New environment friendly corrosion inhibitor based on plant extracts and technology of chemical cleaning of thermal power equipment with its use

Abstract

Introduction. Improvement of environment ecological state is connected with ensuring stable anti-corrosion protection of the metal fund in chemical, gas and oil and energy industries. In particular, conducting high-quality chemical cleaning of thermal power equipment requires the use of effective eco-friendly corrosion inhibitors. Problem Statement. Insufficient attention is paid to the problem of creating eco-inhibitors despite the presence of plant raw materials in Ukraine in the form of wastes of food industry, wood processing, etc. Purpose. New environmentally friendly inhibitor based on plant extracts and the technology of chemical treatment of thermal power equipment with its use. Materials and Methods. Raw materials are oak chips and sawdust, extraction methods are based on the use of aqueous organic and mixed solvents, gravimetric and electrochemical methods for investigating the protective properties of extracts and synergistic compositions based on them, methods of analytical chemistry. Results. The developed eco-inhibitor is a synergistic composition based on oak extract with eco-friendly additives (xanthan gum, urotropin, thiourea, Siegnette salt, urea, technical glycerin and others). It has been found that the effectiveness of the inhibitor in 5% hydrochloric acid is more than 90%, the mechanism of its protective action is mixed and consists in adsorption of synergistic composite components. The presence of eco-inhibitor in the composition of washing solutions don't affect the completeness of dissolution of carbonate deposits as compared with non-inhibiting medium, but twice reduces time of removing salts and corrosion products from heatexchange surface of power engineering equipments. The technological regulations and temporary specifications for its synthesis and the technological instruction for acid-inhibitory cleaning of thermal power equipment have been developed. Conclusions. An experimental batch of eco-inhibitor has been obtained. The resulting product has passed laboratory and full-scale industrial tests that confirm its effectiveness in the composition of washing solution.