Vulcan Series Chloride Removal Technology VGP CRT 2000 and ...

10.0 Re-contactor / Separation Drum
This stage will basically determine whether the fixed bed HCl trap downstream will
perform or not. The idea is to operate as to minimize the 'heavies' content of the net
hydrogen ex catalytic reformer. This is done via the highest pressure and lowest
temperature possible at this stage. It would be good to have the separation drum running
at a temperature lower than ambient. This is seldom achieved mostly because existing
plant has not been designed with the optimum operation of HCl absorbers in mind.
Vulcan Series VGP CRT 2000 / 3000: Analytical Procedures
What analytical methods are used to measure chloride concentrations in vapor and liquid
phases down to 0.1-ppm levels? Do you have any specific information (i.e. analyzer type
etc.) on these methods?
For detection of chlorides in liquid hydrocarbon streams we recommend the following
methods:
For detection of inorganic chlorides
Use of silver nitrate back titration on the water washings of a known quantity of the
hydrocarbon liquid. Full details are available on request from GBHE C 2 PT.
GBHE C 2 PT experience indicates that this type of analysis is reliable for detecting ppmv
quantities of inorganic chlorides but less reliable for sub-ppmv levels. Thus it is OK for
quick, regular checking that the chloride has not broken through the bed.
For detection of organic and inorganic chlorides
Use a GC and Hall detector system. The GC system splits up the different types of
chloride so that they can be separately identified by the Hall detector. The Hall detector
converts all the chlorides present to HCl (H2 is added) and this is then specifically
detected by the Hall detector (which is a conductivity cell).
The detector/GC system typically costs about $ 45,000 and can be supplied by the
American company Varian.
For detection of organic chlorides - Solids & Liquids
.
Total Organic Halogen Measurement System
Model TOX - 10 ( AOX /POX/EOX )
Mfgr. by: Mitsubishi Kasei Corp.
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