Title:
METHOD FOR PRODUCING (METH)ACRYLONITRILE
Document Type and Number:
Japanese Patent JP2019104693
Kind Code:
A
Abstract:
To provide a method for producing (meth)acrylonitrile, which can produce the same stably for a long period and can maintain the reaction yield.SOLUTION: The method for producing (meth)acrylonitrile comprises the steps of: introducing raw material gases into a fluidized-bed reactor 1 and performing an ammoxidation reaction in the presence of a catalyst to obtain a reaction gas; and a step of introducing powder in a reaction gas discharge piping 4 and, while cleaning a heat exchanger 3 connected to the reaction gas discharge piping 4, discharging the reaction gas in the heat exchanger 3. The reaction gas discharge piping 4 includes: a first portion 4A which extends from the upper part of the fluidized-bed reactor 1 in a height direction thereof to reach the highest point 5 of the reaction gas discharge piping 4; and a second portion 4B which is connected to the highest point 5 and extends toward the heat exchanger 3, where a point 6 of introduction of the powder is at a position in the second portion 4B and at a lower position than the highest point 5.SELECTED DRAWING: Figure 1
Inventors:
YAMAMOTO TOMOHIRO
Application Number:
JP2017236864A
Publication Date:
June 27, 2019
Filing Date:
December 11, 2017
Export Citation:
Assignee:
ASAHI KASEI CORP
International Classes:
C07C253/26; C07C255/08
Domestic Patent References:
| JPH05301040A | 1993-11-16 | |||
| JPH07275686A | 1995-10-24 | |||
| JP2017518988A | 2017-07-13 | |||
| JPS5826998A | 1983-02-17 | |||
| JPS57178997U | 1982-11-12 | |||
| JP2011236995A | 2011-11-24 |
Foreign References:
| US5290529A | 1994-03-01 | |||
| US5177292A | 1993-01-05 | |||
| US4366855A | 1983-01-04 | |||
| WO2015183641A1 | 2015-12-03 |
Attorney, Agent or Firm:
Yoshiyuki Inaba
Toshifumi Onuki
Akihiko Eguchi
Kazuhiko Naito
Toshifumi Onuki
Akihiko Eguchi
Kazuhiko Naito