• Thick sludge or Coke deposits
• Pyrophorics
• Explosive and/or carcinogenic vapors

Although such maintenance cannot be avoided, it can be made easier and safer using modern technology. With this in mind, EnvTech has developed a decontamination process for heavy oil units that can be completed in less than 48 hours, and leaves the entire unit gas-free and ready for hot work.

In general each process unit is cleaned by recirculation of EcoSolvent ETI-927 using the unit's pumps. All vessels and exchangers are liquid filled except for large columns such as Main Fractionators or Vacuum Towers, which are cascaded. The solution is heated to a temperature range of 180*F to 200*F using process unit reboilers, furnaces, and/or direct steam injection. The goal is to provide adequate flow through the entire system while minimizing the amount of temporary connections and blinding required prior to the start of the cleaning. This system is suitable for both packed of tray type towers - it has proved equally successful in both applications.

EnvTech's proprietary EcoSolvent ETI-927, is recirculated with ETI Cleaning & Gas Freeing solution, which utilizes a strong buffer system in combination with appropriate chelants and surfactant in order to: neutralize polythionic acids on contact, dissolve all scales found in nearly any refinery process unit. This mixture also renders pyrophoric substances inactive. In addition, Benzene and other regulated air contaminants have been absent from the vapor spaces of vessels opened after these cleanings.

• EcoSolvent ETI-927 vastly improves the removal of asphaltenes, coke deposits, and heavy hydrocarbons.
• EcoSolvent ETI-927 is 100% biodegradable, and will have no ill effect on the environment.
• EcoSolvent ETI-927 is a non-hazardous product that may be safely handled and will have no ill effect on personnel.
• EcoSolvent ETI-927 creates a stable emulsion, which can be safely drained to Bio Treatment Plants.

Note: The stable emulsion created can be de-stabilized very easily if refinery-draining restrictions require this.

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