Reactor capable of reducing back mixing for preparing alkenes by dehydrogenation of alkanes and preparation method

An alkane dehydrogenation and reactor technology, which is applied in the field of alkane dehydrogenation reaction devices and circulating fluidized bed alkane dehydrogenation reaction devices, can solve the problems of complex reaction regeneration system, avoid thermal reaction, reduce secondary conversion, The effect of increasing selectivity

Active Publication Date: 2018-10-16
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN 201510003556.0 Aiming at the problem that the reaction regeneration system is too complicated in the scheme proposed by ZL 201110123675.1, a simplified c...

Method used

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  • Reactor capable of reducing back mixing for preparing alkenes by dehydrogenation of alkanes and preparation method
  • Reactor capable of reducing back mixing for preparing alkenes by dehydrogenation of alkanes and preparation method
  • Reactor capable of reducing back mixing for preparing alkenes by dehydrogenation of alkanes and preparation method

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preparation example Construction

[0065] The preparation method of alkane dehydrogenation to olefins by using the above-mentioned reaction device for alkane dehydrogenation to olefins includes the following steps, the raw material enters the reaction section from the feed distributor, the raw material and the catalyst flow upwards in parallel, and the two contact to carry out the catalytic reaction, Among them, at the section where the reaction section and the lower end of the reactor settling section are on the same horizontal plane, the average linear velocity of the gas is controlled at 0.3-10.0m / s, the reaction temperature is preferably controlled between 500-650°C, and the mass space time of the reaction is 0.1~15h.

[0066] On the other hand, in the reaction section, the average linear velocity of the gas at the outlet cross section of the catalyst riser is controlled at 0.01-3 m / s, preferably 0.2-0.7 m / s. In the reduced-diameter reaction section, the linear velocity of the gas in the reaction section wi...

Embodiment 1

[0098] This embodiment refers to the attached figure 1 , 2 As shown, the reaction device for the catalytic dehydrogenation of alkanes provided in this application is used in combination with the catalyst regeneration device provided in this application. These two sets of devices can be used separately, and respectively used in combination with other reaction devices or catalyst regeneration devices in the prior art.

[0099] attached figure 1 The reaction device for the catalytic dehydrogenation of alkane comprises a reaction section 10 and a reactor settling section 11, the reactor settling section 11 is located at the top of the reaction section 10, and the diameter of the cross section of the reaction section 10 gradually decreases from bottom to top, and the catalyst is regenerated The inclined pipe 5 extends into the reaction section 10 , and the outlet end of the catalyst regeneration inclined pipe 5 is located at the lower part of the reaction section 10 . In this em...

Embodiment 2

[0111] Propane dehydrogenation produces propylene, adopts the equipment of embodiment 1 of the present invention

[0112] Raw material: 99wt% propane, feed rate 0.6t / h

[0113] Catalyst: Environmentally friendly metal oxide catalyst ADHO-1 (ZL 201110123675.1)

[0114] Reaction conditions: set a layer of grids every 0.5m in the catalyst bed in the reaction section; the average temperature of the bed, 600°C; the pressure of the settler, 0.03MPa; the mass empty time, 3h; the average gas line of the outlet section of the riser in the reaction section Velocity, 0.5m / s; at the section where the bottom of the settling section of the reactor is connected to the reactor, the average linear velocity of the gas is 2m / s.

[0115] Regeneration conditions: a layer of grids can be set every 0.5m in the dense phase section of the regenerator; the temperature of the dense phase section of the regenerator is 700°C.

[0116] Structural form of the reaction-regeneration system: the present inve...

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Abstract

The invention relates to reaction apparatus for catalytic dehydrogenation of alkanes. The reaction apparatus comprises a reaction section and a reactor sedimentation section; the reactor sedimentationsection is positioned on the upper part of the reaction section; the diameter of the reaction section is gradually decreased from top to bottom; a catalyst regeneration tube aslant stretches into thereaction section, and the outlet end of the catalyst regeneration slant tube is positioned at the lower part of the reaction section; and a feeding distribution device is positioned below the outletend of the catalyst regeneration slant tube in the reaction section. The reactants and the catalyst in the reactor flow concurrently upwards, so that the uniformity of the temperature distribution inthe reactor can be effectively improved, local high temperature can be avoided, and then the thermal reaction is reduced. In addition, the diameter of the reactor is gradually decreased along the flowing direction of the fluid, and the secondary conversion of the alkenes caused by back mixing is reduced, so that the yield and the selectivity of alkenes are improved. A high-temperature regeneratoris directly sprayed into the bottom of the dense-phase bed of the reactor, so that rapid mixing of the high-temperature catalyst with the catalyst in the reactor is facilitated, and local high temperature in the bed layer is avoided. The dense-phase fluidized catalyst is beneficial to the ending of the transmission of free radicals, so that the thermal reaction is reduced, and the selectivity of preparing alkenes by the dehydrogenation of alkanes is improved.

Description

technical field [0001] The invention relates to a circulating fluidized bed reactor, in particular to a circulating fluidized bed alkane dehydrogenation reaction device, and more specifically to an alkane dehydrogenation reaction device capable of reducing back-mixing. Background technique [0002] Olefins and diolefins (ethylene, propylene, butene, isobutylene, isoprene and butadiene, etc.) in synthetic resins, plastics, high-octane gasoline blending components (methyl tert-butyl ether, methyl tert-amyl Ethers and alkylated oils) and other high value-added products are widely used. In addition to these olefins, steam cracking of hydrocarbons (such as steam cracking of ethane, steam cracking of naphtha), catalytic cracking of olefins (such as Superflex technology), catalytic cracking of heavy oil (such as TMP, DCC technology) and catalytic pyrolysis of heavy oil (such as CPP technology) and other processes, the catalytic dehydrogenation of alkanes is also an important techn...

Claims

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Application Information

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IPC IPC(8): B01J8/26C07C5/333C07C11/09C07C11/06
CPCB01J8/004B01J8/1809B01J8/1863B01J8/26B01J8/388B01J2208/00017B01J2208/00548C07C5/3332C07C11/09C07C11/06Y02P20/584
Inventor 李春义王国玮
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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