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US 4,058,452 AGranted
Alkylaromatic hydrocarbon dealkylation process
AssigneeUop LLC
InventorRobert S. Loboda
Life of this patent
Estimating the term…
Abstract
A process for the dealkylation of alkylaromatic hydrocarbons wherein a hydrogen-rich gas stream passed through the reaction zone on a once-through basis is obtained by passing a hydrogen-containing feed gas stream into an absorber to remove light paraffins, and the gas separated from the reaction zone effluent by partial condensation is passed into a stripper as the stripping media used to remove these same light paraffins from the liquid used in the absorber. Processes for removing and hydrotreating are also described.
Claims7
A hydrocarbon conversion process which comprises the steps of:
- a. passing a feed gas stream comprising hydrogen and C.sub.2 -C.sub.4 paraffins through an absorption zone operated under conditions effective to remove C.sub.2 -C.sub.4 paraffins, including countercurrent contact with a stripping zone liquid effluent stream, and thereby forming a hydrogenrich gas stream and an absorption zone liquid effluent stream;
- b. passing the absorption zone liquid effluent stream into a stripping zone operated at conditions effective to cause the removal of C.sub.2 -C.sub.4 paraffins from absorption zone liquid effluent stream, including countercurrent contact with a gaseous stripping media, and thereby forming the stripping zone liquid effluent stream and an off-gas stream comprising hydrogen and C.sub.2 -C.sub.4 paraffins;
- c. admixing the hydrogen-rich gas stream with a hydrocarbon feed stream to form a reaction zone feed stream;
- d. passing the reaction zone feed stream through a reaction zone as a vapor and thereby forming a reaction zone effluent stream;
- e. cooling and effecting a partial condensation of the reaction zone effluent stream and passing the reaction zone effluent stream into a first vapor-liquid separation zone operated at conditions effective to form a first condensate stream and a first separation zone gas stream;
- f. passing the first condensate stream into a product recovery zone;
- g. cooling and then passing the first separation zone gas stream into a second vapor-liquid separation zone operated at conditions effective to form a second condensate stream and a second separation zone gas stream;
- and,
- h. heating the second separation zone gas stream by indirect heat exchange against the first separation zone gas stream and passing the second separation zone gas stream into a lower portion of the stripping zone as the gaseous stripping media.
6 more elements
A process for catalytically reforming a naphtha which comprises the steps of:
- a. passing a feed gas stream comprising hydrogen and C.sub.2 -C.sub.4 paraffins through an absorption zone operated under conditions effective to remove C.sub.2 -C.sub.4 paraffins, including countercurrent contact with a stripping zone liquid effluent stream, and thereby forming a hydrogenrich gas stream and an absorption zone liquid effluent stream;
- b. passing the absorption zone liquid effluent stream into a stripping zone operated at conditions effective to cause the removal of C.sub.2 -C.sub.4 paraffins from absorption zone liquid effluent stream, including countercurrent contact with a gaseous stripping media, and thereby forming the stripping zone liquid effluent stream and an off-gas stream comprising hydrogen and C.sub.2 -C.sub.4 paraffins;
- c. admixing the hydrogen-rich gas stream with a naphtha feed stream to form a reaction zone feed stream;
- d. passing the reaction zone feed stream through a reaction zone as a vapor and thereby forming a reaction zone effluent stream;
- e. cooling and effecting a partial condensation of the reaction zone effluent stream and passing the reaction zone effluent stream into a first vapor-liquid separation zone operated at conditions effective to form a first condensate stream and a first separation zone gas stream;
- f. passing the first condensate stream into a product recovery zone;
- g. cooling and then passing the first separation zone gas stream into a second vapor-liquid separation zone operated at conditions effective to form a second condensate stream and a second separation zone gas stream;
- and,
- h. heating the second separation zone gas stream by indirect heat exchange against the first separation zone gas stream and passing the second separation zone gas stream into a lower portion of the stripping zone as the gaseous stripping media.
6 more elements
Dependencies are inferred from the claim text.