Fixed-bed multi-tubular reactor for producing alkenyl acetate

Patent metadata

Field	Value
Publication number	US-11607656-B2
Application number	US-202017289352-A
Country	US
Kind code	B2
Filing date	Oct 28, 2020
Priority date	Dec 16, 2019
Publication date	Mar 21, 2023
Grant date	Mar 21, 2023

Abstract

A fixed-bed multi-tubular reactor for producing an alkenyl acetate by a gas phase catalytic oxidation reaction of a lower olefin, acetic acid and oxygen including a plurality of reaction tubes, a thermometer protection tube inserted into at least one of the plurality of reaction tubes, a thermometer inserted into the thermometer protection tube, and a shield disposed above the reaction tube into which the thermometer protection tube is inserted and attached to the thermometer protection tube, wherein an effective projection region of the shield entirely covers the inlet opening of the reaction tube into which the thermometer protection tube is inserted.

First claim

The invention claimed is:

1. A fixed-bed multi-tubular reactor for producing an alkenyl acetate, comprising:
a plurality of reaction tubes to which a raw material gas and a mist of an aqueous solution of an alkali metal acetate are supplied from an upper part of the fixed-bed multi-tubular reactor and which each have an inlet opening and an upper plane,
a thermometer protection tube inserted into at least one of the plurality of reaction tubes from the upper part of the fixed-bed multi-tubular reactor,
a thermometer inserted into the thermometer protection tube, and
a shield disposed above the reaction tube into which the thermometer protection tube is inserted and attached to the thermometer protection tube,
wherein an effective projection region of the shield entirely covers the inlet opening of the reaction tube into which the thermometer protection tube is inserted, wherein the effective projection region of the shield is an area on a reference plane obtained by projecting, in a perpendicular direction to the reference plane including the upper plane of the reaction tube into which the thermometer protection tube is inserted and extending in parallel with the upper plane, an area surrounded by line segments connecting points of the shield at which liquid droplets are separated from the shield and drop, when the mist of an aqueous solution of an alkali metal acetate contacts the shield and flows down as the liquid droplets.

2. The fixed-bed multi-tubular reactor according to claim 1 , wherein the shield is a disk.

3. The fixed-bed multi-tubular reactor according to claim 2 , wherein the diameter of the disk is larger than the inner diameter of the reaction tube.

4. The fixed-bed multi-tubular reactor according to claim 1 , wherein the alkali metal acetate is at least one selected from the group consisting of potassium acetate and cesium acetate.

5. The fixed-bed multi-tubular reactor according to claim 1 , wherein the number of the reaction tubes into which the thermometer protection tube is inserted is 3 to 10.

6. The fixed-bed multi-tubular reactor according to claim 1 , wherein the thermometer is a thermocouple or a resistance thermometer.

7. A fixed-bed multi-tubular reactor for producing an alkenyl acetate, comprising:
a plurality of reaction tubes to which a raw material gas and a mist of an aqueous solution of an alkali metal acetate are supplied from an upper part of the fixed-bed multi-tubular reactor and which each have an inlet opening and an upper plane,
a thermometer protection tube inserted into at least one of the plurality of reaction tubes from the upper part of the fixed-bed multi-tubular reactor,
a thermometer inserted into the thermometer protection tube, and
a shield disposed above the reaction tube into which the thermometer protection tube is inserted and attached to the thermometer protection tube,
wherein an effective projection region of the shield does not overlap at all the inlet opening of the reaction tube into which the thermometer protection tube is inserted, wherein the effective projection region of the shield is an area on a reference plane obtained by projecting, in a perpendicular direction to the reference plane including the upper plane of the reaction tube into which the thermometer protection tube is inserted and extending in parallel with the upper plane, an area surrounded by line segments connecting points of the shield at which liquid droplets are separated from the shield and drop, when the mist of an aqueous solution of an alkali metal acetate contacts the shield and flows down as the liquid droplets.

Assignees

• Showa Denko Kk

Inventors

• Iwama Yasuhiro
• Ikushima Maiko
• Umehara Kazuki
• Tanaka Mitsuru
• Maki Toshiyuki

Classifications

• C07C67/055 Primary

  in the presence of platinum group metals or their compounds · CPC title

• B01J2208/00061

  of the reactants · CPC title

• B01J2208/065

  Heating or cooling the reactor · CPC title

• B01J8/008

  Details of the reactor or of the particulate material; Processes to increase or to retard the rate of reaction (B01J8/0285, B01J8/067, B01J8/087, B01J8/1836 take precedence) · CPC title

• B01J8/065 Primary

  Feeding reactive fluids · CPC title