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A method and device for continuous large-scale preparation of olefin epoxidation catalysts

A large-scale preparation and catalyst technology, applied in physical/chemical process catalysts, chemical instruments and methods, organic chemistry, etc., can solve the problems of many process parameters, complex operation, difficult to control, etc., to improve preparation efficiency, simple operation, Well-designed effects

Active Publication Date: 2022-04-22
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the vapor deposition method has the following disadvantages: using a fixed-bed reactor for batch operation, the preparation process is cumbersome, the operation is complicated, frequent switching between each step is required, the process parameters are many and difficult to control; 2 Low density and low thermal conductivity lead to long catalyst preparation time and limit its large-scale production
[0005] In summary, the current conventional preparation methods of epoxidation catalysts have the problems of complicated preparation process operation, low preparation efficiency, and difficulty in realizing industrialized continuous large-scale production.

Method used

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  • A method and device for continuous large-scale preparation of olefin epoxidation catalysts
  • A method and device for continuous large-scale preparation of olefin epoxidation catalysts
  • A method and device for continuous large-scale preparation of olefin epoxidation catalysts

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Effect test

Embodiment 1

[0068] Attached figure 1 The catalyst is prepared in the continuous rotary furnace reactor shown. The inclination angle of the 1#-4# rotary furnace is set to 8°, and the installation height is 1#>2#>3#>4#, so that the screw feeder The inclination angle is 20°, and then the screw feeder connected to the converter is turned on, according to SiO 2 Feed speed, set the speed of the feeder; after the speed of the feeder is stable, feed nitrogen at room temperature from the converter inlet, measure the nitrogen flow rate at the tail gas outlet, and determine the airtightness of the converter and the gas inlet and outlet pipelines.

[0069] After the preparatory work is completed, turn on the converter heating, and raise the temperature of 1#~4# rotary furnaces to 150°C, 500°C, 250°C and 150°C respectively; set the rotating speed of the converter to 5r / min; / or N 2 For preheating, reactant steam and / or N 2 Preheat to 150°C, 500°C, 250°C and 150°C respectively, the gas fed into fur...

Embodiment 2

[0072] Attached figure 1 The catalyst is prepared in the continuous rotary kiln reactor shown. The inclination angle of the 1#-4# rotary kiln is set to 5°, and the installation height is 1#>2#>3#>4#, so that the screw feeder The inclination angle is 30°, then turn on the screw feeder connected to the converter, according to SiO 2 Feed speed, set the speed of the feeder; after the speed of the feeder is stable, feed nitrogen at room temperature from the converter inlet, measure the nitrogen flow rate at the tail gas outlet, and determine the airtightness of the converter and the gas inlet and outlet pipelines.

[0073] After the preparatory work is completed, turn on the converter heating, and raise the temperature of 1#~4# rotary furnaces to 200°C, 650°C, 300°C and 250°C respectively; set the rotating speed of the converter to 9r / min; / or N 2 For preheating, reactant steam and / or N 2 Preheat to 200°C, 650°C, 300°C and 250°C respectively, the gas fed into furnace #1 contain...

Embodiment 3

[0076] Attached figure 1 The continuous rotary furnace reactor shown (1# rotary furnace reaction gas is TiF 4 ) to prepare the catalyst, the inclination angles of 1#-4# rotary kilns are all set to 10°, the installation height is 1#>2#>3#>4#, the inclination angle of the screw feeder is 40°, and then Open the screw feeder connected to the converter, according to SiO 2 Feed speed, set the speed of the feeder; after the speed of the feeder is stable, feed nitrogen at room temperature from the converter inlet, measure the nitrogen flow rate at the tail gas outlet, and determine the airtightness of the converter and the gas inlet and outlet pipelines.

[0077]After the preparatory work is completed, turn on the converter heating, and raise the temperature of 1#~4# rotary furnaces to 300°C, 800°C, 400°C and 300°C respectively; set the rotating speed of the converter to 3r / min; / or N 2 For preheating, reactant steam and / or N 2 Preheat to 300°C, 800°C, 400°C and 300°C respectivel...

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Abstract

The invention relates to a method for continuous large-scale production of olefin epoxidation catalysts. The method adopts four sequentially connected rotary furnace reactors for continuous reaction preparation. The preparation steps include: (1) raising the four rotary furnaces to the reaction temperature respectively , and continuously feed reactant vapor and / or carrier gas respectively; (2) continuously add carrier particles into the rotary furnace, and continuously and sequentially perform active center vapor deposition, high temperature treatment, water treatment and silanization treatment; (3) cool down and collect Export materials. The present invention also provides a continuous large-scale production device for realizing the above-mentioned preparation method. The method and device provided by the invention realize the large-scale continuous production of the epoxidation catalyst, and the obtained catalyst can be used in industrial production such as propylene epoxidation, and has high activity and yield.

Description

technical field [0001] The invention belongs to the field of catalyst preparation, and in particular relates to a method and a device for continuous large-scale preparation of olefin epoxidation catalysts. Background technique [0002] The ethylbenzene co-oxidation process (PO / SM) using ethylbenzene hydroperoxide (EBHP) as the oxidant and the CHP process using cumene hydroperoxide (CHP) as the oxidant are two important processes for the production of propylene oxide (PO). These two processes overcome the shortcomings of the chlorohydrin method, such as large corrosion and large amount of sewage, and have the advantages of low product cost and low environmental pollution. The catalysts used in these two processes are large-pore Ti-Si molecular sieves or Ti-SiO 2 Composite oxides, it is reported that the service life of the catalyst is less than one year, but the annual demand for a set of industrial plants with an annual output of 300,000 tons of PO is more than 200 tons, an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J21/08C07D303/04C07D301/19
CPCB01J21/08C07D303/04C07D301/19
Inventor 王同济叶飞孙康李作金沙宇黎源
Owner WANHUA CHEM GRP CO LTD