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Efficiency upgrading of diesel fuel hydrodewaxing process us

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Galina Silko

on 27 May 2014

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Transcript of Efficiency upgrading of diesel fuel hydrodewaxing process us

Computer Modeling Systems
Investigation of Cold-flow Properties of Diesel Fuel
National Research Tomsk Polytechnic University
Institute of Natural Resources
Galina Y. Silko
Nataliya S. Belinskaya


Urgency and aim of research
Hydrodewaxing process flow sheet
Cold-flow properties of diesel fuel
Thermodynamic characteristics of reactions
Kinetic model of hydrodewaxing process
Influence of technological conditions
Optimum performance of process
Diesel fuel production


Addition of light fractions to diesel oil.
Addition of depressor additives.
Cold flow properties can be decreased by change of hydrocarbon composition -

hydrodewaxing process
()
THE AIM OF THE PRESENT WORK
Urgency of Research
Composition of raw materials
Hydrodewaxing process flow sheet
RAW MATERIALS:
Gasoline from hydrorefining
Gasoline from visbreaking
Middle distillates
Atmospheric gas oil

PROCESS CONDITIONS:
P-1 (hydrorefining reactor):
P=9.0 MPa, T=313 – 361 °C, Vkat=150 m3, kat: NiO-MoO3

P-2 (hydrorefining reactor):
P=8.8 MPa, T=338-398 °C, Vkat=151.2 m3, kat: NiO-MoO3
P-3 (hydrodewaxing reactor):
P=8.4 MPa, T=345-405 °C, Vkat=150 m3, kat: CoO-MoO3

PRODUCTS:
Gasoline
Petroleum gas
Diesel fractions 180 – 240 °C
Diesel fractions 240 – 340 °C
Fractions >340 °C

Formalized conversion scheme of hydrocarbons
Quantum-chemical methods
(program Gaussian)
DFT – Density Functional Theory,
B3LYP, basis 3-21G,
T=375 °C, P=6.9 MPa

Thermodynamic Characteristics of Reaction
Kinetic Model of Hydrodewaxing
Process
General view of kinetic model equations:

v – stoichiometric coefficient in corresponding reaction, Wj – rate of j-th reaction.

Kinetic Model of Hydrodewaxing
Process
General view of kinetic model equations:

v – stoichiometric coefficient in corresponding reaction, Wj – rate of j-th reaction.

Specific Reaction Rate
Influence of Temperature on Process
Increase of 60 °C in process temperature
CONCLUSION
Contents
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is to investigate cold-flow properties of diesel fuel using developed computer modelling system of hydrodewaxing process.
The
Cloud Point
is the temperature at which paraffin begins to form cloudy wax crystals.

The
Pour Point
is the temperature at which the paraffin in the fuel has crystallized to the point where the fuel gels and becomes resistant to flow.

The
Cold-filter plugging point
is the highest temperature at which a certain amount of fuel does not pass through a standard filter the set time under standard under cooling.

Two main reactions:

hydrocracking of high molecular isomerization of normal
weight linear paraffins C10–C27 paraffins

paraffins

naphthenes
aromatic hydrocarbons
unsaturated hydrocarbons
Melting point of n-paraffin and i-paraffin hydrocarbons
Solid phase sediment from diesel fuel
Hydrocarbons with
asymmetric branched structure

Hydrocarbons with
normal structure


During the hydrodewaxing process constant decrease in diesel fuel pour point is observed :

raw material – 1 °C,
hydrotreated feed (after 2 reactor) – minus 18 °C
isomerizate (after 3 reactor) – minus 25 °C.
CONCLUSION
content of n-paraffins C10 – C27 reduces by 2.18 % wt.
amount of i-paraffins increases by 1.06 % wt.
rate of hydrocracking reaction increases four-fold
rate of izomerization reaction increases two-fold
Cold flow properties of diesel fuels was investigated;

Computer modelling system of hydrodewaxing process was created;

Using the created mathematical model the influence of hydrogen gas flow rate and temperature on the yield of high-paraffins and iso-paraffins in the product was investigated.


Content of n-paraffins C10 – C27 in the product mixture decreases, which promotes improvement of cold-flow properties of diesel fuels.

The composition of raw material includes:
normal paraffin hydrocarbons C10–C27 with about 16.12 wt.%.

Content of n-paraffins C10–C27 after the third (hydrodewaxing) reactor is 10.17 wt.%.
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