Method for Coating Reactor Surface with Solution Catalyst
A catalyst and reactor technology, applied in the field of solution catalyst coating reactor surface, can solve the problem of not forming polymer, not reliably forming effective and reliable coating, failing to form effective and reliable polymer coating, etc. question
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[0143] It should be understood that while the invention has been disclosed in connection with specific embodiments, the foregoing description is intended to be illustrative and not limiting of the scope of the invention. Other aspects, advantages, and modifications will be apparent to those skilled in the art to which the invention pertains.
[0144] Accordingly, the following examples are disclosed so as to provide those skilled in the art with a complete disclosure and description of how to make and use the compounds of the invention, and not to limit the scope of what the inventors regard as their invention.
[0145] Embodiment 1-conventional method
[0146] In a conventional chromocene process carried out in a commercial polyethylene polymerization reactor system, about 8.2 kg of chromocene as an 8 wt.% solution of chromocene in toluene is sprayed into the reactor while inert gas is circulated through the system. The amount of toluene injected (95kg) will produce a dew ...
Embodiment 2
[0147] Example 2 - Embodiment of the process of the invention including a toluene pre-charge step
[0148] This embodiment was modified from Example 1, wherein the dew point (of the contents of the reactor system) was increased by means of a precharge of 300 kg of toluene into the reactor system prior to introduction of the chromocene solution. 300 kg of additional toluene, together with 95 kg of the chromocene added, resulted in a dew point of 72°C. This is very close to the reactor bulk gas temperature (in the range of 80-90°C) and will therefore provide a much slower drying of the chromocene solution droplets. Drying of the chromocene solution droplets occurs slowly enough that sufficient wetting of the bed walls (and other surfaces of the gas recirculation subsystem) occurs by means of liquid chromocene solution droplets.
Embodiment 3
[0149] Example 3 - Embodiment of the method of the present invention including introduction of a more dilute chromocene / toluene solution
[0150] This embodiment is a variation of Example 1 in which a more dilute solution of toluene in chromocene is introduced into the reactor system. In this example, 8.2 kg of chromocene were likewise added but this was previously mixed with 395 kg of toluene to produce a 2% by weight solution (instead of an 8% by weight solution as in Example 1). Since this is the same amount of toluene added as in Example 2, it will produce the same dew point temperature as in Example 2 (72°C). Thus, the chromocene solution droplets dry slowly enough to produce sufficient wetting of the bed walls (and other surfaces of the recirculation subsystem) by the liquid chromocene solution droplets.
[0151] Carrying out the method of either of Examples 2 and 3 increases the gas dew point temperature in the reactor (due to the presence of additional toluene). As...
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