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Synthesis and Performance Evaluation of Amphoteric Imidazoline as Corrosion Inhibitor

Author: JiangHuaPeng
Tutor: ShiShunCun
School: Hunan University of Science and Technology
Course: Applied Chemistry
Keywords: Amphoteric imidazoline Inhibitor Naphthenate Synthesis
CLC: TG174.42
Type: Master's thesis
Year: 2007
Downloads: 200
Quote: 2
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Abstract


Naphthenic acid is a by-product of the petrochemical production of 30,000 t / a in China. Resource utilization is low, has great potential for development. Naphthenate imidazoline amphoteric compound as a corrosion inhibitor research has significance. This thesis for the synthesis of an oil-soluble naphthenic acid and diethylene triamine cycloalkyl group imidazoline intermediates with sodium chloroacetate, and acrylic acid for further synthetic amphoteric imidazoline investigated for two different types of synthetic different The reaction conditions for the synthesis products, identified by a suitable synthesis conditions were as follows: the optimum conditions of the reaction of imidazoline and sodium chloroacetate is: the imidazolin with sodium chloroacetate molar ratio of 1:4; reaction temperature of 80 ° C -90 ° C ; pH 8-10; reaction time and solid content related to 4h-13h. The imidazoline and acrylic acid suitable reaction conditions are: imidazoline: acrylic acid (molar ratio) = 1:4; reaction temperature: 110 ° C -140 ° C; reaction 2h; added last and acrylic acid in an equimolar solution of NaOH. Preliminary comparison of two kinds of corrosion performance of the product, select acetoxy amphoteric imidazoline MC on behalf of, the use of corrosion inhibition performance of corrosion in different corrosive conditions are as follows: rotation of concentration k = 1.5 for circulating cooling water on coupon method: when used alone MC20mg / L, 99.5% of the corrosion rate of carbon steel, the corrosion rate of 0.0033mm / a, but there is a slight pitting; The higher the speed, the corrosion rate is also higher; MC Zn or HEDP complex, can eliminate pitting, the corrosion rate less than 0.076mm / a. In simulated oilfield water added to 50 mg / L of MC on static coupon weight loss method: carbon steel corrosion rate can reach 94.7%, the corrosion rate of 0.029mm / a, but under the scale pitting; MC with HEDP complex, the dosage is 100mg / L 20mg / L Paradise produce inhibition was 96.2%, the corrosion rate of carbon steel 0.021mm / a; simulated oilfield water pH was adjusted to 6, MC dosage for 60mg / L Paradise produce a corrosion rate of 99.3%, the corrosion rate of carbon steel 0.011mm / a. HCl-H 2 S etching solution on static coupon weight loss method: (1000mg / L) HCl-(100mg / L) H 2 S solution inhibitor MC 80mg / L saturated adsorption, corrosion rate of 96.0%, the corrosion rate of 3.3 mm / a; organic amine corrosion rate of carbon steel can adjust the pH to 7 to 0.032 mm / a, the inhibition rate was 99.96%. In the range 100mg/L-500mg/L, with the increase of the concentration of H 2 S, the increase in the corrosion rate; corrosion inhibitor MC and the pH adjusted to 7, when H S concentration ≤ 200 mg / L of carbon steel corrosion rate less than 0.125mm / a.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metal corrosion protection,metal surface treatment > Corrosion control and protection > Metal surface protection technology > Metal preservatives,corrosion inhibitors
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