Preparation method of alkene epoxidation catalyst as well as catalyst prepared thereby

An epoxidation and catalyst technology, applied in catalyst activation/preparation, metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, etc., can solve the complicated preparation process, long reaction time, harsh conditions, etc. problems, to achieve the effect of improving epoxidation selectivity, improving carbon deposition resistance, and reducing surface acidity

Active Publication Date: 2018-04-20
WANHUA CHEM GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Both the vapor deposition method and the sol-gel method have the following disadvantages: the preparation process is cumbersome, the operation is complicated, the conditions are harsh and difficult to control, and the reaction time is long.
In addition, once the conditions are not properly controlled, the resulting catalyst is likely to generate more extra-skeletal titanium compounds (mainly free titanium dioxide), the surface of the catalyst is more acidic, and the effective utilization rate of organic peroxides is lower when used in the epoxidation of propylene.
[0008] In summary, the current conventional microporous titanium-silicon molecular sieves are too small for C 6 The above macromolecular olefin epoxidati

Method used

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  • Preparation method of alkene epoxidation catalyst as well as catalyst prepared thereby
  • Preparation method of alkene epoxidation catalyst as well as catalyst prepared thereby
  • Preparation method of alkene epoxidation catalyst as well as catalyst prepared thereby

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0056] The structure of the catalyst prepared in Example 1 was determined by an X-ray diffractometer. The instrument is produced by PANalytical, the model is X’pert 3 powder.

[0057] 3. Confirmation of alkali metal modification and content

[0058] The catalyst prepared in each example and comparative example was subjected to XRF analysis to confirm whether the alkali metal element modification process in step (3) was realized and the content of the alkali metal element. The instrument is produced by Shimadzu Corporation of Japan and the model is EDX-LE.

[0059] 4. Silanization modification and confirmation of silyl group content

[0060] The catalysts prepared in Example 1 and Comparative Example 3 were subjected to thermal analysis using a scanning calorimeter to obtain a DSC curve, thereby confirming whether the silanization modification process in step (4) was realized. The scanning calorimeter is produced by METTLER TOLEDO, and the model is DSC1 professional.

[0061] The sily...

Example Embodiment

[0092] Example 2

[0093] Titanium silica gel was prepared according to Example 1, except that 20g of ethylenediamine liquid was added during the hole-expanding process, treated at a constant temperature of 90°C for 10 hours, then dried at 120°C for 3 hours, and baked at 550°C for 3 hours to obtain titanium-silicon composite oxide The specific surface area is 368m measured by BET 2 / g, the average pore size is 10.7nm. Then, the catalyst B was prepared by alkali metal modification and gas phase silanization treatment under the same conditions as in Example 1.

Example Embodiment

[0094] Example 3

[0095] Titanium silica gel was prepared according to Example 1, except that 20g of high-purity liquid ammonia was added during the hole-expanding process, treated at a constant temperature of 150°C for 12h, then dried at 160°C for 3h, and baked at 550°C for 3h to obtain titanium-silicon composite oxide The specific surface area measured by BET is 322m 2 / g, the average pore size is 18.3nm. Then, under the same conditions as in Example 1, a catalyst C was prepared by alkali metal modification and gas phase silanization treatment.

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Abstract

The invention relates to a preparation method of an alkene epoxidation catalyst. The preparation method of the alkene epoxidation catalyst comprises the following steps: (1) preparing titanium silicongel; (2) performing pore-enlarging treatment on the titanium silicon gel by using organic amine or liquid ammonia, drying and roasting to obtain titanium silicon composite oxide; (3) optionally performing alcohol solution treatment on organic alkali metal salt; and (4) optionally performing gas phase silanization treatment. The pore diameter of the catalyst prepared by the method is adjustable, so that the catalyst has higher activity on epoxidation reaction of olefin molecules with different kinetic diameter; and the catalyst is subjected to two-step modification, the surface acidity of thecatalyst is effectively reduced and the catalyst has higher epoxidation product selectivity.

Description

technical field [0001] The invention relates to a preparation method of an olefin epoxidation catalyst, in particular to a preparation method of a titanium-silicon composite oxide catalyst. The invention also relates to the olefin epoxidation catalyst prepared by the preparation method and its application in olefin epoxidation. Background technique [0002] For chemicals such as epoxy resins, surfactants, coatings, adhesives, and surface coating reagents that are widely used in life and industry, epoxy compounds are a class of general-purpose intermediate raw materials for the synthesis of these chemicals and have great potential. demand. The traditional production process of synthesizing epoxy compounds is generally chlorohydrin method or co-oxidation method, but this kind of method has the disadvantages of heavy pollution, large corrosion of equipment, many by-products, and high cost. [0003] Therefore, many companies at home and abroad are devoting themselves to the de...

Claims

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Application Information

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IPC IPC(8): B01J21/08B01J23/04C07D301/19C07D303/04B01J35/10
CPCC07D301/19C07D303/04B01J21/08B01J23/04B01J35/1019B01J35/1061B01J21/063B01J37/0201B01J37/033B01J37/0018B01J2229/32B01J37/04B01J37/088
Inventor 王同济叶飞王磊初乃波杨立超孙康黎源华卫琦
Owner WANHUA CHEM GRP
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