CORROSION RESISTANT LINERS - REACTION VESSELS

Three basic methods can be employed to protect

SUPERPRESSURE

1. Vessels and accessories may be built entirely of corrosion-resistant metals and alloys.
2. Removable Pyrex liners.
3. Permanent metal liners.

PERMANENT LINERS

Pyrex liners have been used widely and are now considered essential equipment for high-pressure laboratories. Since catalytic effects are important in high-pressure processes, Pyrex liners are often used in exploratory research.

In use, liner is removed from the reaction vessel, charged, and inserted in the vessel, which is then closed.

Each Pyrex liner is fitted with a ground-glass stopper containing a thermowell guard.

Suitable springs are supplied with all removable liners to keep them snug in the reaction vessel.

The Pyrex liner contains a small vent hole which serves as a pressure equalizer to allow the heavy walls of the reaction vessel (not the liner) to take the pressure load. Since removable liners are used chiefly in shaking-type reaction vessels, this pin hole is located midway between the ends of the liner, so that if the liner is placed horizontally in the shaker with the pin hole upward, liquid will not splash out during shaking. This pin hole precludes the possibility of filling the liner more than half full if liquid is not to leak out during filling.