Hydrogenation design
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Hydrogenation technology: Why do some have high heat, some low heat, and some none at all?
In the hot high-split process, most of the reaction products are sent directly to the distillation system at a higher temperature that meets the requirements of downstream processes, without going through cooling or further heat exchange. The advantages include: a large amount of reaction products can be discharged directly from the hot high-split stage, which saves space required for heat exchange; gas-liquid separation is thorough, resulting in energy savings and reduced consumption. In the cold high-split process, the separation temperature is lowered, allowing for the separation of oil, gas, and liquid at a lower temperature. This approach enhances the ability of the resulting oil to dissolve light hydrocarbons and reduces its solubility for recycled hydrogen, thereby achieving a higher hydrogen recovery rate and improving the purity of the recycled hydrogen. The hot low-split process involves a second round of separation of the oil from the hot high-split stage at a lower temperature, further enabling hydrogen recovery, while using the hot oil as a heat feed for the distillation system – thus achieving energy savings and reduced consumption. Cold low-grade separation is the secondary separation of cold high-grade oil
In the anthracene oil hydrogenation process I used to carry out, it started with thermal high fractionation to separate light components, followed by cold high fractionation and then cold low fractionation; the heavier components from thermal high fractionation were then cracked
I’ve seen what you’re talking about. I want to know why the design is different; since the factory has changed now, I can’t figure it out
In short, the kinetic energy from hot fractions with high temperatures is converted into mechanical energy (via the hydraulic turbine of the hydrogen feed pump), while hot fractions with lower temperatures are better suited for hydrogen recovery