What is the normal initial boiling point of deasphalted oil?
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I would like to ask the experts: what is the typical range for the initial boiling point of deasphalted oil? What is the relationship between deasphalted oil residue and the initial boiling point?
The initial boiling point of deasphalted oil is highly dependent on the properties of the raw material! The raw material is light in nature, so the initial boiling point of the deasphalted oil is low; if deep distillation is carried out in a vacuum distillation column, the initial boiling point increases! Moreover, the residue of deasphalted oil is related to the properties of the solvent and the raw materials as well as the operating temperature; it has little to do with the initial boiling point!
Could you give me a rough range for your initial boiling point? We’ve been below 350 for a long time; I’m a bit worried
We rarely determine the initial boiling point; we only analyze parameters such as residue and viscosity. A value below 350 indicates a problem on the upstream side, as the solvent deasphalting unit cannot control the initial boiling point of the light distillate Increasing the depth of decompression at the upstream stage by a slight amount can resolve this issue; appropriate adjustments can be made based on the requirements of the products manufactured by the company. Based on the characteristics of atmospheric and vacuum distillation, this process involves separating the fractions in crude oil with temperatures below 350 degrees, with some values being 360 degrees; taking into account the effect of overlapping temperatures, the estimated range is around 350–360 degrees!
I’m not worried about the downstream side; what concerns me is whether there might be diesel components with a concentration below 350 remaining in the system, causing solvent contamination
It should be wrong to be below 350! I mistook it and thought it was 450 degrees! A temperature below 350 degrees definitely indicates a problem; it is recommended to check whether contaminated diesel has mixed in and caused this issue!
Deasphalted oil does not require control of its initial boiling point; there is also no relationship between the residue content of deasphalted oil and its initial boiling point. Residue corresponds to the heavier components, while the initial boiling point corresponds to the lighter components.
1. Has the initial boiling point of the raw material been checked? 2. If solvent contamination is a concern, samples can be taken at the lowest point in the gas-liquid separation tank or solvent recovery tank (above the water layer) located behind the stripping tower. 3. All flushing oils must be completely sealed off.
We flush diesel under normal static pressure conditions, so it’s impossible for anything to get mixed in; there must be other reasons
A initial boiling point of 410 for the raw material is normal; it’s quite difficult to locate the sampling points. Thank you for your advice
Check the locations that are connected to the diesel line and have pressure levels that are roughly equal, such as the feed line and the pipeline that carries the product to the inlet of the product pump. The initial boiling point of the feed is 410, while that of the product is below 350. Apart from diesel, there are no other products in the entire solvent deasphalting unit that could have an impact! How long has this phenomenon been occurring? Was diesel carried into the solvent tank during operation? Looking forward to your solutions to the problems!