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Method for improving stability of catalytic cracking heavy oil pumping aromatic hydrocarbon

A technology for catalytic cracking heavy oil and stability, applied in the field of catalytic cracking heavy oil, can solve the problems of poor stability, influence stability, poor effect, etc., and achieve the effect of improving adsorption efficiency, large specific surface area, and not easy to aggregate and settle.

Active Publication Date: 2015-06-17
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The work of improving the stability of oil products is currently divided into two types: hydrorefining and non-hydrofining. The effect of hydrodesulfurization is better, but a large number of reports have confirmed that after the removal of sulfur compounds, the stability of oil becomes worse, because On the one hand, a small amount of sulfur-containing compounds themselves are stabilizers for oil products. In addition, the increase in the amount of polycyclic aromatic hydrocarbons with saturated rings after hydrogenation will affect the stability; non-hydrogenation refining has the advantages of simple equipment, less one-time investment, and refining Low cost, easy operation, etc., especially suitable for small and medium refineries
Most of the non-hydrofining operating conditions are relatively moderate, generally at room temperature and pressure, so the equipment used can be the existing equipment of the refinery or slightly modified, thus greatly saving equipment investment, currently commonly used Alkali refining method, acid refining method, acid-base refining method, adsorption refining method, etc. can improve the stability of catalytic cracking heavy oil to extract aromatics to a certain extent, but the effect is not good.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A method for improving the stability of aromatic hydrocarbons extracted from catalytic cracking refining oil. The method uses 10% methanol as a solvent to prepare a 2% NaOH alkaline solution, adds attapulgite with a purity of 99%, and disperses into a slurry under ultrasonic dispersion , the weight ratio of attapulgite is 20% of the whole slurry. Add the refined preparation to the catalytic cracking heavy oil to extract aromatics in a ratio of 1:5, add a water separator on the device, stir and reflux for 3 hours under the protection of nitrogen, and then carry out vacuum distillation under a pressure of 10mmHg to obtain refined oil products , the color of the refined oil is 1.5, and the color has not changed after being placed at room temperature for 3 months.

Embodiment 2

[0022] A method for improving the stability of aromatic hydrocarbons extracted from catalytic cracking refining oil, the method uses 1% ethanol as a solvent to prepare a 10% sodium carbonate alkaline solution, adds attapulgite with a purity of 95%, and disperses into For slurry, the weight ratio of attapulgite is 50% of the whole slurry. Add the refined preparation to the catalytic cracking heavy oil to extract aromatics in a ratio of 1:50, add a water separator on the device, stir and reflux for 1.5 hours under the protection of nitrogen, and then carry out vacuum distillation under 1mmHg pressure to obtain refined oil products. The chroma of the refined oil is 2.0, and the chroma does not change after being placed at room temperature for 3 months.

Embodiment 3

[0024] A method for improving the stability of aromatic hydrocarbons extracted from catalytic cracking refining oil. The method uses 5% methanol as a solvent to prepare a 5% NaOH alkaline solution, adds attapulgite with a purity of 99%, and disperses into a slurry under ultrasonic dispersion , the weight ratio of attapulgite is 2% of the whole slurry. Add the refined preparation to the catalytic cracking heavy oil to extract aromatics in a ratio of 1:10, add a water separator on the device, stir and reflux for 0.5 hours under the protection of nitrogen, and then carry out vacuum distillation under a pressure of 30mmHg to obtain refined oil products , the color of the refined oil is 1.5, and the color has not changed after being placed at room temperature for 3 months.

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Abstract

The invention relates to a method for improving stability of catalytic cracking heavy oil pumping aromatic hydrocarbon. The method comprises the steps of highly diffusing attapulgite into the alcohol-containing alkaline solution to obtain size; adding the size into the pumping aromatic oil as a refining agent; heating and reflowing, and then releasing pressure to obtain the refined oil. Compared with the prior art, the method is high in controllability of the preparation condition, simple and convenient in operation, and high in stability of the refined oil.

Description

technical field [0001] The invention relates to catalytic cracking heavy oil, in particular to a method for improving the stability of aromatic oil extracted from catalytic cracking heavy oil. Background technique [0002] Catalytic cracking (FCC) process is one of the important means of lightening heavy oil. FCC heavy oil refers to catalytic cracking re-refined oil, re-refined oil slurry or external oil slurry, and its main components are aromatic hydrocarbons and easily cracked saturated hydrocarbons. A large number of industrial practices and research work have shown that heavy oil aromatics are non-ideal components in catalytic cracking feedstocks. The method of solvent extraction is used for catalytic cracking heavy oil, and the extracted saturated hydrocarbons that are easily cracked are returned to the catalytic cracking unit, and the remaining heavy aromatic oil is then comprehensively utilized. [0003] However, as a secondary processing product, FCC heavy oil cont...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G53/12
Inventor 张智宏李蒙舟刘幸幸
Owner CHANGZHOU UNIV