Fractionation method of hydrocarbon mixtures

Abstract

The invention provides a method for fractionating mixing hydrocarbons. The mixing hydrocarbon raw material enters a fractionating tower, the fraction, of which the distillation range is more than 350 DEG C, is drawn out from the bottom of the fractionating tower; and first material current is drawn out from the middle-lower part of the fractionating tower, and is subjected to steam stripping in a first steam stripping tower to obtain the fraction of which the distillation range is between 250 and 360 DEG C; second material current is drawn out from the middle-upper part of the fractionating tower, and is subjected to steam stripping in a second steam stripping tower to obtain the fraction of which the distillation range is between 160 and 260 DEG C; and the oil gases exhausted from the top of the fractionating tower are subjected to condensation cooling separation to obtain rich gases and liquid, wherein the liquid is subjected to steam stripping in a third steam stripping tower to obtain C5<-> fraction and C6<+> fraction. The method aims at the special needs of the process on producing micromolecule hydrocarbons and aromatic hydrocarbons to the maximum extent to provide cracking materials for the process, and realizes the fine separation by the arrangement of three steam stripping towers of light aromatic hydrocarbon materials, heavy aromatic hydrocarbon materials and remixing materials, thereby improving the separation precision.

Description

technical field [0001] The invention relates to a method for fractionating mixed hydrocarbons, in particular to a method for fractionating mixed hydrocarbons produced in a catalytic conversion process. Background technique [0002] The fractionation system divides the gaseous products of the catalytic conversion process into fractions such as rich gas, naphtha, light diesel oil, re-refined oil and oil slurry according to the boiling point range. [0003] After being compressed, the rich gas is sent to the absorbing and stabilizing part together with crude gasoline, and then separated into dry gas, liquefied gas and stable gasoline, and light diesel oil is generally sent out as a blending component. Refined oil and oil slurry, depending on the operating plan, either exit the unit as heavy oil products, or return to the reaction part as reaction feed. [0004] Generally, the final boiling point of naphtha is 180-200°C, and that of light diesel oil is 330-360°C. [0005] Exis...

AI Technical Summary

Problems solved by technology

For the catalytic conversion process of prolific light olefins and aromatics, the target product is chemical raw materials, and fractional fractionation precision is required. The original fraction-level separation method and precision cannot meet the requirements for the production of chemical raw materials.

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