Parr offers two styles of condensers for attachment to the head of a stirred reactor or pressure vessel. These can be made in various sizes to match the size of the reactor.

Reflux Condenser

The reflux condenser consists of a length of tubing connected directly to the head of a vessel and equipped with a water cooling jacket. Condensed vapors are returned directly to the vessel and any non-condensable gases can be released through a needle valve at the top of the condenser. A helical insert in the condenser ensures maximum effectiveness in a rather short length.

Reflux/Take-Off Condensers

The reflux/take-off condenser consists of a water jacketed tube, the same as described above, assembled with a receiving vessel attached to the lower end of the condenser. Any vapor, such as water from a polymerization reaction, can be condensed and collected in the receiver, from which it can be withdrawn through a bottom valve. Any non-condensable gases can be released through a needle valve at the top of the condenser. If condensate collection is not required, the receiver can be removed and the condenser can be mounted directly above the reactor for direct reflux into the vessel.


Many users opt to install a ball valve at the head of the reactor below the condenser to use as a shut-off to the condenser. Alternate collection vessel volumes are available upon request.

The installation of a condenser on any of the Parr reactors requires a larger port in the head of the vessel, the size of which will vary with the volume of the reactor system. Due to the limited space on the 4560 mini reactors we would change either the gage opening or one of the cooling coil ports to 1/4″ NPT for use with a condenser. This modification would then either combine the gage and condenser functions or eliminate the internal cooling loop to accommodate the condenser. Reactors with volumes of 1 liter and greater would be modified with a 3/8″ NPT opening or larger depending on the reactor volume. The standard head fittings would be rearranged to accommodate this port.

ReactorStyleNoteInner Tube OD Diameter, in.Standard Receiver, mLPart No.
4560/4590Reflux/Take-offMod. Gage Opening 1/4″ NPT3/8150A2011HC
4560/4590RefluxMod. Gage Opening 1/4″ NPT3/8A2012HC
4560Reflux/Take-offMod. Cooling Coil Opening 1/4″ NPT3/8150A2013HC
4560RefluxMod. Cooling Coil Opening 1/4″ NPT3/8A2014HC
4520/4530/4550Reflux/Take-off3/8″ NPT1/2300A2001HC
4520/4530/4550Reflux3/8″ NPT1/2A2002HC
4530 MD*Reflux/Take-off3/8″ NPT1/2300A2003HC
4530 MD*Reflux3/8″ NPT1/2A2004HC
4540/4570/4580Reflux/Take-off3/8″ NPT3/8300A2016HC
4540/4570/4580Reflux3/8″ NPT3/8A2017HC
4555Reflux/Take-off1/2″ NPT3/41000A2018HC
4555Reflux1/2″ NPT3/4A2019HC
* with Mag Drive


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