When cleaning isocyanates there are several methods and options. But some factors should be considered, as follows:

Is there a monoethanolamine vat system?

Is there a dedicated vat system for washing isocyanates?

Is there a high pressure (150 psi) boiler present?

If an MEA system is in use, then problem solved! Use 99% pure monoethanolamine, or John-Henry M-Pinge 99®

If no MEA system is available, but a dedicated vat is, then an option exists where a liquid caustic potash / John-Henry TC-555 blend will work very well. This is a method whereby the isocyanate will be pounded for 1-2 hours at 190°F with a high volume pump/spinner combination. 

Lastly, if no vat is available and you no not want to pass up profitable isocyanate washing, use John-Henry M-Pinge 99® as a vapor impingement cleaner. By pouring 15 gallons (ISO) or 30 gallons (Road Tanker) of M-Pinge 99 and then applying steam to the tank’s coils for 4 hours, the isocyanate will melt away into the solution. Capture for reuse, and rinse tank several times with hot water. Dry tank. 

NOTE: The contaminated solution can be used to clean 2 or 3 more tanks via vapor impingement.

MEA System

Use John-Henry M-Pinge 99® undiluted at 250°F (122°C)

Detergent Vat System

Use KOH / John-Henry TC-555® at the ratios specified on the Technical Data Sheet.

Vapor Impingement

Following the supplied SOP, pour John-Henry M-Pinge 99® into tank. Apply regulated steam (30 psi) to the tank’s coils for up to 4 hours. By maintaining 250°F for 2 hours all the isocyanate will be removed. Turn off steam and allow tank to cool until internal temperature falls below 185°F.

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Outside The Box Chemistry

Everything Has Changed

Polymer technology changes continually. Detergents and procedures that worked well ten years ago may no longer be effective. Perhaps some "Outside The Box" thinking will deliver the results you need.

Technical Data Sheets for products discussed in the this article

vapor impingement latex presolve
latex and resin presolve non hazardous
latex skin cutter
powdered latex detergent alkaline builder