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This post was last edited and deleted by Chen Wentao on 2016-11-27 21:59
Aren’t the raw materials and recycled isobutane dehydrated at low temperature in the coalescer?
The design is like this, but dehydration is a problem. Ordinary coalescers, even similar foreign products, are useless. The most important thing is to truly and effectively remove free water and partially dissolved water. Whether the problem can be solved depends on the equipment. However, this is only part of the reason. What is more important is that the reaction temperature is high. The strong oxidizing property of sulfuric acid reacts with hydrocarbons to form water. This is the most important thing. In the sulfuric acid process, both the Lumus process and the DuPont process will have the problem of water in the raw materials. The low acid consumption of Lumus is due to the low reaction temperature, which inhibits the formation of the oxidation reaction. However, the water content in the raw materials cannot be solved, and the acid consumption is not low. Many of them are more than 100 kilograms per ton, and there is no 50 kilograms per ton of the original version.
The coalescer can only remove free water. Whose coalescer can remove dissolved water? Please let me know.
At low temperatures, some dissolved water will precipitate out
At low temperatures, some dissolved water will precipitate out
The author's analysis is very thorough and worth learning.* .
In fact, whether it is the Zhida version or the DuPont version, the principle of the raw material and product heat exchanger is the same. The temperature of the material in Zhida's low-temperature method is not much different from the material temperature after flash evaporation in DuPont. A large enough flash tank has a very low material side temperature. The products of both processes are directly absorbed by flash evaporation. This The condensation principle of the block is the same, except that part of the dissolved water is removed, and there is still dissolved water below 200ppm. There is also a lot of dissolved water. The strong water absorption of concentrated sulfuric acid is reflected in this process. This water absorption process is continuous. Even Zhida's low-temperature method cannot eliminate this problem. Water is also a problem in the low-temperature method. However, the overall process is one or two grades better than the DuPont method. I still recommend the Zhida version. It is cheap, has low energy consumption, has a large processing capacity, occupies a slightly smaller area, is more advanced in process, has less corrosion problems, and has a longer operating time.
In order to reduce the water content and feed temperature, high-efficiency heat exchangers or plate heat exchangers can be replaced or connected in series. There are many modifications to this stuff. However, the removal of dissolved water is a problem, and the best level of removal is also a question!
I don’t really understand what the poster said. The water in the raw materials has nothing to do with the process. Isn’t it just dehydration through the raw material coalescer to below 10~15ppm?