Method and equipment for quickly stabilizing activity of catalytic cracking catalyst

A catalytic cracking and catalyst technology, used in catalytic cracking, physical/chemical process catalysts, catalyst protection, etc., can solve the problems of deactivation, high catalyst activity, uneven catalyst activity reduction, etc., and achieve small size and fast combustion reaction speed. , The effect of improving the distribution of catalytic cracking products

CN102950031AActive Publication Date: 2013-03-06CHINA PETROLEUM & CHEM CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2013-03-06

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Abstract

The invention provides a method and equipment for quickly stabilizing the activity of a catalytic cracking catalyst. The method comprises the following steps that: (1) the catalyst enters the bottom of a dilute phase combustion tube via a fluidized bed reactor, is mixed with an oxygen-containing gas and fuels and then is combusted and flows upward, and the gas and the catalyst enter the fluidized bed reactor via a distributor at the outlet of the dilute phase combustion tube; (2) water vapor is injected into the fluidized bed reactor and is contacted with the high-temperature catalyst to carry out hydrothermal reaction to reduce the activity of the catalyst, the catalyst and the gas are separated at the top of the fluidized bed reactor, the separated gas is exhausted from the device and the separated catalyst returns to the fluidized bed reactor; and (3) operation is stopped and the catalyst is unloaded when the activity of the catalyst is reduced to the appropriate level. The invention also provides a catalyst ager implementing the aging method. By adopting the aging method and equipment provided by the invention, the operating conditions of the combustion reaction and the hydrothermal reaction can be controlled respectively, the activity of the aged catalyst is distributed uniformly and distribution of the products used for catalytic cracking reaction of hydrocarbon oil is obviously improved.
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Description

technical field

[0001] The invention relates to a method and equipment for stabilizing the activity of catalytic cracking catalysts, more specifically, a method and equipment for rapidly reducing the activity of catalytic cracking catalysts to a certain stable level. Background technique

[0002] Catalytic cracking technology is the main secondary processing technology of oil refining enterprises. The technology converts heavy hydrocarbon oil feedstocks into products such as gasoline, diesel, propylene and liquefied gas. During the operation of the catalytic cracking unit, the activity of the catalyst in the unit needs to be kept at a stable level. If the catalyst activity is too high, the yield of dry gas and coke will be too high, and the product selectivity will be poor; if the catalyst activity is too low, if it is lower than 55, it will cause the conversion rate to decrease and the yield of light oil products to decrease. The activity of the catalyst can be measured b...

Examples

Embodiment 1

[0055] Example 1 illustrates the catalyst aging effect of the method provided by the present invention.

[0056] The process flow of the catalyst aging device structure is attached figure 1 As shown, the catalyst aging device includes a fluidized bed reactor 5 and a dilute-phase combustion tube 4. The catalyst in the fluidized bed reactor passes through a pipeline 9 and a control valve 10, and enters the bottom of the dilute-phase combustion tube 4 to mix with air from the pipeline 1. Then it goes up the dilute phase combustion tube, and then mixes with diesel oil from line 2 for combustion reaction. After the combustion reaction is complete, the gas and catalyst are evenly introduced into the middle and lower part of the dense-phase bed of the fluidized bed reactor after passing through the distributor 21 at the outlet of the dilute-phase combustion tube. The steam from the pipeline 7 is injected into the bottom of the fluidized bed reactor, and the catalyst reacts hydrother...

Embodiment 2

[0059] Example 2 illustrates the effect of the aging catalyst provided by the method used in the catalytic cracking reaction.

[0060] The medium-sized device and feed oil in Comparative Example 2 were adopted, and the operating steps and reaction conditions were the same as those in Comparative Example 2, except that the catalyst was the catalyst with reduced activity obtained by aging in Example 1. The properties of the raw oil are shown in Table 4, and the reaction conditions and results are shown in Table 5.

[0061] Table 1

[0062]

[0063] 2 Properties of fuel oil and diesel

[0064] Density(20℃) / (kg / m 3 )

[0065] table 3

[0066] project

[0067] Table 4 Catalytic cracking reaction raw materials

[0068] Raw oil

[0069] Table 5 FCC reaction conditions and results

[0070]

[0071] It can be seen from Table 1 that compared with the conventional catalyst aging method, the method provided by the present invention has equ...