Process for the production of chlorinated propenes

Patent metadata

Field	Value
Publication number	US-9598334-B2
Application number	US-201314429263-A
Country	US
Kind code	B2
Filing date	Sep 13, 2013
Priority date	Sep 20, 2012
Publication date	Mar 21, 2017
Grant date	Mar 21, 2017

Abstract

Processes for the production of chlorinated propenes are provided. The present processes make use of 1,2-dichloropropane, a by-product in the production of chlorohydrin, as a low cost starting material, alone or in combination with 1,2,3-trichloropropane. At least one dehydrochlorination is conducted in the gas phase, and is the first process step. The present processes can also generate anhydrous HCl as a byproduct that can be removed from the process and used as a feedstock for other processes, providing further time and cost savings.

First claim

The invention claimed is:

1. A process for the production of chlorinated propenes from one or more chlorinated alkanes comprising 1,2-dichloropropane, comprising at least one gas phase dehydrochlorination step that is the first reaction step, wherein the gas phase dehydrochlorination is carried out without the use of a catalyst and at a pressure greater than ambient, wherein the gas phase dehydrochlorination produces one or more monochloropropenes; and wherein the one or more monochloropropenes are separated from the 1,2-dichloropropane, and after separation, the one or more monochloropropenes are subjected to at least one liquid phase chlorination step.

2. The process of claim 1 , wherein the chlorinated propenes comprise dichloropropenes, trichloropropenes, and/or tetrachloropropenes.

3. The process of claim 1 , wherein the one or more chlorinated alkanes further comprise 1,2,3-trichloropropane.

4. The process of claim 1 , comprising at least one additional dehydrochlorination step.

5. The process of claim 4 , wherein at least one additional dehydrochlorination step is conducted in the liquid phase, in the presence of one or more catalysts.

6. The process of claim 4 , wherein at least one additional dehydrochlorination step is conducted in the liquid phase, in the presence of caustic.

7. The process of claim 1 , wherein at least one chlorination step is conducted in the gas phase.

8. The process of claim 1 , wherein at least one chlorination step is conducted in the liquid phase.

9. The process of claim 1 , wherein HC1 is generated as a byproduct.

10. The process of claim 9 , wherein HC1 is recovered as anhydrous HC1.

11. The process of claim 1 , wherein the dehydrochlorination step is conducted at 200° C. or greater.

12. The process of claim 1 , wherein the 1,2-dichloropropane conversion is from 30% to 70%.

13. The process of claim 12 , wherein the 1,2-dichloropropane conversion is from 40% to 60%.

Assignees

• Blue Cube Ip Llc

Inventors

• Tirtowidjojo Max M

Classifications

• C07C17/10

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

• C07C17/25 Primary

  by splitting-off hydrogen halides from halogenated hydrocarbons · CPC title

• C07C17/04

  to unsaturated halogenated hydrocarbons · CPC title

• C07C21/04

  Chloro-alkenes · CPC title