Method and system for producing olefins

Patent metadata

Field	Value
Publication number	US-11014860-B2
Application number	US-201716347517-A
Country	US
Kind code	B2
Filing date	Oct 20, 2017
Priority date	Nov 3, 2016
Publication date	May 25, 2021
Grant date	May 25, 2021

Abstract

A process for producing one or more olefins is proposed in which a reaction input containing one or more paraffins is formed and in which a portion of the paraffin(s) present in the reaction input is converted by oxidative dehydrogenation into the olefin(s) to obtain a process gas, wherein the process gas contains at least the olefin(s), the unconverted paraffin(s), oxygen and carbon monoxide and wherein at least a portion of the process gas is subjected to a low temperature separation in which at an operating pressure level one or more gas fractions enriched in oxygen and carbon monoxide compared to the process gas are formed. It is provided that in the low temperature separation in the formation and/or for the conduction of the or at least one of the gas fractions one or more containers and/or one or more conduits having a burst pressure of at least ten times the operating pressure level are used and that the container or at least one of the containers via the or at least one of the conduits is connected to one or more heat exchangers, wherein a total length of the or of the at least one conduit between the or the at least one container and the heat exchanger(s) is not more than fifty times the internal diameter of said conduit. A corresponding plant (100) likewise forms part of the subject matter of the invention.

First claim

The invention claimed is:

1. Process for producing one or more olefins in which a reaction input containing one or more paraffins is formed and in which a portion of the paraffin(s) present in the reaction input is converted by oxidative dehydrogenation into the olefin(s) to obtain a process gas, wherein the process gas contains at least the olefin(s), the unconverted paraffin(s), oxygen and carbon monoxide and wherein at least a portion of the process gas is subjected to a low temperature separation in which at an operating pressure level one or more gas fractions enriched in oxygen and carbon monoxide compared to the process gas are formed, characterized in that, in the low temperature separation, in the formation of the one or more gas fractions and/or for the conduction of the one or more gas fractions, one or more containers and/or one or more conduits having a burst pressure of at least ten times the operating pressure level are used, and that the container or at least one of the containers is connected, via the conduit or at least one of the conduits, to one or more heat exchangers, wherein total length of the conduit(s) between the container(s) and the heat exchanger(s) is not more than fifty times the internal diameter of said conduit(s), wherein the burst pressure is a mechanical design pressure.

2. Process according to claim 1 , in which the heat exchanger(s), to which the or the at least one conduit whose total length between the or the at least one container and the heat exchanger(s) is not more than fifty times the internal diameter of said conduit is connected, have an explosion propagation-inhibiting configuration.

3. Process according to claim 2 , in which the explosion propagation-inhibiting configuration of the heat exchanger(s) comprises the use of a maximum slot dimension tailored to the gas fraction(s).

4. Process according to claim 2 , in which the heat exchanger(s) having an explosion propagation-inhibiting configuration have a burst pressure of at least ten times the operating pressure level.

5. Process according to claim 1 , in which in the low temperature separation in the formation and/or for the conduction of the or at least one of the gas fractions one or more further containers and/or one or more further conduits are used, wherein the container or at least one of the further containers via the or at least one of the further conduits is connected to one or more further heat exchangers, wherein a total length of the or of the at least one further conduit between the or the at least one further container and the further heat exchanger(s) is more than fifty times the internal diameter of said conduit.

6. Process according to claim 5 , in which the or the at least one further conduit whose total length between the or the at least one further container and the further heat exchanger(s) is more than fifty times the internal diameter has a burst pressure of at least fifty times the operating pressure level.

7. Process according to claim 5 , in which the or the at least one further conduit whose total length between the or the at least one further container and the further heat exchanger(s) is more than fifty times the internal diameter comprises an explosion arrester.

8. Process according to claim 1 , in which an at least partly gaseous fluid is conducted through the or at least one of the conduits and introduced into the container or at least one of the containers, wherein in the or the at least one container a liquid is separated from the fluid and the or the at least one conduit opens into the or the at least one container below a liquid level of the liquid.

9. Process according to claim 1 , in which the low temperature separation comprises the use of a rectification column comprising at least one oriented packing and/or dumped bed.

10. Process according to claim 1 , in which the low temperature separation comprises the use of a rectification column comprising at least one rectification tray which divides the total gas volume contained in the column into a plurality of gas volumes separated from one another by liquid and optionally solid internals.

11. Process according to claim 1 , in which the low temperature separation comprises multiple and stepwise cooling of the process gas, wherein after each cooling a condensate is separated from the process gas and one of the gas fractions remains and at least a portion of the gas fractions is supplied to a further cooling.

12. Process according to claim 11 , in which to separate at least one of the condensates the container or at least one of the containers is used and/or to supply at least one of the gas fractions to the further cooling the or one of the conduits is used.

13. Plant ( 100 ) for producing one or more olefins adapted for forming a reaction input containing one or more paraffins, comprising a reaction unit ( 103 ) adapted for converting by oxidative dehydrogenation a portion of the paraffin(s) present in the reaction input into the olefin(s) to obtain a process gas, wherein the process gas contains at least the olefin(s), the unconverted paraffin(s), oxygen and carbon monoxide and comprising a low temperature separation adapted for forming at an operating pressure level one or more gas fractions enriched in oxygen and carbon monoxide compared to the process gas, characterized in that in the low temperature separation for the formation and/or for the conduction of the or at least one of the gas fractions one or more containers and/or one or more conduits having a burst pressure of at least ten times the operating pressure level are provided and that the container or at least one of the containers via the or at least one of the conduits is connected to one or more heat exchangers, wherein a total length of the or of the at least one conduit between the or the at least one container and the heat exchanger(s) is not more than fifty times the internal diameter of said conduit.

14. Process according to claim 3 , in which the heat exchanger(s) having an explosion propagation-inhibiting configuration have a burst pressure of at least ten times the operating pressure level.

15. Process according to claim 2 , in which the burst pressure is a calculated burst pressure and/or a test pressure and/or a mechanical design pressure.

16. Process according to claim 3 , in which the burst pressure is a calculated burst pressure and/or a test pressure and/or a mechanical design pressure.

17. Process according to claim 4 , in which the burst pressure is a calculated burst pressure and/or a test pressure and/or a mechanical design pressure.

18. Process according to claim 6 , in which the or the at least one further conduit whose total length between the or the at least one further container and the further heat exchanger(s) is more than fifty times the internal diameter comprises an explosion arrester.

19. Process according to claim 2 , in which an at least partly gaseous fluid is conducted through the or at least one of the conduits and introduced into the container or at least one of the containers, wherein in the or the at least one container a liquid is separated from the fluid and the or the at least one conduit opens into the or the at least one container below a liquid level of the liquid.

Assignees

• Linde Ag

Inventors

• Fritz Helmut
• Zellhuber Mathieu
• Wellenhofer Anton
• Schubert Martin
• Winkler Florian

Classifications

• F25J3/0219 Primary

  Refinery gas, cracking gas, coke oven gas, gaseous mixtures containing aliphatic unsaturated CnHm or gaseous mixtures of undefined nature · CPC title

• F25J2200/80

  using integrated mass and heat exchange, i.e. non-adiabatic rectification in a reflux exchanger or dephlegmator · CPC title

• F25J2215/62

  Ethane or ethylene · CPC title

• F25J2290/90

  Details about safety operation of the installation · CPC title

• F25J3/0238

  separation of CnHm with 2 carbon atoms or more · CPC title