A system for extracting special solvent oil from stable light hydrocarbons

Abstract

The invention discloses a method and a system for extracting special solvent oil from stable light dydrocarbon and belongs to the technical field of oil refining and chemical engineering. The method comprises the following steps: feeding a raw material, namely stable light dydrocarbon into a de-heavy fractionator so as to obtain light component oil and heavy aromatics; feeding the light componentoil into a light component removal tower so as to obtain a byproduct, namely the stable light dydrocarbon and a C6-C7 component; feeding the C6-C7 component into a hexane removal tower so as to obtainhexane oil and heptane oil; feeding the hexane oil into a hexane oil separation tower so as to obtain isohexane and n-hexane; feeding the heptane oil into a heptane oil separation tower so as to obtain isoheptane and n-heptane. The system comprises the de-heavy fractionators, the light component removal tower, the hexane removal tower, the hexane oil separation tower and the heptanes oil separation tower. By adopting the technical scheme of the embodiment of the invention, efficient utilization of the stable light dydrocarbon is achieved, the largest benefits can be made with limited resources, economic benefits of companies are increased, and meanwhile market requirements can be met.

Description

technical field [0001] The invention belongs to the technical field of oil refining and chemical industry, in particular to a system for extracting special solvent oil from stable light hydrocarbons. Background technique [0002] Stable light hydrocarbons are one of petroleum products, which can be separated into various organic raw materials. In my country, the supply of stable light hydrocarbons is very tight. Traditionally, oil refining and chemical enterprises use light and heavy cutting methods to use light oil as ethylene. Raw materials or gasoline blending components, and heavy oil as reforming raw materials, this utilization method fails to fully realize the optimal utilization of its hydrocarbon group composition: [0003] 1. The stable light hydrocarbons in the raw material contain certain colloids. The traditional separation method is easy to coke, and it is easy to block the internal parts of the tower after coking. If the separation accuracy cannot be achieved, t...

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Problems solved by technology

[0003] 1. The stable light hydrocarbons in the raw material contain certain colloids. The traditional separation method is easy to coke, and it is easy to block the internal parts of the tower after coking. If the separation accuracy cannot be achieved, the output will be affected;

[0004] 2. Ethylene raw materials (light oil C3-C6) contain some cycloalkanes and aromatics, which affect the mass yield of trienes and are prone to coke;

[0005] 3. The reforming raw material (heavy oil C7-C11) contains some normal alkanes, which affects the operation of the reforming unit and the liquid mass yield;

[0006] 4. The current extraction equipment has a high height of de-weighting tower, large investment, large amount of steam consumption and high cost

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