C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
C07C 7/11 (2006.01) B01D 53/14 (2006.01) B01D 53/18 (2006.01) C10G 70/06 (2006.01)
Patent
CA 2359343
An inline, high-shear mixer (20) is provided in a cracked gas stream (12) upstream of a caustic tower (38) in an ethylene production unit. Spent caustic (52) is withdrawn from the bottom of the caustic tower (38) and pumped to the mixer (20), where the spent caustic mixes with and absorbs acid gas components from the cracked gas stream (12). The spent caustic is separated from the cracked gas, forming a partially treated cracked gas stream (26). The partially treated cracked gas stream (26) is then fed to the caustic tower (38). Polymer deposition in the caustic tower (38) is reduced because polymeric material is formed when the cracked gas stream is mixed with the spent caustic and is removed before the cracked gas stream is fed to the caustic tower (38).
L'invention concerne un mélangeur à cisaillement élevé (20) en ligne dans un courant de gaz de craquage (12) en amont d'une tour caustique (38) dans une unité de production d'éthylène. La soude caustique usée (52) est retirée du fond de la tour caustique (38) et pompée pour être envoyée dans le mélangeur (20) où elle se mélange avec, et absorbe, des composants de gaz acides provenant du courant de gaz de craquage (12). La substance caustique usée est séparée du gaz de craquage en formant un courant de gaz de craquage (26) partiellement traité. Ce courant de gaz (26) de craquage partiellement traité est ensuite transmis à la tour caustique (38). Le dépôt de polymères dans la tour caustique (38) est réduit car le matériau polymère est formé lorsque ce courant de gaz de craquage est mélangé à la substance caustique usée et est retiré avant que le courant de gaz de craquage ne soit envoyé dans la tour caustique (38).
Moffat & Co.
Stone & Webster Engineering Corporation
Stone & Webster Process Technology Inc.
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