US 5,157,196 A · Paraffin alkylation process

Abstract

Paraffin alkylation using solid, particulate catalyst is carried out by preparing an alkane-catalyst mixture in a wash zone, passing the alkane-catalyst mixture to a plug flow reactor where a minor amount of olefin is introduced to contact the alkane-catalyst mixture and react to form alkylate and the alkane-catalyst-alkylate mixture is passed through the reactor with a minimum of back mixing to restrict the reaction of alkylate with olefin, thus substantially preventing polymerization. The alkane-catalyst-alkylate mixture, substantially free of olefin is passed to a disengaging zone where the liquid is removed and the solid particulate catalyst is recovered and returned to the wash zone for recycle. The alkane is present in the reactor in sufficient molar excess to react substantially all of the olefin. Any unreacted isoalkane is recycled to the reactor with make-up isoalkane added to maintain the molar excess. The preferred catalyst is an acid washed silica treated with antimony pentafluoride and more preferably treated with alkane at low temperature, e.g. -30.degree. to -160.degree. C.

Claims29

Dependent claims

In a process of the alkylation of alkanes with olefins int he presence of a particulate solid acidic catalyst in a reactor, the improvement comprising first contacting said catalyst with alkane, feeding said catalyst-alkane mixture to a reactor, feeding an olefin to said reactor to contact said catalyst-alkane mixture to form an alkylate product and moving said catalyst-alkane-alkylate mixture through said reactor away from the olefin feed point in the substantial absence of back mixing to restrict additional contact of the catalyst-alkane-alkylate mixture with the olefin feed.

Dependencies are inferred from the claim text.

Paraffin alkylation process

Life of this patent

Paraffin alkylation process

Life of this patent

Abstract

Claims29