US 5,516,963 AGranted

Hydrocarbon conversion with additive loss prevention

AssigneeUop LLC

InventorsAndrew S. Zarchy, Chien C. Chao

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Abstract

An adsorption arrangement in combination with a catalytic hydrocarbon conversion process suspends non-hydrocarbon materials that act to enhance the operation of the conversion zone by using an adsorption zone arrangement to keep the compounds in recirculation about the reaction zone. The process of this invention is particularly useful for the isomerization of hydrocarbons wherein the adsorption zone arrangement operates to maintain chloride compounds in the reaction zone and to prevent contamination of product streams with the chloride compounds. This invention can be used in combination with traditional adsorptive methods of removing contaminant from feedstreams that enter reaction zones. The invention is also useful for sulfided catalysts where it is desirable to maintain sulfur within the reaction zone and keep sulfur contamination from entering product streams.

Claims20

Dependent claims

A process for the catalytic conversion of a feedstream comprising hydrocarbons in the presence of a beneficent material that enhances performance of the conversion zone, said process comprising,

a) contacting a first stream comprising hydrocarbons with a catalyst in a reaction zone in the presence of a beneficent material at hydrocarbon conversion conditions to convert hydrocarbons and produce a second stream comprising converted hydrocarbons that have contacted said catalyst and said material;
b) separating said second stream into a third stream and a fourth stream containing said beneficent material;
c) passing at least a portion of said fourth stream to an adsorption zone containing an adsorbent having adsorption capacity for said material and contacting said portion of said fourth stream with said adsorbent at adsorption conditions, adsorbing said material on said adsorbent and producing a fifth stream having a reduced concentration of said material relative to said fourth stream;
d) passing a desorption stream comprising at least a portion of said third stream or said fifth stream to said adsorption zone after adsorption of said material at desorption conditions to desorb said material from said adsorbent and produce a desorption effluent stream;
and,
e) combining at least a portion of said desorption effluent stream with a hydrocarbon feedstream to produce said first stream.

3 more elements

A process for the isomerization of a hydrocarbon feed containing normal hydrocarbons with a chloride promoted catalyst, said process comprising:

(a) passing a first stream comprising normal hydrocarbons through a chloride adsorption zone containing an adsorbent for the adsorption of a chloride containing compound at desorption conditions and desorbing a chloride containing compound into said first stream to produce a second stream containing normal hydrocarbons and a chloride compound;
(b) combining said second stream with a hydrocarbon feedstream to produce a combined feedstream and passing said combined feedstream to an isomerization reaction zone and contacting said combined stream with a chloride promoted isomerization catalyst at isomerization conditions to convert normal hydrocarbons to non-normal hydrocarbons and producing an isomerization zone effluent stream;
(c) passing at least a portion of said isomerization zone effluent stream to a separation zone and separating said portion of said isomerization zone effluent stream into a gaseous phase stream and a liquid phase stream;
(d) passing at least a portion of said gaseous phase stream to said chloride adsorption zone containing an adsorbent for the adsorption of said chloride compound and adsorbing said chloride compound from said effluent stream for desorption in step (a);
(e) recovering a third stream from said adsorption of step (d) having a reduced concentration of chloride compounds relative to said gaseous phase stream;
and,
(f) passing at least a portion of said liquid phase stream through said adsorption zone as said first stream of step (a).

4 more elements

Dependencies are inferred from the claim text.