Preparation method of carrier silica gel for olefin catalyst
A technology of olefin catalyst and carrier, which is applied in the field of preparation of carrier silica gel, and can solve the problems of expensive solvent, large solvent consumption, difficult recovery, etc.
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Embodiment 1
[0038]Add 20ml of aqueous ammonia solution with a concentration of 1.5mol / L into the closed reactor, turn on the stirring, and slowly raise the temperature to 50°C. Add 1.1mol / L sodium silicate aqueous solution and 1.15mol / L sulfuric acid aqueous solution concurrently with 4ml / min flow velocity, simultaneously add massfraction with 3ml / min flow velocity and be the ethanol aqueous solution 12ml (ethanol and water) of 6% slurry hydrotalcite The volume ratio is 1:8), when the pH value of the solution in the reactor reaches 11, stop adding the mixed aqueous solution, and react at a constant temperature for 2.0h. Add the n-butanol aqueous solution with a concentration of 1.0mol / L at a flow rate of 6ml / min (the volume ratio of n-butanol to water is 1:15), stop adding the n-butanol aqueous solution when the pH value of the solution is 9, and react at a constant temperature for 2.0h . The temperature of the reaction system was raised to 85° C., and the reaction was carried out at con...
Embodiment 2
[0040] The preparation process was the same as in Example 1, except that 15 ml of ammonium bicarbonate aqueous solution with a concentration of 1.8 mol / L was added into the closed reactor, stirring was turned on, and the temperature was slowly raised to 50° C. Add 1.1 mol / L potassium silicate aqueous solution and 1.15 mol / L sulfuric acid aqueous solution in parallel at a flow rate of 4 ml / min. Other conditions are identical with embodiment 1. The test results are shown in Table 1.
Embodiment 3
[0042] The preparation process is the same as in Example 1, except that 1.1mol / L sodium silicate aqueous solution and 2.2mol / L nitric acid aqueous solution are added in parallel at a flow rate of 4ml / min, and a slurry-like solution with a mass fraction of 6% is added at a flow rate of 3ml / min simultaneously. 12ml of ethanol aqueous solution of hydrotalcite (the volume ratio of ethanol to water is 1:8), when the pH value of the solution in the reaction kettle reaches 11, stop adding the mixed aqueous solution, and react at constant temperature for 2.0h. Add n-butanol nitric acid aqueous solution with a concentration of 2.0mol / L at a flow rate of 6ml / min (the volume ratio of n-butanol and water is 1:15), stop adding n-butanol nitric acid aqueous solution when the pH value of the solution is 9, and react at a constant temperature for 2.0h . The temperature of the reaction system was raised to 85° C., and the reaction was carried out at constant temperature for 5.0 h. Add concent...
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