Process for manufacturing a sorbent for a flue gas treatment process, sorbent and use of said sorbent in such flue gas treatment process

Patent metadata

Field	Value
Publication number	US-12564825-B2
Application number	US-202217717813-A
Country	US
Kind code	B2
Filing date	Apr 11, 2022
Priority date	Apr 7, 2017
Publication date	Mar 3, 2026
Grant date	Mar 3, 2026

Abstract

The present invention is related to a process for manufacturing a sorbent suitable for a use in a circulating dry scrubber device comprising the steps of: providing quicklime and water in an hydrator; slaking said quicklime via a non-wet route in the hydrator; collecting a lime based sorbent at an exit of the hydrator. The process is characterized in that it comprises a further step of adding at least a first additive comprising: a compound comprising silicon, and/or, a compound comprising aluminum, and/or a compound comprising silicon and aluminum before or during said slaking step, at a molar ratio between silicon or aluminum or a combination thereof and the calcium provided to said hydrator equal to or below 0.2 and equal to or above 0.02. In some other aspects, the present invention is related to a sorbent, a premix, and a flue gas treatment process.

First claim

The invention claimed is:

1 . A circulating dry scrubber lime based sorbent, the sorbent comprising:
at least 50 weight % of Ca(OH) 2 and at least 0 .5 weight % of silicon or aluminum or a combination thereof expressed under its elemental form and at most 8 weight % of silicon or aluminum or a combination thereof expressed under their elemental form, with respect to the total weight of said sorbent under a dry form, and at least 0.1 weight % of sodium expressed under its equivalent Na 2 O oxide form with respect to the total weight of said sorbent under a dry form; wherein said sorbent further comprises 1 to 12 weight % of bound water with respect to the total weight of said sorbent under a dry form, said bound water being measured between 150° C. and 350° C., and in that from 1 to 40 mol % of calcium is neither under the form of Ca(OH) 2 or CaCO 3 nor CaO, in that the molar ratio (Si+Al)/Ca is of at least 0.02 and of maximum 0.2, and in that the molar ratio (Si+Al)/Na is of at least 0.4 and of maximum 10.

2 . Sorbent according to claim 1 , wherein said sorbent further comprises at least 0.1 and at most 15 weight % of sodium expressed under its equivalent Na 2 O oxide form with respect to the total weight of said sorbent under a dry form.

3 . Sorbent according to claim 1 , wherein said sorbent has a specific surface area of at least 3 m 2 /g and of maximum 25 m 2 /g measured by manometry with adsorption of nitrogen after degasing in vacuum at 190° C. for at least 2 hours and calculated according to the multipoint BET method as set out in the ISO 9277/2010E standard.

4 . Sorbent according to claim 1 , wherein said sorbent has a total pore volume of at least 0.01 cm 3 /g and of maximum 0.15 cm 3 /g determined by manometry with adsorption of nitrogen after degasing in vacuum at 190° C. for at least 2 hours and calculated according to the BJH method as set out in the ISO 9277/2010E standard.

Assignees

• Lorgouilloux Marion
• Maazoun Mehdi
• Nyssen Olivier
• Heiszwolf Johan
• Lhoist Rech Et Developpement Sa

Inventors

• Lorgouilloux Marion
• Maazoun Mehdi
• Nyssen Olivier
• Heiszwolf Johan

Classifications

• B01J20/28071

  being less than 0.5 ml/g · CPC title

• B01J20/28059

  being less than 100 m2/g · CPC title

• B01D2253/311

  Porosity, e.g. pore volume · CPC title

• B01D2253/306

  Surface area, e.g. BET-specific surface · CPC title

• B01D53/80

  Semi-solid phase processes, i.e. by using slurries · CPC title