Catalytic hydrocarbon recombinant treating method

Abstract

A recombination of catalytic aromatic hydrocarbons is carried out by: fractionating them into gasoline fraction, diesel fuel fraction and intermediate distillate through catalysis main dephlegmator, extracting intermediate distillate and gasoline fraction to separate aromatic parts from no-aromatic parts, obtaining high-octane number gasoline oil from aromatic parts mixed with gasoline fraction to increase octane level of gasoline oil and diesel fuel fraction from no-aromatic parts mixed with previous diesel fuel fraction to increase crop and cetane number of diesel fuel. It needs less investment and materials are not limited, and can also increase variety of products.

Description

technical field [0001] The invention relates to a catalytic hydrocarbon recombination treatment method, in particular to a treatment method for catalytic hydrocarbon recombination to prepare high-quality gasoline, diesel oil and chemical light oil. Background technique [0002] Catalytic cracking, catalytic cracking and heavy oil catalytic cracking technologies are the core technologies of oil refining. Catalytic cracking is divided into wax oil catalytic cracking and heavy oil catalytic cracking; the oil and gas generated from the reverse regeneration system of these processes are collectively called catalytic hydrocarbons, and the obtained catalytic hydrocarbons are processed , Generally, it is fractionated by the main fractionating column, which can fractionate dry gas, liquefied gas, gasoline, diesel, heavy oil and other products. [0003] Along with more and more stringent environmental protection requirements, the standard of gasoline, diesel oil improves constantly, a...

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Problems solved by technology

[0003] Along with more and more stringent environmental protection requirements, the standard of gasoline, diesel oil improves constantly, and the processing method of existing catalytic hydrocarbon through fractionation column fractionation shows following deficiency: one is that the quality of gasoline and diesel oil produced by this processing method needs to be improved. Improvement: the olefin content of gasoline is on the high side, the octane number is on the low side, and the cetane number of diesel oil is on the low side; Second, the above-mentioned treatment method cannot produce gasoline of various grades at the same time, and the product variety is single; Third, the diesel oil produced, The proportion of gasoline does not match the demand of the market, diesel cannot meet the demand, and the supply of gasoline exceeds the demand

[0005] The above-mentioned measures have the following problems: ① construction investment is huge, operating costs are high, the scale is limited by raw materials, and there are irrational utilization of resources at the same time, such as reformed oil is the main raw material for polyester production, and a large amount of reformed oil is used for high The blending components of gasoline with octane number exacerbate the shortage of polyester raw materials that are already in short supply; ②The use of new catalysts can increase the octane number of gasoline, but it will lead to a substantial increase in the olefin content in gasoline. ③Adjust the operating conditions of catalytic cracking and increase the octane number of gasoline, which will also lead to an increase in the olefin content in gasoline and a decrease in the diesel-gasoline ratio; ④Adjust the gasoline distillation range and increase the octane number of gasoline. The margin is not large, which will also lead to an increase in the content of olefins in gasoline

[0007] The above measures have the following problems: ①The use of olefin-reducing catalysts will lead to a significant decrease in the octane number of gasoline; ②The hydrogenation and non-hydrogenation treatment technology of catalytic gasoline in stages, although the olefin content can be reduced, the octane number of gasoline will not increase , the investment in this technology is relatively large, and it is limited by hydrogen resources at the same time; ③ the use of double riser and other gasoline refining technologies can reduce olefins to a limited extent.

[0008] The cetane number of diesel oil is the core issue of diesel quality. At present, the main measures to increase the cetane number of catalytic diesel oil are high-pressure hydrogenation and high-pressure hydrogenation combination technology. Catalytic diesel oil processed by high-pressure hydrogenation and high-pressure hydrogenation combination technology The cetane number has been greatly improved, but the construction investment of this technology is huge, the operation cost is high, and it is limited by hydrogen resources.

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