Method for removing catalyst used in reaction

Patent metadata

Field	Value
Publication number	US-9896401-B2
Application number	US-201515538679-A
Country	US
Kind code	B2
Filing date	Dec 2, 2015
Priority date	Dec 24, 2014
Publication date	Feb 20, 2018
Grant date	Feb 20, 2018

Abstract

Provided is a method for easily and safely removing, from a reactor, a catalyst used in a reaction that is performed using hydrogen fluoride in the presence of the catalyst. In a reaction performed in a reactor containing at least hydrogen fluoride and a catalyst, the catalyst is removed through a process comprising a heating step of performing heat-treatment so that the ambient temperature of the reactor is 80° C. or more after completion of the reaction, and a purge step of flowing inert gas into the reactor to discharge the hydrogen fluoride to the outside of the reactor after completion of the reaction.

First claim

The invention claimed is:

1. A method for removing a catalyst used in a reaction performed in a reactor containing at least hydrogen fluoride and the catalyst, wherein the catalyst is removed through a process comprising:
a heating step of performing heat-treatment so that the ambient temperature of the reactor is 80° C. or more after completion of the reaction; and
a purge step of flowing inert gas into the reactor to discharge the hydrogen fluoride to the outside of the reactor after completion of the reaction.

2. The method for removing a catalyst according to claim 1 , wherein the reaction is vapor-phase fluorination, and a reaction product of the reaction is halogenated hydrocarbon having at least a fluorine group.

3. The method for removing a catalyst according to claim 1 , wherein the heat-treatment in the heating step is performed so that T 2 ≧T 1 −100, wherein T 1 (° C.) represents the reaction temperature of the reaction, and T 2 (° C.) represents the ambient temperature.

4. The method for removing a catalyst according to claim 3 , wherein heating is performed so that T 2 ≧T 1 .

5. The method for removing a catalyst according to claim 1 , wherein the ambient temperature is 500° C. or less.

6. The method for removing a catalyst according to claim 1 , wherein the inert gas has a moisture content of less than 1000 ppm based on the total amount of the inert gas.

7. The method for removing a catalyst according to claim 1 , wherein the catalyst is at least one member selected from the group consisting of compounds containing a metal, mixtures containing a metal and activated carbon, and mixtures containing activated carbon and a compound containing a metal.

8. The method for removing a catalyst according to claim 7 , wherein the metal is at least one member selected from the group consisting of chromium, titanium, aluminum, manganese, nickel, cobalt, iron, copper, zinc, tin, gold, silver, platinum, palladium, ruthenium, rhodium, molybdenum, zirconium, germanium, niobium, tantalum, iridium, hafnium, vanadium, magnesium, lithium, sodium, potassium, calcium, cesium, rubidium, and antimony.

Assignees

• Daikin Ind Ltd

Inventors

• Nishiumi Masami
• Karube Daisuke

Classifications

• Y02P20/584

  Recycling of catalysts · CPC title

• C07C17/38 Primary

  Separation; Purification; Stabilisation; Use of additives · CPC title

• C07C17/20

  of halogen atoms by other halogen atoms · CPC title

• B01J23/26 Primary

  Chromium · CPC title

• B01J38/02

  Heat treatment · CPC title