Heavy oil deep electrical desalting technology

The main raw material used in our company is M-100. Our electric desalination system manufacturer guarantees that the desalination rate can reach more than 90%. However, the actual situation is that even 70% is barely enough, so don’t expect deep electric desalination technology. It is more practical to choose an optimized electric desalination operation plan and select a good metal passivator.

Injecting desalting agent into the electric desalting system will be effective for some oil products

Regarding the desalination of heavy oil, I believe that the current problem of high salt content after desalination is mainly because the current of electrical desalination is generally large. I think the reason is mainly because the content of mechanical impurities in the oil is too high, and secondly, some oils contain too much calcium. I don’t know what the current of each factory is now? What is the throughput?

What the person above means is that a decalcifying agent needs to be added, so why is it so difficult to remove calcium without adding a decalcifying agent in electric desalting?

Our company processes heavy oil with a density of around 940. After desalination, the salt content can be less than 5ppm. We use the domestic mainstream AC and DC electric desalination technology. What the poster mentioned is fuel oil desalination, which I have never experienced. Regarding decalcification, I advise everyone to be cautious. We have tried it. No matter whether you choose domestic or imported, the corrosion is too severe!

Electric desalination technologies are all similar, don’t listen to their propaganda, but we use the technology of injecting light oil before desalting heavy oil (such as M100), which can increase the desalination rate to about 85% or even higher. In addition, catalytic black diesel oil can be injected before decolorization. Frequent vacuum distillation can decolorize, but the amount of refining should be paid attention to.

The blackening of catalytic diesel is probably caused by the high colloid content. Frequent vacuum distillation cannot modify it and must be hydrogenated. However, adding light diesel or other light dirty oil can effectively reduce the viscosity of fuel oil, which is definitely beneficial to fuel oil desalination.

The problem of crude oil decalcification cannot be eliminated with one stick. Theoretically speaking, since calcium mostly exists in the form of calcium naphthenate, it is difficult to remove. After adding a decalcifying agent, it is still effective from the data I have seen. The current will drop by about 40 amps. The performance of heavy urging can also illustrate the problem. The running time of the hood is lengthened and the catalyst consumption is reduced. Of course, since the decalcifying agent contains a lot of acid, it will cause corrosion problems. Therefore, attention must be paid to controlling the amount of acid added. In particular, it is key to accurately know the calcium content in the oil. This is very important because refineries often do not have data due to analytical instruments, so they cannot blindly add data. Generally, some crude oils from CNOOC have high calcium content, and some crude oils from Africa also have high calcium content. I haven’t encountered the others yet, and I’m sorry I haven’t seen enough of them. The decalcifying agent will cause serious corrosion to the mixing valve and will also have an adverse effect on the top of the tower. Three injections need to be strengthened. In addition, the high mechanical impurities of heavy oil are also a reason why it is difficult to remove, because it will cause high current and weaken the electric field effect. There is currently no good solution.

The decalcifying agent is generally oxalic acid, which is corrosive to equipment. At the same time, it combines with naphthenate to form naphthenic acid, which further increases the corrosion of equipment and pipelines.

This post was last edited by dou3261 on 2009-12-16 12:26 6# lizc8009 My major is water supply and drainage, and I agree with the original poster’s point of view. Whether heavy oil desalination can be started from another angle, adding water (steam), taking away the salt with water, and then removing the water, the key lies in whether it is economical and reliable. I hope that the views from the perspective of laymen and other professionals will be helpful to everyone. Generally speaking, electricity is an option, but the energy consumption can be very high and is not necessarily the most economical method. Adding light components to heavy oil can facilitate reaction and desalination, but there is a problem of consumption of light components. Experiments with different methods should be carried out and economic and technical evaluations should be carried out, because this research is of great significance to the entire refining industry. As a leader, it can create good conditions and reduce subsequent consumption. The corrosion problem caused by adding oxalic acid for decalcification can be solved by selecting appropriate materials. The key is to put forward process requirements. Lining materials such as ceramic may be feasible. One more thing to say, I didn’t pay enough attention to energy consumption in the past, and I hope everyone will pay attention to it, because energy consumption costs may be very helpful to the competitiveness of enterprises. A small amount makes a big difference, and a small amount of sand becomes a tower. In order to reduce consumption, as a "technical personnel", we should pay more attention to saving, and use everyone's meager strength to ensure that future generations can use oil and coal. This will add up to a grand saving effect. Add in the time effect, and we will have great merits. thank you for reading