Method of preparing a catalyst
A catalyst, aspect technology, new method applied in agent. field
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[0060] Having generally described the subject matter of the present disclosure, the following examples are given as specific embodiments of the present disclosure and for demonstration of its practice and advantages. It should be understood that the examples are given by way of illustration and are not intended to limit the specification or the claims that follow in any way.
example 1
[0062] Example Catalysts A and B were prepared by activating ES370X, a chromium on silica catalyst available from PQ Corporation, in a laboratory catalyst activator to a final hold temperature of 650°C. Exemplary Catalyst A, an HMC of the type disclosed herein, was prepared by calcining approximately 50 mL of ES370X in dry air (1.2-1.4 scfh, about 11 to 23 bed changes per minute) to temperatures up to 400°C in dry air, The Exemplary Catalyst A was then activated by calcination at 4°C / min to 650°C for 3 hours in dry air (about 1.2 scfh) to form an active catalyst. Comparative Example Catalyst B was prepared by calcining about 200 mL of ES370X in dry air (about 0.4 scfh, about 0.9 to 1.9 bed changes per minute) to temperatures up to 400 °C in dry air, and then The Comparative Example Catalyst B was activated by calcination at 4°C / min to 650°C at about 0.4 scfh) for 3 hours to form an active catalyst.
[0063]The catalyst is then used to make the polymer. Polymerization runs we...
example 2
[0067] Exemplary catalysts C, D and E were prepared as follows:
[0068] Fifteen pounds of silica was charged to the reactor followed by chromium acetate dissolved in methanol. Methanol was removed by distillation and the silica was dried at 165°C. After cooling, chromated silica was slurried in heptane, to which was added Ti(OnPr) 4 (Enough to get 3.0 wt.% Ti). The titanated-chromated silica was heated under very low nitrogen flow (-0.03 bed changes per minute) to remove heptane and other volatiles. Comparative Example Catalyst C was dried at a final temperature of 160°C (under a nitrogen flow of about 0.03 bed changes per minute), but when the drying temperature reached 115°C, a sample was collected (Example Catalyst D, an HMC of the type disclosed herein ). Example Catalyst E, an HMC of the type disclosed herein, was dried at a final temperature of 120°C. Approximately 50 mL of Exemplary Catalyst C was then activated by calcination in dry air (1.2-1.6 scfh) at 4°C / min ...
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