Alkene generation using metal sulfide particles

Patent metadata

Field	Value
Publication number	US-2023009840-A1
Application number	US-202217952748-A
Country	US
Kind code	A1
Filing date	Sep 26, 2022
Priority date	Apr 9, 2019
Publication date	Jan 12, 2023
Grant date	—

Abstract

Systems and methods include providing a gaseous alkane input stream and metal sulfide (MSx) particles that can react with an alkane in the gaseous alkane input stream to generate an alkene, a reduced metal sulfide (MSx-1) particle, and at least one of: hydrogen sulfide (H2S) and at least one sulfur containing compound selected from: S2, CS, and CS2. A product stream can be collected that includes the alkene and at least one of: hydrogen sulfide (H2S) and the at least one sulfur containing compound. A reduced metal sulfide (MSx-1) particle reacts with sulfur in a sulfur stream and can generate the metal sulfide (MSx) particle and hydrogen (H2).

First claim

1 . - 20 . (canceled)

21 . A system, comprising:
an alkane source; a first reactor comprising:
an alkane inlet in fluid communication with the alkane source;
an oxidized particle inlet configured to receive a metal sulfide (MS x ) particle;
a reduced particle outlet configured to discharge a reduced metal sulfide (MS x-1 ) particle; and
a first reactor product outlet configured to provide an alkene and hydrogen sulfide (H 2 S);
a sulfur source; a second reactor comprising:
a sulfur inlet in fluid communication with the sulfur source;
a reduced particle inlet in fluid communication with the reduced particle outlet of the first reactor;
an oxidized particle outlet in fluid communication with the oxidized particle inlet of the first reactor; and
a second reactor product outlet configured to provide hydrogen (H 2 ); and
a separation unit in fluid communication with the first reactor product outlet, the separation unit comprising:
a hydrogen sulfide (H 2 S) outlet in fluid communication with the sulfur inlet of the second reactor; and
an alkene outlet configured to provide an alkene stream.

22 . The system according to claim 21 , wherein the second reactor product outlet is configured to provide hydrogen sulfide (H 2 S); and
further comprising a second separation unit in fluid communication with the second reactor product outlet, the second separation unit comprising: a hydrogen sulfide (H 2 S) outlet in fluid communication with the sulfur inlet of the second reactor; and a hydrogen (H 2 ) outlet.

23 . The system according to claim 21 , wherein the first reactor is configured as a moving bed.

24 . The system according to claim 21 , wherein the second reactor is configured as a moving bed.

25 . The system according to claim 21 , wherein the first reactor is configured as a fluidized bed.

26 . The system according to claim 21 , wherein the second reactor is configured as a fluidized bed.

27 . The system according to claim 21 , wherein a metal (M) in the metal sulfide (MS x ) particle includes iron (Fe), cobalt (Co), nickel (Ni), copper (Cu), tungsten (W), lanthanum (La), cerium (Ce), titanium (Ti), zinc (Zn), cadmium (Cd), ruthenium (Ru), rhodium (Rh) or lead (Pb).

28 . The system according to claim 27 , wherein the metal sulfide (MS x ) particle comprises at least two metals.

29 . The system according to claim 27 , wherein the metal sulfide (MS x ) particle has a size of 100 µm to 2 mm; and
wherein the metal sulfide (MS x ) particle has density of 1.5 g/cm 3 to 6 g/cm 3 .

30 . The system according to claim 21 , further comprising a monitoring unit in fluid communication with the first reactor product outlet, the monitoring unit being configured to:
determine a conversion rate of alkanes in the first reactor; and adjust a flow rate from the alkane source based on the determined conversion rate.

31 . The system according to claim 30 , wherein the sulfur source is configured to adjust a flow rate of sulfur to the second reactor based on conversion data for the second reactor product outlet.

32 . The system according to claim 21 , wherein the metal sulfide (MS x ) particle includes a promotor, dopant, or support selected from: MoS 2 , Ce 2 S 3 , MgS, Na 2 S, K 2 O, MgO, SiO 2 , Al 2 O 3 , and MgAl 2 O 4 .

33 . The system according to claim 21 , wherein the metal sulfide (MS x ) particle includes a mesoporous support selected from: Santa Barbara Amorphous-15 silica (SBA-15), Santa Barbara Amorphous-16 silica (SBA-16), Mesoporous Al 2 O 3 , and Mesoporous CeO 2 .

34 . A system, comprising:
an alkane source comprising an alkane source outlet in fluid communication with an alkane flow regulation unit; an inert gas source comprising an inert gas source outlet in fluid communication with an inert gas flow regulation unit; a sulfur source comprising a sulfur source outlet in fluid communication with a sulfur flow regulation unit; a reactor comprising a reactor inlet and a reactor outlet,
the reactor being configured to operate as a fixed bed reactor;
the reactor being in fluid communication with the alkane flow regulation unit, the inert gas flow regulation unit, and the sulfur flow regulation unit;
the reactor comprising a plurality of metal sulfide (MS x ) particles; and a gas analyzer unit in fluid communication with the reactor outlet and configured to:
determine an alkane conversion;
compare the alkane conversion to a threshold value; and
when the alkane conversion equals the threshold value, send a signal to stop flow from the alkane flow regulation unit.

35 . The system according to claim 34 , wherein the metal sulfide (MS x ) particle comprises at least two metals.

36 . The system according to claim 35 , wherein the metal sulfide (MS x ) particle has a size of 100 µm to 2 mm; and
wherein the metal sulfide (MS x ) particle has density of 1.5 g/cm 3 to 6 g/cm 3 .

37 . The system according to claim 36 , wherein the gas analyzer unit is further configured to:
detect, during a purge cycle, a content of at least one of: alkane, hydrogen sulfide, and alkene gas in a reactor product outlet stream; and upon detecting that most of the reactor product outlet stream comprises inert gas, stop a flow of the inert gas from the inert gas flow regulation unit.

38 . The system according to claim 37 , wherein the sulfur flow regulation unit is configured to provide sulfur to the reactor after the flow of the inert gas to the reactor stops.

39 . The system according to claim 38 , a metal (M) in the metal sulfide (MS x ) particle includes iron (Fe), cobalt (Co), nickel (Ni), copper (Cu), tungsten (W), lanthanum (La), cerium (Ce), titanium (Ti), zinc (Zn), cadmium (Cd), ruthenium (Ru), rhodium (Rh) or lead (Pb).

40 . The system according to claim 39 , wherein the metal sulfide (MS x ) particle includes a promotor, dopant, or support selected from: MoS 2 , Ce 2 S 3 , MgS, Na 2 S, K 2 O, MgO, SiO 2 , Al 2 O 3 , and MgAl 2 O 4 .

Assignees

• Ohio State Innovation Foundation

Inventors

• Fan Liang-Shih
• Baser Deven
• Nadgouda Sourabh
• Joshi Anuj
• Mohapatra Pinak

Classifications

• C07C5/46 Primary

  with sulfur or a sulfur-containing compound as an acceptor · CPC title

• C07C2527/043

  with iron group metals or platinum group metals · CPC title

• C07C5/48

  with oxygen as an acceptor · CPC title

• C07C2527/04

  Sulfides · CPC title

• Y02P20/52

  using catalysts, e.g. selective catalysts · CPC title