What is the optimal temperature for dehydration of C4 mixed feedstock?
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The C4 mixed feedstock (primarily a mixture of alkanes and olefins, with small amounts of impurities) enters the coalescer for dehydration after heat exchange; the temperature of this mixed stream can be kept above 0° and below 15°. What is the optimal temperature for feeding this material into the coalescer for dehydration?
In your temperature range, 15 degrees is very good
As I understand it, the dewatering function of a coalescer can remove free water; however, the dissolved water in the continuous phase cannot be removed. During the process, a decrease in temperature downstream of the coalescer or differences in temperature can cause the dissolved water to precipitate. It is inaccurate to conclude that the performance of the coalescer is unsatisfactory. Theoretically, a lower temperature before entering the coalescer should help it remove water more effectively, but in practical operations other relevant factors within the process must also be taken into account. It is recommended to consult the dissolution curve of water in that hydrocarbon and consider the requirements of the process in order to determine an appropriate feed temperature.
The coalescer itself is a type of process equipment; its selection depends on your own process design, rather than designing the process to meet the requirements of the coalescer. Temperature has little impact on the separation of C4 from water, as C4 itself has a very low viscosity that changes little with temperature; therefore, insulation and heat tracing are used in equipment at lower temperatures. Temperature is not a factor affecting the removal of free water in C4; the most important factor is the degree of emulsification of water in C4. The liquid-liquid coalescer belongs to the category of heterogeneous separation; it is capable of removing the emulsified water and free water present in butane. The free water content in butane at the outlet of the coalescer can be reduced to
I would like to know what the efficiency of mixed C4 dehydration is, what results can be achieved, and which manufacturers of equipment or universities have conducted good research in this area?