Patent ID: 6878239

Claim:
A process for inhibiting polymerization in a vacuum section of an easily polymerizable compound purification system, wherein the purification system comprises: a purifying section, including a distillation column and a condenser, and the vacuum section, including a steam ejector and a gas and liquid contact chamber and said vacuum section capable of reducing pressure in said purifying section, said process comprising the steps of: distilling an easily polymerizable compound in the distillation column and condensing the resulting distilled compound in the condenser in the purifying section, permitting an exhaust gas containing the easily polymerizable compound which is not condensed through the condenser, to flow into the gas and liquid contact chamber though said steam ejector in the vacuum section and supplying a liquid containing a polymerization inhibitor to the gas and liquid contact chamber, thereby inhibiting the polymerization in the vacuum section.