Selection of type demulsifiers and electric dehydration tester

APT-2BSelection of type demulsifiers and testing instrument for electric desalination and water desalination performance

1、 Main technical parameters

1. Input voltage: AC220V~10% 50Hz

2. Output voltage: 0-6000V continuously adjustable (stepless adjustment of output AC voltage)

3. Electrode stations: 6

4Output AC current:0-100mA high voltage output (0-500mA low voltage output)

5. Heater power: 800W

6. Whole machine power: not exceeding 1000W

7. Automatic control range of heater temperature: can be set freely between room temperature and 140 ℃

8. Experimental temperature: Low temperature glass electrode: Room temperature~95 ℃

9. Temperature control accuracy: ± 1 ℃

10. Preheating time: When the temperature is preset at 75 ℃, the preheating time is about 15 minutes (the preheating time may vary slightly depending on the room temperature)

2、 Working principle

Crude oil contains a certain amount of water. During extraction and transportation, oil and water form emulsions due to collision, stirring, and friction. At the same time, in the process of crude oil desalination, water washing is mainly used to remove salts from the oil. Therefore, a certain amount of water must be injected first and the oil and water must be thoroughly mixed to form an emulsion. This emulsion exists in the form of oil in water or water in oil aggregates. Due to the natural emulsifiers such as gum and asphaltene in crude oil, they are less attracted by oil molecules and can be arranged at the oil-water interface to form a barrier. Therefore, emulsions are relatively stable and appropriate measures must be taken to break down, dehydrate, and desalinate. The process of electric desalination is essentially a dehydration process In order to improve dehydration efficiency, a small amount of demulsifier is often added during the dehydration process, for different types of demulsifiers and crude oils with different properties. It is necessary to select a more suitable demulsifier and appropriate dosage in order to achieve the goal of improving the demulsification water.

The principle of selecting demulsifiers with this instrument is to first take a certain amount of crude oil, add a certain amount of water in proportion, stir vigorously to fully emulsify the oil and water, and then take each one 100mLPour into six centrifuge bottles separately, then add a certain amount of demulsifier in sequence, and heat appropriately to reduce the viscosity of the crude oil. In addition, apply AC high voltage to generate a strong electric field, causing charge exchange between small oil droplets and small water droplets, achieving the purpose of electrical neutralization. Thus, the collision between droplets is strengthened and gradually coalesces and settles, achieving the purpose of dehydration. Then, the quality of the demulsifier is evaluated based on the amount of water poured or the measured chloride ion content in the water.