Method for preparing hydrogen and nitrogen by catalytic cracking regenerative fume

Abstract

The invention relates to a method of producing hydrogen and nitrogen by catalytic cracking regenerator gas. The invention has main content that: the high temperature oxygen-contained gas of a second regenerator enters to the bottom of a first regenerator, and is contacted, heated and burnt with a mixing catalyst composed of a carbon deposition catalyst in a self stripper and a regenerant in the second regenerator. The regenerating gas on the upper part of the first regenerator is separated from a half-regenerant by a cyclone separator. The generating gas enters into a pressure energy recovery system, and then enters into the subsequent hydrogen and nitrogen producing process. The half-regenerant enters into the second regenerator through a dipleg, and then is contacted and burnt with full burnt prevailing wind. The stripped carbon deposition catalyst backs into the first regenerator, and then a circulating is formed, in order to effectively use CO and CO₂ in the regenerating gas and CO₂ produced in the subsequent CO intermediate temperature changing process, and to improve the ratio of the carbon deposition on the first regenerator catalyst transferring into CO, and furthermore to improve the unit carbon deposition hydrogen yield rate of the catalyst.

Description

technical field [0001] The present invention relates to a new catalytic cracking reaction-regeneration technology and the process of using the regenerated flue gas to produce hydrogen and nitrogen. More specifically, it is a technology suitable for existing devices to improve regeneration capacity and light oil yield , is a technology to reduce greenhouse gas emissions and obtain large quantities of cheap hydrogen. Background technique [0002] As we all know, in order to improve the quality of gasoline and diesel, hydrofining has become an indispensable secondary processing method. How to obtain a sufficient amount of cheap hydrogen source is a problem that plagues the oil refining industry. [0003] CN1400159A proposes a method for producing hydrogen by using catalytic cracking regenerated flue gas. Although it is different from the currently commonly used methane steam cracking hydrogen production, heavy oil hydrogen production, coal hydrogen production and other methods ...

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Problems solved by technology

[0003] CN1400159A proposes a method for producing hydrogen by using catalytic cracking regenerated flue gas. Although it is different from the currently commonly used methane steam cracking hydrogen production, heavy oil hydrogen production, coal hydrogen production and other methods with high hydrogen costs, but because of its first The carbon-deposited catalyst in the first regenerator reacts with oxygen-containing gas at 500-660°C, the temperature is relatively low, and the first regenerator and the second regenerator are respectively fed with air, and the high-temperature flue gas produced by the second regenerator If it is discharged in another way, not only the pressure of the flue gas cannot be fully recovered, but also the CO in the flue gas produced by the second regenerator 2 And the CO produced by the subsequent medium-temperature conversion of CO 2 It cannot be effectively utilized, that is to say, the ratio of carbon deposits on the catalyst in the first regenerator to CO is not high, so that the hydrogen production rate per unit carbon deposit of the catalyst is limited

[0004] Now, many refineries have the following problems: not only the coking capacity of the regenerator of the catalytic cracking unit is not enough, and urgently needs to be improved, but also the hydrogen production unit needs to be built. How to spend a small amount of money to meet these two problems at the same time?

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