Abstract:
This invention is directed to producing a high yield of aromatics from naphtha by integrating a catalytic reformer and a thermal hydrocracking unit followed by fractionating the product stream to obtain the desired aromatic. In this process, after sulfur is removed, the naphtha is catalytically reformed under conditions adapted to provide the maximum aromatic content. The reformed stream is then thermally hydrocracked, preferably in a system containing multiple reactors. The process does not require an external source of hydrogen since the reforming and hydrocracking units are operated to maintain a hydrogen balance. The hydrocracked stream is fractionated in a series of columns to produce the desired mix of aromatics. In one example, the fractionation separates out (1) benzene, which is further purified, if necessary (2) a toluene stream and a C.sub.9 + aromatic stream which are charged to a transalkylation reactor to produce a composition containing mixed xylenes sent to recycle and (3) a mixed xylene stream from which paraxylene is separated by a liquid-solid adsorption technique and from which the remaining xylenes are isomerized to produce further paraxylene. A by-product stream of light hydrocarbons is also produced. This procedure can be readily modified to produce greater amounts of benzene and/or toluene and less xylene.
Abstract:
A two-step process for preparing a stabilized lubricating oil resistant to oxidation and sludge formation upon exposure to a highly oxidative environment is provided. The first step of the present process comprises contacting a lubricating oil stock with elemental sulfur in the presence of a catalyst material selcted from the group consisting of alumina, silica, aluminosilicate, a metal of Groups II-A, II-B, VI-B or VIII of the Periodic Table of Elements, an oxide of a metal of Groups II-A, II-B, VI-B or VIII, a sulfide of a metal of Groups II-A, II-B, VI-B or VIII, clay, silica combined with an oxide of a metal of Groups II-A, III-A, IV-B or V-B, and combinations thereof in a flow reactor or under conditions comparable to those existing in a flow reactor. The second step of the present process comprises contacting the product of the first step with hydrogen in the presence of alumina impregnated with at least about 10 weight percent of MoO.sub.3 and at least about 2.5 weight percent of CoO, said impregnated alumina having at least 50 percent of its pores with a pore diameter of 50 Angstrom Units or more.
Abstract:
Hydrocarbon mixtures having low sulfur contents are obtained from sulfur-containing vacuum gas oils by hydrodesulfurizing the gas oils under mild hydrodesulfurizing conditions, including use of:1. a select high-activity hydrodesulfurization catalyst,2. a temperature in the range 550.degree.F. to 850.degree. F., and3. a hydrogen partial pressure in the range 300 to 800 psig.New and advantageous results are obtained by integrating the foregoing process with one or more other process steps including:1. hydrodesulfurization of sulfur-containing vacuum residuum,2. solvent deasphalting of vacuum residuum, or3. hydrodesulfurizing a vacuum residuum and delayed coking at least a portion of the product.
Abstract:
A process for the conversion of a hydrocarbonaceous black oil, wherein the terminal heating of the black oil before conversion is performed by the admixture of said black oil with a gas comprising steam and having a temperature greater than the hydrocarbon conversion temperature.
Abstract:
The removal of particulate solids containing iron sulfides from hydrogenated coal liquids by magnetic separation is improved by pretreatment of the liquid with a gas mixture containing hydrogen and hydrogen sulfide. The coal-derived liquid is contacted with the gas mixture containing at least about 2 vol. % hydrogen sulfide, with the remainder of the gas mixture comprising principally hydrogen. Residue time for the liquid-gas contact should be at least about two minutes and temperature should be less than about 650.degree.F. The treated liquid is then passed through a magnetic field having strength of at least about 3000 gauss to achieve substantial removal of sulfur-containing solids from the liquid. The magnetic solids are then removed from the separator unit, e.g., by flushing using a light solvent oil, and the remaining liquid fraction carrying less-magnetic solids is passed on to further processing.
Abstract:
Hydrated alkali metal sulfides used to remove sulfur from fossil fuels to form alkali metal polysulfides which are recycled to alkali metal sulfides and elemental sulfur by thermal or thermal reduced pressure decomposition of the alkali metal polysulfides or by conversion of the hydrolysis products entirely by H.sub.2 S.
Abstract:
A transformer oil processing sequence is disclosed. The process comprises contacting a naphthenic based oil with an oxygen-containing gas in the presence of a free radical initiating catalyst under mild oxidation conditions of temperature and pressure, fractionally distilling the resultant product and then hydrogenating the oil.
Abstract:
Heated hydrocarbon crude oil is passed into a first flash zone wherein it is separated into a first flash vapor and a first flash liquid. First flash vapor is water washed to remove soluble contaminants, and the resulting wash water and the first flash liquid are passed to a desalter. First flash liquid having substantial freedom from water soluble contaminants is passed from the desalter into a second flash zone wherein it is separated into a second flash vapor and a second flash liquid. The second flash liquid is passed into a conventional fractionation zone comprising a crude column and a vacuum column.
Abstract:
Upgrading of 350.degree. F plus product of Fischer-Tropsch Synthesis is accomplished by hydrotreating the Fischer-Tropsch Synthesis product and selective cracking the hydrotreated material boiling above about 600.degree. F. A product slate is recovered comprising LPG, gasoline, jet fuel, light and heavy oil fractions.
Abstract:
A process for producing coke from sulfur-containing hydrocarbon feedstocks which involves contacting at least a portion of the feedstock with a peroxy oxidant in the presence of a metal-containing catalyst to preferentially oxidize a portion of the hydrocarbon feedstock, subjecting the feedstock to coking conditions to form coke and recovering a coke product. The present process can provide improved yields of coke having substantially reduced sulfur content.