摘要:
Methods and apparatuses for recovering normal hexane from a reformate stream are provided. In one example, a method for recovering normal hexane from a reformate stream includes extracting aromatics from the reformate stream to form an aromatic extract stream and a raffinate stream. In the method, the normal hexane is separated from the raffinate stream to form a normal hexane product stream.
摘要:
An exemplary embodiment can be a process for removing one or more polynuclear aromatics from at least one reformate stream from a reforming zone. The PNAs may be removed using an adsorption zone. The adsorption zone can include first and second vessels each vessel containing an activated carbon adsorbent. Generally, the process includes passing the at least a portion of an effluent of the reforming zone through the first vessel containing a first activated carbon adsorbent wherein the first activated carbon adsorbent comprises iron.
摘要:
A simulated moving bed adsorptive separation process for preparing the separate feed streams charged to naphtha reforming unit and a steam cracking unit has been developed. The feed stream to the overall unit is passed into the adsorptive separation unit. The desorbent in the adsorptive separation is C12 hydrocarbons. The simulated moving bed adsorptive separation separates the components of the feed stream into a normal paraffin stream, which is charged to the steam cracking process, and non-normal hydrocarbons which are passed into a reforming zone. The desorbent is readily separated from the normal paraffin stream and from the non-normal paraffin stream and the simulated moving bed adsorption zone is operated at an A/Fn ratio of from about 0.90 to about 0.92.
摘要:
A hydrocarbon feedstock is catalytically reformed to effect dehydrocyclization of paraffins in a process combination comprising a first reforming zone containing a mixed reforming catalyst and sulfur sorbent and a sulfur-removal zone utilizing a manganese component to preclude sulfur from the feed to a second reforming zone. The process combination shows substantial benefits over prior art processes in achieving reforming-catalyst stability.
摘要:
A hydrocarbon feedstock is catalytically reformed to effect dehydrocyclization of paraffins in a process combination comprising a first reforming zone and a sulfur-removal zone utilizing a manganese component to preclude sulfur from the feed to a second reforming zone. The process combination shows substantial benefits over prior art processes in the stability of the extremely sulfur-sensitive catalyst utilized in the second reforming zone.
摘要:
Process for producing gasoline components from a hydrocarbonaceous feed containing hydrocarbons comprising at least 4 carbon atoms, and hydrocarbons obtained thereby. The process comprises:a. separating feed into a heavy fraction containing hydrocarbons comprising at least 7 carbon atoms and a light fraction containing hydrocarbons comprising at most 7 carbon atoms,b. isomerizing at least part of the light fraction at a temperature between 50.degree. and 300.degree. C.,c. separating effluent of step b) into a stream containing branched hydrocarbons and a stream containing normal hydrocarbons, andd. isomerizing at least part of the stream containing normal hydrocarbons at a temperature which is higher than the temperature applied in step b).
摘要:
The present invention is directed to a process for treating hydrotreated naphtha which involves treating the naphtha over massive nickel catalyst followed by treating the naphtha over a metal oxide under conditions effective for removing impurities from said naphtha to result in substantially purified naphtha, wherein the metal oxide is selected from the group of metal oxides having a free energy of formation of sulfide which exceeds said free energy of formation of platinum sulfide, such as manganous oxide. In so doing, naphtha in the gas phase in the presence of hydrogen is passed over the manganous oxide at a temperature within the range of about 800.degree. F. and 1100.degree. F., a hydrogen to oil molar ratio between about 1:1 and 6:1, a whsv between about 2 and 8, and pressure between about 50 and 300 psig; and the naphtha in the liquid phase at a temperature between about 300.degree. F. and about 350.degree. F., and whsv less than about 5 is passed over the massive nickel.The naphtha in the liquid phase, at about ambient temperature, and at a whsv between 2 and 10, may also be passed over a Na Y mole sieve prior to treating over massive nickel and manganous oxide. In addition the naphtha be being passed over alumina after treating over massive nickel and prior to treating over manganous oxided in the liquid phase, at a temperature between 300.degree. F. and 350.degree. F., and a whsv between 2 and 10.The naphtha may also be passed over a mole sieve water trap in the liquid phase at ambient temperature and at a whsv between 2 and 10, prior to treating over massive nickel and manganous oxide.
摘要:
A process for the use of such sorbent, or catalyst, to effectively remove sulfur from naphthas at temperatures above about 350.degree. F. without the significant production, if any, of PNA's. The invention embodies a particulate mass of a sorbent, or catalyst, comprised of nickel in concentration ranging from about 10 percent to about 70 percent, preferably from about 20 percent to about 50 percent, calculated as metallic nickel based on the total weight of the sorbent, iron in concentration ranging from about 1 percent to about 15 percent, preferably from about 2 percent to about 10 percent, calculated as metallic iron based on the total weight of the sorbent, or catalyst composition and a porous, refractory inorganic oxide such as silica, alumina, clays, or mixture thereof; preferably alumina, with which the nickel and iron are composited.