Oil-water separation technology

The new oil-water separation filter material adopts the PTFE polymer solution produced in the United States and is added with lipophilic additives. After mixing, it is uniformly sintered on the stainless steel mesh plate, so that the surface of the filter material has hydrophobic and oleophilic effect, but the effect of non-sticky oil (surface Tension 18.5m N/m). When the oil is in contact with the filter medium, the oil droplets of the fine particles can be polymerized into large particles, and as the water flows, it gradually rises to the surface of the liquid to form an oil layer. The media area and size of the filter can be designed and installed according to the actual use. Generally, 500-1000 tons of products containing 90% oil slick are processed every hour.

I. Discussion on oil-water separation

Oil and water are both liquids, so the separation of the mixture of the two liquids is called liquid and liquid separation technology. When the two are mixed, they become a true solution. Due to the difference in the specific gravity of the oil and water, the oil floats on the surface. However, due to the oxidation, a part of the carboxyl group (-COOH) organic acid substance is formed in the oil-water mixture, and the water Hydroxyl (-OH) has an affinity and is spherical, commonly known as water-in-oil or oil-in-water, forming a stable emulsion.

When the water particles in the oil have a diameter of ≤0.4-0.7 μm, they are transparent, which is also called a true solution. It is difficult to separate the dissolved water in the true solution. In the past, the static precipitation method, the vacuum method, the centrifuge processing method, the warm distillation method, etc. are generally used, but the working conditions cannot be met. The main reason is that it is affected by the surface tension of the oil. Even if the water-in-oil is heated to 100-115 ° C, it will not vaporize, and it is difficult to separate the water in the fine oil-water particles.

The latest research proves that the water-in-oil granules can be broken by the demulsification process, and the water in the ≤0.4-0.7 μm particles is separated and aggregated into large particles, and the oil-water separation of the 5 μm particles is performed.

2. The latest method of oil-water separation

Our company's scientific research personnel and a number of domestic experts who have long been engaged in oil-water separation technology and polymer material research jointly research and develop new technologies for oil-water separation. After many trials and demonstrations, and drawing on the advanced technology design concepts of Douglas, Wayne, Hyde, and Frei, combined with the performance and price ratio of domestic raw materials. At present, it has been processed into products for use in the market and has achieved good results.

The new oil-water separation filter material researched and developed by our company adopts the PTFE polymer solution produced in the United States, and adds the lipophilic additive. After mixing, it is uniformly sintered on the stainless steel mesh plate, so that the surface of the filter material has hydrophobic and oleophilic, but not sticky. The effect of the oil (surface tension 18.5 m N/m). When the oil is in contact with the filter medium, the oil droplets of the fine particles can be polymerized into large particles, and as the water flows, it gradually rises to the surface of the liquid to form an oil layer. The media area and size of the filter can be designed and installed according to the actual use. Generally, 500-1000 tons of products containing 90% oil slick are processed every hour. The complete set of equipment can be adjusted according to the demand of the processed products. Or reduce the filter and move the device to any location.

Another filter material is a PTFE polymer solution produced in Japan, using the same processing technology. The surface tension of water in the filter material can reach: from 20 to 50 mm height, when the water drops freely drip on the surface of the filter material, there will be no water leakage on the back side of the filter material. According to the viscosity of the oil, the pore size of the stencil can be adjusted. Under normal circumstances, the diesel can reach 8-10 ppm/kg after separation, and the transformer oil can reach 2-5 ppm/kg.

The above two kinds of filter materials are applied in oil-water separation and oil slick collection, and have the characteristics of simple operation, high filtration efficiency and long service life. Especially when dealing with a large amount of mixed liquid, the effect is more obvious, and the running cost can be relatively reduced by 40 to 60%.

3. Main application fields of oil-water separation technology

1. Shipyard waste diesel oil filtration, demulsification, oil-water separation, water content 5 ~ 8 ppm / kg;
2. Transformer oil filtration, demulsification, oil-water separation, water content 2 ~ 5 ppm / kg;
3. Power plant turbine oil filtration, oil-water separation, decolorization, demulsification, fine filtration, water content 2 ~ 5 ppm / kg;
4. Treatment of offshore crude oil spills, collection, filtration, separation of oil and water;
5. Oil field floor oil filtration, cleaning, oil and water separation;
6. Offshore drilling platform oil collection, oil and water separation, heating separation, water content <100ppm/kg;
7. Oil collection, filtration, oil and water separation in the advection oil sedimentation tank of the steel plant;
8. A large amount of oily wastewater in the refinery is collected, filtered, and separated from oil and water.

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