Treated Rhizophora mucronata tannin as a corrosion inhibitor in chloride solution

Treated Rhizopora mucronata tannin (RMT) as a corrosion inhibitor for carbon steel and copper in oil and gas facilities was investigated. Corrosion rate of carbon-steel and copper in 3wt% NaCl solution by RMT was studied using chemical (weight loss method) and spectroscopic (FTIR) techniques at various temperatures in the ranges of 26–90C. The weight loss data was compared to the electrochemical by the application of Faraday’s law for the conversion of corrosion rate data from one system to another. The inhibitive efficiency of RMT was compared with commercial inhibitor sodium benzotriazole (BTA-S). The best concentration of RMT was 20% (w/v), increase in concentration of RMT decreased the corrosion rate and increased the inhibitive efficiency. Increase in temperature increased the corrosion rate and decreased the inhibitive efficiency but, the rate of corrosion was mild with RMT. The FTIR result shows the presence of hydroxyl group, aromatic group, esters and the substituted benzene group indicating the purity of the tannin. The trend of RMT was similar to that of BTA-S, but its inhibitive efficiency for carbon-steel was poor (6%) compared to RMT (59%). BTA-S was efficient for copper (76%) compared to RMT (74%) at 40% (w/v) and 20% (w/v) concentration respectively. RMT was efficient even at low concentration therefore, the use of RMT as a cost effective and environmentally friendly corrosion inhibiting agent for carbon steel and copper is herein proposed

Reinvestigation of the crystal structure of β-alanine

A reinvestigation of the crystal structure of β-alanine was carried out. The structure is orthorhombic, space group Pbca, with eight molecules per unit cell. Cell parameters were a = 9.882 (2), b = 13.807 (2), and c = 6.086 (2) Å. Three-dimensional intensity data collected in a CAD-4 diffractometer using Cu K α radiation was used in the least-squares refinement leading to a final R value of 0.038. The average standard deviations in bond lengths and angles were 0.002 Å and 0.2°, respectively. The corresponding values in the earlier work of José & Pant (1965) were 0.01 Å and 0.6°, respectively. The positions of all the hydrogen atoms were located in the present study. The amino nitrogen forms three hydrogen bonds of nearly equal bond lengths and angles, with the oxygen atoms. The β-alanine molecules exist in the crystal as zwitterions