摘要:
A pretreatment process for removal of contaminants from a light hydrocarbon feedstock is presented. The feedstock is passed to a first adsorption zone containing a molecular sieve and thereafter passed to a second adsorption zone containing activated alumina. The process produces a hydrocarbon feedstock substantially free of sulfur compounds, oxygenates, and water. Such a process finds utility as a feed pretreatment step preceding a catalytic isomerization process.
摘要:
A process is disclosed for the production of isopropanol and tertiary butyl alcohol from C.sub.3 and C.sub.4 hydrocarbons. The preferred embodiment of the invention comprises dehydrogenation of paraffins and direct hydration of the resulting olefins. Fractional distillation steps are employed between the dehydrogenation and dehydration zones and in the recycle stream to recover unconverted hydrocarbons leaving the hydration zone. This accommodates different hydration rates and prevents the passage of propylene into the dehydrogenation zone. In an alternative embodiment, the feed stream comprises olefins and is fed to the fractionation system. The dehydrogenation zone may be deleted from this embodiment.
摘要:
Alcohols may be obtained by an indirect hydration of olefinic hydrocarbons in which said olefinic hydrocarbon is esterified by treatment with an inorganic acid to form dialkyl and alkyl hydrogen salts. The esters are then hydrolyzed with water, the reconstituted acid is stripped by means of a stripping agent such as nitrogen gas, and the resulting alcohols and ethers are recovered. The alcohol production is separated from the dialkyl ether, the latter then being subjected to further treatment such as thermal decomposition and hydrolysis to form an additional amount of the desired alcohol. The reconstituted inorganic acid may be recycled for use as an esterifying agent without having to reconstitute the acid.
摘要:
Olefinic compounds, and particularly olefinic hydrocarbons, containing from 2 to about 4 carbon atoms may be subjected to a direct hydration process utilizing a dilute aqueous sulfuric acid to treat the olefin at reaction conditions which will include a temperature in the range of from about 100.degree. to about 300.degree. C. and a pressure in the range of from about 1 to about 250 atmospheres. In addition, if so desired, a transition metal sulfate may also be present in the reaction mixture.
摘要:
Surfacing compositions are provided which comprise a mixture of mineral aggregate, the residuum of a bituminous emulsion and a silane of the formulaR.sup.b -- R.sup.a -- Si -- X.sub.3wherein (a) X represents halogen or alkoxy, (b) R.sup.a represents alkylene and (c) R.sup.b represents amino, aminoalkylene amino, gamma-glycidoxy, hydrocarbyl, acyloxy or mercapto.
摘要:
Built-up roofing employing precoated felts are inhibited from slipping by the use of bituminous emulsions to bind the felts. A minor amount of a compatible latex is incorporated into the emulsion to increase the adhesion of the bonded felts.
摘要:
Byproduct formation in aromatic alkylation processes is reduced when different polyalkylated aromatic compounds are first fractionated into separate streams enriched in these respective polyalkylated aromatic compounds, and the separate streams are sent to different transalkylation reaction zones, which may or may not be in the same reactor. The different transalkylation reaction zones allow for greater control of the transalkylation of the respective polyalkylated aromatic compounds, such as diisopropylbenzene (DIPB) and triisopropylbenzene (TIPB) that accompany the alkylation of benzene with propylene in a process for cumene production.
摘要:
An electric pump has a stator, a rotor, a pump volute, and an endshield. The pump volute and the endshield are formed together as a single monolithic part, thereby minimizing the axial length of the electric pump. A drainage passageway is provided on the endshield to harmlessly drain away any fluid that seeps past the pump's seals. In one embodiment of the invention, the drainage passageway is a groove that faces the stator and is configured to facilitate the evaporation of and leak fluid by channeling the fluid near the stator, which warms the fluid and thereby increases the fluid's evaporation rate.
摘要:
A aromatic alkylation catalyst, processes for producing the catalyst, and aromatic alkylation processes employing the catalysts are disclosed. The catalyst comprises a UZM-8 zeolite and nitrogen, and the catalyst has a nitrogen to zeolite aluminum molar ratio of at least about 0.015. In an exemplary alkylation process, the catalyst provides improved product yield.
摘要:
The present invention provides a process for decomposing a cumene hydroperoxide to produce phenol and acetone. The process utilizes a solid catalyst that can be non-layered or layered. The process includes: (1) introducing a process stream containing cumene hydroperoxide into a reaction vessel; (2) contacting the process stream with catalyst particles to form a process stream; and (3) withdrawing a portion of the product stream from the reactor and recovering phenol and acetone products.