A kind of method of olefin oxidation
An olefin and oxidant technology, applied in chemical instruments and methods, organic chemistry, chemical industry, etc., can solve the problems of catalyst deactivation, catalyst activity and selectivity reduction, catalyst activity and selectivity fluctuations, etc., to achieve no oxidant. Residuals, achieve the effect of saving energy and reducing consumption, and improving the effective utilization rate
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[0023] In a preferred embodiment of the present invention, the preparation method of the shaped first catalyst comprises: under hydrolysis reaction conditions, at least one organosilicon compound capable of hydrolysis reaction and at least one water-soluble base and water Contacting, mixing the contacted mixture with titanium-silicon molecular sieves, and successively molding and roasting the obtained mixture containing titanium-silicon molecular sieves. The shaped first catalyst obtained according to this embodiment not only has higher strength and thus is more resistant to wear and crushing, the bed containing the catalyst has a higher resistance to collapse; and it is possible to obtain Higher oxidant conversion and oxidized olefin selectivity.
[0024]In this preferred embodiment, the amount of the organosilicon compound, the water-soluble base and the titanium-silicon molecular sieve should be used to form the titanium-silicon molecular sieve, and the amount of water shou...
Embodiment approach A
[0045] Therefore, according to a preferred embodiment A of the present invention, the titano-silicon-alumina molecular sieve is prepared according to the following steps:
[0046](1) Mix the unloading agent with the organic acid solution for beating, and perform the first heat treatment on the obtained slurry to separate and obtain the first solid with a relative crystallinity of 70-90%, wherein the unloading agent is obtained from titanium silicon Molecular sieve is discharged from the reaction device as the active component of the catalyst;
[0047] (2) The second heat treatment is performed after mixing the first solid, the aluminum source, the optional titanium source and the alkali source in the presence of an aqueous solvent. Wherein, the titanium source is a selectively used component.
[0048] In the preferred embodiment A of the present invention, the unloading agent of the reaction device using titanium-silicon molecular sieve as the catalyst active component can be...
Embodiment approach B
[0080] The inventors of the present invention further found that if the deactivated silica-alumina molecular sieve is contacted with an organic acid, etc., a titanium-silicon-alumina molecular sieve with better olefin oxidation effect can also be obtained. Therefore, according to another preferred embodiment B of the present invention, The titano-silicon-alumina molecular sieve is prepared according to the following steps:
[0081] (a) mixing the unloading agent with the organic acid solution for beating, and subjecting the resulting slurry to a first heat treatment to separate and obtain a first solid with a relative crystallinity of 50-70%, wherein the unloading agent is obtained from silica-alumina Molecular sieve is discharged from the reaction device as the active component of the catalyst;
[0082] (b) performing a second heat treatment after mixing the first solid, optional aluminum source, titanium source and alkali source in the presence of an aqueous solvent. Wherei...
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