Coil-wound heat exchanger for hydrotreatment or hydroconversion

Patent metadata

Field	Value
Publication number	US-10815436-B2
Application number	US-201816227606-A
Country	US
Kind code	B2
Filing date	Dec 20, 2018
Priority date	Dec 22, 2017
Publication date	Oct 27, 2020
Grant date	Oct 27, 2020

Abstract

The present invention relates to a device and a process for hydroconversion or hydrotreatment of a hydrocarbon feedstock, comprising in particular at least one coil-wound heat exchanger (S- 1 ), said coil-wound exchanger being a single-pass heat exchanger formed by a vertical chamber in which one or more bundles of tubes are helically wound around a central core, as numerous superposed layers, for: heating and directly distributing a hydrocarbon feedstock/hydrogen stream mixture to a hydrotreatment or hydroconversion reaction section (R- 1 ), and cooling the reaction effluent from the hydrotreatment or hydroconversion reaction section (R- 1 ). The present invention also relates to a use of a coil-wound heat exchanger (S- 1 ) in a process for hydroconversion or hydrotreatment of a hydrocarbon feedstock.

First claim

The invention claimed is:

1. A device for hydroconversion or hydrotreatment of a hydrocarbon feedstock, comprising:
at least one coil-wound heat exchanger (S- 1 ), said coil-wound exchanger being a single-pass heat exchanger formed by a vertical chamber in which one or more bundles of tubes are helically wound around a central core, as numerous superposed layers, suitable for:
heating and directly distributing the hydrocarbon feedstock and optionally a hydrogen stream or a hydrocarbon feedstock/hydrogen stream mixture to a hydrotreatment or hydroconversion reaction section (R- 1 ) forming a reaction effluent, and
cooling the reaction effluent from the hydrotreatment or hydroconversion reaction section (R- 1 ) forming a cooled reaction effluent;

a bypass ( 19 ) suitable for directly distributing a portion of the hydrocarbon feedstock or a portion of the hydrocarbon feedstock/hydrogen stream mixture from the inlet of the coil-wound heat exchanger (S- 1 ) to the outlet of the coil-wound heat exchanger (S- 1 );
the hydrotreatment or hydroconversion reaction section (R- 1 ) suitable for hydrotreating or hydroconverting the hydrocarbon feedstock;
a high-pressure cold separator (B- 2 ) suitable for separating at least one portion of the cooled reaction effluent into a first liquid effluent comprising at least one light fraction and a first gaseous effluent comprising hydrogen; and
a separation column (C- 1 ) suitable for separating the first liquid effluent comprising at least one light fraction into a bottoms liquid and an overhead effluent; or
instead of the separation column (C- 1 ) suitable for separating the first liquid effluent comprising at least one light fraction, a medium-pressure cold separator (B- 4 ) suitable for separating the first liquid effluent comprising at least one light fraction into a second liquid effluent comprising at least one light fraction distributed to the separation column (C- 1 ), and a second gaseous effluent comprising hydrogen.

2. The hydroconversion or hydrotreatment device according to claim 1 , comprising a single coil-wound heat exchanger (S- 1 ).

3. The hydroconversion or hydrotreatment device according to claim 1 , further comprising a high-pressure hot separator (B- 1 ) suitable for separating the cooled reaction effluent into a first liquid effluent comprising at least one heavy fraction and a first gaseous effluent comprising a light fraction distributed to the high-pressure cold separator (B- 2 ).

4. The hydroconversion or hydrotreatment device according to claim 3 , further comprising a medium-pressure hot separator (B- 3 ) suitable for separating the first liquid effluent comprising at least one heavy fraction into a second liquid effluent comprising at least one heavy fraction distributed to the separation column (C- 1 ), and a second gaseous effluent comprising a light fraction.

5. The hydroconversion or hydrotreatment device according to claim 4 , further comprising a medium-pressure cold separator (B- 4 ) suitable for separating the first liquid effluent comprising at least one light fraction into a second liquid effluent comprising at least one light fraction distributed to the separation column (C- 1 ), and a second gaseous effluent comprising hydrogen.

6. The hydroconversion or hydrotreatment device according to claim 5 , in which the medium-pressure cold separator (B- 4 ) is suitable for separating the second gaseous effluent comprising a light fraction.

7. The hydroconversion or hydrotreatment device according to claim 1 , further comprising a medium-pressure cold separator (B- 4 ) suitable for separating the first liquid effluent comprising at least one light fraction into a second liquid effluent comprising at least one light fraction distributed to the separation column (C- 1 ), and a second gaseous effluent comprising hydrogen.

8. A process for hydroconversion or hydrotreatment of a hydrocarbon feedstock, comprising the following steps:
heating and directly distributing a portion I of the hydrocarbon feedstock and optionally a hydrogen stream or a portion I′ of a hydrocarbon feedstock/hydrogen stream mixture to a hydrotreatment or hydroconversion reaction section (R- 1 ) by at least one coil-wound heat exchanger (S- 1 ) forming a reaction effluent;
directly distributing a portion II of the hydrocarbon feedstock or a portion II′ of the hydrocarbon feedstock/hydrogen stream mixture from the inlet of the coil-wound heat exchanger (S- 1 ) to the outlet of the coil-wound heat exchanger (S- 1 ) through a bypass ( 19 );
mixing the hydrocarbon feedstock with the hydrogen stream, said mixing taking place before or after the heating step;
cooling the reaction effluent from the hydrotreatment or hydroconversion reaction section (R- 1 ) by the at least one coil-wound heat exchanger (S- 1 ) forming a cooled reaction effluent, said coil-wound exchanger being a single-pass heat exchanger formed by a vertical chamber in which one or more bundles of tubes are helically wound around a central core, as numerous superposed layers;
hydrotreating or hydroconverting the hydrocarbon feedstock in the hydrotreatment or hydroconversion reaction section (R- 1 ) comprising at least one reactor comprising at least one catalyst comprising at least one element chosen from elements from Group VIII of the Periodic Table;
separating at least one portion of the cooled reaction effluent in a high-pressure cold separator (B- 2 ) in order to distribute a first liquid effluent comprising at least one light fraction and a first gaseous effluent comprising hydrogen; and
separating the first liquid effluent comprising at least one light fraction in a separation column (C- 1 ) in order to distribute a bottoms liquid and an overhead effluent; or
instead of separating the first liquid effluent comprising at least one light fraction in column (C- 1 ), separating the first liquid effluent comprising at least one light fraction in a medium-pressure cold separator (B- 4 ) into a second liquid effluent comprising at least one light fraction distributed to the separation column (C- 1 ), and a second gaseous effluent comprising hydrogen.

9. The hydroconversion or hydrotreatment process according to claim 8 , in which the hydrotreatment or hydroconversion of the hydrocarbon feedstock is carried out with at least one of the following operating conditions:
the temperature is between around 200° C. and around 460° C.;
the total pressure is between around 1 MPa and around 20 MPa;
the overall hourly space velocity of liquid feedstock is between around 0.05 h −1 and around 12 −1 ;
the hydrogen stream comprises between around 50 vol % and around 100 vol % of hydrogen relative to the volume of the hydrogen stream;
the amount of hydrogen relative to the liquid hydrocarbon feedstock is between around 50 Nm 3 /m 3 and around 2500 Nm 3 /m 3 .

10. The hydroconversion or hydrotreatment process according to claim 8 , in which the hydrocarbon feedstock comprises an initial boiling point of greater than 120° C.

11. The hydroconversion or hydrotreatment process according to claim 8 , in which:
the hydrocarbon feedstock comprises at least 5% by weight of cracked feedstocks originating from visbreaking, coking, or fluid catalytic cracking relative to the weight of the hydrocarbon feedstock; or
the hydrocarbon feedstock comprises less than 5% by weight of cracked feedstocks relative to the weight of the hydrocarbon feedstock, and in which a temperature rise of greater than 15° C. is implemented between the inlet and the outlet of the hydrotreatment or hydroconversion reaction section (R- 1 ).

12. The hydroconversion or hydrotreatment process according to claim 8 , in which th

Assignees

• Axens

Inventors

• Silberstein Claire
• Lajeunesse Odile
• Rault Jacques
• Gagniere Marielle

Classifications

• F28D9/04

  the conduits being formed by spirally-wound plates or laminae · CPC title

• F28D7/02

  the conduits being helically coiled (F28D7/10 takes precedence {F28D7/0016 and F28D7/0033 take precedence}) · CPC title

• C10G47/00

  Cracking of hydrocarbon oils, in the presence of hydrogen or hydrogen- generating compounds, to obtain lower boiling fractions (C10G15/00 takes precedence; destructive hydrogenation of non-melting solid carbonaceous or similar materials C10G1/06) · CPC title

• B01J8/06

  in tube reactors; the solid particles being arranged in tubes · CPC title

• C10G2300/4006

  Temperature · CPC title