US 4,364,820 AGranted

Recovery of C.sub.3 + hydrocarbon conversion products and net excess hydrogen in a catalytic reforming process

AssigneeUop LLC

InventorsRichard R. DeGraff, Kenneth D. Peters

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Abstract

This invention relates to a hydrocarbon conversion process effected in the presence of hydrogen, especially a hydrogen-producing hydrocarbon conversion process. More particularly, this invention relates to the catalytic reforming of a naphtha feedstock, and is especially directed to an improved recovery of the net excess hydrogen, and to an improved recovery of a C.sub.3 + normally gaseous hydrocarbon conversion product and a C.sub.5 + hydrocarbon conversion product boiling in the gasoline range.

Claims9

Dependent claims

A hydrocarbon conversion process comprising the steps of:

(a) treating a hydrocarbonaceous feedstock in a reaction zone in admixture with hydrogen and in contact with a hydrocarbon conversion catalyst at hydrocarbon conversion conditions of temperature and pressure to provide a reaction zone effluent stream comprising normally liquid and normally gaseous hydrocarbon conversion products admixed with hydrogen;
(b) treating said effluent stream in a first gas-liquid separation zone at a reduced temperature effecting the separation of a liquid hydrocarbon phase and a hydrogen-rich vapor phase;
(c) recycling a portion of said hydrogen-rich vapor phase to said reaction zone in admixture with said hydrocarbonaceous feedstock;
(d) admixing the balance of said vapor phase with a liquid hydrocarbon phase recovered from a third gas-liquid separation zone in accordance with step (f), and treating said mixture in a second gas-liquid separation zone at substantially the same temperature as said first separation zone and at an elevated pressure relative thereto to effect the separation of a liquid hydrocarbon phase having a reduced concentration of hydrogen and C.sub.2 - hydrocarbons, and a hydrogen-rich vapor phase having a reduced concentration of C.sub.3 + hydrocarbons;
(e) treating the last mentioned liquid hydrocarbon phase in a fractionation column at conditions to separate an overhead fraction comprising light hydrocarbon conversion products from the higher boiling hydrocarbon conversion products;
(f) admixing the last mentioned hydrogen-rich vapor phase separated in accordance with step (d) with the liquid hydrocarbon phase separated in accordance with step (b), and treating said mixture in a third gas-liquid separation zone at substantially the same temperature as said second separation zone and at an elevated pressure relative thereto to effect the separation of a liquid hydrocarbon phase having a reduced concentration of hydrogen and C.sub.2 - hydrocarbons, and a hydrogen-rich vapor phase having a reduced concentration of C.sub.3 + hydrocarbons;
and,
(g) recovering said hydrogen-rich vapor phase, and admixing said liquid hydrocarbon phase with the hydrogen-rich vapor phase from step (b) in accordance with step (d).

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Dependencies are inferred from the claim text.

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Abstract

A hydrocarbon conversion process comprising the steps of:

(a) treating a hydrocarbonaceous feedstock in a reaction zone in admixture with hydrogen and in contact with a hydrocarbon conversion catalyst at hydrocarbon conversion conditions of temperature and pressure to provide a reaction zone effluent stream comprising normally liquid and normally gaseous hydrocarbon conversion products admixed with hydrogen;
(b) treating said effluent stream in a first gas-liquid separation zone at a reduced temperature effecting the separation of a liquid hydrocarbon phase and a hydrogen-rich vapor phase;
(c) recycling a portion of said hydrogen-rich vapor phase to said reaction zone in admixture with said hydrocarbonaceous feedstock;
(d) admixing the balance of said vapor phase with a liquid hydrocarbon phase recovered from a third gas-liquid separation zone in accordance with step (f), and treating said mixture in a second gas-liquid separation zone at substantially the same temperature as said first separation zone and at an elevated pressure relative thereto to effect the separation of a liquid hydrocarbon phase having a reduced concentration of hydrogen and C.sub.2 - hydrocarbons, and a hydrogen-rich vapor phase having a reduced concentration of C.sub.3 + hydrocarbons;
(e) treating the last mentioned liquid hydrocarbon phase in a fractionation column at conditions to separate an overhead fraction comprising light hydrocarbon conversion products from the higher boiling hydrocarbon conversion products;
(f) admixing the last mentioned hydrogen-rich vapor phase separated in accordance with step (d) with the liquid hydrocarbon phase separated in accordance with step (b), and treating said mixture in a third gas-liquid separation zone at substantially the same temperature as said second separation zone and at an elevated pressure relative thereto to effect the separation of a liquid hydrocarbon phase having a reduced concentration of hydrogen and C.sub.2 - hydrocarbons, and a hydrogen-rich vapor phase having a reduced concentration of C.sub.3 + hydrocarbons;
and,
(g) recovering said hydrogen-rich vapor phase, and admixing said liquid hydrocarbon phase with the hydrogen-rich vapor phase from step (b) in accordance with step (d).

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