MUMBAI, India, July 30 -- Intellectual Property India has published a patent application (202631082252 A) filed by National Institute Of Technology Durgapur on July 03, 2026, for Rashi 26: An Advanced Acid Corrosion Inhibitor System For Low Carbon Steel Based On Lawsone Derivative And Benzothiazole- Benzamides.
Inventors include Dr. Dipnkar Sukul; Ms. Rakhi Senapati; Mr. Srikaran S.; and Dr. Subhas Ghosal.
The application for the patent was published on July 24, 2026, under issue no. 30/2026.
Abstract: Abstract “RASHI 26: An Advanced Acid Corrosion Inhibitor System for Low Carbon Steel based on Lawsone Derivative and Benzothiazole-Benzamides” The present invention relates to a synergistic corrosion-inhibitor composition, RASHI 26, for protecting low-carbon steel in aggressive acidic environments. The composition comprises a lawsone derivative (0.3–0.5 wt%) (Figure 1), a benzothiazole–benzamide derivative (0.3–0.5 wt%) (Figure 2), potassium iodide (KI) (0.1–0.3 wt%) as a synergistic additive, and 1-methyl-2-pyrrolidone (NMP) (98.7–99.3 wt%) as a solvent medium. The RASHI 26 composition demonstrates an inhibition efficiency exceeding 98% at a low concentration of 1% v/v. The composition is particularly suitable for industrial applications and cleaning of boilers, heat exchangers and pipelines. Figure 1. Lawsone derivative Figure 2. Benzothiazole- benzamide derivative
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