technique for converting lower olefinic feedstock to heavier liquid hydrocarbon product. The invention provides a fluid bed continuous primary stage reaction zone with shape selective medium pore zeolite oligomerization catalyst particles to convert at least a portion of the lower olefinic components to intermediate olefinic hydrocarbons containing olefinic and aromatic components; cooling primary stage reaction effluent to condense at least a portion of the intermediate hydrocarbons; feeding a second olefinic stream to a serially arranged multi-reactor secondary stage for upgrading lower olefins; quenching partially upgraded secondary stage olefins with primary stage liquid; and further contacting the quenched mixture including aromatics from the primary stage with shape selective medium pore zeolite olgiomerization catalyst in a high pressure fix bed secondary stage distillate mode catalytic reactor at elevated temperature and high prssure to provide a heavier hydrocarbon effluent stream comprising distillate hydrocarbons.