Composition and process for removing chlorides from a gaseous stream

Patent metadata

Field	Value
Publication number	US-2018154331-A1
Application number	US-201815887727-A
Country	US
Kind code	A1
Filing date	Feb 2, 2018
Priority date	Aug 12, 2015
Publication date	Jun 7, 2018
Grant date	—

Abstract

A composition capable of removing chlorides from a gaseous stream and a process of using same. The compositions have sufficient chloride capacity, offer comparable creation of green oil, and have sufficient structural integrity to be utilized as sorbents in a chloride removal process. Generally, the compositions include a first zinc carbonate, a second zinc carbonate different than the first zinc carbonate and an alumina material. The composition has been cured at a temperature between about 149 to 399° C. The first zinc carbonate may comprise hydrozincite and the second zinc carbonate may comprise smithsonite.

First claim

What is claimed is:

1 . A composition comprising:
a first zinc carbonate; a second zinc carbonate different than the first zinc carbonate; an alumina material, wherein the alumina material comprises less than 10 wt % of the composition, and wherein the first zinc carbonate comprises hydrozincite, and wherein the composition has been cured at a temperature between 149 to 399° C.

2 . The composition of claim 1 wherein the second zinc carbonate comprises smithsonite.

3 . The composition of claim 1 wherein the alumina material comprises less than 5 wt % of the composition.

4 . The composition of claim 1 wherein the composition includes at least two pairs of x-ray diffraction peaks at a two-theta value selected from a group consisting of: about 12.80 and about 17.30; about 13.00 and about 36.00; and, about 25.00 and about 32.50.

5 . The composition of claim 4 , wherein the composition further includes at least one x-ray diffraction peak or pair of peaks at a two-theta value selected from a group consisting of: about 34.30; about 35.00 and 38.00; and, about 30.50 and about 34.50.

6 . The composition of claim 1 wherein the composition has been cured at a temperature between 260 to 316° C.

7 . The composition of claim 1 wherein the composition lacks an x-ray diffraction peak at a two-theta value of about 14.50.

8 . The composition of claim 1 further comprising:
zinc oxide.

9 . The composition of claim 1 further comprising:
about 42 wt % zinc.

10 . The composition of claim 8 further comprising:
about 16 wt % sodium.

11 . A composition for adsorbing chloride compounds, the composition comprising:
a first zinc carbonate, wherein the first zinc carbonate comprises hydrozincite or smithsonite; a second zinc carbonate different than the first zinc carbonate; an alumina material; and, zinc oxide.

12 . The composition of claim 11 wherein the composition includes at least two pairs of x-ray diffraction peaks at a two-theta value selected from a group consisting of: about 12.80 and about 17.30; about 13.00 and about 36.00; and, about 25.00 and about 32.50.

13 . The composition of claim 11 wherein the first zinc carbonate comprises hydrozincite, and wherein the second zinc carbonate comprises smithsonite.

14 . The composition of claim 13 , wherein the composition has been cured at a temperature between 260 to 316° C.

15 . The composition of claim 11 further comprising:
sodium carbonate.

16 . The composition of claim 15 wherein the composition comprises about 42 wt % zinc and about 16 wt % sodium.

17 . The composition of claim 11 wherein the composition is substantially free of boehmite.

18 . A process for removing chloride compounds from a gaseous stream, the process comprising:
passing a gaseous stream to an adsorption zone, the adsorption zone comprising an adsorbent and being operated under conditions to remove chloride compounds from the gaseous stream, wherein the adsorbent comprises a first zinc carbonate being hydrozincite or smithsonite, a second zinc carbonate different than the first zinc carbonate, and, zinc oxide.

19 . The process of claim 18 wherein the adsorbent comprises about 42 wt % zinc.

20 . The process of claim 19 wherein the first zinc carbonate comprises smithsonite, and wherein the second zinc carbonate comprises hydrozincite, and wherein the adsorbent is substantially free of boehmite.

Assignees

• Uop Llc

Inventors

• Gajda Gregory
• Riley Mark G
• Singh Charanjeet

Classifications

• B01J20/08 Primary

  comprising aluminium oxide or hydroxide; comprising bauxite · CPC title

• B01J20/28071

  being less than 0.5 ml/g · CPC title

• B01D2257/2045

  Hydrochloric acid · CPC title

• B01J20/043

  Carbonates or bicarbonates, e.g. limestone, dolomite, aragonite · CPC title

• B01J20/28057

  Surface area, e.g. B.E.T specific surface area · CPC title