KR-20260066710-A - Method for purifying bromine gas

KR20260066710AKR 20260066710 AKR20260066710 AKR 20260066710AKR-20260066710-A

Abstract

The present invention provides a method for purifying bromine gas capable of selectively removing chlorine molecules from bromine gas. The method for purifying bromine gas comprises a purification process in which bromine gas is contacted with a chlorine removal agent, which has a metal bromide supported on an adsorbent, to remove chlorine molecules contained in the bromine gas from the bromine gas.

Inventors

오카 슈토
우라카와 카츠로
카가 카즈나리

Assignees

가부시끼가이샤 레조낙

Dates

Publication Date: 20260512
Application Date: 20240828
Priority Date: 20230907

Claims (6)

A method for purifying bromine gas, comprising a purification process for removing chlorine molecules contained in bromine gas by contacting bromine gas with a chlorine removal agent in which a metal bromide is supported on an adsorbent.
In Article 1, A method for purifying bromine gas, wherein the adsorbent comprises at least one of active alumina and zeolite.
In Article 1 or Article 2, A method for purifying bromine gas, wherein the specific surface area of the chlorine remover is 100 m²/g or more.
In Article 1 or Article 2, A method for purifying bromine gas, wherein the average particle size of the chlorine remover is within the range of 0.5 mm or more and 10 mm or less.
In Article 1 or Article 2, A method for purifying bromine gas, wherein the metal bromide comprises at least one of potassium bromide, sodium bromide, calcium bromide, and magnesium bromide.
In Article 1 or Article 2, A method for purifying bromine gas, wherein the content of the metal bromide in the chlorine removal agent is 1 mass% or more and 50 mass% or less.

Description

Method for purifying bromine gas The present disclosure relates to a method for purifying bromine gas. Industrially produced bromine gas ( Br₂ ) usually contains chlorine molecules ( Cl₂ ) as impurities. Therefore, methods for purifying bromine gas by removing chlorine molecules from bromine gas have been proposed. For example, Patent Document 1 proposes a halogen gas removal agent containing sulfur-containing reducing agents such as thiosulfate and similar boehmite. An embodiment of the present disclosure is described below. Furthermore, this embodiment represents an example of the present disclosure, and the present disclosure is not limited to this embodiment. Additionally, various modifications or improvements may be added to this embodiment, and forms with such modifications or improvements may also be included in the present disclosure. The method for purifying bromine gas according to the present embodiment comprises a purification process in which bromine gas is contacted with a chlorine removal agent, which has a metal bromide supported on an adsorbent, to remove chlorine molecules contained as impurities from the bromine gas. That is, the method for purifying bromine gas according to the present embodiment comprises a purification process in which bromine gas is contacted with a chlorine removal agent, which has a metal bromide supported on an adsorbent, to remove chlorine molecules from the bromine gas. With the above configuration, chlorine molecules contained in the bromine gas can be adsorbed onto the chlorine remover while suppressing the adsorption of bromine gas onto the chlorine remover, thereby making it possible to selectively adsorb and remove chlorine molecules from the bromine gas. Furthermore, since the bromine gas purification method according to the present embodiment is a simple method, the equipment cost is low and economical. [absorbent] The type of adsorbent used in the method for purifying bromine gas according to the present embodiment is not particularly limited as long as it has high adsorption capacity and an average particle size suitable for use as a raw material for a chlorine removal agent, but examples include activated alumina and zeolite (natural zeolite, synthetic zeolite). That is, the adsorbent may have at least one of activated alumina and zeolite. Furthermore, as an adsorbent, at least one of activated alumina and zeolite may be used, or at least one of activated alumina and zeolite may be used in combination with other types of adsorbents. [Metal bromide] The type of metal bromide used in the method for purifying bromine gas according to the present embodiment is not particularly limited as long as it functions as a component for fixing chlorine molecules by reacting with them, but examples include alkali metal bromides and alkaline earth metal bromides. Examples of alkali metal bromides include potassium bromide (KBr), sodium bromide (NaBr), calcium bromide ( CaBr₂ ), and magnesium bromide ( MgBr₂ ), among which potassium bromide and sodium bromide are preferred. That is, the metal bromide may have at least one of potassium bromide, sodium bromide, calcium bromide, and magnesium bromide. In addition, as a metal bromide, one of potassium bromide, sodium bromide, calcium bromide, and magnesium bromide may be used alone, or multiple of these may be used in combination. In addition, as a metal bromide, only an alkali metal bromide may be used, or an alkali metal bromide may be used in combination with other types of metal bromides. [Chlorine Remover] The chlorine removal agent in the method for purifying bromine gas according to the present embodiment is a metal bromide supported on an adsorbent (for example, a metal bromide supported on the surface of an adsorbent). By using a chlorine removal agent obtained by supporting a metal bromide on an adsorbent, selective removal of chlorine molecules is possible while suppressing the adsorption of bromine gas. In other words, if an adsorbent that does not support metal bromides is used as a chlorine remover, bromine molecules as well as chlorine molecules are adsorbed within the pores of the chlorine remover, thereby removing bromine gas. However, if a chlorine remover that supports metal bromides is used, the adsorption of bromine molecules is physically suppressed compared to an adsorbent that does not support metal bromides because the metal bromides are supported within the pores. In addition to adsorption, chlorine molecules can be selectively immobilized on the chlorine remover through chemical redox reactions. Chlorine molecules are immobilized, for example, on the surface of the chlorine remover. Furthermore, the chlorine removal agent in the bromine gas purification method according to the present embodiment has a high chlorine removal rate, defined as the ratio of the outlet concentration to the inlet concentration of chlorine molecules in the bromine gas circulated until the chlorine removal agent is broken.