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Hydrogen-assisted electrolysis processes

a technology of hydrogen-assisted electrolysis and alkali metal, which is applied in the direction of electrolysis components, instruments, optics, etc., can solve the problems of high market price of sodium, high energy consumption, and dominant cost, and achieves efficient and cost-effective processes, reduce cell potential, and reduce cell potential

Inactive Publication Date: 2006-08-03
XU JIANGUO +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0013] The invention is directed to process and apparatus for reducing in an electrolytic cell any ionic alkali metal compound by utilizing hydrogen or a hydrogen-containing gas. In accordance with one embodiment of this invention the hydrogen gas can be provided at the anode to reduce cell potential or at both the anode and cathode to reduce cell potential and provide source hydrogen for the formation of the reduction product, thereby achieving an efficient and cost-effective process.
[0015] In accordance with one aspect of this invention hydrogen or hydrogen-containing gas is utilized at the anode electrode for reducing in an electrolytic cell any ionic alkali metal compound. In accordance with this first aspect of this invention, the ionic alkali metal compound is electrolytically reduced to a reduced form of this alkali metal compound in an electrolytic cell which contains anode and cathode compartments This reduction is carried out by supplying to the cell the alkali metal compound to be reduced and applying electric voltage to said cell to reduce the alkali metal compound at the cathode. This aspect of the invention is carried out by passing hydrogen or a hydrogen containing gas to the anode compartment or at both the anode and cathode compartments while said compound is reduced at the cathode. In this embodiment a molten alkali metal compound is supplied to at least the cathodic compartment or to both the cathodic and anodic compartments with at least the cathodic compartment being substantially free of water. The anodic and cathodic compartments are separated by a membrane which is permeable to alkali metal ions but is not permeable to water and water vapor. In accordance with this aspect of the invention, the electrochemical processes for reducing ionic alkali metal containing compounds, particularly sodium hydroxide where sodium metal is desired, can be effectively and efficiently carried out at lower voltages. In accordance with this aspect of the invention, the use of hydrogen gas at the anode or at both the anode or cathode to assist electrolysis, provides an economic method, utilizing inexpensive materials, for generating alkali metals such as sodium and reduced alkali metal compounds such as sodium hydride and sodium borohydride.

Problems solved by technology

Energy consumption is a very important cost of production, and in many larger scale electrochemical manufacturing processes, it is the dominant cost.
Due to this, the market price of sodium is quite high and this raises the cost of raw materials for making sodium borohydride.
The cost of running several steps also adds significantly to the total manufacturing cost.

Method used

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Examples

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example 1

Hydrogen-Assisted Electrolysis Applied to Electrolysis of molten sodium Hydroxide to Make Sodium

[0064] The electrochemical cell was contained in a nickel crucible. The crucible was submerged into sand at the bottom of a glass jar. The glass jar was closed with an airtight seal. The jar was placed in a heating mantle for heating and drying the NaOH, and then to maintain the cell at the desired reaction temperatures. The crucible was loaded with NaOH and dried under flowing N2 gas at 460° C. overnight. A nickel frit electrode was used on the anode side, while a nickel wire electrode was used on the cathode side. Both electrodes have connectors for connecting to the electrical power source. After drying, the crucible and its contents were cooled to 340° C., a temperature at which they were maintained throughout the duration of the synthesis.

[0065] The top of the jar has ports that can be used to introduce electrodes, gas inlets and outlets, and a thermocouple. A reference electrode w...

example 2

Hydrogen-Assisted Electrolysis Applied to Sodium Metaborate Dissolved in Molten Sodium Hydroxide to Make Sodium Borohydride

[0068] The electrochemical cell will be contained in a nickel crucible. The crucible will be submerged into sand at the bottom of a glass jar. The glass jar will be closed with an airtight seal. The jar is to be placed in a heating mantle for heating and drying the NaOH and NaOH / NaBO2 mixtures, and then to maintain the cell at the desired reaction temperatures. The crucible will be loaded with NaOH and dried under flowing N2 gas at 460° C. overnight. A nickel frit electrode will be used on both the anode and cathode side. Both electrodes have connectors for connecting to the electrical power source. After drying, the crucible and its contents were cooled to 340° C., a temperature at which they were maintained throughout the duration of the synthesis.

[0069] The top of the jar has ports that can be used to introduce electrodes, gas inlets and outlets, and a ther...

example 3

Hydrogen-Assisted Electrolysis Applied to Sodium Hydroxide Electrolysis in Aqueous Solution to Form Sodium Amalgam

[0073] The electrolytic cell is contained in a crucible which is placed in a glass jar that can be closed with an airtight seal. The crucible will be loaded with an aqueous solution of NaOH. A platinum electrode will be used as the anode. A 2:1:1 mixture of Bi / Pb / Sn mixture (Rose's metal) will be added to the cell to act as the cathode and the alloying material. The platinum electrode should not be in contact with the alloy or the cell body. Both electrodes have connectors for connecting to the electrical power source. The top of the jar has sealable ports that can be used to introduce electrodes, gas inlets and outlets, and a thermocouple. The crucible will be used as a pseudo reference electrode.

[0074] The temperature of the cell will be raised gradually by the heating mantle, until the Rose's metal is melted. The output of the heating mantle will be controlled by a ...

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Abstract

A process and electrolytic cell for reducing in an ionic alkali metal compound, the cell containing anode and cathode electrodes, by supplying an electrolyte containing the alkali metal compound to the cell, applying an electric voltage to the cell to reduce said alkali metal compound at the cathode, and passing hydrogen or a hydrogen containing gas to at least one electrode while the compound is reduced at the cathode.

Description

CROSS REFERENCE TO RELATED APPLICATIONS [0001] This Application claims priority of U.S. Ser. No. 60 / 364,643, filed Mar. 15, 2002, U.S. Ser. No. 60 / 380,384, filed May 14, 2002 and U.S. Ser. No. 60 / 405,558, filed Aug. 23, 2002 incorporated herein by reference.FIELD OF INVENTION [0002] The field of this invention is directed to electrochemical reduction of alkali metal containing inorganic compounds by hydrogen-assisted electrolysis, with applications to alkali metal, alkali metal hydride, and alkali metal borohydride production. BACKGROUND OF THE INVENTION [0003] Electrochemical processes are important in the chemical industry, but they are also large consumers of energy. For example, the electrochemical production of inorganic chemicals and metals in the United States consumes about 5% of all the electricity generated annually, and about 16% of the electric power consumed by industry. Energy consumption is a very important cost of production, and in many larger scale electrochemical ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C25C3/02C25B1/14C25C1/04
CPCC25B1/14C25C1/04C25C3/02
Inventor XU, JIANGUOKELLY, MICHAELPEZ, GUIDOWU, YINGSHARP-GOLDMAN, STEFANIE
Owner XU JIANGUO
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