Patent ES-8602568-A1 (ES)
Title: Integrated HF regeneration in aromatic hydrocarbon alkylation process.
IPC: C07C2/68
Filed: 1984-09-21
Abstract: A process for the production of linear alkylaromatic hydrocarbons in which a feed aromatic hydrocarbon is reacted with a C8-plus normal olefinic hydrocarbon in the presence of liquid phase HF having a first plurality, and which acts as an alkylation catalyst in a reaction zone and thereby producing a first hydrocarbon admixture comprising residual feed aromatic hydrocarbon and a product linear alkylaromatic hydrocarbon said first hydrocarbon admixture is contacted with liquid phase HF havinga higher second purity in a contacting zone and thereby producing a second hydrocarbon admixture comprising the feed aromatic hydrocarbon and the product linear alkylaromatic hydrocarbon the second hydrocarbon admixture is passed into a fractionation column the compounds entering the fractionation column are separated into an overhead vapour stream comprising HF and a net bottoms stream comprising benzene and the product alkylaromatic hydrocarbon a stream of high purity liquid HF and a third hydrocarbon stream comprising the feed aromatic hydrocarbon are recovered from the overhead vapour stream of the fractionation column, the high purity liquid HF is passed into the contacting zone as regenerated HF the product alkylaromatic hydrocarbon is recovered from the net bottoms stream, and an HF stream comprising HF and dissolved high boiling hydrocarbons is withdrawn from the reactor, characterised in that a portion of the HF stream withdrawn from the reactor is passed into the fractionation column and the hydrocarbon stream recovered from the overhead vapour stream of the fractionation column is recycled totally to the contacting zone. - (9pp) EPAB- EP-137288 B A process for the production of linear alkylaromatic hydrocarbons in which a feed aromatic hydrocarbon is reacted with a C8-plus normal olefinic hydrocarbon in the presence of liquid phase HF having a first plurality, and which acts as an alkylation catalyst in a reaction zone and thereby producing a first hydrocarbon admixture comprising residual feed aromatic hydrocarbon and a product linear alkylaromatic hydrocarbon said first hydrocarbon admixture is contacted with liquid phase HF having higher second purity in a contacting zone and thereby producing a second hydrocarbon admixture comprising the feed aromatic hydrocarbon and the product linear alkylaromatic hydrocarbon the second hydrocarbon admixture is passed into a fractionation column the compounds entering the fractionation column are separated into an overhead vapour stream comprising HF and a net bottoms stream comprising benzene and the product alkylaromatic hydrocarbon a stream of high purity liquid HF and a third hydrocarbon stream comprising the feed aromatic hydrocarbon are recovered from the overhead vapour stream of the fractionation column, the high purity liquid HF is passed into the contacting zone as regenerated HF the product alkylaromatic hydrocarbon is recovered from the net bottoms stream, and an HF stream comprising HF and dissolved high boiling hydrocarbons is withdrawn from the reactor, characterised in that a portion of the HF stream withdrawn from the reactor is passed into the fractionation column and the hydrocarbon stream recovered from the overhead vapour stream of the fractionation column is recycled totally to the contacting zone. - EP-137288 B A process for the production of linear alkylaromatic hydrocarbons in which a feed aromatic hydrocarbon is reacted with a C8-plus normal olefinic hydrocarbon in the presence of liquid phase HF having a first plurality, and which acts as an alkylation catalyst in a reaction zone and thereby producing a first hydrocarbon admixture comprising residual feed aromatic hydrocarbon and a product linear alkylaromatic hydrocarbon said first hydrocarbon admixture is contacted with liquid phase HF havinga higher second purity in a contacting zone and thereby producing a second hydrocarbon admixture comprising the feed aromatic hydrocarbon and the product linear alkylaromatic hydrocarbon the second hydrocarbon admixture is passed into a fractionation column the compounds entering the fractionation column are separated into an overhead vapour stream comprising HF and a net bottoms stream comprising benzene and the product alkylaromatic hydrocarbon a stream of high purity liquid HF and a third hydrocarbon stream comprising the feed aromatic hydrocarbon are recovered from the overhead vapour stream of the fractionation column, the high purity liquid HF is passed into the contacting zone as regenerated HF the product alkylaromatic hydrocarbon is recovered from the net bottoms stream, and an HF stream comprising HF and dissolved high boiling hydrocarbons is withdrawn from the reactor, characterised in that a portion of the HF stream withdrawn from the reactor is passed into the fractionation column and the hydrocarbon stream recovered from the overhead vapour stream of the fractionation column is recycled totally to the contacting zone. (9pp) USAB- US4467128 A Prodn. of linear alkylaromatics is carried out by: (a) reacting, in an alkylation zone (A), an aromatic feed (I) esp. benzene, with an 8C + n-olefin (II) in the presence of liq.-phase HF catalyst (III), producing a reaction effluent (IV) comprising alkylaromatic product (V) and residual (I) (b) contacting (IV) in the connecting zone (B) with higher-purity (III) to produce a second reaction effluent (VI) (c) passing (IV), in admixture with an HF-stream withdrawn from (A) to a fractionation (HF-stripping) zone (C), the fractionation yielding (i) an HF-contg. overhead vapour stream (VII) and (ii) a bottom stream (VIII) contg. (V) and (d) recovering (V) from (VIII) and recovering high-purity (III) from (VII) for recycle to (B).