Process for separating out an effluent obtained from an oligomerization step
AssigneeIfp Energies Nouvelles
InventorsPierre-Alain Breuil, Nicolas Aribert, Olivier Cotte
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Abstract
The present invention relates to a process for treating an effluent obtained from an oligomerization step in a vaporization step. In particular, the oligomerization step is a step for dimerization of ethylene to 1-butene with a nickel-based catalytic system.
Claims20
A process for treating an effluent obtained from a dimerization step having selectivity for 1-butene, the process comprising a step of neutralizing said effluent obtained from a dimerization step to deactivate a catalytic composition followed by a step of thermal separation of the neutralized effluent, comprising:
- a first vaporization step performed at a pressure of between 2.0 and 5.0 MPa and at a temperature of between 90° C. and 130° C., to obtain a first liquid fraction sent to a second vaporization step, and a first gas fraction,
- wherein said second vaporization step is performed at a pressure of between 0.5 and 3.0 MPa and at a temperature of between 90° C. and 130° C., to obtain a second liquid fraction and a second gas fraction;
- wherein the pressure of the first vaporization step is higher than the pressure of the second vaporization step,
- wherein the thermal separation step further comprises a third vaporization step into which the second liquid fraction obtained from the second vaporization step is sent, wherein said third vaporization step is performed at a pressure of between 0.3 and 1.2 MPa and at a temperature of between 8° and 140° C., wherein a third liquid fraction and a third gas fraction are obtained;
- wherein the pressure of the second vaporization step is higher than the pressure of the third vaporization step;
- and
- wherein the step of neutralizing the effluent obtained from the dimerization step is performed by placing said effluent in contact with a neutralizing system comprising an alcohol of formula R1OH and an amine of formula NR2R3R4
- wherein
- R1 is a linear a group containing 2 to 20 carbon atoms or a branch alkyl group containing 3 to 20 carbon atoms, or an aryl group containing 5 to 30 carbon atoms, R2, R3 and R4, which may be identical or different, are independently a hydrogen, or a linear alkyl group containing 1 to 20 carbon atoms and optionally substituted with an NH2 group, or a branched alkyl group containing 3 to 20 carbon atoms and optionally substituted with an NH2 group.
A process for treating an effluent obtained from a dimerization step having selectivity for 1-butene, the process comprising a step of neutralizing said effluent obtained from a dimerization step to deactivate a catalytic composition followed by a step of thermal separation of the neutralized effluent, comprising:
- a first vaporization step performed at a pressure of between 2.0 and 5.0 MPa and at a temperature of between 90° C. and 130° C., to obtain a first liquid fraction sent to a second vaporization step, and a first gas fraction,
- wherein said second vaporization step is performed at a pressure of between 0.5 and 3.0 MPa and at a temperature of between 90° C. and 130° C., to obtain a second liquid fraction and a second gas fraction;
- wherein the pressure of the first vaporization step is higher than the pressure of the second vaporization step,
- wherein the thermal separation step further comprises a third vaporization step into which the second liquid fraction obtained from the second vaporization step is sent, wherein said third vaporization step is performed at a pressure of between 0.3 and 1.2 MPa and at a temperature of between 80 and 140° C., wherein a third liquid fraction and a third gas fraction are obtained;
- wherein the pressure of the second vaporization step is higher than the pressure of the third vaporization step;
- and
- wherein the step of neutralizing the effluent obtained from the dimerization step is performed by placing said effluent in contact with a neutralizing system comprising an alcohol of formula R1OH and an amine of formula NR2R3R4
- wherein
- R1 is a linear alkyl group containing 2 to 20 carbon atoms or a branched alkyl group containing 3 to 20 carbon atoms, or an aryl group containing 5 to 30 carbon atoms, R2, R3 and R4, which may be identical or different, are independently a hydrogen, or a linear alkyl group containing 1 to 20 carbon atoms and optionally substituted with an NH2 group, or a branched alkyl group containing 3 to 20 carbon atoms and optionally substituted with an NH2 group,
- wherein a mole ratio of the amine of the formula NR2R3R4 to the alcohol of the formula R1OH is between 0.5 and 100.
Dependencies are inferred from the claim text.