摘要:
A continuous multistage catalytic conversion system for upgrading lower olefins comprisingfirst adaibatic catalytic bed reactor means containing an acidic zeolite solid catalyst;means for feeding light olefinic gas directly to the first reactor without addition of separate diluent or recycle streams;means for operating the first reactor under olefin partial conversion conditions at elevated temperature to control adiabatic temperature increase;interstage quench means for injecting a liquid coolant directly into first stage effluent for reducing the temperature thereof and protecting downstream catalyst;second catalytic bed reactor means for receiving cooled first stage effluent with injected liquid coolant and further converting the olefins over a metallic zeolite catalyst having a metal ethene oligomerization component;means for cooling and recovering heavier liquid hydrocarbon product from the second reactor effluent; andmeans for recovering liquid coolant from the second effluent for recycle to the interstage quench means.
摘要:
An oligomerization system is provided for upgrading lower olefins to distillate hydrocarbons, especially useful as high quality jet or diesel fuels. Thye olefinic feedstock is reacted over a shape selective acid zeolite, such as ZSM-5, to oligomerize feedstock olefins and further convert recycled hydrocarbons. Reactor effluent is fractionated to recover a light-middle distillate range product stream and to obtain gasoline and heavy hydrocarbon streams for recycle.
摘要:
Alkylate is produced by catalytically converting oxygenate feedstock, such as methanol, to lower olefins comprising C.sub.2 -C.sub.4 olefins. Ethene is separated by interstage sorption of C.sub.3 + components and an isoparaffin is alkylated with C.sub.3 -C.sub.4 olefins.The improved technique comprises fractionating an olefinic feedstream containing ethene and C.sub.3 + olefinic components by contacting the olefinic feedstream in a sorption zone with a liquid hydrocarbon sorbent to selectively sorb C.sub.3 + components; reacting C.sub.3 + olefins with excess isoparaffin in a catalytic alkylation reactor to produce C.sub.7 + alkylate hydrocarbons; fractionating the alkylation reactor effluent to provide a liquid hydrocarbon fraction rich in C.sub.4 + isoparaffin for recycle to the sorption zone as lean sorbent; and recovering C.sub.7 + alkylate product from the process.
摘要:
Alkylate is produced by catalytically converting oxygenate feedstock, such as methanol, to lower olefins comprising C.sub.2 -C.sub.4 olefins. Ethene is separated by interstage sorption of C.sub.3 + components and an isoparaffin is alkylated with C.sub.3 -C.sub.4 olefins derived from sorbate.The improved technique comprises fractionating an olefinic feedstream containing ethene and C.sub.3 + olefinic components by contacting the olefinic feedstream in a sorption zone with a liquid hydrocarbon sorbent to selectively sorb C.sub.3 + components; reacting C.sub.3 + olefins with excess isoparaffin in a catalytic alkylation reactor to produce C.sub.7 + alkylate hydrocarbons; fractionating the alkylation reactor effluent to provide a liquid hydrocarbon fraction rich in C.sub.7 +, alkylate for recycle to the sorption zone as lean sorbent; and recovering C.sub.7 + alkylate product and C.sub.5 + gasoline from the process.
摘要:
Olefin upgrading in plural reactors can achieve conversion of lower olefinic feedstock, such as propene, butene, etc., to valuable heavy hydrocarbons containing a lubricant fraction of high viscosity index. Other fuel products, such as (C.sub.10 -C.sub.20) distillate, gasoline and LPG may also be recovered as products. In a preferred process for converting lower olefinic feed to heavier hydrocarbons by contacting the feed with a shape selective medium pore acidic zeolite catalyst at elevated temperature and pressure the catalyst surface is rendered relatively inactive by adding to the olefinic feed an inactivating amount of a sterically-hindered organic base, whereby the catalyst is selectively surface-deactivated, to produce substantially linear heavier hydrocarbons rich in C.sub.10.sup.+ olefins. In the preferred multi-stage process the olefinic feed comprises C.sub.2 -C.sub.8 olefins and the catalyst employed in each stage comprises aluminosilicate having a silica-to-alumina mole ratio of at least 12 and a constraint index of about 1 to 12.
摘要:
An integrated system is provided for converting methanol or the like to heavy hydrocarbon products, especially distillate range hydrocarbons. In a first stage catalytic process oxygenate feedstock is converted to lower olefins. Byproduct aromatics are passed through a second stage oligomerization reactor with olefins. Distillate range hydrocarbons are recovered and hydrotreated to provide an improved fuel product.
摘要:
A reactor sequencing technique is useful for multi-stage hydrocarbon conversion systems employing a number of fixed bed catalytic reactors at various process temperatures and catalytic activity levels. A process for oligomerizing lower olefins (e.g., C.sub.2 -C.sub.6) is disclosed wherein catalyst partially inactivated in a primary stage is employed to effect conversion at higher temperature in a secondary stage prior to catalyst regeneration.
摘要:
A continuous technique for upgrading light olefinic crackate gas from hydrocarbon cracking comprising methods and means for: (a) compressing and cooling a first portion of the light crackate gas to provide a first pressurized ethene-rich vapor stream and a first condensed crackate stream rich in C.sub.3.sup.+ aliphatics; (b) contacting said first ethene-rich vapor stream under pressure with a C.sub.5 + liquid sorbent stream in a gas-liquid contact absorber column under sorption conditions to selectively absorb a major amount of C.sub.3.sup.+ components; (c) recovering a second ethene-rich vapor stream overhead from the absorber column; (d) converting said second ethene-rich vapor stream in a reaction zone in once-through contact with a fluidized bed of said medium pore zeolite catalyst solid particles under oligomerization conditions to produce an olefinic hydrocarbon effluent stream rich in C.sub.5 + hydrocarbons; (e) cooling and separating the reaction effluent stream to provide a light offgas stream and a condensed liquid hydrocarbon product stream; (f) fractionating the condensed liquid hydrocarbon product stream in the absorber column concurrently with sorption of the first ethene-rich vapor stream for recovery of liquid hydrocarbon product with an absorber bottoms liquid stream rich in C.sub.3.sup.+ components; (g) further fractionating the absorber bottoms liquid stream to provide a C.sub.3 -C.sub.4 product and a liquid hydrocarbon fraction consisting essentially of C.sub.5.sup.+ hydrocarbons; (h) recycling at least a portion of the C.sub.5.sup.+ liquid hydrocarbon fraction to the absorber column as the liquid sorbent stream; and bypassing a second portion of said light crackate gas around said absorber to the reaction zone for conversion concurrently with said second ethene-rich vapor stream.
摘要:
Separation and recovery of liquid hydrocarbons in a FCC gas plant is improved by integrating therewith a catalytic bed oligomerization reactor which produces predominantly olefinic liquid hydrocarbons from at least one olefinic stream within the gas plant.
摘要:
A process for removing oxygenated impurities from a hydrocarbon stream includes extracting said oxygenates by a heavy organic polar solvent, water scrubbing the extracted hydrocarbon to recover dissolved solvent and combining the solvent phase from the extractor and the water phase from the scrubber and distilling to recover the solvent.