The issue of using acidic water as a terminator
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I would like to ask all my colleagues: since water in the feed oil can cause significant fluctuations in reaction pressure and temperature, and even lead to overpressure, will acidic water acting as a terminator have a similar effect on reaction pressure?
For water injection, it is sufficient to maintain a stable flow rate; the reaction temperature needs to be reduced significantly, otherwise the yield of liquid hydrocarbons will drop greatly
It can be used, but it needs to be controlled properly; there won’t be large fluctuations like those that occur when the raw material contains water
Some local refineries, in order to improve efficiency, have switched from using inhibitors to injecting water, and no negative effects have been observed. However, the latent heat of vaporization for water, crude steam, or other dirty oils is different, so it is necessary to control the amount used carefully.
When the amount of water in the feed material is significant, its impact is not limited to within the lift pipe. If 1% water content is taken into account, that amounts to just 1 ton per 100 tons of feed. The reason for significant changes in temperature and pressure is that the effect of the water starts at the feed pump; the pump itself may experience fluctuations in operation. Once the water vaporizes during heat exchange further down the pipeline, pressure in the section from the pump outlet to the lift pipe experiences large fluctuations. As a result, the material entering the lift pipe undergoes rapid changes due to these sudden pressure variations, which in turn causes substantial changes in the parameters of the reaction system. Steady water injection will not affect the feedstock system, allowing for stable reaction control.
Water in the raw material stream is present in the feeding section at the bottom of the reactor; acidic water is used as a terminator to lower the reaction temperature and shorten the reaction time. It does not affect the reactor pressure; the termination dose can be adjusted according to the reaction temperature.