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Olefin preparation method using circulating fluidized bed process

A circulating fluidized bed, olefin technology, applied in chemical instruments and methods, catalyst activation/preparation, catalysts, etc., can solve problems such as low selectivity, and achieve the effects of improving selectivity, reducing fuel consumption, and reducing investment costs

Active Publication Date: 2020-01-17
GAS CO +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, even in the process of limiting the contact time between the hydrocarbon and the catalyst, in the early stage of the reaction, the hydrocarbon reacts with the catalyst to rapidly generate by-products other than olefins, so the conversion rate of the reaction raw material is high, but the selectivity is very low.

Method used

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  • Olefin preparation method using circulating fluidized bed process
  • Olefin preparation method using circulating fluidized bed process
  • Olefin preparation method using circulating fluidized bed process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0108] Example 1: High-speed fluidization zone

[0109] A. The production of cold model (Cold Model)

[0110] Same as Comparative Example 1, such as Figure 4 Made as shown.

[0111] B. Catalyst

[0112] The same catalyst as in Comparative Example 1 was used.

[0113] C. Fluidized Flow Region Experiment

[0114] The same implementation as Comparative Example 1, the catalyst circulation rate is injected through the lower inlet of the riser at 7.7 kg / hr, which corresponds to 33.6 kg / m2.s inside the riser. Under the conditions, according to the height of the riser, the pressure drop was measured, and the volume fraction of the catalyst (Solid fraction) was obtained (refer to Image 6 ). exist Image 6 Among them, the catalyst volume fraction at the lower 1 / 4 place and 3 / 4 place of the riser is 0.092 and 0.049 respectively, and the difference between the two places is 0.043. According to the definition of the present invention, it can be known that the fluidization of the h...

Embodiment 2A

[0134] Example 2A. Catalyst Preparation

[0135] A catalyst was prepared in the same manner as in Comparative Example 2.

[0136] B. Catalyst steam treatment process

[0137] The catalyst was steam-treated in the same manner as in Comparative Example 2.

[0138] C. Olefin Preparation Process

[0139] In Example 2, the same circulating fluidized bed process as in Comparative Example 2 was used except for the riser. Wherein, the height of the riser used is 2.4m and the diameter is 0.94cm.

[0140] The supplied raw material used was the same as that of Comparative Example 2, the supplied raw material was 300 g / hr, 590°C, and the space velocity of the catalyst was 8400 ml / gcat.hr, 640°C. On the other hand, the injection amount of the catalyst is 33.6kg / m when the cross-sectional area of ​​the riser is considered 2 · s (same as the cold model of Example 1).

[0141] As far as Example 2 is concerned, the speed of the total gas vaporized at the riser inlet is the same as that o...

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Abstract

The present invention relates to a circulating fluidized bed process for preparing olefin from a hydrocarbon material by means of a high-speed fluidized bed. Disclosed is a preferable process type formore efficiently increasing an olefin yield. According to the present invention, by means of using a catalyst, which enables a dehydrogenation reaction, and a high-speed fluidization regime in a circulating fluidized bed process, more sufficient volumetric ratio and distribution of the catalyst enabling a dehydrogenation reaction are provided, the yield of the olefin is efficiently increased and,particularly, excellent selectivity with respect to propylene can be maintained.

Description

technical field [0001] The present invention relates to a process for the preparation of olefins using a circulating fluidized bed process. Background technique [0002] Olefins such as ethylene, propylene are widely used in the petrochemical industry. Generally, such olefins are obtained in the pyrolysis process of naphtha. However, due to the shale gas revolution, etc., the competitiveness of processes using lower hydrocarbons as raw materials has gradually increased, and an on-purpose production process of olefins through a catalytic dehydrogenation process is required. [0003] The catalytic contact dehydrogenation process required for olefin production uses various types of lower hydrocarbon compounds as raw materials, showing excellent olefin production yields. However, in the fixed-bed commercial dehydrogenation process, although the yield of olefins is high at the initial stage of the reaction when the hydrocarbons are in contact with the catalyst, the conversion r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C5/32C07C11/06C07C9/08B01J37/06B01J35/02
CPCC07C2523/26C07C5/48B01J23/8872B01J23/94B01J35/40C07C11/06C07C5/322C07C9/08B01J37/06C07C2523/02C07C2521/04B01J2208/00557B01J2208/00539Y02P20/584B01J21/066B01J23/26B01J23/92B01J38/30C07C5/3332C07C2521/06
Inventor 朴德守洪雄基安亨赞崔源春朴容起
Owner GAS CO
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