Extraction of sulphur-containing compounds in a first pretreatment reactor operating in batch mode followed by a second pretreatment reactor of the piston type

Patent metadata

Field	Value
Publication number	US-9708550-B2
Application number	US-201214360322-A
Country	US
Kind code	B2
Filing date	Oct 16, 2012
Priority date	Nov 24, 2011
Publication date	Jul 18, 2017
Grant date	Jul 18, 2017

Abstract

Process of extracting sulphur-containing compounds from a hydrocarbon cut of the gasoline or LPG type by liquid-liquid extraction with a soda solution employing a unit ( 2 ) for pretreatment of the feedstock to be treated located upstream of the unit ( 4 ) for extraction with soda, said pretreatment unit consisting of a first pretreatment reactor operating in batch mode followed by a second continuous reactor of the piston type operating in piston mode.

First claim

The invention claimed is:

1. A process extracting sulphur-containing compounds from a gasoline or LPG hydrocarbon cut comprising liquid-liquid extraction of salts with a soda solution in a pretreatment unit ( 2 ) located upstream of an extraction unit ( 4 ) employing soda to extract sulfur compounds as sodium thiolate, said pretreatment unit comprising a first pretreatment reactor operating in batch mode followed by a second continuous reactor operating in piston mode with a Peclet number

Pe
=

UL

D
ax

between 3 and 10, U denoting the linear velocity of flow of the hydrocarbon phase in the reactor, L the length of the reactor, and D ax the coefficient of axial dispersion of the hydrocarbon phase in the second continuous reactor.

2. The process according to claim 1 , in which the second continuous reactor has a volume of 0.5 and 1.5 times the volume of the first batch reactor.

3. The process according to claim 1 , in which effluents leaving the second continuous reactor enter a settling tank ( 17 ) recovering a soda flow ( 18 ), and reintroducing said soda flow ( 18 ) at a point of the second continuous reactor located at about mid-length of said reactor.

4. The process according to claim 1 , comprising a soda regeneration loop regenerating soda from the extraction unit, and wherein the soda used in the second continuous pretreatment reactor ( 16 ) is obtained from the loop for soda regeneration.

5. The process according to claim 4 , in which the soda used in the second continuous pretreatment reactor ( 16 ) is obtained from a point ( 7 ) located between a soda outlet from the extraction unit ( 4 ) and an oxidizer ( 9 ) regenerating the soda.

Assignees

• Ifp Energies Now

Inventors

• Augier Frederic
• Baudot Arnaud
• Gazarian Jeremy
• Leinekugel Le Cocq Damien

Classifications

• C10G53/06

  including only extraction steps, e.g. deasphalting by solvent treatment followed by extraction of aromatics · CPC title

• C10G21/28

  Recovery of used solvent · CPC title

• C10G21/08

  Inorganic compounds only · CPC title

• C10G21/30

  Controlling or regulating · CPC title

• C10G19/02

  with aqueous alkaline solutions · CPC title