Method for stopping ammoxidation reaction

Patent metadata

Field	Value
Publication number	US-9346747-B2
Application number	US-201314430714-A
Country	US
Kind code	B2
Filing date	Sep 13, 2013
Priority date	Oct 1, 2012
Publication date	May 24, 2016
Grant date	May 24, 2016

Abstract

An object of the present invention is to provide a method for, when stopping an ammoxidation reaction of propane, stopping the ammoxidation reaction safely and quickly, without causing a deterioration in catalytic activity or acrylonitrile yield. The method for stopping an ammoxidation reaction includes a supply stopping step of stopping a supply of propane, an oxygen-containing gas, and ammonia to a reactor where an ammoxidation reaction of propane is being carried out using a catalyst, and a reaction stopping step of supplying an inert gas to the reactor in an amount 10 to 300 times the catalyst volume per hour until the catalyst temperature reaches 380° C. or less, wherein after the supply stopping step, a time required until the catalyst temperature decreases to 360° C. or less is within 10 hours.

First claim

The invention claimed is:

1. A method for stopping an ammoxidation reaction comprising:
a supply stopping step of stopping a supply of propane, an oxygen-containing gas, and ammonia to a reactor where an ammoxidation reaction of propane is being carried out using a catalyst comprising Mo, V, Nb, and Sb; and
a reaction stopping step of supplying an inert gas to the reactor in an amount 10 to 300 times the catalyst volume per hour until a catalyst temperature reaches 380° C. or less,
wherein after the supply stopping step, a time required until the catalyst temperature decreases to 360° C. or less is within 10 hours.

2. A method for producing an acrylonitrile comprising:
a supply stopping step of stopping a supply of propane, an oxygen-containing gas, and ammonia to a reactor where an ammoxidation reaction of propane is being carried out using a catalyst comprising Mo, V, Nb, and Sb; and
a reaction stopping step of supplying an inert gas to the reactor in an amount 10 to 300 times the catalyst volume per hour until a catalyst temperature reaches 380° C. or less,
wherein after the supply stopping step, a time required until the catalyst temperature decreases to 360° C. or less is within 10 hours.

Assignees

• Asahi Kasei Chemicals Corp

Inventors

• Tamura Sho
• Shoji Sadao

Classifications

• C07C255/08

  Acrylonitrile; Methacrylonitrile · CPC title

• C07C253/24 Primary

  by ammoxidation of hydrocarbons or substituted hydrocarbons · CPC title

• Y02P20/52

  using catalysts, e.g. selective catalysts · CPC title