Analysis device and associated method for operating simulated moving bed xylenes separation units a Raman spectrometer

摘要

The present invention describes an analysis device and a method associated with this device, said device comprising an analysis cell (8) containing an optrode (10), receiving an input laser signal and sending an output signal to the Raman spectrometer, and said method using two analysis routes: an analysis route 1 connected to the internal circulation current passing from adsorber B to adsorber A, and an analysis route 2 connected to the distilled raffinate originating from distillation column C.

主权项

1. A simulated moving bed xylenes separation system comprising:
two adsorbers A and B connected in series, a first circulation line for the flow of a circulation stream originating from the bottom of adsorber A to the top of adsorber B, second circulation line for the flow of a circulation stream originating from the bottom of adsorber B to the top of adsorber A, each of said adsorbers having a feed inlet for introducing a feed stream, an extract outlet for removing an extract stream, and a raffinate outlet for removing a raffinate stream; a distillation column C for distilling raffinate; and a device for measuring concentration by analyzing a Raman spectrum relating to sampling points, said device having two independent analysis routes, called analysis route 1 and analysis route 2, each of said analysis routes having a main branch operating for a majority of the time and a subsidiary branch operating for a minority of the time, wherein for analysis route 1 the streams that can be sampled are
a) circulation stream sent from adsorber B to adsorber A,b) extract originating from one or other of adsorbers A and B,c) raffinate originating from one or other of adsorbers A and B, wherein for analysis route 2 the fluids that can be sampled are
d) distilled raffinate leaving distillation column C,e) circulation stream from adsorber A to adsorber B,f) feed of the unit at the inlet of one or other of adsorbers A and B,wherein in each of said analysis routes said main branch and said subsidiary branch exhibit mutually exclusive operation, and the main branch of each of said analysis routes is used for the Raman analysis, and the subsidiary branch of each said analysis routes is used for sample collection, and said main branch of each analysis route comprises the following main components taken in the direction of the stream to be analyzed: a shut-off valve (6) making it possible to force the circulation into said subsidiary branch in certain situations, a thermocouple (7) making it possible to take the temperature of the sample to be analyzed, an analysis cell (8) containing an optrode (10), receiving an input laser signal and sending an output signal to the Raman spectrometer, the internal volume of said measurement cell being of the order of 1 cm3, and a second shut-off valve (9) for isolating the analysis cell in the event of maintenance.