Ground-glass apparatus

This brief account is intended to give only a general indication of the types of apparatus available. The firm which has pioneered the design and manufac ture of ground- glass apparatus is Quickfit and Quartz, Ltd., Quickfit Works,... 

All reactions are routinely carried out under an inert atmosphere and in a well-ventilated fume hood. Standard ground glass apparatus is used throughout. 

Ground glass apparatus must be used as the amine attacks rubber (and cork). Since the product absorbs carbon dioxide from the air, attach the receiving flask to the condenser with a take-off adapter carrying a soda-lime guard-tube. 

Sulfur vapor mixed wlthHgispassed over pure Be at a ten era-ture of about 1150°C. The ground glass apparatus, shown in Fig. 

The product is distilled through an 18-in. Vigreux column. The fraction boiling between 115 and 116° at 735 mm. amounts to 65 per cent of the crude product. Since chromyl chloride reacts with stopcock grease and has a tendency to cause glass joints to stick, ground-glass apparatus is not recommended for this distillation. 

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