Method of Reducing the Acid Corrosivity of Oil

An etchant and catalyst technology, which is used in the field of converting acid in oil into non-corrosive substances, can solve problems such as increased energy consumption, catalyst poisoning, and low catalyst efficiency.

Inactive Publication Date: 2016-07-06
GENERAL ELECTRIC CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of heterogeneous metal-based catalysts presents two potential risks: inefficiency of the catalyst due to fouling, and catalyst poisoning of the oil downstream of it due to leakage of metal ions into the oil
In addition, high processing temperature will not only increase energy consumption, but also increase the possibility of naphthenic acid corrosion

Method used

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  • Method of Reducing the Acid Corrosivity of Oil
  • Method of Reducing the Acid Corrosivity of Oil
  • Method of Reducing the Acid Corrosivity of Oil

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0065] In this example, the acid-containing oil sample used is a dodecane solution of cyclohexanecarboxylic acid formed by dissolving cyclohexanecarboxylic acid in a dodecane solution, and its total acid value is 5 mgKOH / g oil. In order to carry out comparative analysis, three experiments with the molar ratios of cyclohexanecarboxylic acid and aziridine (CHC / AD) being 1 / 1, 1 / 2 and 1 / 3 were carried out respectively. figure 1 A graph of the total acid number as a function of treatment time for the three trials is shown. Such as figure 1 As shown, increasing the amount of aziridine can increase the decrease rate of total acid value.

example 2

[0067] In this example, the acid-containing oil sample used is a solution of naphthenic acid in dodecane formed by dissolving naphthenic acid in dodecane solution, and its total acid value is 5 mgKOH / g oil. For comparative analysis, three experiments with the molar ratio of naphthenic acid to aziridine (NA / AD) being 1 / 1, 1 / 2 and 1 / 3 were carried out respectively. figure 2 A graph of the total acid number as a function of treatment time for the three trials is shown. Such as figure 2 Shown, described test to the dodecane solution of naphthenic acid and the test to the dodecane solution of cyclohexanecarboxylic acid in example 1 obtain similar effect, increase aziridine consumption and all can increase the percentage of total acid value reduce speed.

[0068] by comparison figure 1 and figure 2 It can be found that under the above test conditions, the reaction rate of naphthenic acid is less than that of cyclohexanecarboxylic acid. Such as figure 1 As shown, it takes 10...

example 3

[0070] In this example, high-acid crude oil with a total acid value of 1.97 mgKOH / g oil purchased from Bohai Oilfield was used as the sour oil sample. The molar ratio of aziridine to acid in the oil is 3. image 3 The curves of total acid value and acid conversion rate as a function of treatment time are shown. The total acid value decreased rapidly in the first 2 days, and then the total acid value decreased slowly. It took approximately 4 days to achieve half of the acid conversion in the crude and approximately 10 days to reduce the total acid number below 0.5.

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Abstract

The invention provides a method for reducing acid corrosion to oil, which comprises the following steps: mixing acid-containing oil with a corrosion inhibitor; and treating the mixture at a temperature lower than 200 DEG C to reduce acid concentration of the oil. The corrosion inhibitor is selected from a) aziridine, b) a mixture of epoxides and a catalyst, and c) a composition of a and b, wherein the catalyst is selected from amine compounds, quaternary ammonium salts, quaternary phosphonium salts, and compositions of the above.

Description

technical field [0001] The present invention relates to a method of reducing the acid corrosivity of oil, in particular, to a method of converting acid in oil into non-corrosive substances. Background technique [0002] Based on the shortage of oil resources, more and more sour crude oils are produced to meet the growing demand for oil products in the world. However, naphthenic acids in high acid crude oils can cause high temperature corrosion problems. Therefore, how to prevent severe corrosion of crude oil on refining equipment during refining treatment of high-acid crude oil has become an issue of great concern. At present, the industrial methods to solve the corrosion problem of high-acid crude oil mainly include: improving the material properties of refining equipment through metallurgical methods to improve the corrosion resistance of refining equipment; adding corrosion inhibitors to high-acid crude oil; and combining high-acid crude oil with low-acid crude oil. Sou...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G75/02
CPCC23F11/141
Inventor 刘升霞谢里夫.埃尔丁彭文庆吕苏梁延刚N.K.帕特尔文卡特桑.摩尼席红霞陆梁华
Owner GENERAL ELECTRIC CO
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