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A kind of rosin imidazoline quaternary ammonium salt compound, corrosion inhibitor and preparation method

A technology of quaternary ammonium salt compound, rosin imidazoline, which is applied in the field of corrosion inhibitor and its preparation, and the field of rosin imidazoline quaternary ammonium compound, which can solve problems such as cumbersome recovery and utilization of condensate oil, reduced anti-corrosion effect, localized corrosion, etc., and achieves Good water phase anti-corrosion effect, enhanced adsorption capacity, and reasonable distribution ratio

Active Publication Date: 2020-08-07
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in condensate gas reservoirs, oil-soluble corrosion inhibitors are easy to migrate into condensate oil, resulting in a decrease in the number of corrosion inhibitor molecules adsorbed on the metal surface, which directly reduces the anti-corrosion effect and even causes localized corrosion.
[0006] At the same time, in the process of high pressure and high flow rate production, the three-phase system composed of condensate oil, gas field water and corrosion inhibitor is prone to emulsification, which causes troubles for the recovery and utilization of condensate oil

Method used

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  • A kind of rosin imidazoline quaternary ammonium salt compound, corrosion inhibitor and preparation method
  • A kind of rosin imidazoline quaternary ammonium salt compound, corrosion inhibitor and preparation method
  • A kind of rosin imidazoline quaternary ammonium salt compound, corrosion inhibitor and preparation method

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preparation example Construction

[0036] In a second aspect, the embodiments of the present invention provide a method for preparing the above-mentioned rosin imidazoline quaternary ammonium salt compound, and the specific steps are as follows:

[0037] Step 101: Add abietic acid, diethylenetriamine and water-carrying agent to the reaction vessel, carry out dehydration reaction at 160-180°C for 2-2.5 hours, then raise the temperature to 200-240°C, and carry out cyclization reaction for 3-4 hours , heat and steam the water in the cyclization reaction product, and obtain rosin imidazoline after cooling.

[0038] Wherein, the molar ratio of abietic acid to diethylenetriamine is 1: (1.1-1.2); the water-carrying agent is 20-30% of the total mass of abietic acid and diethylenetriamine.

[0039] Step 102. Raise the temperature of rosin imidazoline to 70-90°C, drop diisooctyl phosphate, mix well, then raise the temperature to 120-130°C, react for 2-2.5 hours, and finally cool the reaction product to obtain rosin imida...

Embodiment 1

[0070] The present embodiment provides a kind of rosin imidazoline quaternary ammonium salt compound, and its chemical structural formula is:

[0071]

[0072] If this rosin imidazoline quaternary ammonium compound is prepared by the following method:

[0073] Step (1), prepare rosin imidazoline

[0074] Into a four-neck flask equipped with a stirrer, thermometer, water separator, condenser and nitrogen protection, add 0.5 mol of abietic acid, 0.6 mol of diethylenetriamine and 50 g of xylene in sequence, and react at 180°C for 2 hours. Then, the temperature was gradually raised to 220°C, and the reaction was carried out at this temperature for 4h. Finally, cool to room temperature to get rosin imidazoline.

[0075] Step (2), prepare rosin imidazoline quaternary ammonium compound

[0076] The above-mentioned rosin imidazoline was gradually heated up to 80° C., and then 0.65 moles of diisooctyl phosphate was gradually added into the four-necked flask to mix the components ...

Embodiment 2

[0078] This embodiment provides a kind of metal corrosion inhibitor, and this metal corrosion inhibitor comprises the following components by weight percentage:

[0079] 23 parts of rosin imidazoline quaternary ammonium salt compound prepared in Example 1, 2 parts of surfactant, 5 parts of auxiliary agent, 0.1 part of demulsifier, and the balance is mineral spirits.

[0080] The metal corrosion inhibitor is prepared by the following method:

[0081] In step , 1 g of demulsifier and 99 g of mineral spirits were stirred evenly at room temperature to obtain a concentrated solution of demulsifier, and the concentrated solution was 1% by weight.

[0082] Step , take 10g of the above demulsifier concentrate and dilute it with 60g of mineral spirits to obtain the diluted demulsifier solution.

[0083] Step , add 23g of rosin imidazoline quaternary ammonium compound to the diluted demulsifier solution, stir evenly at 40°C with a stirring speed of 150rpm, then cool to room temperature t...

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Abstract

The invention discloses a rosin imidazoline quaternary ammonium salt compound, a corrosion inhibitor and a preparation method and belongs to the field of corrosion prevention of oil and gas field. Thestructural formula of the rosin imidazoline quaternary ammonium salt compound is shown in the description. The rosin imidazoline quaternary ammonium salt compound provided by the embodiment of the invention is characterized in that a p heteroatom with higher adsorption capacity is introduced into a molecular structure, so that the adsorption capacity of the compound on the metal surface is further enhanced; by introducing two 8-carbon-number alkyl chains, integral hydrophilic and hydrophobic properties of the compound are balanced, the condition that the corrosion preventing effect is reduceddue to the fact that the compound is washed out by a flowing medium (gas-field water) from the metal surface is not easy to be caused, or the phenomenon that the number of corrosion inhibitor molecules migrating to an aqueous phase and the metal surface is excessively reduced caused by existence of condensate oil is avoided. Besides, when the rosin imidazoline quaternary ammonium salt compound isapplied to a sour gas condensate reservoir, the gas-field water and the condensate oil are not easy to emulsify by using an irregular branched structure of the rosin imidazoline quaternary ammonium salt compound.

Description

technical field [0001] The invention relates to the field of oil and gas field anticorrosion, in particular to a rosin imidazoline quaternary ammonium salt compound, a corrosion inhibitor and a preparation method. Background technique [0002] During the exploitation of sour gas reservoirs, the metal equipment and pipelines used for oil and gas extraction and transportation are easily corroded and invalidated, and the failure of metal equipment and pipelines will cause safety hazards in the exploitation of sour gas reservoirs. At present, metal corrosion inhibitors are mostly used to carry out anticorrosion work on the above-mentioned metal equipment and pipelines. Therefore, it is very necessary to provide a metal corrosion inhibitor suitable for sour gas reservoirs. [0003] Chinese patent CN101050537A discloses a corrosion inhibitor suitable for highly acidic gas reservoirs. The corrosion inhibitor consists of sulfur-containing imidazoline derivatives, additives, surfacta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D233/16C07F9/38C09K8/54C23F11/167
CPCC07D233/16C07F9/38C09K8/54C23F11/167
Inventor 江晶晶张东岳谷坛张强唐永帆陈文袁曦黄刚华肖杰彭芳
Owner PETROCHINA CO LTD
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