Knitted PTFE Reaction Coils

• Tortuous flow path of optimal flow dynamic design
• Made of inert PTFE
• Minimized axial dispersion combined with efficient radial mixing
• 1/16" OD tubing in a variety of lengths and IDs

Preserved chromotographic peak shape
The Knitted PTFE Reaction coils (KRC) are made from tubing which has been knitted into a tortuous path to force the fast moving centre of the liquid stream to mix radially with the slower moving boundary liquid layer, thereby minimizing the axial dispersion. The shape of a chromatographic peak entering the reactor is thus preserved very efficiently. The KRC is usually the most optimal delay element for use in analytical flow systems. A coil is typically inserted in the flow path to create a delay line, so that a reaction or other event that requires a certain time can take place. Different delay or reaction times are accomplished by changing the inner diameter and length of the KRC, taking the flow rate through the KRC into consideration.
Note: To ensure a stable radial mixing within the KRC, a linear flow rate of 10 cm/sec or more is recommended.

Example application areas
KRC can be applied as a delay line in chromatographic separations. One example is the parallel coupling of a MS detector and a fraction collector in preparative separations (see illustration). The delay time induced by the KRC allows time for detection and therefore an intelligent decision between the fraction collection or waste without loss of chromatographic efficiency. The KRC reactors can also be used in post-column reaction detection in HPLC (see illustration). In this set-up the KRC also ensures thorough mixing between the column effluent and the added reagents.

1/16" Knitted PTFE Reaction Coils
Tolerances: ID and OD: ± 0.05 mm (.002")
Pressure rating: <55 bar (<800 psi)