An apparatus 110 for carrying out a chemical reaction comprising an elongate housing 112 and a receptacle 114, e.g. polyethylene film. The elongate housing 112 includes a cooling means 116 and fittings 118, 120 which include ports via which fluids may be introduced and/or removed. In use of the apparatus 110, a chemical reaction product is formed within the receptacle 114. Subsequently the receptacle 114 containing the chemical reaction product is withdrawn from the elongate housing 112.
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