Method of transferring polymerizable liquid and apparatus for transfer
A subject for the invention is to provide a method of transferring a polymerizable liquid by which the polymerizable liquid can be stably transferred without arousing any mechanical-seal trouble over long. The method of transferring a polymerizable liquid utilizes a pump which has a mechanical seal having seal faces and has a flushing liquid line for supplying a flushing liquid to a flushing liquid introduction opening of the mechanical seal, wherein the flushing liquid line is equipped with a strainer, a device for adding a polymerization inhibitor, or a flushing liquid cooler.
1. A method of transferring a polymerizable liquid with a pump having a rotatable horizontal shaft and a mechanical seal, which comprises:
providing a flushing liquid line for supplying a flushing liquid to the mechanical seal, the flushing liquid line comprising a strainer, a device for adding a polymerization inhibitor, or a flushing liquid cooler, and
forming said mechanical seal by spacing a stationary seal and a rotary seal so as to engage one another and so as to be spaced from said horizontal shaft.
2. The method of transferring a polymerizable liquid as claimed in claim 1 , wherein the flushing liquid cooler is a heat exchanger.
3. The method of transferring a polymerizable liquid as claimed in claim 1 or 2 , wherein the polymerizable liquid is a compound containing an ethylenic double bond.
4. The method of transferring a polymerizable liquid as claimed in claim 3 , wherein the compound containing an ethylenic double bond is (meth)acrylic acid or an ester thereof, styrene, or acrylonitrile.
5. The method of transferring a polymerizable liquid as claimed in claim 1 , wherein the strainer is a 20- to 200-mesh strainer.
6. The method of transferring a polymerizable liquid as claimed in claim 1 , wherein the polymerization inhibitor is at least one member selected from phenol compounds, N-oxyl compounds, phenothiazine compounds, and copper compounds.
7. The method of transferring a polymerizable liquid as claimed in claim 1 , wherein the flushing liquid to be supplied to the mechanical seal has a temperature of 100° C. or lower.
8. The method of transferring a polymerizable liquid as claimed in claim 1 , wherein the flushing liquid is a polymerizable liquid of the same kind as the polymerizable liquid to be transferred.
9. The method of transferring a polymerizable liquid as claimed in claim 1 , which comprises mounting said shaft and said rotary seal on a slide sleeve.
10. An apparatus for transferring a polymerizable liquid, which comprises:
a pump having a rotatable horizontal shaft,
a mechanical seal and a flushing liquid line for supplying a flushing liquid to the mechanical seal, wherein the flushing liquid line is equipped with a strainer, a device for adding a polymerization inhibitor, or a flushing liquid cooler and wherein said mechanical seal comprises a stationary seal and a rotary seal and which engages with said stationary seal, each said rotary seal and stationary seal being spaced from said horizontal shaft.
11. An apparatus as claimed in claim 10 , which comprises a slide sleeve on which is mounted said shaft and said rotary seal.