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Reactor provided with spiral pipe and application thereof

A technology of spiral tube and reactor, applied in the field of catalysis, to achieve the effects of easy large-scale production and application, control of hot spot temperature, and reduction of overheating phenomenon

Active Publication Date: 2021-12-31
CHINA PETROLEUM & CHEM CORP +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 reactor provided with a helical tube and its application in order to overcome the problems in the prior art that the hot spot temperature of the catalyst bed is too high and methane and the resulting reaction product are deeply oxidized. The outer wall is surrounded by a spiral tube, and the purge gas is injected into the spiral tube, and the distance between the gas outlet of the spiral tube and the cross-section of the downstream end of the catalyst section is controlled to be 0.5-0.8 times the length of the catalyst section, and at The catalyst section uses a catalyst whose carrier is at least one of CaO, MgO and BaO, and whose active component is an oxide of an alkali metal. The purge gas is used as a heat carrier to remove the heat of reaction, and the hot spot temperature of the catalyst bed is effectively controlled, so that when In the case of a large amount of catalyst loading, the reaction system is easier to control, reducing the phenomenon of runaway temperature, thereby inhibiting the deep oxidation of methane to a certain extent, improving the conversion rate of methane and the selectivity and yield of carbon dihydrocarbons, which has a good Industrial application prospect

Method used

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  • Reactor provided with spiral pipe and application thereof
  • Reactor provided with spiral pipe and application thereof
  • Reactor provided with spiral pipe and application thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0053] The preparation method of the catalyst without additives: add the precursor of the active component into 50°C, 25g deionized water, add the carrier, stir for 2 hours, dry at 120°C for 24 hours, and then roast at 750°C for 6 hours to obtain the catalyst.

preparation example 2

[0055] The preparation method of the catalyst with the auxiliary agent: add the precursor of the active component into 25g deionized water at 50°C, add the carrier, stir for 2 hours, and dry at 120°C for 24 hours to obtain solid A; then the precursor of the auxiliary agent Dissolve in 25 g of deionized water at 50°C, add solid A, stir for 2 hours, dry at 120°C for 24 hours, and then roast at 750°C for 6 hours to obtain the catalyst used in the examples.

[0056] The precursor of the active component and the precursor of the auxiliary agent in the preparation example all refer to nitrate, and the usage amount of each component makes the content of the active ingredient and the auxiliary agent in the catalyst as shown in table 1:

[0057] Table 1

[0058]

[0059]

[0060] Note: the content of each component in the catalyst is based on 100g carrier;

[0061] " / " indicates that there is no additive in the catalyst.

Embodiment 1

[0063] The reactor is a quartz tube with an inner diameter of 10mm and a length of 530mm. The total catalyst loading is 1g, and the length of the catalyst section reaches 10mm. A spiral tube with an outer diameter of 2mm is inserted from the top of the reactor, and the inner diameter of the spiral tube is 1mm. , the length of the helical tube is 20cm, the distance between the outer wall of the helical tube and the outer wall of the reaction chamber is 0mm, the pitch of the helical tube is 3mm, the distance between the gas outlet of the helical tube and the cross-section of the downstream end of the catalyst section is 8mm, and nitrogen flows from the helical tube The air inlet of the nitrogen gas enters and is discharged from the gas outlet of the spiral tube. The nitrogen temperature is 30°C and the nitrogen flow rate is 200mL / min. The reaction pressure is the pressure generated by the raw material itself, that is, 0.011MPa, the reaction temperature is 750°C, the volume ratio ...

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Abstract

The invention relates to the field of catalysis, and discloses a reactor provided with a spiral pipe and application thereof. The reactor internally comprises a reaction cavity, a catalyst section filling the reaction cavity and a spiral pipe arranged around the outer wall of the reaction cavity. An air outlet of the spiral pipe is located below the catalyst section, and the distance between the air outlet of the spiral pipe and the cross section of the downstream end of the catalyst section is 0.5-0.8 times of the length of the catalyst section. A catalyst in the catalyst section comprises a carrier and an active component loaded on the carrier, wherein the carrier is at least one of CaO, MgO and BaO, and the active component is an oxide of alkali metal. Purging gas is used as a heat carrier to remove reaction heat, so that the hot-spot temperature of a catalyst bed layer is effectively controlled, and the temperature runaway phenomenon is reduced. Therefore, deep oxidation of methane is inhibited to a certain extent, and the methane conversion rate and the selectivity and yield of C2 hydrocarbon are improved. The reactor has a very good industrial application prospect.

Description

technical field [0001] The invention relates to the field of catalysis, in particular to a reactor provided with a spiral tube and an application thereof. Background technique [0002] Natural gas is favored because of its cleanness, abundant reserves, wide distribution, and comprehensive economics superior to other fuels, and is considered to be an ideal fuel and raw material for the chemical industry in the future. Proved natural gas reserves far exceed crude oil reserves. The methane content in natural gas is generally about 95%. However, methane cannot be liquefied at room temperature, which brings inconvenience to storage and transportation. Therefore, the utilization of methane has become a hot spot of concern. [0003] Since the direct production of C2 hydrocarbons from methane was proposed in 1986, a large number of literatures have reported the progress of methane oxidative coupling reaction in the following ten years. The methane oxidative coupling reaction is a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J8/02B01J8/04C07C9/06C07C11/04C07C2/84B01J23/10B01J23/04
CPCB01J8/0285B01J8/0496C07C2/84B01J23/10B01J23/04B01J23/002B01J2208/00194C07C2523/10C07C2523/04B01J2523/00C07C9/06C07C11/04B01J2523/11B01J2523/22B01J2523/36B01J2523/12B01J2523/23B01J2523/3706B01J2523/13B01J2523/3712Y02P20/52
Inventor 赵清锐邵芸王雪韦力武洁花张明森刘东兵
Owner CHINA PETROLEUM & CHEM CORP
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