Method for producing bromine

Patent metadata

Field	Value
Publication number	US-11713244-B2
Application number	US-201916525829-A
Country	US
Kind code	B2
Filing date	Jul 30, 2019
Priority date	Aug 2, 2018
Publication date	Aug 1, 2023
Grant date	Aug 1, 2023

Abstract

To provide a method that enables production of bromine in good yield. A method for producing bromine includes: a step of supplying a gas containing a bromine compound and a gas containing oxygen to a reactor that includes a catalyst packed bed, and oxidizing the bromine compound to obtain a gas containing bromine, in which the step satisfies the following 0.30≤a≤0.55 and 0.40≤L1≤6.0; where “a” represents porosity [−] of the catalyst packed bed, and “L1” is defined by the following Formula (3): Formula (3) L1=L2V/(P(aV+b))×(T+273.14)/273.14; wherein L2: Superficial velocity of reaction gas [m/s]; LP: Reaction pressure [atm]; T: Reaction temperature [° C.]; V: Reactor volume corresponding to catalyst packed bed [L]; a: Porosity of catalyst packed bed [−] and b: Pore volume of catalyst packed bed [L].

First claim

What is claimed is:

1. A method for producing bromine, comprising
a step of supplying a gas containing a bromine compound and a gas containing oxygen to a reactor that includes a catalyst packed bed, and oxidizing the bromine compound to obtain a gas containing bromine,
wherein the step satisfies the following Inequality (1) and Inequality (2):
0.30≤ a≤ 0.55  Inequality (1)

0.40≤ L 1≤6.0  Inequality (2)

where “a” represents porosity [−] of the catalyst packed bed, and “L1” is defined by the following Formula (3):
L 1= L 2 V /( P ( aV+b ))×( T+ 273.14)/273.14  Formula (3)

L2: Superficial velocity of reaction gas [m/s]
P: Reaction pressure [atm]
T: Reaction temperature [° C.]
V: Reactor volume corresponding to catalyst packed bed [L]
a: Porosity of catalyst packed bed [−]
b: Pore volume of catalyst packed bed [L].

2. The method for producing bromine according to claim 1 , wherein the bromine compound is hydrogen bromide.

3. The method for producing bromine according to claim 1 , wherein the bromine compound in an outlet of the reactor has a conversion of 90% or more.

4. The method for producing bromine according to claim 1 , wherein a temperature at an outlet of the reactor is 250° C. to 400° C.

5. The method for producing bromine according to claim 1 , wherein the catalyst is at least one type of metal or metal compound selected from the group consisting of ruthenium, a compound of ruthenium, copper, a compound of copper, titanium, and a compound of titanium.

6. The method for producing bromine according to claim 1 , wherein the reactor is an adiabatic reactor.

7. The method for producing bromine according to claim 1 , wherein the reactor includes two or more catalyst packed beds connected in series.

8. The method for producing bromine according to claim 7 , wherein a temperature at an outlet of the lowermost catalyst packed bed with respect to a flow direction of the gas containing a bromine compound is lower than a temperature at an outlet of the catalyst packed bed of immediately upstream side of the lowermost catalyst packed bed.

9. The method for producing bromine according to claim 7 , wherein the uppermost catalyst packed bed with respect to a flow direction of the gas containing a bromine compound includes titanium oxide as a catalyst, and the lowermost catalyst packed bed with respect to a flow direction of the gas containing a bromine compound includes at least one selected from the group consisting of metallic ruthenium and a ruthenium compound as a catalyst.

10. The method for producing bromine according to claim 7 , further comprising
supplying the gas containing oxygen to each catalyst packed bed.

Assignees

• Sumitomo Chemical Co

Inventors

• Mikami Yusuke

Classifications

• C01B7/096 Primary

  Bromine · CPC title

• B01J19/245

  placed in series · CPC title