GC System with Back-flushing Pre-Column Injector
Are You Analyzing Unnecessary High-Boiling-Point Components?
This system retains and eliminates unnecessary high-boiling-point components in the pre-column to reduce analysis times.
System Flow Diagram
Sample Analysis Data: Impurity analysis in diisobuthyl hexahydrophthalate (DIBE, CAS 70969-58-3)
An analysis time of 28 minutes is required if the unnecessary DIBE is not precut and back-flushed (left diagram below). However, the analysis can be completed with the elution of the target citraconic anhydride (2-methyl maleic anhydride, CAS 616-02-4) in just 16 minutes if the unnecessary DIBE is precut (right diagram below).
An analysis time of 28 minutes is required if the unnecessary DIBE is not precut and back-flushed (left diagram below). However, the analysis can be completed with the elution of the target citraconic anhydride (2-methyl maleic anhydride, CAS 616-02-4) in just 16 minutes if the unnecessary DIBE is precut (right diagram below).
Features
Reduced analysis times
To reduce analysis time, this system retains and eliminates unnecessary high-boiling-point components in the pre-column and sends only the target components to the capillary column, back-flushing the “heavies” to vent.
Stops deterioration of capillary columns
Not introducing the unnecessary high-boiling-point components into the capillary column prevents deterioration of the column.
Allows highly accurate analysis
Digital pressure control and autoinjector significantly enhance the reset-ability of conditions to permit highly accurate analysis.
Table 1: Compounds Mentioned in this Document
Name
Cas Reg. Nr.
Structure
diisobuthyl hexahydrophthalate,
1,2-Cyclohexanedicarboxylicacid,
1,2-bis(2-methylpropyl) ester70969-58-3
citraconic anhydride, 2-methyl maleic anhydride
616-02-4
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