Suction pump of the Rotary evaporator?

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Grzegorz Boczkaj

Solvent is volatile - in under pressure conditions it will evaporate in some part to your pump.

Before you turn off the pump - you should first pressurize the system - i.e. open a dedicated valve and allow to get an atmospheric pressure in your system - after that you can turn off the pump.

regards,

Fasan Israel

Well articulated reply and Much appreciation to Dr. Grzegorz.

Thanks

Dr. Grzegorz,

Moreover, that has been done and it didn't prevent the suction of the solvent into the pump and eventually to the oil. Afterward, the pump oil do have the odour of the solvent being recovered. Nonetheless, any other suggestion will be highly appreciated.

Regards

Fasan,

so you need to install a filter before the pump - It could be a column with activated carbon or a crio-condenser.

Secondly - if you don't need a very high vacuum you can replace the oil pump by a simple water pump.

Thanks. Moreover, what type of condenser can I use and i will be very glad if you can send the picture here or to [email protected].

More so, I even added bushner flask immerse in cold water chilled with ice block, just before the pump to further condense the organic vapour. However, the accumulated odour at the pump and the oil just decreased.

Hope, water pump with an outlet to the surrounding might be the best professional advice as suggested.

My sincere regards oncemore.

Sorry I mean filter not condenser.

What can of filter can I use?

Thanks.

Take any column - glass or SS put there activated carbon, connect it inline.

Thanks so far. Moreover, what is the minimum power or rpm of the water pump that is most advisable.

Regards.

Check this one:

https://www.fishersci.co.uk/shop/products/azlon-polypropylene-water-jet-vacuum-pump/11986858

Thanks. However, I guess, the water pump with an outlet to the surrounding medium will be better in application to the foregoing adventure rather than the non return valve as suggested.

Perhaps, the organic vapour under suction, will be released to the surrounding by the water pump, while the one way valve will only and still by pass the organic vapour into the pump.

Nevertheless, any suggestion is highly welcome.

Love you.

............by pass the organic vapour into the present suction pump?

I thought, if there are no water for water pump to suck rather organic vapour, might eventually burn the water pump.

Just curious before buying .

Moreover, any suggested model of water pump will be highly appreciated.