Process for producing unsaturated nitrile

Patent metadata

Field	Value
Publication number	US-10640458-B2
Application number	US-201816314723-A
Country	US
Kind code	B2
Filing date	Jun 8, 2018
Priority date	Jun 9, 2017
Publication date	May 5, 2020
Grant date	May 5, 2020

Abstract

A process for producing unsaturated nitrile, using a fluidized bed reactor having an internal space having a catalyst capable of being fluidized therein, a feed opening to feed a starting material gas comprising hydrocarbon to the internal space, and a discharge port to discharge a reaction product gas from the internal space, the process comprising a reaction step of subjecting the hydrocarbon to a vapor phase catalytic ammoxidation reaction in the presence of the catalyst in the internal space to produce the corresponding unsaturated nitrile, wherein when in the internal space, a space where an existing amount of the catalyst per unit volume is 150 kg/m3 or more is defined as a dense zone and a space where an existing amount of the catalyst per unit volume is less than 150 kg/m3 is defined as a sparse zone in the reaction step, a gas residence time in the sparse zone is 5 to 50 sec.

First claim

The invention claimed is:

1. A process for producing unsaturated nitrile, using a fluidized bed reactor having an internal space comprising a catalyst capable of being fluidized therein; a feed opening to feed a starting material gas comprising hydrocarbon to the internal space; and a discharge port to discharge a reaction product gas from the internal space, the process comprising a reaction step of subjecting the hydrocarbon to a vapor phase catalytic ammoxidation reaction in the presence of the catalyst in the internal space to produce the corresponding unsaturated nitrile, wherein
when in the internal space, a space where an existing amount of the catalyst per unit volume is 150 kg/m 3 or more is defined as a dense zone and a space where an existing amount of the catalyst per unit volume is less than 150 kg/m 3 is defined as a sparse zone in the reaction step, a gas residence time in the sparse zone is 5 to 50 sec.

2. The process for producing the unsaturated nitrile according to claim 1 , wherein a superficial gas velocity in the sparse zone is less than 1 m/s in the reaction step.

3. The process for producing the unsaturated nitrile according to claim 1 , wherein an oxygen concentration in the reaction product gas discharged from the discharge port is 0.1 vol % or more in the reaction step.

4. The process for producing the unsaturated nitrile according to claim 1 , wherein the oxygen concentration in the reaction product gas discharged from the discharge port is 0.1 vol % or more but 5.0 vol % or less in the reaction step.

5. The process for producing the unsaturated nitrile according to claim 1 , wherein
when the oxygen concentration in the reaction product gas discharged from the discharge port is less than 2.0 vol % in the reaction step, the relation of
(the gas residence time) ≤7.5 ×(the oxygen concentration) +30 is satisfied, and
when the oxygen concentration in the reaction product gas discharged from the discharge port is 2.0 vol % or more in the reaction step, the relation of
(the gas residence time)≤−3×(the oxygen concentration) +50 is satisfied.

6. The process for producing the unsaturated nitrile according to claim 1 , wherein the hydrocarbon is propane and/or propylene.

Assignees

• Asahi Chemical Ind

Inventors

• Tamura Sho
• Nagata Dai

Classifications

• B01J21/08

  Silica · CPC title

• B01J8/0055 Primary

  using cyclones · CPC title

• C07C253/24 Primary

  by ammoxidation of hydrocarbons or substituted hydrocarbons · CPC title

• C07C253/26 Primary

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

• B01J2208/00548

  Flow · CPC title