Fractionation method of hydrocarbon mixtures

A technology of mixed hydrocarbons and fractionation towers, applied in the direction of gasoline stabilization, etc., can solve the problem that the separation method and precision cannot meet the production of chemical raw materials, and achieve the effect of improving efficiency and separation precision

Active Publication Date: 2009-03-11
CHINA PETROLEUM & CHEM CORP +1
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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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  • Fractionation method of hydrocarbon mixtures
  • Fractionation method of hydrocarbon mixtures

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Embodiment

[0040] The present invention is used to fractionate the mixed hydrocarbons produced in the catalytic conversion process of the largest production of small molecular olefins and aromatics, and provide further separation and acquisition of raw materials for small molecular olefins, raw materials for extracting light and heavy aromatics, and recycle raw materials for returning to the cracking unit.

[0041] Feed is the reaction oil gas (pipeline 101 stream) that catalytic cracking unit comes, obtains heavy aromatics extraction raw material (pipeline 107 streams), back refining material (pipeline 110 streams), light aromatics extraction raw material (pipeline 107 streams) through the method provided by the present invention 116 Logistics), C 5 - Distillate (line 126 stream) and rich gas (line 123 stream).

[0042] The composition of each stream is shown in Table 1, and the number of plates and operating conditions of each tower are shown in Table 2.

[0043] It can be seen from ...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G7/02
Inventor 鲁维民许友好杨克勇张久顺常学良
Owner CHINA PETROLEUM & CHEM CORP
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