Purification process

• US 10,722,833 B2
• Filed: 09/12/2018
• Issued: 07/28/2020
• Est. Priority Date: 09/29/2011
• Status: Active Grant

• Current Assignee: Johnson Matthey PLC
• Original Assignee: Johnson Matthey PLC
• Inventors: Baptist, Colin, Cahill, Claire, Cousins, Matthew John, Davis, David, Wilson, Michelle Taylor, Young, Christopher John
• Primary Examiner(s): Mueller, Derek N
• Application Number:
  US16/128,585
• Publication Number:
  US 20190009206A1
• Time in Patent Office: 685 Days
• CPC Class Codes: B01D 15/00 Separating processes involving the treatment of liquids with solid sorbents using liquid sorbents B01D11/00; ion exchange processes or materials, sorbent materials in general B01J, e.g. sorbents for chromatography B01J20/281; for investigating or analysing materials G01N30/00; Apparatus therefor
• CPC Class Codes: B01D 15/10 characterised by constructional or operational features
• CPC Class Codes: B01D 15/1871 placed in series
• CPC Class Codes: B01D 2256/16 Hydrogen
• CPC Class Codes: B01D 2256/24 Hydrocarbons
• CPC Class Codes: B01D 2257/204 Inorganic halogen compounds
• CPC Class Codes: B01D 2257/2045 Hydrochloric acid
• CPC Class Codes: B01D 2257/206 Organic halogen compounds
• CPC Class Codes: B01D 2257/2064 Chlorine
• CPC Class Codes: B01D 2259/402 using two beds
• CPC Class Codes: B01D 2259/414 using different types of adsorbents
• CPC Class Codes: B01D 53/02 by adsorption, e.g. preparative gas chromatography solid sorbent compositions B01J20/00, preparation of inorganic compounds or elements C01
• CPC Class Codes: C01B 7/0718 by adsorption
• CPC Class Codes: C01B 7/093 Hydrogen bromide
• CPC Class Codes: C07C 7/12 by adsorption, i.e. purification or separation of hydrocarbons with the aid of solids, e.g. with ion-exchangers
• CPC Class Codes: Y02P 20/151 Reduction of greenhouse gas [GHG] emissions, e.g. CO2

Abstract

A process is described for removing halogen compounds, particularly chlorine compounds, from a process fluid, comprising the steps of (i) passing a process fluid containing hydrogen halide over a first sorbent to remove hydrogen halide and generate a hydrogen halide depleted process fluid and then, (ii) passing the hydrogen halide depleted process fluid over a second different sorbent to remove organic halide compounds therefrom. A purification system suitable for removing hydrogen halide and organic halide compounds from process fluids is also described.

Claims

1. A process for removing a halogen compound from a process fluid, comprising the steps of:

(i) passing a process fluid containing hydrogen halide over a first sorbent comprising an alkalized alumina to remove hydrogen halide and generate a hydrogen halide depleted process fluid; and

then

(ii) passing the hydrogen halide depleted process fluid over a second sorbent comprising zeolite 13X to remove an organic halide compound.

2. The process of claim 1, wherein the process fluid is a hydrogen gas stream comprising 50% vol or greater of hydrogen.

3. The process of claim 1, wherein the process fluid is a liquid stream comprising a hydrocarbon or a gas stream comprising a hydrocarbon.

4. The process of claim 1, wherein the process fluid is a liquid stream comprising a hydrocarbon.

5. The process of claim 1, wherein the halogen compound is a bromine compound or a chlorine compound.

6. The process of claim 5, wherein the halogen compound is a chlorine compound.

7. The process of claim 1, wherein the hydrogen halide content of the process fluid fed to the first sorbent is in the range of from 0.1 to 20 ppm.

8. The process of claim 1, wherein the first sorbent comprises acidic sites that form one or more organic halide compounds.

9. The process of claim 1, wherein the process fluid from step (ii) is passed over a third sorbent to remove residual or formed hydrogen halide.

10. The process of claim 9, wherein the third sorbent is the same as the first sorbent.

11. The process of claim 1, wherein the temperature is in a range of from 0°

C. to 300°

C.

12. The process of claim 11, wherein the temperature is in a range of from 0°

C. to 200°

C.

13. The process of claim 12, wherein the temperature in a range of from 10°

C. to 100°

C.

14. The process of claim 1, wherein the pressure is in a range of from 1 to 100 bar abs.

15. The process of claim 14, wherein the pressure is in a range of from 1 to 40 bar abs.

16. A purification system for removing a halogen compound from a process fluid, the system comprising:

a first sorbent that removes hydrogen halide from said process fluid to generate a hydrogen halide depleted process fluid; and

a second sorbent downstream of said first sorbent that removes the organic halide compound from the hydrogen halide depleted process fluid,

wherein;

the first sorbent comprises pellets, granules or extrudates comprising an alkalised alumina, and the second sorbent comprises pellets, granules or extrudates comprising zeolite 13X.

17. The purification system of claim 16, wherein the first sorbent comprises acidic sites and forms one or more organic halide compounds.

18. The purification system of claim 16, further comprising a third sorbent downstream of the second sorbent, wherein the third sorbent removes hydrogen halide from the process fluid.

19. The purification system of claim 18, wherein the third sorbent is the same as the first sorbent.

20. The purification system of claim 16, wherein the first and second sorbents are in the same vessel.