What is the maximum number of samples that can be evaporated using the GreenHouse Blowdown?

The GreenHouse Blowdown evaporates samples by blowing inert gas through pins onto your samples – one pin per sample. There are three types of pin plate available:
  • RR99672: GreenHouse Long Blowdown Pin Plate 6 x 4
  • RR99673: GreenHouse Blowdown Pin Plate 6 x 4
  • RR99674: GreenHouse Blowdown Pin Plate 4 x 2
The maximum number of samples is therefore 24.  You can use the long or short pin plates as appropriate for your sample volumes / vessels.

Which vial rack and pin plate should I use in GreenHouse Blowdown?

We offer the following vial racks and pin plates for use with the GreenHouse Blowdown Evaporator:
  • RR99691: AT01 Vial Rack 4 x 2 (For 27.8 mm OD Vials)
  • RR99692: AT02 Vial Rack 6 x 4 (For 13 mm OD Vials)
  • RR99693: AT03 Vial Rack 6 x 4 (For 13.8 mm OD Vials)
  • RR99695: AT05 Vial Rack 4 x 2 (For 24.3 mm OD Vials)
  • RR99696: AT06 Vial Rack 6 x 4 (For 15 mm OD Vials)
  • RR99697: AT07 Vial Rack 4 x 2 (For 23.8 mm OD Vials)
  • RR99672: GreenHouse Long Blowdown Pin Plate 6 x 4
  • RR99673: GreenHouse Blowdown Pin Plate 6 x 4
  • RR99674: GreenHouse Blowdown Pin Plate 4 x 2
Firstly, choose a vial rack appropriate for your vial size. The descriptions state the maximum vial outer diameter; 1 mm smaller is fine too. For a 4 x 2 vial rack, you will need the 4 x 2 pin plate (part number RR99674). For the 6 x 2 vial racks, you can choose between a pin plate with long pins (RR99672) or short pins (RR99673). The appropriate pin plate for you depends on your vial height and sample volume – you want the pins to reach inside the vials, but not to be immersed in the sample. Please contact us with details of your vials and samples for further guidance.

What is the GreenHouse Blowdown condenser? How do I connect it? How big is it?

The GreenHouse Blowdown condenser (part number RR99684) is an accessory for the GreenHouse Blowdown Evaporator.  It is commonly used together with a receiving flask (part number RR99688). It is a dry ice condenser – you add dry ice / acetone into the central chamber. You use tubing to connect the gas outlet of the GreenHouse Blowdown to the condenser. Vapours then pass into the outer jacket of the condenser, are condensed by the dry ice in the middle, and drip down into the receiving flask.  Evaporating solvent is therefore collected. The total height of RR99684 and RR99688 is around 53 cm (not counting any space below it). The dimensions of the overall GreenHouse Blowdown system depend on how/where you are planning to clamp the condenser.  We can supply stands/clamps if required, including hotplate accessories.

What tubing do I need for GreenHouse Blowdown?

For the GreenHouse Blowdown Evaporator, you require suitable tubing:
  • To connect the inert gas (nitrogen) source to the gas inlet of the GreenHouse Blowdown Head (preferably via the Flowmeter, part number RR99680)
  • To connect the gas outlet of the GreenHouse Blowdown Head to the GreenHouse Blowdown condenser (part number RR99684 – accessory).
We recommend:
  • RR99681: Gas Connection Tubing – 5 m length

What is the maximum sample volume that can be evaporated in GreenHouse Blowdown?

The largest sample volumes are possible in the 4 x 2 vial racks:
  • RR99691: AT01 Vial Rack 4 x 2 (For 27.8 mm OD Vials)
  • RR99695: AT05 Vial Rack 4 x 2 (For 24.3 mm OD Vials)
  • RR99697: AT07 Vial Rack 4 x 2 (For 23.8 mm OD Vials).
The exact maximum sample volume possible will depend on the specific vial type used, such as its internal diameter and whether it has a conical inner.  The pins should not be immersed in the sample, so this limits the fill volume of vials.  Our internal data indicates that a fill volume of up to around 17-18 ml (x 8 positions) should be possible with these vial racks.

Greenhouse Blowdown large vials

What temperature should I use GreenHouse Blowdown at?

Usually, 40°C is suitable.  This does not normally cause product decomposition. Nonetheless, this temperature may be reduced for less thermally stable compounds, or increased for high boiling solvents (the maximum recommended operating temperature being 150°C).