Production method of sulfur-modified polyacrylonitrile

Patent metadata

Field	Value
Publication number	US-12209156-B2
Application number	US-202017763839-A
Country	US
Kind code	B2
Filing date	Sep 14, 2020
Priority date	Sep 27, 2019
Publication date	Jan 28, 2025
Grant date	Jan 28, 2025

Abstract

The present invention provides a method of producing sulfur-modified polyacrylonitrile, including: a step (1) of heating polyacrylonitrile and elemental sulfur in a rotating-type heating container including a discharge pipe and a sulfur vapor recovery unit while rotating the rotating-type heating container; a step (2) of liquefying a sulfur vapor by the sulfur vapor recovery unit while discharging hydrogen sulfide generated in the heating step; and a step (3) of returning the liquefied sulfur to a mixture of the sulfur and the polyacrylonitrile of the step (1).

First claim

The invention claimed is:

1. A method of producing sulfur-modified polyacrylonitrile, comprising:
a step (1) of heating polyacrylonitrile and elemental sulfur in a rotating-type heating container comprising a discharge pipe and a sulfur vapor recovery unit while rotating the rotating-type heating container;
a step (2) of liquefying a sulfur vapor by the sulfur vapor recovery unit while discharging hydrogen sulfide generated in the heating step; and
a step (3) of returning the liquefied sulfur to a mixture of the sulfur and the polyacrylonitrile of the step (1).

2. The method of producing sulfur-modified polyacrylonitrile according to claim 1 , wherein a ratio between the polyacrylonitrile and the elemental sulfur is as follows: 100 parts by mass to 1,500 parts by mass of the elemental sulfur with respect to 100 parts by mass of the polyacrylonitrile.

3. The method of producing sulfur-modified polyacrylonitrile according to claim 1 , wherein the polyacrylonitrile and the elemental sulfur each have a particle diameter of from 1 μm to 1,000 μm in terms of an average particle diameter.

4. The method of producing sulfur-modified polyacrylonitrile according to claim 1 , wherein the polyacrylonitrile and the elemental sulfur each have a particle diameter of from 1 μm to 1,000 μm in terms of an average particle diameter.

Assignees

• Adeka Corp

Inventors

• Takenouchi Hiromi
• Akimoto Kensaku
• Kakiage Kenji
• Shinano Hirokatsu
• Yokomizo Tomofumi

Classifications

• C08F20/44 Primary

  Acrylonitrile · CPC title

• H01M4/604

  containing aliphatic main chain polymers · CPC title

• C08F20/56

  Acrylamide; Methacrylamide · CPC title

• H01M4/58

  of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title