Corrosion inhibitor and preparing method thereof

A corrosion inhibitor and solvent technology, which is applied in the field of petrochemical industry, can solve the problems of hidden dangers in the use of ethylene oxide, environmental pollution in production and construction, and high toxicity, and achieve safety performance guarantee, good anti-corrosion effect, and good water solubility. Effect

Inactive Publication Date: 2018-07-06
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The above-mentioned corrosion inhibitors have a good anti-corrosion effect on sewage pipelines, but because the corrosion inhibitors contain acetylenic alcohols, their toxicity is relatively high, which will pollute the production and construction environment; and, in order to improve the water solubility of the corrosion inhibitors At present, the imidazoline polyoxyethylene ether is usually grafted with ethylene oxide to make the resulting imidazoline polyoxyethylene ether have good water solubility, but in the actual production process, the use of ethylene oxide in the reaction system is likely to bring safety hazards

Method used

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  • Corrosion inhibitor and preparing method thereof
  • Corrosion inhibitor and preparing method thereof
  • Corrosion inhibitor and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] 1. Synthesis of the main agent

[0066] Add 574 kg of tung oil and 57.4 kg of water into a stainless steel reaction kettle, raise the temperature to 100°C, and keep it warm for 1 hour, add 684 kg of rosin and 800 kg of water, then raise the temperature to 140°C, and add 660 kg of it dropwise under nitrogen protection. Diethylenetriamine, the dropping time is controlled within 2 hours, and then the temperature is kept at 140-150°C for 3 hours; then the temperature is raised to 180°C for 2 hours, and then heated to 210°C for 5 hours; after the reaction, cool down to Below 50°C, add 334 kg of thiourea and 100 kg of ethanol, and after reflux reaction for 2 hours, add 310 kg of chloroacetic acid and 100 kg of ethanol, and reflux for 4 hours; after the end, add 600 kg of water to obtain a mass concentration of 60 % main agent, recorded as TOROIM-TH-AS.

[0067] figure 1 It is the infrared spectrogram of the main agent TOROIM-TH-AS synthesized in this embodiment, as can be s...

Embodiment 2

[0080] TOROIM-TH-AS (60% mass concentration) synthesized in Example 1, triethanolamine phosphate, thiourea, Tween-20, methanol, ethylene glycol and deionized water were mixed and stirred evenly, and the ratio of each component was shown in the table 4. The corrosion inhibitor is prepared, and its code name is TLM-W02.

[0081] Table 4 Composition ratio of corrosion inhibitor TLM-W02

[0082] components

[0083] The conditions completely consistent with those in Example 1 were used to test the protective effects of different corrosion inhibitor TLM-W02 additions on sewage pipelines. The specific test results are shown in Table 5, where the test period is 4 days.

[0084] Table 5 Corrosion rate and corrosion inhibition rate of different corrosion inhibitor TLM-W02 additions

[0085] Corrosion inhibitor dosage (mg / L)

[0086] According to the test results in Table 5, as the addition of corrosion inhibitor TLM-W02 increased from 0 to 100mg / L, the corrosion rat...

Embodiment 3

[0088] TOROIM-TH-AS (60% effective concentration) synthesized in Example 1, triethanolamine phosphate, thiourea, Tween-20, methanol, ethylene glycol, and deionized water were mixed and stirred evenly, and the ratio of each component was shown in Table 6, namely the prepared corrosion inhibitor, its code is marked as TLM-W03.

[0089] Table 6 Composition ratio of corrosion inhibitor TLM-W03

[0090] components

[0091] The protective effect of different corrosion inhibitor TLM-W03 additions on sewage pipelines was tested under the same conditions as in Example 1. The specific test results are shown in Table 7, where the test period is 4 days.

[0092] Table 7 Corrosion rate and corrosion inhibition rate of different corrosion inhibitor TLM-W03 additions

[0093] Corrosion inhibitor dosage (mg / L)

[0094] According to the test results in Table 7, as the addition of corrosion inhibitor TLM-W03 increased from 0 to 100mg / L, the corrosion rate of the sample decr...

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Abstract

The invention provides a corrosion inhibitor and a preparing method thereof. The corrosion inhibitor comprises components including, by weight part, 30 to 50 parts of a main agent, 10 to 20 parts of triethanolamine phosphate, 4 to 8 parts of thiourea, 2 to 5 parts of a surface active agent and 17 to 54 parts of a solvent. The main agent comprises a first chemical compound of the formula I structure shown in the specification and a second chemical compound of the formula II structure shown in the specification, and the mass concentration sum of the first chemical compound and the second chemical compound in the main agent is 60%. The corrosion inhibitor can effectively protect an oil and gas field combined station sewage pipeline in the hypersalinity sewage environment containing CO2 and H2S gas, and the beneficial effects of being good in water solubility and compatibility, high in safety, low in filling concentration, excellent in anti-corrosion effect, low in production process needand the like are achieved.

Description

technical field [0001] The invention relates to a corrosion inhibitor and a preparation method thereof, in particular to a corrosion inhibitor suitable for sewage pipelines and a preparation method thereof, belonging to the field of petrochemical industry. Background technique [0002] Corrosion inhibition treatment is an important method for anticorrosion of sewage pipelines in acid oil and gas field combined stations at home and abroad. The specific corrosion inhibition treatment process can be reasonably designed according to the characteristics of oilfield gathering and transportation and sewage system itself. In recent years, great progress has been made in the research of corrosion inhibitors for the anticorrosion of sewage pipelines in oil and gas field joint stations. Researchers at home and abroad have developed a series of corrosion inhibitors, mainly including organic amines, amides, and imidazolidine , quaternary ammonium salts, heterocyclic compounds and organic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F11/10C23F11/16
CPCC23F11/10C23F11/16
Inventor 李循迹宋文文杨向同王福善常泽亮鲜俊毛学强陈庆国钟诚王鹏王方智田鹏武兴翠文廷敏
Owner PETROCHINA CO LTD
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