Dehydration issues in crude oil and used oil
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Could any expert help solve the problem of dehydrating crude oil and used oil, which have a water content of 30%-40%? What is the simplest and most convenient method for dehydration?
With a high water content, first carry out settlement and dehydration in the irrigation area, and then use electrodesalination and demulsifiers for dehydration
Reply to 2# Qiuhuipingchuan: Should an emulsifier be added for settlement and dewatering in the irrigation area?
Oils have varying properties, and there are many factors that affect emulsification. The performance of demulsifiers also varies greatly. It is best to conduct experiments first to determine the dehydration conditions, and then follow the procedures outlined on page 2
To address settlement in the tank area, demulsifiers can be used; it is also advisable to raise the temperature of the tank area, generally to within 90 degrees Celsius. The demulsifier definitely needs to be selected through experimentation; you should contact the demulsifier manufacturer, who will be responsible for taking oil samples and selecting the appropriate demulsifier.
The reason for the excessive water content is an increase in oil-in-water emulsions in the crude oil, along with enhanced mixing strength and improved stability; it is therefore necessary to choose an appropriate demulsifier (a reverse demulsifier), which will help resolve the issue
I also support settling and dewatering first, then adding a demulsifier, followed by cyclone dewatering, and finally electrodesalination for dewatering.
First, allow natural sedimentation, then raise the temperature to 100°C, and finally dry and dehydrate it in a vacuum tank.
It depends on the viscosity and density of the cost. The method of coalescence multiplication is a simple, energy-efficient, and effective approach