What determines the maximum value of the system pressure difference in hydrogenation?
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What factors determine the magnitude of the system pressure difference in hydrogenation?
The feed composition, feed volume, amount of fresh hydrogen, purity of recycled hydrogen, catalyst activity, and so on all play a role
Feed rate, compressor and feed pump power, etc
Catalyst bed pressure drop, raw material properties, amount and purity of recycled hydrogen, etc. What is particularly important is the estimation of the pressure difference; often, the properties of the raw material are worse than those assumed in the design, so the operating time does not reach the value specified in the design, yet the system’s pressure difference already reaches that level.
This post was last edited by libingtaoff8 on 2017-1-19 at 16:28. Factors such as processing volume, hydrogen-to-oil ratio, reaction pressure, properties of the feed oil, whether there is salt or coking in the catalyst bed, salt buildup in pipelines, the accuracy of pressure difference readings, and consulting the catalyst manufacturer to find out the maximum pressure difference that can be achieved – all these can be used to determine whether the catalyst has carbonized or been crushed. Compile statistical data on the reactor pressure difference; there are many influencing factors, and it is best to work in conjunction with the catalyst manufacturer.
The inlet and outlet pressures of the compressor, as well as the crush strength of the catalyst
There are many factors that influence the pressure difference in hydrogenation systems, including the properties of the feed oil, the pressure difference caused by fouling in heat exchangers, ammonium salt crystallization, the hydrogen-to-oil ratio, and the pressure difference within the reactor. In my opinion, determining the appropriate value for this pressure difference should be based on the maximum pressure difference specified in the reactor design, with particular attention paid to the pressure limits that the internal components of the reactor (such as crossbeams, cold hydrogen plates, spray plates, and support rings) can withstand. Pipeline scaling and ammonium salt crystallization occur as a result of gradual accumulation, while the increase in reactor pressure difference is related to factors such as catalyst coking and crushing, as well as impurities in the feedstock. Personal opinions are for reference only!