Method and installation for regulating the modifier level in chromatography or supercritical extraction with recycling
First Claim
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1. A separation method, including:
- performing a separating operation in a separation device, with the separation device receiving a product and feeding into an eluent that includes a supercritical fluid, routed via a first pumping operation, and a modifier, routed via at least one second pumping operation,collecting at least one fraction of the product downstream of the separation device,recycling the supercritical fluid mixed with a residual quantity of modifier, following after the collecting operation and preceding the first pumping operation, with the first pumping operation being used to pump at least the supercritical fluid mixed with a residual quantity of modifier, andperforming a condensing operation following after the collecting operation and preceding the first pumping operation,the method being characterised in that it further includes;
downstream of the collecting operation and upstream of the separating operation, determining at least one magnitude associated with the level of modifier mixed with the recycled supercritical fluid, and if necessarycorrecting the flow in the first pumping operation and the flow in the second pumping operation, in order to limit the variations, during execution of the method, of the modifier level in the eluent at the input to the separation device, in a direction that is suitable for meeting a first setpoint, determined beforehand, for the total flow.
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Abstract
A chromatography or supercritical extraction method is disclosed, in which the eluent comprises a mixture of a fluid and a modifier and in which the fluid is recycled. One exemplary method comprises an operation consisting in determining at least one quantity linked to the level of modifier that is mixed with the recycled fluid and, if necessary, a correction operation in order to limit variations in the level of modifier in the eluent at the inlet of the column or the extractor. The disclosure also relates to a chromatography or extraction installation.
17 Citations
10 Claims
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1. A separation method, including:
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performing a separating operation in a separation device, with the separation device receiving a product and feeding into an eluent that includes a supercritical fluid, routed via a first pumping operation, and a modifier, routed via at least one second pumping operation, collecting at least one fraction of the product downstream of the separation device, recycling the supercritical fluid mixed with a residual quantity of modifier, following after the collecting operation and preceding the first pumping operation, with the first pumping operation being used to pump at least the supercritical fluid mixed with a residual quantity of modifier, and performing a condensing operation following after the collecting operation and preceding the first pumping operation, the method being characterised in that it further includes; downstream of the collecting operation and upstream of the separating operation, determining at least one magnitude associated with the level of modifier mixed with the recycled supercritical fluid, and if necessary correcting the flow in the first pumping operation and the flow in the second pumping operation, in order to limit the variations, during execution of the method, of the modifier level in the eluent at the input to the separation device, in a direction that is suitable for meeting a first setpoint, determined beforehand, for the total flow. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification