Fractionation of biomass-based materials
A biomass and material technology, applied in the field of deasphalting, can solve the problems of product degradation, discolored products, loss, etc.
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Embodiment 1
[0079] Example 1: Thin film evaporator deasphalting vs. short path evaporator deasphalting, rosin and fatty acid losses relative to asphalt
[0080] Example 1 shows the use of two TFEs in series and figure 1 Differences in CTO deasphalting of the embodiments described in . These deasphalting alternatives were investigated. Model a thin film evaporator as a flash stage. In the short path evaporator model, a condensation stage is added after the flash stage.
[0081] The feedstock subjected to deasphalting consisted of dehydrated crude tall oil having 31 wt% free abietic acid, 45 wt% free fatty acid and 24 wt% neutral components such as unsaponifiables, oxidized rosin and esters.
[0082] When using two TFEs in series (ie the second deasphalting evaporator is a TFE), the final temperature of the latter TFE is the limiting factor, which is typically 250-320°C. A general concern is that too high a temperature will increase degradation reactions and affect the quality of the fi...
Embodiment 2
[0088] Example 2: Thin film evaporator deasphalting VS. short path evaporator deasphalting, degradation reaction
[0089] Tall oil fatty acid and abietic acid are known to decompose in distillation. The degradation reaction is temperature-time dependent. It is well known in the industry that the principle for estimating the rate of degradation is simple: Above 260°C, the degree of decomposition doubles for every 5°C increase in temperature.
[0090] In Example 2, the esterification reaction between fatty acids and sterols was studied in more detail in the second deasphalting evaporator. However, the aim was by no means to provide a detailed kinetic model for the reaction, but to illustrate the possibility of lower deasphalting temperatures in the second deasphalting evaporator. The bottom temperature is considered to be 300°C in TFE and 280°C in SPE.
[0091] The kinetic data of the esterification of linoleic acid and sterols was used to estimate the esterification reaction...
Embodiment 3
[0094] Embodiment 3: Effect of short-range deasphalting effect on the design of rosin tower
[0095] By using SPE in deasphalting, the feed to the rosin column is partially liquefied. In contrast, in the case of TFE-only deasphalting, the feed is entirely in the gas phase unless a separate condenser is used. In the case where the feed is completely evaporated, there is a large vapor load at the top of the rosin column. Therefore, the rectification section is required to be significantly wider than the stripping section in the design of the rosin column. In the inventors' experience, the overhead section generally causes most of the pressure drop in the rosin column, which increases the bottom sump temperature of the rosin column. In other words, the rectification section is usually too narrow.
[0096] In the case of SPE deasphalting, the vapor load in the rectification section is reduced. On the other hand, the steam duty in the stripping section increases due to a slight...
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