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We are observing very high water content in the diesel storage tanks in our refinery. The rundown diesel from the diesel hydrotreater unit has a low water content of 0.05vol% which is within specification. Paraflow additive is injected downstream the DHT unit to improve the cold flow properties in winter and this is the only stream which mixes with the rundown diesel before being routed to tanks. Tanks are also observed to have longer than normal settling time to displace water.
Has any refiner experienced emulsification properties or increased water content in the diesel product due to addition of paraflow?
 
Answers
12/02/2010 A: Marcello Ferrara, ITW SrL, mferrara@itw.it
We have developed a demulsifier, tailor made to separate water from diesel, which is very fastly acting, even with as low as 1 hour settling time.