Hydrocarbon feeds suitable for use as gasoline blending components containing olefins and aromatic compounds are alkylated in the presence of a catalyst by the olefins present in the feedstream to produce middle distillates having higher boiling points suitable for use as aviation and diesel fuel blending components.

Aromatics extraction and hydrocracking processes are integrated with a stream pyrolysis unit to optimize the performance of the hydrocracking units by processing the aromatic-rich and aromatic-lean fractions separately in order to better control the hydrocracking operating severity and/or catalyst reactor volume design requirements.

The present invention provides a low viscosity poly--olefin lubricating oil and a synthesis method thereof. The method comprises: (1) the -olefin raw material is subjected to dehydration treatment so that the water content in the raw material is 10 ppm; (2) a reaction of the dehydration treated -olefin raw material is carried out in the presence of a complex catalyst and gaseous BF.sub.3 to obtain a reaction product, wherein the pressure of the gaseous BF.sub.3 is 0.01 to 1 MPa; (3) the reaction product obtained in step (2) is sequentially subjected to flash distillation, gas stripping, centrifugation, and washing treatment to obtain an intermediate product; (4) the intermediate product obtained in step (3) is subjected to distillation under reduced pressure to separate the unreacted -olefin raw material and -olefin dimers, and the remaining heavy fractions are subjected to hydrogenation saturation treatment followed by fractionation and cutting-off.

The present disclosure relates to a continuous refining method and device for treating waste plastic pyrolysis oil by introducing the oil into a first reactor and allowing an isodewaxing reaction to proceed at a first temperature in the presence of a weak acid site catalyst to form a first product; introducing the first product into a second reactor and hydrotreating the first product at a second temperature in the presence of a hydrotreating catalyst to allow a dechlorination reaction to proceed to form a second product; and introducing the second product into a third reactor and hydrotreating the second product at a third temperature in the presence of a hydrotreating catalyst to allow a denitrification reaction to form a third product, which can minimize process problems, improve operational stability, reduce impurities such as chlorine and metal, and provide internal isomers to improve the flow point and low temperature fluidity.

The invention concerns a process for the production of middle distillates, comprising at least one step for the catalytic oligomerization of a feed comprising olefins containing 3 to 9 carbon atoms, in which the reaction section comprises at least two reactors which are positioned in series and which can be permutated, each containing at least one oligomerization catalyst for the oligomerization reactions, said catalysts being identical or different, and in which the reactor which is the furthest downstream in the direction of movement of said feed comprising olefins contains the catalyst with a period of service which is shorter than the period of service of the catalysts present in the other reactors and is operated at an average temperature (WABTn) which is lower than the average temperature (WABTn1) of the reactor directly preceding it, the difference between said average temperatures being at least 10 C. (WABTn1WABTn10 C.).

The present disclosure relates to a method for upgrading hydrocarbon using C4, C5 and C6 streams, and more specifically, to a method for upgrading hydrocarbons using C4, C5 and C6 streams. The method includes the steps of: preparing C4, C5 and C6 streams, which are the products of naphtha catalytic cracking (NCC) process, heavy oil upgrading process, thermal cracking process, or fluidized catalytic cracking (FCC or RFCC) process; oligomerizing the C4, C5 and C6 streams with a catalyst to produce branched unsaturated hydrocarbons; and fractional distillating the branched unsaturated hydrocarbons to separate into C14-18 products or C32-40 products.

Implementations described herein generally relate to methods for purifying alpha-olefins. The alpha-olefins may be used to form drag reducing agents for improving flow of hydrocarbons through conduits, particularly pipelines. In one implementation, a method of increasing alpha-olefin content is provided. The method includes providing an olefin feedstock composition having an alpha-mono-olefin and at least one of a diolefin having an equal number of carbon atoms to the alpha-mono-olefin and/or a triolefin having an equal number of carbon atoms to the alpha-mono-olefin. The method further includes contacting the olefin feedstock composition with ethylene in the presence of a catalyst composition including an olefin metathesis catalyst. The method further includes reacting the olefin feedstock composition and ethylene at metathesis reaction conditions to produce an alpha-olefin product comprising the alpha-mono-olefin and alpha-olefins having fewer carbon atoms than the alpha-mono-olefin.

Processes and apparatuses for producing para-xylenes are provided. The processes comprises providing a reformate stream comprising aromatic hydrocarbons to a reformate splitter to provide a reformate bottoms stream and a reformate overhead stream. A portion of the reformate bottoms stream is passed to a para-xylene separation unit for separating para-xylene, wherein the portion of the reformate bottoms stream is passed to the para-xylene separation unit without an intermediate step for removal of olefins.

Provided herein is a unique process that prepares a saturated hydrocarbon mixture with well-controlled structural characteristics that address the performance requirements driven by the stricter environmental and fuel economy regulations for automotive engine oils. The process allows for the branching characteristics of the hydrocarbon molecules to be controlled so as to consistently provide a composition that has a surprising CCS viscosity at 35 C. (ASTM D5329) and Noack volatility (ASTM D5800) relationship. The process comprises providing a specific olefinic feedstock, oligomerizing in the presence of a BF.sub.3 catalyst, and hydroisomerizing in the presence of a noble-metal impregnated, 10-member ring zeolite catalyst.

A process for the hydrotreatment of a fuel gas stream containing up to 15% olefins comprises the steps of introducing the fuel gas stream into at least one co-current reactor, where the stream is split into two flow fractions, of which one fraction is routed through an olefin treatment section, while the other fraction is routed through another section, subjecting the sections to heat exchange, combining the two flows, thereby equalizing temperatures and compositions, cooling the combined flow over a heat exchanger and reacting the combined flow to equilibrium in an adiabatic hydrotreatment reactor. A second co-current reactor with intercooling arranged in series after the first cocurrent reactor and before the final adiabatic reactor is used if the fuel gas stream contains more than 8% olefins.