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Imidazoline polyoxyethylene ether corrosion inhibitor for oil collection and transmission pipeline and preparation method of corrosion inhibitor

A technology of imidazoline polyoxyethylene ether and acid imidazoline polyoxyethylene ether is applied in the field of petroleum and petrochemical gathering pipelines and equipment protection, and can solve the problems of formaldehyde and benzaldehyde, such as irritating odor, being difficult to obtain, and inactivating, and achieving enhanced Corrosion inhibition effect, easy control, firm film formation effect

Active Publication Date: 2020-04-03
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In recent years, great progress has been made in research on corrosion inhibitors for the corrosion of oil and gas field gathering and transportation pipelines at home and abroad. For example, CN105154049B discloses a corrosion inhibitor for the development of formation water in Tahe Oilfield and its preparation method. The agent is Mannich base, and the raw materials used contain acetone, which is a controlled raw material and is not easy to obtain, and the smell of formaldehyde and benzaldehyde used is relatively irritating; CN103060811B discloses a corrosion inhibitor, which uses benzotriazole, mercapto Composite composition such as benzothiazole, imidazoline sodium silicate, etc., the addition of composite non-sodium silicate may form silicon scale in the system, forming new problems; CN103289671 discloses a corrosion inhibitor and its preparation method, wherein Grafting dichlorobutane or dibromobutane to the corrosion inhibitor, the organochlorine may cause deactivation of downstream refinery catalysts

Method used

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  • Imidazoline polyoxyethylene ether corrosion inhibitor for oil collection and transmission pipeline and preparation method of corrosion inhibitor
  • Imidazoline polyoxyethylene ether corrosion inhibitor for oil collection and transmission pipeline and preparation method of corrosion inhibitor
  • Imidazoline polyoxyethylene ether corrosion inhibitor for oil collection and transmission pipeline and preparation method of corrosion inhibitor

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preparation example Construction

[0064] The present invention also provides a preparation method of any one of the above-mentioned corrosion inhibitors, comprising the following process:

[0065] Mix oleic acid and abietic acid with polyamines to undergo amidation reaction, and keep the amidation product system at 170-220°C for more than 1 hour to obtain a reaction intermediate system with an acid value of less than 5 mg / kg;

[0066] Feed ethylene oxide into the reaction intermediate system to react to obtain the main agent;

[0067] At room temperature, mix the main agent and the compound and stir evenly to obtain the corrosion inhibitor;

[0068] or,

[0069] Using oleic acid and abietic acid to mix with polyamines to undergo amidation reaction, and keep the amidation product system at 170-220°C for more than 1 hour to obtain two reaction intermediate systems with an acid value of less than 5 mg / kg;

[0070] Feed ethylene oxide into the two reaction intermediate systems to react respectively, and mix the ...

Embodiment 1

[0090] The preparation method of the corrosion inhibitor of the present embodiment comprises the steps:

[0091] 1) Add the mixed acid and hydroxyethylethylenediamine into the reaction kettle at a molar ratio of 1:1.4, then add xylene water-carrying agent (10% of the total material), heat and stir to raise the temperature to 150-160°C and keep it warm for 3 hours, the heating rate is not higher than 20°C / 10m2n; wherein, the mixed acid includes oleic acid and abietic acid, and the molar ratio of oleic acid to abietic acid is 1:4;

[0092] During the reaction, water flows out from the reactor top condensing pipe, and what is generated at this time is the amide of oleic acid and the amide of abietic acid;

[0093] 2) Continue to heat up to 170-180°C, after 1.5 hours of reaction, continue to heat up to 210-220°C, keep warm at this temperature for 4 hours, the heating rate is not higher than 20°C / 10m2n, and then release a molecule of water to undergo a cyclization reaction; If the...

Embodiment 2

[0099] The preparation method of the corrosion inhibitor of the present embodiment comprises the steps:

[0100] 1) Add the mixed acid and hydroxyethylethylenediamine into the reaction kettle at a molar ratio of 1:1.3, then add xylene water-carrying agent (10% of the total material), heat and stir to 150-160°C and keep warm for 3 Hours, the heating rate is not higher than 20°C / 10m2n; wherein, the mixed acid includes oleic acid and abietic acid, and the molar ratio of oleic acid to abietic acid is 3:7;

[0101] During the reaction, water flows out from the reactor top condensing pipe, and what is generated at this time is the amide of oleic acid and the amide of abietic acid;

[0102] 2) Continue to heat up to 170-180°C, after 1.5 hours of reaction, continue to heat up to 210-220°C, keep warm at this temperature for 4 hours, the heating rate is not higher than 20°C / 10m2n, and then release a molecule of water to undergo a cyclization reaction; If the acid value of the detection...

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Abstract

The invention provides an imidazoline polyoxyethylene ether corrosion inhibitor for an oil collection and transmission pipeline and a preparation method of the corrosion inhibitor. The corrosion inhibitor comprises the following components in percentage by mass: 15-25% of a main agent and 75-85% of a compound; the main agent is prepared from first unsaturated acid imidazoline polyoxyethylene etherand second unsaturated acid imidazoline polyoxyethylene ether, wherein the first unsaturated acid imidazoline polyoxyethylene ether has a structure represented by a formula [1], and the second unsaturated acid imidazoline polyoxyethylene ether has a structure represented by a formula [2]; R1 in the formula [1] is a group represented by a formula [3]; and R2 is a group represented by a formula [4]. The corrosion inhibitor has high solubility in hypersalinity water so as to firmly form a film in the inner wall of the oil collection and transmission pipeline, and enables a good corrosion prevention effect on the oil collection and transmission pipeline.

Description

technical field [0001] The invention relates to a corrosion inhibitor preparation technology, in particular to an imidazoline polyoxyethylene ether corrosion inhibitor for oil gathering and transportation pipelines and a preparation method thereof, belonging to the technical field of petroleum and petrochemical gathering and transportation pipelines and equipment protection. Background technique [0002] due to H 2 S, CO 2 Dual effects on metallic materials and H 2 S, CO 2 Gas-to-gas interactions, plus downhole Cl - As well as the high temperature and high pressure environment of the gas production system, the corrosion of equipment and pipelines in this complex and harsh multiphase medium has become extremely serious and complicated. With the large-scale development of oil and gas fields, the H 2 S / CO 2 Corrosion is a growing problem. Gathering and transportation pipelines contain CO 2 、H 2 S, Cl - When serving in a multi-phase environment with various corrosive m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F11/02
CPCC23F11/02Y02P90/70
Inventor 宋文文张娟涛李彬熊新民陈庆国李有伟胡金虎
Owner PETROCHINA CO LTD
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