A Study On Synthesis And Inhibition Performances Of Switchable Imidazoline Corrosion Inhibitors

Imidazoline is a kind of excellent corrosion inhibitor developed in the recent 30 years. It is widely used in the petroleum and natural gas production. Nowadays, with principle of sustainable development, corrosion inhibitors develop to be low toxic, high efficient and friendly to environment. The thesis deals with synthesis of a series of new switchable imidazoline whitch contains amidine that use begin gases (CO2 and air) as the triggers switch them "on" and "off". For one thing, it can improve imidazoline inhibitor's inihibition, for another, it can make this corrosion inihibitor recyclable.1. Imidazoline compounds were synthesized by vacuum process and solvent method, then the reaction conditions for the synthesis were optimized through orthogonal test. The effects of reaction condition on the product yields were discussed in the thesis. And then a series of imidazoline were synthesized by solvent method. The structure of the product was characterized by IR.2. Imidazoline compounds contains amidine were synthesized by indirect method using N,N-dimethylacetamide acetal. The effects of indirect method using N,N-dimethylacetamide acetal condition on the product yields were discussed in the thesis. A series of switchable imidazoline were synthesized by indirect method using N,N-dimethylacetamide acetal. The structure of the product was characterized by IR and high resolution.3. The route and method for the synthesis of N,N-dimethylacetamide acetal was improved and optimized in this paper. N,N-dimethylacetamide acetal was synthesized from N,N-dimethylacetamide and dimethyl sulfate via methylation reaction at 70℃and alcoholysis by dropping mixture of sodium methoxide and methanol at 0-5℃. The structure of the product was characterized by GC-MS and GC.4. The switchable performance of series of switchable imidazoline was evaluated by conductometer. This compounds show excellent switchable performance ethier in water or acetonitrile under four different conditions. Then the reaction conditions and the purification of compounds were discussed using switchable performance.5. The inhibiting performance of these compounds were evaluated by weight loss and electrochemical test. The corrosion inhibiting mechanism of these compounds were discussed. The series of switchable imidazoline show excellent inhibition properties for the corrosion of Q 235 carbon steel in saturated CO2 in 3% NaCl hydrosol.