A gas-solid short contact time reaction device and its application

Abstract

The invention belongs to a reaction device with short gas-solid contact time and its application. The reaction device includes a riser reactor, a settling reactor, a gas-solid separator and a feeding device; the riser reactor is installed in the settling At the bottom of the reactor, the discharge port of the riser reactor is higher than the bottom discharge port of the settling reactor; the gas-solid separator is used for the separation of product gas and catalyst particles; the return device collects the bottom discharge port of the settling reactor The transported catalyst particles and the catalyst particles obtained by the gas-solid separator are returned to the bottom of the riser; the bottom of the riser is provided with a feed gas inlet pipe. The present invention realizes short-term contact between the catalyst particles and the gas through the riser reactor, avoiding the deep oxidation of target products such as ethylene, and at the same time, the catalyst particles carry the reaction heat and perform heat exchange outside the reactor, so that the temperature of the hot spot in the reactor is reduced , which is conducive to improving the selectivity of the target product.

Description

technical field [0001] The invention belongs to the technical field of reaction engineering, and relates to a reaction device and its application, in particular to a reaction device with short gas-solid contact time and its application. Background technique [0002] Ethylene is the basic raw material for synthetic plastics, synthetic fibers, synthetic rubber, medicine, dyes, pesticides, new chemical materials and daily chemical products, and is the most widely used basic organic chemical raw material. At present, ethylene is mainly obtained in two ways, one is through direct cracking of petroleum raw materials such as crude oil and oilfield gas; the other is through further steam pyrolysis of naphtha, a relatively light hydrocarbon mixture obtained from petroleum refining. With the increasing shortage of petroleum resources and the increasing demand for ethylene, opening up a new route for ethylene production has become a research hotspot at home and abroad. [0003] In 198...

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Problems solved by technology

However, the depth of methane oxidation is only regulated by means of oxygen graded intake, and the control method is single, and the fluidization zone is directly connected to the riser, so the matching between fluidization states is difficult to control, and it is easy to cause large fluctuations in product composition and large bed pressure drop

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