Preparation method of carrier silica gel for olefin catalysis
A technology of carrier and silica gel, which is applied in the direction of catalyst carrier, catalyst activation/preparation, chemical instruments and methods, etc. It can solve the problems of long time for distilling and removing water, large solvent consumption, cumbersome operation steps, etc., and improve pore volume and distribution , Simple preparation and operation, good repeatability
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Embodiment 1
[0036]Add 50ml of water glass aqueous solution with a concentration of 1.2mol / L into the reaction kettle, turn on the stirring, and raise the temperature to 50°C. Add 1.1mol / L sodium silicate aqueous solution and 1.25mol / L sulfuric acid aqueous solution concurrently with 4ml / min flow velocity, simultaneously add the ethanol aqueous solution that mass fraction is 6% sodium carbonate (volume ratio of ethanol and water is 1:6) and 25ml of a mixed aqueous solution of magnesium nitrate and aluminum nitrate with a mass fraction of 4% (the molar ratio of the two nitrates is 1:1). When the pH value of the solution in the reactor reaches 11, stop adding the above mixed solution and keep the temperature Reaction 2.0h. Add n-butanol sulfuric acid 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 n-butanol sulfuric acid solution when the pH value of the solution is 9, and react at constant temperature ...
Embodiment 2
[0038] The preparation process is the same as in Example 1, except that 50 ml of potassium silicate aqueous solution with a concentration of 1.2 mol / L is added into the reaction kettle, stirring is started, and the temperature is raised to 50°C. Add 1.1mol / L potassium silicate aqueous solution and 1.25mol / L sulfuric acid aqueous solution concurrently with 4ml / min flow velocity, simultaneously add the ethanol aqueous solution that mass fraction is 6% potassium carbonate (volume ratio of ethanol and water is 1:6). Other conditions are identical with embodiment 1. The test results are shown in Table 1.
Embodiment 3
[0040] The preparation process is the same as in Example 1, except that 1.1mol / L sodium silicate aqueous solution and 1.3mol / L nitric acid aqueous solution are added in parallel at a flow rate of 4ml / min, and 6% sodium carbonate is added in parallel with a mass fraction of 5ml / min. ethanol aqueous solution (volume ratio of ethanol and water is 1:5) and 25ml of mixed aqueous solution of zinc nitrate and aluminum nitrate (the molar ratio of two nitrates is 1:1.2) with a mass fraction of 4%, when the pH value of the solution in the reactor reaches At 11 o'clock, stop adding the above mixed solution, and react at constant temperature for 2.0 hours. Add n-butanol nitric acid 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 1:10), stop adding n-butanol nitric acid solution when the pH value of the solution is 9, and react at constant temperature for 2.0h . The temperature of the reaction system was raised to 85° ...
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