Preparation method and application of novel high-efficient acidification corrosion inhibitor
An acidification corrosion inhibitor, high-efficiency technology, applied in the direction of chemical instruments and methods, organic chemistry, drilling composition, etc., can solve the problem of inability to apply high-temperature deep well acidification operations, poor temperature resistance of corrosion inhibitors, complex synthesis process, etc. problems, to achieve good corrosion inhibition effect, stable properties, and simple production process
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[0023] A kind of preparation method of novel high-efficiency acidification corrosion inhibitor, it comprises the steps:
[0024] 1) Synthesis of benzyl quinoline bromide compound:
[0025] The synthesis method of benzyl quinoline bromide compound is: take 1.0~1.3mol quinoline and 1.0~1.5mol benzyl bromide, add 1.0~1.3mol quinoline to the 5% reaction solvent of the total mass of quinoline and benzyl bromide , Stir evenly, then dropwise add 1.0~1.5mol benzyl bromide, 10~15min to complete the dropwise addition, rapidly raise the temperature to 160~190°C, react for 3~8h, and drop to room temperature to obtain benzyl quinoline bromide compound. The reaction solvent is methanol, absolute ethanol, isopropanol, dimethylsulfoxide or pyridine.
[0026] 2) Dilute the benzyl quinoline bromide compound to 8~15% with a solvent, in terms of mass percentage:
[0027] The solvent is one or more mixtures of methanol, absolute ethanol, isopropanol, acetone or dimethylformamide. In step 2) in ...
Embodiment 1
[0029] Add 12.92g of quinoline into 1.5g of isopropanol, stir evenly, then add 17.11g of benzyl bromide dropwise, finish the dropwise addition in 10~15min, quickly raise the temperature to 180°C, react for 3h, and cool down to room temperature to obtain benzyl bromide quinoline compounds. Take out 8g of this compound and mix with 92g of methanol to obtain the corrosion inhibitor of the present invention.
[0030] The molecular formula of this benzyl quinoline bromide compound is:
[0031]
[0032] With reference to the People's Republic of China Petroleum and Natural Gas Industry Standard "SY / T 5405-1996" method, the corrosion inhibitor samples prepared in Example 1 were tested on P110 steel test pieces under different hydrochloric acid concentrations, the corrosion time was 4h, and the corrosion temperature was 90 °C, the concentration of corrosion inhibitor is 1% (mass), the results are shown in Table 1.
[0033] Table 1 Corrosion rates at different concentrations of hy...
Embodiment 2
[0036] Add 14.21g of quinoline into 1.83g of absolute ethanol, stir evenly, then add 22.24g of benzyl bromide dropwise, finish the dropwise addition in 10~15min, quickly raise the temperature to 160°C, react for 5h, and cool down to room temperature to obtain benzyl bromide quinoline compounds. Take out 10g of the compound and mix it with 90g of absolute ethanol to obtain the corrosion inhibitor of the present invention.
[0037] The corrosion inhibitor samples prepared in Example 2 were tested in 15% (mass) hydrochloric acid solution on P110 steel specimens with different concentrations of corrosion inhibitors. The corrosion temperature was 90°C and the corrosion time was 4 hours. The results are shown in Table 2.
[0038] Table 2 Corrosion rates at different concentrations of corrosion inhibitors
[0039] Corrosion inhibitor concentration / % (mass) 0 0.5 1.0 1.5 2.0 Corrosion rate / (g m -2 h -1 ) 356.4852 1.9335 1.6142 1.3602 1.1394
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