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AssigneeAtochem
InventorsPaul Laroche, Jean-Bernard Pompon, deceased, by Marvonne Pompon, heir, by Laurence Pompon, heir, by Christophe Pompon, heir, by Lucie Pompon, heir
Estimating the term…
An aqueous coating solution is sprayed into the interior of the reactor. After the aqueous coating solution has been sprayed, steam is injected and condensed within the reactor. Upon polymerizing a vinyl chloride-base monomer composition in the reactor after having been treated, the formation of deposits of polymer on the internal surfaces of the reactor is substantially reduced and even suppressed.
A process for inhibiting the formation of polymer deposits in a polymerisation reactor comprising spraying an aqueous coating solution containing a resin extracted from pine wood within said reactor and than injecting and condensing steam within said reactor.
A process according to claim 2 wherein the aqueous coating solution contains from 1 to 10% by weight of resin extracted from pine wood.
Dependencies are inferred from the claim text.
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No related US applications are recorded in the indexed filing history.
Fixed-bed gasification of lump fuel: apparatus; Plants
Chemical, physical or physico-chemical processes in general; Their relevant apparatus: stationary reactors having moving elements inside
The gas being a non-reacting gas: for heating, e.g. vapour heating
To internal surfaces, e.g. of tubes: of containers, cans or the like
Term ended 22 Mar 2005 (estimated)
USPTO file history isn’t available for this patent, so only indexed dates are shown.
The present invention concerns a process for treating a polymerisation reactor. It also concerns the polymerisation reactor when treated by that process.
An aim of the present invention is substantially to reduce the formation of deposits of polymer on the internal surfaces of a polymerisation reactor when a vinyl chloride-base monomer composition is polymerised in the reactor.
Other aims and advantages will be clearly apparent from the following description.
A description of two embodiments of equipment which are particularly suitable for carrying out the process according to this invention is set out below by way of example and with reference to FIGS. 1 and 2 of sheets I and II of drawing attached.
FIGS. 1 and 2 are vertical cross-sectional views of a polymerisation reactor and the apparatus used for treating the reactor.
Referring to FIG. 1, the apparatus comprises two totally independent circuits. One circuit which is supplied with gas is provided to carry out the step of spraying the aqueous coating solution, using the gas as a propellant fluid. The other circuit which is supplied with steam serves to inject steam after the operation of spraying the aqueous coating solution.
Referring to FIG. 2, the apparatus illustrated therein comprises a single circuit. The circuit which is supplied with steam serves to carry out both the aqueous coating solution spraying step, using the steam as the propellant fluid, and the steam injection step after the aqueous coating solution has been sprayed in the reactor.
As shown in FIGS. 1 and 2, the apparatus comprises a tank 1 containing the amount of aqueous coating solution to be sprayed and a full cone type spray nozzle 2 connected to the tank 1 by a conduit 3. The tank 1 is connected in its upper part to a source (not shown) of aqueous coating solution by means of the conduit 4 and to a propellant fluid source (not shown) by a conduit 5 provided with an expansion valve 6. An air venting conduit 7 is connected to the tank 1.