Process that can withstand high currents, for producing ammonia

Patent metadata

Field	Value
Publication number	US-2021285113-A1
Application number	US-201917255698-A
Country	US
Kind code	A1
Filing date	Jun 24, 2019
Priority date	Jun 25, 2018
Publication date	Sep 16, 2021
Grant date	—

Abstract

A process for producing ammonia and an apparatus for producing ammonia are disclosed herein. The process includes: the electrolytic production of a metal at a cathode of an electrolysis cell, wherein the metal is selected from Li, Mg, Ca, Sr, Ba, Zn, Al and/or alloys and/or mixtures thereof; production of a nitride of the metal M by reaction of the electrolytically produced metal with a gas including nitrogen; introduction of the nitride of the metal M into the electrolysis cell (e.g., into an anode chamber of the electrolysis cell); and reaction of the nitride of the metal M at an anode of the electrolysis cell to produce ammonia.

First claim

1 . A process for preparing ammonia, the process comprising:
electrolytically preparing a metal at a cathode of an electrolysis cell, wherein the metal is selected from the group consisting of Li, Mg, Ca, Sr, Ba, Zn, Al, alloys thereof, and mixtures thereof; preparing a nitride of the metal by reacting the electrolytically prepared metal with a gas comprising nitrogen; introducing the nitride of the metal into the electrolysis cell; and converting the nitride of the metal to ammonia at an anode of the electrolysis cell.

2 . The process of claim 1 , wherein the electrolyte in the electrolysis cell comprises one or more of a salt melt, an ionic liquid, or a solution of salts in an organic solvent.

3 . The process of claim 1 , wherein the nitride of the metal is prepared by combusting the metal in the gas comprising nitrogen.

4 . The process of claim 3 , wherein the electrolytic preparation of the metal is effected by depositing the metal at the cathode and the metal is separated from the cathode before the metal is reacted with the gas comprising nitrogen.

5 . The process of claim 4 , wherein the metal is separated off in liquid form.

6 . The process of claim 5 , wherein the cathode is in porous form and the metal is drawn off in an interior of an electrode.

7 . The process of claim 1 , wherein the anode is a hydrogen-depolarized electrode.

8 . The process of claim 1 , wherein energy generated in the reaction of the metal with the nitrogen is used to generate power and/or raise steam.

9 . An apparatus for preparation of ammonia, the apparatus comprising:
an electrolysis cell comprising:
a cathode space comprising a cathode configured to electrolytically prepare a metal, wherein the metal is selected from the group consisting of Li, Mg, Ca, Sr, Ba, Zn, Al, alloys thereof, and mixtures thereof;
a separation apparatus configured to separate the metal from the cathode;
a first removal apparatus for the metal which is connected to the cathode space and configured to remove the metal from the electrolysis cell;
a second feed device for a nitride of the metal M, which is configured to feed a nitride of the metal to the electrolysis cell;
an anode space comprising an anode, wherein the anode is configured to prepare ammonia from the nitride of the metal; and
a preparation apparatus for preparation of a nitride of the metal by reacting the electrolytically prepared metal with a gas comprising nitrogen, the preparation apparatus comprising:
a conversion apparatus configured to react the metal with the gas comprising nitrogen;
a feed device for the metal, wherein the feed device is configured to feed the metal to the conversion apparatus for conversion of the metal M; and
a removal device for a nitride of the metal,
wherein the removal device is configured to remove a nitride of the metal from the conversion apparatus.

10 . The apparatus of claim 9 , wherein the conversion apparatus for reacting the metal with the gas comprising nitrogen comprises a combustion apparatus configured to combust the metal.

11 . The apparatus of claim 9 , wherein the cathode is in porous form.

12 . The apparatus of claim 9 , wherein the anode is a hydrogen-depolarized electrode.

13 . The apparatus of claim 9 , further comprising:
a heating device configured to heat an electrolyte in the electrolysis cell.

14 . The apparatus of claim 9 , wherein the removal device for the metal is configured to remove the metal as a floating liquid.

15 . The apparatus of claim 9 , wherein the removal device for the metal is configured to remove the metal M in liquid form from a base of the electrolysis cell.

16 . The apparatus of claim 13 , wherein the heating device is configured to heat the electrolyte to a temperature above a melting point of the metal.

17 . The process of claim 1 , wherein the nitride of the metal is introduced into an anode space of the electrolysis cell.

18 . The process of claim 1 , wherein the electrolytic preparation of the metal is effected by depositing the metal at the cathode and the metal is separated from the cathode before the metal is reacted with the gas comprising nitrogen.

19 . The process of claim 18 , wherein the metal is separated off in liquid form.

20 . The process of claim 19 , wherein the cathode is in porous form and the metal is drawn off in an interior of an electrode.

Assignees

• Siemens Ag

Inventors

• Schmid Bernhard
• Schmid Günter
• Reller Christian
• Taroata Dan

Classifications

• C01B21/06 Primary

  Binary compounds of nitrogen with metals, with silicon, or with boron, {or with carbon, i.e. nitrides; Compounds of nitrogen with more than one metal, silicon or boron}(azides C01B21/08) · CPC title

• C01C1/026

  Preparation of ammonia from inorganic compounds · CPC title

• C01B21/0722

  Preparation by direct nitridation of aluminium · CPC title

• C25C1/02

  of light metals · CPC title

• C25C7/00

  Constructional parts, or assemblies thereof, of cells; Servicing or operating of cells (for the production of aluminium C25C3/06 - C25C3/22) · CPC title