On-line switching device and method for methanol-to-low carbon olefin fluidized bed catalyst

A technology of fluidized bed catalysts and low-carbon olefins, which is applied in the preparation of liquid hydrocarbon mixtures and the petroleum industry. It can solve problems such as catalyst loss, reduce fluidized bed catalyst switching time, and affect the stable operation of MTO devices. The effect of the total switching time

Pending Publication Date: 2022-07-15
CHINA SHENHUA COAL TO LIQUID & CHEM CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a methanol-to-low-carbon olefins fluidized-bed catalyst on-line The switching device and its method have the advantages of reducing catalyst wear and loss, reducing the switching time of the fluidized bed catalyst, and not affecting the stable operation of the MTO device

Method used

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  • On-line switching device and method for methanol-to-low carbon olefin fluidized bed catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0091] The dosing port is 1m away from the unloading port, and the carrier gas unit pressurizes the dosing tank 41 to 0.38MPa. Step 1) The total amount of Zhongke MTO catalyst added to the regenerator 2 each time is 4t, and the dosing flow rate is 0.6 t / h, in step 2), the time for the mixed catalyst to circulate back and forth between the regenerator 2 and the reactor 1 is 7h, and the amount of the mixed catalyst unloaded each time in step 3) is 3wt% of the catalyst in the regenerator 2. Step 3) The time for each unloading of the mixed catalyst is 7h, the total amount of catalyst in the reactor 1 and the regenerator 2 is 100t, and the temperature of the catalyst flowing through the unloading pipeline 3 is 100°C; Zhongke MTO catalyst The loss rate was 9.4%.

Embodiment 2

[0093] The dosing port is 3m away from the unloading port, and the carrier gas unit pressurizes the dosing tank 41 to 0.2MPa. Step 1) The total amount of Zhongke MTO catalyst added to the regenerator 2 each time is 8t, and the dosing flow rate is 0.2 t / h, in step 2), the time for the mixed catalyst to circulate back and forth between the regenerator 2 and the reactor 1 is 24h, and the amount of the mixed catalyst unloaded in step 3) is 15wt% of the catalyst in the regenerator 2. Step 3) The time for each unloading of the mixed catalyst is 2h, the total amount of catalyst in the reactor 1 and the regenerator 2 is 80t, and the temperature of the catalyst flowing through the unloading pipeline 3 is 300°C; Zhongke MTO catalyst The loss rate is 15.2%.

Embodiment 3

[0095] The dosing port is 2m away from the unloading port, and the carrier gas unit pressurizes the dosing tank 41 to 0.5MPa. Step 1) The total amount of Zhongke MTO catalyst added to the regenerator 2 is 2t each time, and the dosing flow is 2t / h, in step 2), the time for the mixed catalyst to circulate back and forth between the regenerator 2 and the reactor 1 is 48h, and the amount of the mixed catalyst unloaded each time in step 3) is 15wt% of the catalyst in the regenerator 2. Step 3 ) The time of each unloading of the mixed catalyst is 2h, the total amount of catalyst in the reactor 1 and the regenerator 2 is 120t, and the temperature of the catalyst flowing through the unloading pipeline 3 is 450°C; The loss rate was 13.1%.

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Abstract

The invention relates to the technical field of catalyst replacement, and discloses a methanol-to-low-carbon olefin fluidized bed catalyst on-line switching device and a method thereof.The methanol-to-low-carbon olefin fluidized bed catalyst on-line switching device comprises a reactor communicated with a methanol feeding pipeline, and the reactor is communicated with a regenerator filled with a catalyst to be replaced; the regenerator is provided with a catalyst unloading pipeline for unloading a catalyst and a catalyst adding pipeline for adding a fresh replacement catalyst, and the catalyst adding pipeline is communicated with the carrier gas supply unit. According to the method, a small amount of catalyst is slowly replaced for a long period by adopting a multi-time intermittent replacement mode, the catalysts of the reactor and the regenerator are gradually and completely switched, large-scale abrasion and loss of the catalysts cannot be caused, the switching time of the fluidized bed catalyst can be effectively shortened, stable operation of an MTO device is not influenced, and the cost is reduced. According to the invention, the technical blank of on-line switching of the fluidized bed catalyst of the in-service device in the production technology of preparing low-carbon olefin from methanol is filled.

Description

technical field [0001] The invention relates to the technical field of catalyst replacement, in particular to an on-line switching device for a fluidized bed catalyst for producing low-carbon olefins from methanol and a method thereof. Background technique [0002] Methanol-to-Light Olefins (MTO) refers to a chemical technology that uses methanol as raw material to generate low-carbon olefins at high temperature and under the action of catalysts. At present, the catalyst bed in the reverse reactor of the MTO device is generally a fixed bed or a fluidized bed. It is difficult to switch the catalyst online in the actual production of the fixed bed catalyst. When the catalyst is replaced, the device needs to be shut down and then replaced. Due to the differences in the physical and chemical properties of different catalysts, especially the different hardness of the catalyst skeleton, the friction between the catalysts in the fluidized bed will also cause catalyst wear and a lar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G3/00
CPCC10G3/57C10G3/60C10G3/62C10G2300/70C10G2300/4006C10G2300/4012
Inventor 闫庆亮陈斌许锐陈海辉黄令漫胡斐王泽予王翔刘洪伟王志军尉雪峰
Owner CHINA SHENHUA COAL TO LIQUID & CHEM CO LTD
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