hydrocracking
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Why must the temperature for hot hydrogen stripping be controlled at 260 degrees Celsius? Is there any theoretical support, or is it just experience?
What is your catalyst? Is the reaction bed a fixed-bed? If it is a cobalt-molybdenum catalyst with sulfide-based active components, should the issue of reduction be considered?
A temperature of 260°C is sufficient to evaporate the oil and gas; higher temperatures pose safety issues and result in high energy consumption.
It is determined based on the properties of the raw materials and the requirements for catalysts.
So you’re saying that this temperature is derived from experience, with no theoretical basis. If it is kept at 230 or 200, as long as the oil can be extracted.
The temperature for thermal hydrogen stripping is determined based on the properties of the catalyst and the feed components of the oil. In typical wax oil processing units, the stripping temperature is kept between 360 and 400 degrees to ensure that the oil components vaporize. However, when using high-temperature thermal hydrogen stripping, it is essential to strictly control the purity of the circulating hydrogen; if the required minimum level for hydrogen sulfide is 500, its concentration should be maintained above 1000. It may also be necessary to periodically add DMDS to prevent the catalyst from being reduced due to excessive hydrogen purity. High-temperature wax oils can only be vaporized and carried away by hydrogen when subjected to high-temperature thermal hydrogen stripping
It is determined by the properties of the catalyst and the oil; it depends on what type of hydrogenation is being used. What was said above covers it quite comprehensively
260°C is definitely too high! It is generally kept strictly below 230 degrees Celsius for one reason only: we are afraid that the catalyst will be reduced by hydrogen! Unless you perform sulfur injection, then the temperature is up to you!