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Polymethyl Schiff base, and preparation method and application thereof

A polymethyl schiff base and reaction technology, which is applied in the field of polymethyl schiff base and its preparation, can solve problems such as underground pipe material burst accident, threat to life and property, weightless corrosion and the like

Inactive Publication Date: 2020-10-20
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, oil well acidification will bring many problems to oilfield construction, such as surface pitting, hydrogen embrittlement and weight loss corrosion of pipelines and downhole metal equipment.
Corrosion of acid liquid may sometimes lead to sudden burst accidents of downhole pipes, posing a serious threat to life and property

Method used

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  • Polymethyl Schiff base, and preparation method and application thereof
  • Polymethyl Schiff base, and preparation method and application thereof
  • Polymethyl Schiff base, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] like figure 1 Shown, a kind of preparation method of polymethyl Schiff base comprises the following steps: 2.44g (0.02mol) salicylamide is joined in the round bottom flask that contains 25ml ethanol, then add 0.67g ethylenediamine drop by drop ( 0.01mol); the reaction mixture was acidified with 0.5mol of concentrated hydrochloric acid; then stirred for two hours to obtain yellow crystal salicylamide. Add 2ml of 40% sodium hydroxide solution to the mixture of salicylamide and formaldehyde with a molar ratio of 1:2, react at 70-80°C for 1 hour, add piperazine, and then react at 100-110°C The polymethyl Schiff base (SEPF) was obtained after 1 h.

[0023] The corrosion inhibition efficiency of the polymethyl Schiff base prepared in Example 1 to metal materials is analyzed through the following experimental examples. The metal materials are selected from low-carbon steel strips, and its components are: C, 0.14%; Mn, 0.35%; Si, 0.17%; S, 0.025%; P, 0.03%; the rest is Fe. B...

experiment example 1

[0033] In the absence and presence of different concentrations of SEPF, the low-carbon steel was soaked in 15% HCl (105±2°C) for 0.5h, and the corrosion test results are shown in Table 1:

[0034] Table 1 Corrosion test results

[0035]

[0036] It can be seen from Table 1 that the present invention also has excellent corrosion resistance in boiling hydrochloric acid, and with the increase of SEPF concentration, the corrosion rate decreases and the corrosion inhibition efficiency increases. The whole phenomenon occurs due to the increase of the adsorption and coverage area of ​​mild steel with the increase of SEPF concentration.

experiment example 2

[0038] The corrosion inhibition efficiency of the polymethyl Schiff base prepared in Example 1 was analyzed by Tafel polarization curve. The Tafel polarization curve was tested in a three-electrode cell at a temperature of 35°C ± 2°C. A mild steel sheet was used as the working electrode of the above composition, with an area of ​​1 cm2. A graphite rod was used as the counter electrode, and a saturated calomel electrode (SCE) was used as the reference electrode. Tafel polarization was performed using a Gamry potentiostat / galvanostat based on the Gamry frame system on the ESA400. Gamry's applications include EIS 300 for EIS measurements, DC 105 software for corrosion and Echem Analyst (version 5.50) software package for data fitting. At a scan rate of 1mVs -1 Under the circumstances, the polarization can be obtained by automatically changing the electrode potential, and the range of the electrode potential change is -250mVSCE to +250mVSCE. In order to test the corrosion inhib...

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Abstract

The invention discloses a polymethyl Schiff base, and a preparation method and application thereof. The preparation method comprises the following steps: reacting salicylamide with formaldehyde in a sodium hydroxide solution to obtain a product A; and reacting the product A with piperazine to obtain the polymethyl Schiff base. The salicylamide is prepared by reacting salicylaldehyde with ethylenediamine. The polymethyl Schiff base disclosed by the invention can effectively inhibit corrosion at high temperature, and has the advantages of low cost, high efficiency, convenience in use and the like when being used as an anti-corrosion measure; and when is the polymethyl Schiff base is suitable for corrosion inhibition of low-carbon steel at high temperature, an excellent using effect can be achieved.

Description

technical field [0001] The invention relates to the technical field of Schiff bases, in particular to a polymethyl Schiff base and its preparation method and application. Background technique [0002] Schiff base (Schiff base) refers to a class of organic compounds containing imine or azimido. So far, Schiff bases and their complexes have been widely used in the fields of medicine, catalysis, analytical chemistry, corrosion and photochromism. Among them, in the field of corrosion, the Schiff base can produce a chemical effect similar to a coordination bond with the metal atom on the surface of the metal material and be adsorbed on the surface of the metal material, thereby slowing down the corrosion of the metal material. Most of the existing Schiff bases are in Inhibits corrosion at low temperatures. [0003] In the later stage of oilfield exploitation, acidizing is one of the important measures for increasing production of oil wells and increasing injection of water well...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G73/06C09K8/74C07D295/135
CPCC07D295/135C08G73/0633C09K8/725C09K8/74C09K2208/32
Inventor 辛格
Owner SOUTHWEST PETROLEUM UNIV
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