A method and system for coker gasoline processing using double risers
A technology of coking gasoline and double riser, which is applied in the field of coking gasoline processing, can solve problems such as the influence of octane number in refinery gasoline pool, accelerate the deactivation of cracking catalyst, and low reactivity of alkane cracking, so as to improve economic and social benefits , reduce the toxic effect, improve the effect of reaction performance
Active Publication Date: 2021-11-16
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology
[0009] Among the above methods, the hydrofining method can reduce the impurities and olefin content of coked gasoline, improve the stability, and be used as a gasoline blending component, but because of its low octane number, it will still have a great impact on the octane number of the gasoline pool in the refinery
Coked gasoline can directly enter the catalytic cracking unit for cracking. The problem is that the high nitrogen content will accelerate the deactivation of the cracking catalyst and affect the distribution of products. At the same time, the cracking activity of alkane in gasoline is low, and a large amount of unreacted alkane enters gasoline products. Affect gasoline octane rating
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[0090] according to figure 1 The raw material oil is coking gasoline raw material, and the adsorption and separation reaction is carried out on a fixed-bed adsorption-desorption reactor. The n-paraffin adsorbent is 5A molecular sieve. Speed 1.0 hours -1 ; Desorption treatment conditions: the desorption gas is nitrogen, and the weight hourly space velocity of the desorption gas is 150 hours -1 , temperature 360°C. The nitrogen content in the absorbed oil is 350 μg / g, the normal paraffin content in the desorbed oil is 95% by weight, and the nitrogen content is 10 μg / g. The desorbed oil and absorbed oil produced by coking gasoline through adsorption and separation enter the heating furnace and are heated to 420°C.
[0091] The catalytic cracking reaction is carried out on the medium-sized device of the riser reactor. The preheated desorbed oil enters the bottom of the first riser reactor for the first catalytic cracking reaction, and the preheated absorption oil enters the b...
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Abstract
The invention relates to a method and a system for processing coking gasoline by adopting double risers. The method comprises: introducing a coking gasoline raw material into an adsorption and desorption reactor to contact with a normal paraffin adsorbent and carry out adsorption and separation reaction; The adsorbent of n-paraffin is desorbed by desorption gas; the desorbed oil is introduced into the first riser reactor to contact with the first catalytic cracking catalyst and the first catalytic cracking reaction is carried out; the residual oil is introduced into the second lift The tube reactor is contacted with the second catalytic cracking catalyst and conducts the second catalytic cracking reaction. The method and system of the present invention are used to process coker gasoline with high ethylene and propylene yields.
Description
technical field [0001] The invention relates to a method and system for coking gasoline processing using double risers. Background technique [0002] Ethylene and propylene are important basic raw materials for the petrochemical industry. At present, about 98% of the world's ethylene comes from tube furnace steam cracking technology. Among the raw materials for ethylene production, naphtha accounts for 46% and ethane accounts for 34%. About 62% of propylene comes from the co-production of steam cracking to ethylene. Steam cracking technology has been perfected day by day, and it is a process that consumes a lot of energy, and is limited by the use of high-temperature materials, so the potential for further improvement is very small. [0003] Coking is an important thermal processing process in petroleum refining. The coked gasoline produced during the coking process is a low-quality gasoline rich in olefins and high in impurities such as sulfur, nitrogen compounds and dien...
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IPC IPC(8): C10G55/06
CPCC10G55/06
Inventor 魏晓丽龚剑洪王迪
Owner CHINA PETROLEUM & CHEM CORP