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Method for removing metal from hydrocarbon oil by using inorganic acid

A technology of inorganic acid and hydrocarbon oil, applied in the field of metal removal, can solve the problems of low removal efficiency, high cost, large amount of metal removal agent, etc., and achieve the effect of high removal efficiency and small dosage

Inactive Publication Date: 2003-07-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The above-mentioned decalcification technology has a certain effect on the removal of calcium in crude oil, but the removal efficiency is not high, especially for crude oil with high calcium content, such as large amount of demetallization agent, high cost, which is not conducive to industrialization or The removal efficiency is low, so it cannot meet the requirements of the refining process, especially the requirements of catalytic cracking and heavy oil hydrogenation process.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] In this embodiment, hydrochloric acid is used for decalcification.

[0019] Experimental crude oil:

[0020] A: 7:3 mixture of heavy oil (containing calcium 240ppm) and kerosene (containing calcium 179ppm) in Karamay District 9;

[0021] B: Beijiang crude oil in Xinjiang (containing calcium 110ppm);

[0022] C: 7:3 mixed oil of Beijiang crude oil and Nanjiang crude oil (40.7ppm calcium content).

[0023] Hydrochloric acid, water injection, and demulsifier are formulated into an aqueous solution according to the agent / calcium molar ratio and water injection rate shown in Table 1, and the amount of demulsifier added is 50ppm. The aqueous solution and crude oil are fully mixed in a stirrer and then poured into a conical glass for desalination. The tank was separated from oil and water by using DP-II electric desalting demulsifier, with an electric field gradient of 200v / cm and a temperature of 80°C. It was taken out after 1 hour, and the crude oil before and after demuls...

Embodiment 2

[0027] In this example, hydrochloric acid was used to remove iron.

[0028] The crude oil used in the experiment was a 7:3 mixture of heavy oil and kerosene in Karamay Ninth District, and the iron content in the crude oil was 17.6ppm.

[0029] crude oil

[0030] From the results in the table, it can be known that the molar ratio of hydrochloric acid reagent / iron as low as 2.5 can meet the requirement of removing iron content.

Embodiment 3

[0032] In this example, nitric acid was used for decalcification.

[0033] The experimental procedure is the same as in Example 1, and the demulsification temperature is 60°C. The results are shown in Table 3.

[0034] crude oil

[0035] It can be seen from the results in the table that nitric acid has a good effect on removing calcium from crude oil, and the decalcification rate is over 85%.

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Abstract

A process for removing metals existing in the mode of nophthenate, especially calcium, from hydrocarbon oil includes mixing hydrocarbon oil with the aqueous solution of hydrochloric acid or nitric acid, water and demulsifier, emulsifying to change the metals into water-soluble ionic compound, and water-oil separation. Its advantages are low dosage of additive and high efficiency.

Description

technical field [0001] The present invention relates to a method for removing metals from hydrocarbon oils with mineral acids. technical background [0002] In recent years, with the development of oil extraction technology, many heavy crude oils have been extracted. The content of metals in these crude oils, especially some alkaline earth metals such as Ca and Mg, has greatly increased, and people have paid more and more attention to their influence on crude oil processing. Studies have shown that the increase of Ca content in raw oil will significantly reduce the molecular sieve and matrix area of ​​the catalyst, which will directly affect the activity of the catalyst. In recent years, some refineries refining high-Ca crude oil have been poisoned and deactivated by catalytic cracking agents, which not only greatly reduces the yield of light oil, but also affects the quality of downstream residual oil, resulting in a significant reduction in the refinery's crude oil proces...

Claims

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Application Information

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IPC IPC(8): C10G17/02
Inventor 徐振洪谭丽于丽
Owner CHINA PETROLEUM & CHEM CORP
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