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Olefin oxidizing method

An olefin and oxidant technology, applied in chemical instruments and methods, chemical industry, organic chemistry, etc., can solve the problems of large fluctuations in catalyst activity and selectivity, reduced catalyst activity and selectivity, catalyst deactivation, etc. Effectiveness of utilization, no oxidant residue, high oxidant conversion

Active Publication Date: 2019-04-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] When titanium-silicon molecular sieves are used as catalysts, the common problem is that after a period of operation of the device, the activity and selectivity of the catalyst will decrease, that is, the catalyst will be deactivated during operation.
However, when the regenerated catalyst is put into operation again, especially after being regenerated in the device, the activity and selectivity of the catalyst fluctuate greatly, and it takes a long time to stabilize; at the same time, it is necessary to combine operations such as increasing the reaction temperature To achieve smooth operation of the reaction, but this will further accelerate catalyst deactivation

Method used

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preparation example Construction

[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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Abstract

The invention relates to the field of olefin oxidation, and discloses an olefin oxidizing method. The olefin oxidizing method comprises the step of causing olefin to be in contact with at least one oxidizing agent in a reaction section of a catalytic distillation reactor comprising the reaction section and a stripping section under an oxidation reaction condition, wherein the reaction section is filled with a first catalyst which contains at least one titanium silica molecular sieve; and a part under the reaction section in the catalytic distillation reactor is filled with a second catalyst which contains at least one titanium silica-alumina molecular sieve. The olefin oxidizing method disclosed by the invention can obtain high conversion rate of an oxidizing agent, oxidized olefin selectivity and effective utilization rate of the oxidizing agent, and can fully utilize the latent heat of reaction, so that an oxidation product can be separated from the raw material olefin while reactingwith the raw material olefin, thus, the subsequent separation cost is saved, and energy saving and consumption reduction are realized.

Description

technical field [0001] The invention relates to the field of olefin oxidation, in particular to a method for olefin oxidation. Background technique [0002] Alkylene oxide is an important class of oxygen-containing organic compounds. For example, propylene oxide (also known as propylene oxide) is an important basic organic chemical raw material, and its output is second only to polypropylene among propylene derivatives. The largest use of propylene oxide is to produce polyether polyols for further processing to make polyurethane, and it can also be used to produce propylene glycol which is widely used. In addition, propylene oxide can also be used in the production of surfactants, oilfield demulsifiers, etc. [0003] With the wide application of polyurethane and other materials, the demand for propylene oxide is increasing year by year. However, the current industrial production of propylene oxide still has drawbacks, especially the inability to meet the requirements of gr...

Claims

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Application Information

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IPC IPC(8): C07D303/04C07D301/12B01J29/89
CPCB01J29/89C07D301/12C07D303/04Y02P20/10
Inventor 史春风林民朱斌
Owner CHINA PETROLEUM & CHEM CORP
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