Hydrocarbon adsorption dearylating process

A dearomatization and adsorbent technology, which is applied in the direction of adsorption purification/separation, refined hydrocarbon oil, petroleum industry, etc., can solve the problems that there is no separation of aromatic impurities adsorption cycle method, and achieve the effect of energy consumption optimization

Inactive Publication Date: 2000-02-02
PETROLEO BRASILEIRO SA (PETROBRAS)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0017] Although there are many publications on the subject matter related to this paper, none of these techniques propose an adsorption cycle process for the separation of aromatic impurities from hydrocarbon streams with a distillation range of 45 to 300°C

Method used

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Embodiment Construction

[0047] The following terms used in the description and claims of the present method are defined as follows: Desorption fluid

[0048] Refers to the fluid used in the cooling, draining / rinsing and desorption steps in the process. Hydrocarbon stream or feed

[0049] Refers to the hydrocarbon stream mixed with aromatics, which is to be treated by dearomatization. cycle hydrocarbon

[0050] Refers to the hydrocarbon feed recovered in the blowdown / flush step. gasified hydrocarbon

[0051] Refers to the effluent from the adsorber mixed with dissolved desorption fluid. hydrocarbon products

[0052] Refers to the effluent hydrocarbons from the degassed stripper (17). Aromatic fraction

[0053] Refers to a hydrocarbon stream mainly containing aromatic compounds, which is sent to the fuel pool. Nitrogen

[0054] is the inert gas used in the adsorbent regeneration step. Another use of this inert gas is to replace the desorption fluid as a desorbent in a closed loop. Adsorbent ...

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Abstract

To provide an effective adsorption for separation of aromatics from hydrocarbon containing much aromatic contaminants and capable of desulfurization and energy conservation or the like by contacting serially connected beds of molecular sieves. This adsorption process includes following steps; a hydrocarbon having 45-300 deg.C boiling point and including 0.5-15 wt.% aromatic carbon (Z) is adsorbed on serially connected beds A, B, C, D, E, F and G of molecular sieves for the compound Z (e.g. silicagel, zeolite or alumina) and purged with a controlled cold desorbing liquid so as to recover paraffin/isoparaffin/ naphthene-based hydrocarbons and the adsorbed compound Z is desorbed with a heated desorbing liquid by the aid of thermal swing temperature.

Description

[0001] This invention relates to a process for adsorptive dearomatization of hydrocarbon streams. More specifically, the present invention relates to a process for adsorptive dearomatization of a hydrocarbon stream exhibiting a boiling point range between 45 and 300° C., in which fractions the concentration of aromatic compounds reaches between 0.1 and 15% (wt. )between. The process involves the adsorption of aromatics in the feed to a series of molecular sieve beds and their desorption from these beds by a temperature swing adsorption operation (TSA). Also, product quality is improved due to the substantially complete removal of up to 100 ppm of mercaptans present, such as sulfides from methyl mercaptan to butyl mercaptan. The desorption fluid is a gas or vapor. The process of the present invention optimizes the adsorption and desorption cycle by making full use of the adsorption capacity of the adsorbent. The optimization of the cycle process and the energy utilization brou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G25/03C07C7/12C07C7/13C10G25/05C10G25/09
CPCF16D65/097
Inventor P·T·德苏萨W·K·胡茨瓦拉J·A·V·威伊拉F·A·D·桑提亚哥R·R·C·比诺K·马施罗
Owner PETROLEO BRASILEIRO SA (PETROBRAS)
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