Process for preparing bromotrichloromethane

Patent metadata

Field	Value
Publication number	US-11261145-B2
Application number	US-201816495424-A
Country	US
Kind code	B2
Filing date	Mar 12, 2018
Priority date	Mar 20, 2017
Publication date	Mar 1, 2022
Grant date	Mar 1, 2022

Abstract

The present invention relates to a process for preparing bromotrichloromethane comprising
a) providing bromine in chloroform; and b) radiation of the resulting solution with light in the range of 350 to 550 nm, wherein said solution of bromine in chloroform is not radiated with radiation of a wavelength below 350 nm.

First claim

The invention claimed is:

1. A process for preparing bromotrichloromethane comprising
a) providing a solution of bromine in chloroform; and
b) radiation of the resulting solution with light in the range of 350 to 550 nm, wherein said solution of the bromine in the chloroform is not radiated with radiation of a wavelength below 350 nm.

2. The process of claim 1 , wherein the light is a light-emitting diode.

3. The process of claim 1 , wherein the wavelength of the radiation is in the range of 380 to 550 nm.

4. The process of claim 1 , wherein the light is monochromatic.

5. The process of claim 1 , wherein the process is carried out in the absence of oxygen.

6. The process of claim 1 , wherein said process is carried out in the absence of alcohols.

7. The process of claim 1 , wherein the light does not emit radiation below 350 nm.

8. The process of claim 1 , wherein reaction temperature is from −20° C. to 60° C.

9. The process of claim 1 , wherein reaction pressure is in the range of 0.1-20 bar.

10. The process of claim 1 , wherein content of the bromine in the solution of the bromine in the chloroform in step a) is from 0.1 to 10% by weight.

11. The process of claim 1 , wherein the bromine is generated in situ.

12. The process of claim 1 , wherein the process is carried out under a nitrogen atmosphere.

13. The process of claim 5 , wherein:
reaction temperature is from −20° C. to 60° C.;
reaction pressure is in the range of 0.1-20 bar; and
content of the bromine in the solution of the bromine in the chloroform in step a) is from 0.1 to 10% by weight.

Assignees

• Basf Se

Inventors

• Schaefer Bernd
• Goetz Roland
• Hickmann Volker
• Maywald Volker
• Saelinger Daniel

Classifications

• C07C17/10 Primary

  of hydrogen atoms (combined with addition of halogens to unsaturated hydrocarbons C07C17/06) · CPC title

• B01J2219/1203

  Incoherent waves · CPC title

• B01J2219/0877

  Liquid · CPC title

• B01J19/127

  Sunlight; Visible light · CPC title

• B01J19/123

  Ultraviolet light · CPC title