Method for regulating a process for the separation of isomers of

Details Method for regulating a process for the separation of isomers of Method for regulating a process for the separation of isomers of

1994-06-29

1996-10-29

Pal, Asok

Chemistry of hydrocarbon compounds

Purification, separation, or recovery

585812, 422 8205, 422 8209, 356301, C07C 700

Patent

active

055698085

ABSTRACT:
A monochromatic light signal of a wavelength of between 400 and 1300 nanometers is simultaneously passed by a source 1, a beam splitter 2 and optical fibers 3, 3a to at least two points of a zone 9 for the separation of a mixture of isomers and aromatic hydrocarbons having from 8 to 10 carbons atoms. A polychromatic signal is recovered corresponding to the Raman effect between 400 and 3500 cm.sup.-1 by optical receiving fibers 5, 5a connected to sensors 4 at the locations of said points. The chemical composition of the mixture is determined from the Raman spectra obtained by a spectrometer 6. The analysis sequence is repeated, the profiles with respect to the concentration of the isomers in the mixture are reconstituted and by comparison with reference concentration profiles, action is taken on at least on operational variable 11, 12 of the separation process. Application of this process to the regulation of simulated mobile beds, a distillation operation or a crystallization process for obtaining paraxylene or orthoxylene are also provided.

REFERENCES:
Roberts et al., "Development and Application of a Raman Spectroscopy, . . . " 8131 Advances in Instrumentation and Control 45(1990) Part 1, pp. 463-468.
Garrison et al., "Raman Spectroscopy for On-Line Distillation Process Control", 8131 Advances in Instru. & Control, 44(1989) Part 1, pp. 357-363.
Angel et al., "Simultaneous Multi-point Fiber-optic Raman Sampling . . . " SPIE vol. 1587 Checm., Biochem. & Environ. Fiber Sensors III(1991)219-231.
Wei, Chiu-Nan, "Diagnose Process Problems", Chemical Engineering Progress Sep. 1991, 70-74.
Balannec et al., "From Batch Elution to Simulated Countercurrent Chromatography", Preparative and Production Scale Chromatography, pp. 301-357. No Date.

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