Method for producing catalyst and method for producing unsaturated nitrile

Patent metadata

Field	Value
Publication number	US-11446643-B2
Application number	US-201816630771-A
Country	US
Kind code	B2
Filing date	Jun 18, 2018
Priority date	Jul 14, 2017
Publication date	Sep 20, 2022
Grant date	Sep 20, 2022

Abstract

A method for producing a catalyst, including a slurry preparation step of preparing a slurry comprising a Mo compound, an Fe compound, a Bi compound, and an additive having a decomposition temperature of 500° C. or less; a drying step of drying the slurry to obtain a dried material; and a calcination step of calcining the dried material to obtain a calcined material, wherein the calcination step comprises a step of raising temperature of a calcination atmosphere to a predetermined temperature, and a temperature raising rate is 10° C./min or less at least at a temperature equal to or lower than the decomposition temperature of the additive.

First claim

The invention claimed is:

1. A method for producing a catalyst, comprising:
a slurry preparation step of preparing a slurry comprising a Mo compound, an Fe compound, a Bi compound, and an additive having a decomposition temperature of 500° C. or less;
a drying step of drying the slurry to obtain a dried material; and
a calcination step of calcining the dried material to obtain a calcined material,
wherein the calcination step comprises a step of raising temperature of a calcination atmosphere to a predetermined temperature, and a temperature raising rate is 10° C./min or less during a temperature of a calcination atmosphere equal to or lower than the decomposition temperature of the additive in the step,
the predetermined temperature is 500° C. to 700° C., and
the method further comprising a step of replacing a gas in the calcination atmosphere with air in a gas replacing time of 180 seconds or less in the calcination step.

2. The method for producing the catalyst according to claim 1 , wherein the temperature raising rate in the step of raising the temperature is 2° C./min or more.

3. The method for producing the catalyst according to claim 1 , wherein the gas replacing time is 90 seconds or less in the calcination step.

4. The method for producing the catalyst according to claim 1 , wherein a molar ratio of Mo, Fe, and Bi in the slurry is 12:1.3 or more:0.5 or less.

5. The method for producing the catalyst according to claim 1 , wherein the decomposition temperature of the additive is in a range of 100° C. to 400° C.

6. The method for producing the catalyst according to claim 1 , wherein the additive is a carboxylic acid.

7. A method for producing an unsaturated nitrile, comprising:
a step of obtaining a catalyst by the method according to claim 1 ; and
a step of bringing an olefin into contact with ammonia and molecular oxygen in a presence of the catalyst to produce the unsaturated nitrile.

Assignees

• Asahi Chemical Ind

Inventors

• Morii Kazunari
• Fukuzawa Akiyoshi
• Kaneta Masatoshi

Classifications

• B01J37/08

  Heat treatment {(B01J37/0009, B01J37/0018 take precedence)} · CPC title

• B01J23/887

  containing in addition other metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36 · CPC title

• B01J2523/68

  Molybdenum · CPC title

• C07C253/26

  containing carbon-to-carbon multiple bonds, e.g. unsaturated aldehydes · CPC title

• C07C255/08

  Acrylonitrile; Methacrylonitrile · CPC title