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Genevac: Safe Evaporation of Solutions Containing Hydrochloric Acid

hits:507     Date:10/13/17

Genevac has published a technical paper that reviews a selection of organic synthesis / purification reactions widely used by chemists in the drug discovery process where hydrochloric acid (HCl) has to be removed post reaction.  In addition the paper discusses solutions to the problems which routine evaporation of concentrated HCl can create.

Caption:  HCl resistant EZ-2 centrifugal evaporator

When synthesising and purifying organic molecules, hydrochloric acid (HCl) can be a very useful reagent for instance for t-BOC deprotection of amines, preparing acid chlorides and re-salt formation  Its preferential use over other mineral acids (that can produce undesirable side effects) and trifluoroacetic acid (that may leave unwanted fluoroacetate groups behind) is well established in scientific literature.  However the removal of excess acid from samples can be problematic especially when working with samples in parallel as most commercial centrifugal evaporators contain non-glass components that are degraded by concentrated HCl.

Caption:  t-BOC deprotection using HCl

In applications where HCl is either used as a reagent or it is generated in the reaction, care must be taken when evaporating samples. For labs handling single samples containing HCl, they are often dried in a rotary evaporator in which the majority of the wetted components are made of glass and are therefore resistant to acid attack. The author describes how users of rotary evaporators should check that their fume extraction system can safely accommodate HCl vapours or else costly damage may result.  Additionally, users should ensure that the vacuum pump outlet pipe is correctly fitted and does lead vapours away safely, otherwise the HCl vapours may be drawn into the vacuum pump motor increasing its likelihood of early failure.

Traditionally there have been problems associated with using evaporators for removal of HCl from multiple samples in parallel where even low concentrations of the acid can cause corrosion leading to system failure.  The author describes how these problems have been resolved by development by Genevac of a range of optimised HCl resistant centrifugal evaporators containing wetted components made from suitable acid resistant steels, coatings and elastomers enabling chemists to use HCl in reactions and not compromise on their preferred organic synthetic route pathway.

To download a copy of the 鈥楽trategies for Safe Evaporation of Solutions Containing Hydrochloric Acid鈥 paper please visit www.spscientific.com/Articles-And-Technical-Papers. For further information on HCl resistant centrifugal evaporators please visit www.spscientific.com/ContentBlock.aspx?id=3507 or contact Genevac on +44-1473-240000 / +1-845-255-5000 / salesinfo@genevac.co.uk.

Genevac, part of SP Scientific and located in Ipswich, UK, offers a comprehensive portfolio of evaporators to suit almost any solvent removal application, purchasing budget or productivity requirement. SP Scientific is a leading manufacturer of centrifugal evaporators and concentrators, freeze drying / lyophilisation, temperature control/thermal management, glassware washers, controlled environments, vial washing and tray loading machines. The company sells its products under well-known brands including Genevac, VirTis, Hull, FTS Systems, Hotpack and the recently acquired PennTech. SP Scientific has ISO 9001:2015 registered production facilities in Europe and ISO 9001:2008 registered facilities in the USA.

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Further Information:

Genevac Ltd.
Farthing Road
Ipswich IP1 5AP
UK

tel. +44-1473-240000
email robert.darrington@genevac.co.uk
www.genevac.com

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SP Scientific
3538 Main Street
P.O Box 158
Stone Ridge
NY 12484
USA

Tel: +1.845.687.5315
e: shireen.scott@spscientific.com
www.spscientific.com

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Media

Dr Bill Bradbury    Primetek Solutions
+44-208-546-0869  /  info@primetek-solutions.com

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