Farouk H. Al-Hajjar

2-amino-thiazole and 2-amino-4,6-dimethylpyrimidine as corrosion inhibitors for copper

Abstract The cathodic and anodic behaviour of copper in tap water at pH values of 5, 7 and 9 has been studied at 50 ± 1°C in the presence of different concentrations of 2-amino-thiazole (ATZ) and 2-amino-4,6-dimethyl-pyrimidine (ADMP). The chemical nature of the complex formed between copper and ATZ or ADMP has been found in acidic solution to be a Cu(II) complex and to a lesser extent Cu(I) complex. The concentration of Cu(I) complex seems to increase as the solution becomes more basic. Polarization studies of the inhibition process suggest that the surface of the copper in both cases is largely covered by the complex.

REACTIONS OF ACETYLENIC KETONES WITH METHYL α‐NAPHTHYLACETATE. A SYNTHESIS OF 1‐AMINO‐2‐PYRIDONE DERIVATIVES

Reactions of acetylenic ketones (Ia-f) with methyl α-naphthylacetate in the presence of sodium methoxide gave the corresponding 6-aryl-3-α-naphthyl-4-phenyl-2-pyrones (IIa-f) which upon refluxing with hydrazine hydrate in ethanol gave the corresponding 1-amino-2-pyridone derivatives (VIa-f). The structure of the products was established by chemical and spectroscopic evidence.

Further experiments on the control of corrosion of mild steel in crude oil distillation

A still continuously refluxing kerosine and water with the addition of 3 ppm HCl and 800 ppm H2S was used to test the effect of 8 compounds upon the corrosion of mild steel over 1000 h. The organic inhibitors used included triazoles, thiones, hydrazides and a chlorochalcone. The most effective inhibitors over the temperature range investigated (50–180°C) were the hydrazides and the chlorochalcone. Other compounds were found to be reasonably effective at 50°C, but they became less effective as the temperature was increased.

Studies on Kuwait Crudes. II. Structural Analysis of Asphalts and Their Fractions by Nuclear Magnetic Resonance

Nuclear magnetic resonance methods were used for the determination of average structural formulae and formula weights of the saturate, naphthene-aromatic, and polar-aromatic fractions separated from asphalts by elution adsorption chromatography. The average formula weights are compared to molecular weights, showing fair agreement in the majority of cases. The more polar fractions of one asphalt had molecular weights up to 4 times the formula weights, while the less polar fractions had molecular weights in excellent agreement with formula weights. The aromaticity, the degree of substitution, the nonaromatic carbon in naphthenic rings, and the atomic hydrogen/carbon ratio of the fractions were discussed.