Invention Grant
- Patent Title: Method for recovering HCI from a HCI containing gas stream
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Application No.: US15560400Application Date: 2016-03-25
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Publication No.: US10773957B2Publication Date: 2020-09-15
- Inventor: Hendrik Jan Vos , Lars Magnus Tollin , Cornelis Kooijman
- Applicant: NOURYON CHEMICALS INTERNATIONAL B.V.
- Applicant Address: NL Arnhem
- Assignee: NOURYON CHEMICALS INTERNATIONAL B.V.
- Current Assignee: NOURYON CHEMICALS INTERNATIONAL B.V.
- Current Assignee Address: NL Arnhem
- Agency: Lorenz & Kopf, LLP
- Priority: com.zzzhc.datahub.patent.etl.us.BibliographicData$PriorityClaim@7acc8b7c
- International Application: PCT/EP2016/056688 WO 20160325
- International Announcement: WO2016/156257 WO 20161006
- Main IPC: C01B7/07
- IPC: C01B7/07 ; B01D53/14 ; C07C51/487 ; B01D53/68 ; C07C51/377 ; C07C7/00

Abstract:
The invention pertains to a method for recovering HCl from a HCl containing gas stream wherein a HCl containing gas stream with a temperature of −20 to 25° C. is provided to an adiabatic absorption unit where it is contacted with water as an absorbent, resulting in the formation of a top gas stream and a aqueous HCl product solution, wherein the temperature of the top gas stream is at least 70° C. and wherein the aqueous HCl product solution has a HCl concentration in the range of 5-20 wt. %. It is preferred for the HCl-containing gas stream to be derived from a hydrogenation step wherein a feed comprising monochloroacetic acid (MCA) and dichloroacetic acid (DCA) is reacted with hydrogen to form a HCl-containing gas stream and a product stream comprising MCA and a reduced amount of DCA. The HCl product solution is preferably diluted to a concentration of 1-8 wt. %, and the diluted solution is used as absorbent in a second absorption step, wherein HCl is absorbed from a further HCl-containing gas stream to form a second aqueous HCl solution. The further HCl-containing gas stream is preferably derived from a chlorination step wherein acetic acid is reacted with chlorine, resulting in the formation of the further HCl-containing gas stream and a feed comprising monochloroacetic acid (MCA) and dichloroacetic acid (DCA).
Public/Granted literature
- US20180057358A1 Method for Recovering HCl from a HCl Containing Gas Stream Public/Granted day:2018-03-01
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