Epoxidation catalyst preparation method and prepared epoxidation catalyst thereof, and applications of epoxidation catalyst

A catalyst and epoxidation technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of low reactivity of titanium-based catalysts and achieve improved Stability, the effect of high hydrothermal stability

Active Publication Date: 2017-07-21
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] EP0345856A1 discloses a preparation method of a titanium-based heterogeneous catalyst and its application in propylene epoxidation, using amorphous silica as a carrier, titanium tetrachloride as a titanium source, vapor deposition to prepare an amorphous titanium dioxide catalyst, and Silanization treatment is used to improve the stability of the catalyst, but the reaction activity of titanium-based catalysts is low, and multiple catalysts need to be connected in series in industry, so the development of highly active heterogeneous catalysts is of great help to improve the efficiency of epoxidation reactions

Method used

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  • Epoxidation catalyst preparation method and prepared epoxidation catalyst thereof, and applications of epoxidation catalyst

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Experimental program
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Effect test

Embodiment 1

[0077] Step (1): 100g silica gel (Megao Chemical SG08-1, specific surface area 300m 2 / g, average pore diameter 11nm) into a quartz fixed-bed reactor, heat the bed to 120 ° C, N 2 The flow rate is 0.5L / min, purging and drying for 2h, adding 5g of titanium tetrachloride into a 100ml three-neck flask, heating to 140°C, using 0.5L / minN 2 As a carrier gas, titanium tetrachloride vapor was introduced, and the introduction of titanium tetrachloride vapor was stopped after 2 hours.

[0078] Step (2): Heat the bed temperature to 190°C, using 0.5L / min N 2 As a carrier gas, 5 g of hexamethyldisilamine gas was introduced for 2 hours.

[0079] Step (3): maintain bed temperature at 190°C, N 2 Purge for 2h.

[0080] Step (4): Raise the bed temperature to 340° C., feed steam at a rate of 0.3 g / (h·gcat), and feed steam for 2 hours.

[0081] Step (5): Add the product obtained in step (4), 3 g of molybdenum dioxide dichloride, to 400 g of p-dichlorobenzene, heat to 180°C, condense and refl...

Embodiment 2

[0085] Except that the consumption of step (1) titanium tetrachloride is 2g, molybdenum dioxide dichloride 2.1g in step (5), all the other conditions are the same as embodiment 1. Obtained 2# epoxidation catalyst, its titanium content is 0.5wt%, molybdenum content is 1wt%.

Embodiment 3

[0087] Except that the consumption of step (1) titanium tetrachloride is 6g, molybdenum dioxide dichloride 2.1g in step (5), all the other conditions are the same as embodiment 1. Obtained 3# epoxidation catalyst, its titanium content is 1.5wt%, molybdenum content is 1wt%.

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Abstract

The present invention relates to an epoxidation catalyst preparation method and a prepared epoxidation catalyst thereof, and applications of the epoxidation catalyst. According to the present invention, titanium is loaded onto a silica gel by using a chemical vapor deposition method, silanization treatment and hydrolysis are performed, and molybdenum is loaded onto the titanium surface by using a liquid phase ion exchange compounding method so as to achieve the directional loading of molybdenum; the epoxidation catalyst has excellent molybdenum stability; and with the application of the epoxidation catalyst in oxidation of olefins to produce the corresponding epoxy compound, the catalytic activity and the selectivity are high.

Description

technical field [0001] The invention relates to a preparation method of an epoxidation catalyst, the prepared epoxidation catalyst and its application in olefin epoxidation. Background technique [0002] The epoxidation reaction of olefins is an important chemical reaction. On the one hand, the epoxidation product itself has important application value, such as the modification of organic elastomers, the chiral catalytic synthesis of drugs, etc.; On the one hand, epoxidized products are raw materials for the production of polyurethanes, surfactants, etc. [0003] Because epoxidized products are prone to deep oxidation reactions such as ring-opening reactions, the selection of catalysts is very important. Commonly used catalysts for olefin epoxidation are mainly compounds containing molybdenum, tungsten, titanium or vanadium. [0004] Because molybdenum has a strong ability to change valence, molybdenum compounds have good applications in selective oxidation reactions, in w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/28C07D301/19C07D303/04
Inventor 李俊平付松李静陈海波张礼昌黎源华卫琦丁建生
Owner WANHUA CHEM GRP CO LTD
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