Abstract:
A process for reducing the sulfur content of coal comprising:(1) contacting an aqueous slurry of coal-oil agglomerates at elevated temperature with oxygen; and(2) recovering coal-oil agglomerates wherein the coal has reduced sulfur content.
Abstract:
A process for reducing the pyritic sulfur content of coal comprising the steps of:(1) contacting an aqueous slurry of water and pyrite-containing coal particles at elevated temperature with oxygen, the contacting of step 1 being such that without step 2 the aqueous slurry would have a pH of less than 5.5;(2) maintaining the aqueous slurry of step 1 at a pH of from about 5.5 to 12.0; and(3) recovering coal particles of reduced pyritic sulfur content.
Abstract:
A process for reducing the sulfur content of coal comprising the steps of:(1) contacting coal particles with a silicate selected from the group consisting of alkali metal silicates, alkaline earth metal silicates and mixtures thereof in an aqueous medium to reduce the sulfur content of the coal; and(2) recovering coal particles of reduced sulfur content.
Abstract:
A process for the removal of metal poisons such as nickel, iron and/or vanadium from a hydrocarbon conversion catalyst which includes the steps of contacting the catalyst with both a reductive wash and a subsequent oxidative wash to remove at least a portion of the metal poisons from the catalyst. A preferred oxidative wash medium comprises an aqueous solution of hydrogen peroxide. The vanadium and nickel metals may be recovered from the resultant used wash solutions for possible metallurgical use.
Abstract:
A process for reducing the sulfur content of coal comprising the steps of: 1. contacting coal particles with an aqueous solution of iron complexing agent, and an oxidant to preferentially oxidize at least a portion of the sulfur in the coal; 2. thermally treating the oxidized sulfur-containing coal at elevated temperature to reduce the sulfur content of the coal; and 3. recovering coal particles of reduced sulfur content.
Abstract:
A product of reduced sulfur content is produced from a feedstock which is comprised of a mixture of hydrocarbons and contains organic sulfur compounds as unwanted impurities. The process comprises converting at least a portion of the sulfur-containing impurities to sulfur-containing products of higher boiling point by treatment with an alkylating agent in the presence of an acid catalyst and removing at least a portion of these higher boiling products by fractional distillation. Suitable alkylating agents include alcohols and olefins. In a preferred embodiment, catalytic cracking products which contain aromatic sulfur compounds as impurities are used as a feedstock for the process.
Abstract:
Compositions comprising certain metal-containing materials distributed interactively on a deboronated HAMS-1B crystalline borosilicate molecular sieve which are useful for catalytically oxidizing or oxidatively dehydrogenating organic compounds such as alkanes, aromatics, and alkyl-substituted aromatics are described. Alkanes are oxidatively dehydrogenated to olefins, and an aromatic compound such as benzene can be oxidized by nitric and/or nitrous oxide to largely phenol or largely nitrobenzene depending upon the oxidation temperature. When the compound is a methylaromatic, oxidation produces an aromatic aldehyde. Alkyl groups larger than methyl oxidatively dehydrogenate to alkenyl groups. The compositions can be used in a process to separate p-xylene from a mixture of its isomers based upon the ability of the compositions, which preferably comprise a iron molybdenum material interactively distributed on a deboronated HAMS-1B crystalline borosilicate molecular sieve, to selectively oxidize the p-xylene to an aldehyde or dialdehyde while not substantially oxidizing the ortho and metaxylene isomers. Such partially oxidized mixtures of p-xylene are useful to make TPAA or as feeds to a water-based, further oxidation to make terephthalic acid. Carbon dioxide used as a carrier gas with a methylaromatic feed to the oxidation catalyst is shown to have a beneficial effect on yield and selectivity.
Abstract:
A composition of matter comprising at least one metal-containing spinel which includes a first metal and a second metal having a valence higher than the valence of the first metal, a minor amount of at least one-third metal component effective to promote the oxidation of sulfur dioxide to sulfur trioxide at sulfur dioxide oxidation conditions, and a minor amount of at least one-fourth metal component effective to promote the reduction of first metal sulfate at first metal sulfate reduction conditions. These compositions are useful, e.g., in hydrocarbon conversion processes, to reduce sulfur oxide and/or nitrogen oxide atmospheric emissions.
Abstract:
An improved process for converting hydrocarbons using a catalyst which is periodically regenerated to remove carbonaceous deposits, the catalyst being comprised of a mixture containing, as a major component, solid particles capable of promoting hydrocarbon conversion at hydrocarbon conversion conditions, and, as a minor component, discrete entities comprising at least one spinel, preferably alkaline earth metal-containing spinel, and a minor amount of at least one added component selected from the group consisting of alkali metal components, calcium components, barium components, strontium components, beryllium components and mixtures thereof.
Abstract:
A process for reducing the sulfur and ash content of coal comprising the steps of: (1) contacting coal particles containing ash and iron pyrite mineral matter with a promoting amount of at least one conditioning agent, said conditioning agent having a ferrous component maintained at a pH of from about 5.5 to 11.0 and being capable of modifying or altering the existing surface characteristics of the pyrite under conditions to effectuate alteration of modification of at least a portion of the contained pyritic sulfur; (2) agglomerating the coal particles while said pyrite surfaces are altered or modified in an aqueous medium with hydrocarbon oil to form coal-hydrocarbon oil agglomerates; (3) separating said coal-hydrocarbon oil agglomerates from pyrite mineral matter and ash to recover coal-hydrocarbon oil agglomerates wherein the coal exhibits reduced sulfur and ash content.