Producing system of reduction product

Patent metadata

Field	Value
Publication number	US-10465303-B2
Application number	US-201615261030-A
Country	US
Kind code	B2
Filing date	Sep 9, 2016
Priority date	Sep 15, 2015
Publication date	Nov 5, 2019
Grant date	Nov 5, 2019

Abstract

A producing system of reduction product of carbon dioxide includes a chemical reaction apparatus including an oxidation reaction electrolytic bath and a reduction reaction electrolytic bath, the chemical reaction apparatus configured to generate a reduction product by reducing carbon dioxide, an electrolytic solution supply unit supplying an electrolytic solution to the reduction reaction electrolytic bath, a carbon dioxide supply unit configured to dissolve carbon dioxide into the electrolytic solution, the carbon dioxide supply unit serving to sustain a reduction reaction in the reduction reaction electrolytic bath, and a separation unit configured to separate the reduction product from the electrolytic solution.

First claim

What is claimed is:

1. A producing system of a reduction product of carbon dioxide, comprising:
a chemical reaction apparatus comprising an oxidation reaction electrolytic bath provided with an oxidation catalyst and a reduction reaction electrolytic bath provided with a reduction catalyst, the chemical reaction apparatus configured to generate a reduction product by reducing carbon dioxide;
an electrolytic solution supply unit supplying an electrolytic solution to the reduction reaction electrolytic bath;
a carbon dioxide supply unit configured to dissolve carbon dioxide into the electrolytic solution, the carbon dioxide supply unit serving to sustain a reduction reaction in the reduction reaction electrolytic bath such that a concentration of the reduction product in the electrolytic solution is increased; and
a separation unit configured to separate the reduction product from the electrolytic solution in which the concentration of the reduction product is increased,
wherein the separation unit comprises an extractor configured to extract the reduction product and the carbon dioxide from the electrolytic solution having increased concentration of the reduction product into an ionic liquid as an extraction solvent, a carbon dioxide separation column configured to separate the carbon dioxide from the ionic liquid containing the reduction product and the carbon dioxide extracted by the extractor, and a rectifying column configured to separate the reduction product from the ionic liquid from which the carbon dioxide has been separated by the carbon dioxide separation column.

2. The system according to claim 1 , wherein the electrolytic solution supply unit comprises a storage tank storing the electrolytic solution, a first pipe serving to supply the electrolytic solution from the storage tank to the reduction reaction electrolytic bath, and a second pipe serving to discharge the electrolytic solution from the reduction reaction electrolytic bath and return the electrolytic solution to the storage tank, and wherein at least one of the storage tank, the first pipe, and the second pipe is provided with the carbon dioxide supply unit.

3. The system according to claim 1 , wherein the extraction solvent comprises, as the ionic liquid, at least one type of compound comprising an organic cation selected from an alkyl ammonium cation, a pyridinium cation, a piperidinium cation, a pyrrolidinium cation, an imidazolium cation, and an alkyl phosphonium cation.

4. The system according to claim 1 , wherein the rectifying column comprises a first rectifying column configured to separate methanol, a second rectifying column configured to separate ethanol, and a third rectifying column configured to separate ethylene glycol, from the ionic liquid from which the carbon dioxide has been separated.

5. The system according to claim 1 , further comprising a pipe serving to feed the ionic liquid from which the reduction product has been separated by the rectifying column from the rectifying column to the extractor.

6. The system according to claim 1 , further comprising: a preparation tank serving to prepare an electrolytic solution to which the carbon dioxide is dissolved using the electrolytic solution, from which the reduction product and the carbon dioxide have been separated by the extractor, and the carbon dioxide separated by the carbon dioxide separation column; and a pipe serving to feed the electrolytic solution prepared in the preparation tank from the preparation tank to the electrolytic solution supply unit.

7. The system according to claim 1 , wherein the chemical reaction apparatus further comprises a power source element connected to an oxidation catalyst layer comprising the oxidation catalyst and a reduction catalyst layer comprising the reduction catalyst.

8. The system according to claim 1 ,
wherein the reduction catalyst comprises:
a current collector having a metal layer on a surface thereof; and
a modifying organic molecule containing a quaternary nitrogen cation, the modifying organic molecule bonded to a surface of the metal layer.

9. The system according to claim 8 , wherein the modifying organic molecule comprises at least one type of quaternary nitrogen anion selected from an alkyl ammonium cation, a pyridinium cation, a piperidinium cation, and an imidazolium cation.

10. The system according to claim 1 ,
wherein the reduction catalyst comprises:
a current collector having a surface layer,
a spacer organic molecule layer formed on the surface layer, and
metal particles bonded to a surface of the spacer organic molecule layer.

11. The system according to claim 10 , further comprising a modifying organic molecule containing a quaternary nitrogen cation, the modifying organic molecule bonded to a surface of the metal particles.

12. The system according to claim 11 , wherein the modifying organic molecule comprises at least one type of quaternary nitrogen anion selected from an alkyl ammonium cation, a pyridinium cation, a piperidinium cation, and an imidazolium cation.

Assignees

• Toshiba Kk

Inventors

• Tamura Jun
• Mikoshiba Satoshi
• Kudo Yuki
• Ono Akihiko
• Kitagawa Ryota
• Yamagiwa Masakazu
• Sugano Yoshitsune

Classifications

• B01D3/009

  in combination with chemical reactions · CPC title

• B01D3/143

  by two or more of a fractionation, separation or rectification step · CPC title

• C25B15/08 Primary

  Supplying or removing reactants or electrolytes; Regeneration of electrolytes · CPC title

• B01D11/0488

  Flow sheets · CPC title

• B01D11/0492

  Applications, solvents used · CPC title