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Method for multi-tower parallel connected adsorption removal of polycyclic aromatic hydrocarbons in diesel oil

A technology for polycyclic aromatic hydrocarbons and diesel oil, applied in the petroleum industry, treating hydrocarbon oil, refining hydrocarbon oil, etc., can solve the problems of high operating cost, harsh conditions, and less research on adsorption and separation applications, and achieve low operating cost and low energy consumption , The effect of simple process

Active Publication Date: 2016-03-02
CNOOC TIANJIN CHEM RES & DESIGN INST +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The above methods, whether hydrofining or solvent refining, can reduce the content of polycyclic aromatic hydrocarbons in diesel, but the conditions are harsh and the operation cost is high
In the prior art, as a green separation technology, the aromatics adsorption separation technology is very mature, but it mainly focuses on the adsorption separation of C8-C10 light aromatics and the adsorption separation of trace polycyclic aromatics. For the adsorption and separation of heavy aromatics in diesel fraction Less applied research

Method used

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  • Method for multi-tower parallel connected adsorption removal of polycyclic aromatic hydrocarbons in diesel oil

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Embodiment 1

[0038] (1) The diesel pretreatment adsorbent adopts silicon oxide adsorbent, SiO 2The content is 99.9%, the average pore size of the adsorbent is 4-15nm, and the specific surface area is 280-450cm 2 / g, the pore volume is 0.5~0.9ml / g; the polycyclic aromatic hydrocarbon adsorbent adopts the composite adsorbent of alumina and silica, SiO 2 The content is 66%, Al 2 o 3 The content is 33%, and the rest are impurities.

[0039] (2) Pretreatment process conditions: diesel oil is passed into the pretreatment adsorption tower at 50ml / min, the temperature of the adsorbent bed in the pretreatment tower is controlled at 40-60°C, the pressure is 0.6-0.7MPa, and the adsorption space velocity is 0.8-1.0h -1 .

[0040] (3) The multi-tower parallel adsorption device includes 3 adsorption towers, each tower is filled with 2700ml of adsorbent, and the adsorption tower is first wetted with desorbent.

[0041] (4) The pretreated diesel oil enters the adsorption tower 2 through the valve 2A,...

Embodiment 2

[0044] (1) The diesel pretreatment adsorbent adopts silicon oxide adsorbent, SiO 2 The content is 99.9%, the average pore size of the adsorbent is 4-15nm, and the specific surface area is 280-450cm 2 / g, the pore volume is 0.5~0.9ml / g; the polycyclic aromatic hydrocarbon adsorbent adopts the composite adsorbent of alumina and silica, SiO 2 Content is 50%, Al 2 o 3 The content is 49%, and the rest are impurities.

[0045] (2) Pretreatment process conditions: diesel oil is passed into the pretreatment adsorption tower at 50ml / min, the temperature of the adsorbent bed in the pretreatment tower is controlled at 40-60°C, the pressure is 0.6-0.8MPa, and the adsorption space velocity is 1.0-1.2h -1 .

[0046] (3) The multi-tower parallel adsorption device includes 3 adsorption towers, each tower is filled with 2700ml of adsorbent, and the adsorption tower is first wetted with desorbent.

[0047] (4) The pretreated diesel oil enters the 2# adsorption tower through valve 2A, and t...

Embodiment 3

[0050] (1) The diesel pretreatment adsorbent adopts silicon oxide adsorbent, SiO 2 The content is 99.9%, the average pore size of the adsorbent is 4-15nm, and the specific surface area is 280-450cm 2 / g, the pore volume is 0.5~0.9ml / g; the polycyclic aromatic hydrocarbon adsorbent adopts the composite adsorbent of alumina and silica, SiO 2 Content is 40%, Al 2 o 3 The content is 59%, and the rest are impurities.

[0051] (2) Pretreatment process conditions: diesel oil is passed into the pretreatment adsorption tower at 50ml / min, the temperature of the adsorbent bed in the pretreatment tower is controlled at 40-60°C, the pressure is 0.6-0.8MPa, and the adsorption space velocity is 1.0-1.2h -1 .

[0052] (3) The multi-tower parallel adsorption device includes 3 adsorption towers, each tower is filled with 2700ml of adsorbent, and the adsorption tower is first wetted with desorbent.

[0053] (4) The pretreated diesel oil enters the 2# adsorption tower through valve 2A, and t...

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Abstract

The invention relates to a method for multi-tower parallel connected adsorption removal of polycyclic aromatic hydrocarbons in diesel oil. According to the method, active carbon, an oxide or a metal modified material is used as an adsorbent; diesel oil is firstly pretreated for adsorption removal of trace impurities; the diesel oil with impurities removed is introduced into multi-tower parallel connected adsorption equipment for adsorption separation of polycyclic aromatic hydrocarbons in the diesel oil, and simultaneously a desorbent is introduced; and through periodical switching of feed and discharge valves, the adsorption towers alternately carry out adsorption-regeneration to realize semi-continuous operation of adsorption-regeneration, so as to obtain desorbent-containing refined diesel component and polycyclic aromatic hydrocarbon components. As boiling points of the desorbent and the diesel component are quite different, a rectifying tower can be utilized to realize separation and recycling of the desorbent, and the refined diesel and polycyclic aromatic hydrocarbons are obtained. The technology for multi-tower parallel connected adsorption removal of polycyclic aromatic hydrocarbons in diesel oil has characteristics of low operation temperature, low pressure and continuous operation. In addition, the adsorption technology has strong capability of removing polycyclic aromatic hydrocarbons in diesel oil, and removal rate of polycyclic aromatic hydrocarbons can reach 80%.

Description

technical field [0001] The invention relates to a multi-tower parallel adsorption method for removing polycyclic aromatic hydrocarbons in diesel oil. technical background [0002] Polycyclic aromatic hydrocarbons refer to aromatic compounds containing two or more benzene rings, including naphthalene, anthracene, phenanthrene, pyrene and other compounds, which are widely present in diesel oil. Studies have shown that polycyclic aromatic hydrocarbons in diesel have a low cetane number and poor combustion performance, which is one of the main reasons for the formation of PM2.5 particulate matter in diesel vehicle exhaust, and the particulate matter containing polycyclic aromatic hydrocarbons is toxic, mutagenic and carcinogenic sex. [0003] For my country's oil refining industry, the quality of crude oil is poor, mainly heavy oil and low-quality oil, and the secondary processing is mainly catalytic cracking and coking. The high content of polycyclic aromatic hydrocarbons in d...

Claims

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Application Information

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IPC IPC(8): C10G25/08
CPCC10G25/003C10G25/08C10G2300/201C10G2400/04
Inventor 范景新李滨宫毓鹏赵训志臧甲忠王春雷周立坤于海斌王梦迪赵闯马月谦
Owner CNOOC TIANJIN CHEM RES & DESIGN INST
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