COMPOSITION FOR REMOVING HIGH-TEMPERATURE MINERAL SALT DEPOSITS FROM THERMAL POWER EQUIPMENT

• Main Authors: VAN'KOV A.L, ARONOV M.S, DRIKER B.N, KHROMTSOVA A.Z, TSIRUL'NIKOVA N.V
• Format: Patent
• Language: English
• Published: 27.12.2001
• Edition: 7
• Subjects: CHEMICAL SURFACE TREATMENT; CHEMISTRY; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING MATERIAL WITH METALLIC MATERIAL; COATING METALLIC MATERIAL; DIFFUSION TREATMENT OF METALLIC MATERIAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; METALLURGY; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLICMATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASSC23 AND AT LEAST ONEPROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25; NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE

thermal power industry, particularly, chemical cleaning from high-temperature mineral deposits of steam and hot-water boilers. SUBSTANCE: composition comprises nitrile (methylenephosphonic) acid, methyliminodimethylene phosphonic acid, hydrochloric acid and acid corrosion inhibitor, ratios of components being as follows, wt.%: nitriletri-(methylenephosphonic) acid, 14-16; methylimino dimethylene phosphonic acid, 4-7; hydrochloric acid, 1-14; acid corrosion inhibitor, 0.5-1.0; and water, the balance. EFFECT: removal of high-temperature mineral deposits, improved cleaning efficiency, reduced volume of sewage after washing operation.