Reactor provided with spiral pipe and application thereof

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 ...

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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

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