What are the reasons for the low conversion rate in hydrocracking units? Discussion is welcome; extra points for sending flowers
Thread Content
As the title suggests, what are the reasons for the low conversion rate in hydrocracking units? Factors such as temperature, pressure, and nitrogen content – sailors, please discuss these more; those who provide helpful answers will be rewarded with flowers as encouragement. Let’s learn together – keep it up! ! ! ! !
There are many reasons why it cannot be split: the properties and composition of the raw material (is it easy to split? ), whether the reaction temperature and pressure are appropriate, the purity of the recycled hydrogen, catalyst performance, water injection conditions, the effectiveness of hydroprocessing.......
Your question is too broad to answer; it’s usually a matter of mass transfer, I guess
Let’s start with the properties of the raw materials – what is the typical nitrogen content? The level of refined oil should be kept at no more than 10 ppm; how often should samples be taken?
Do two samples of refined oil per shift? ? 、
Hydrogen partial pressure, hydrogen purity, cracking temperature, coking wax ratio, crude oil properties, etc., are compared with previous parameters
At high nitrogen levels, prior to cracking, the nitrogen in the oil is converted into ammonia under the action of a hydrogenation catalyst; this ammonia then binds to the acidic sites of the cracking agent, reducing its acidity and thereby lowering the cracking conversion rate.
It depends on your specific parameters: the boiling range, properties, composition of the raw materials, as well as the processing procedures and related parameters
A low conversion rate means that the current process parameters of your device (temperature, pressure) are not sufficient to meet the conditions required for breaking the molecular bonds of your raw materials. As for sulfur, nitrogen, and oxygen in the raw materials, they should not affect the conversion rate. It will only affect your long-term operation or the conversion rate toward the end of the operation.