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Preparation of a Research Jet Fuel Composition Comprised of Nearly Exclusively Methyl-Branched Tetradecane Isomers Having a Freezing Point below −47 ℃. 赵云霞 2012.12.01. Abstract and Introduction. alternative aviation fuels

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2012 12 01

Preparation of a Research Jet FuelComposition Comprised of NearlyExclusively Methyl-Branched Tetradecane Isomers Having a FreezingPoint below −47℃

赵云霞

2012.12.01

abstract and introduction

Abstract and Introduction

alternative aviation fuels

1.potential fuels contains only a limited number of isomers

2.alternative fuels fail the distillation

distribution specification in current use

slide3

such an alternative blendstock were used to make a 50/50 alternative/petroleum blend

  • a generic surrogate research fuel comprised of isomers of tetradecane that meet the −47 ℃ freezing point specification of JP-8
slide4

1-tetradecene n-tetradecane

hydroisomerizedusing a Pt/US-Y zeolitecatalyst

raw tetradecane mixture is separated from cracked products by distillation

experimental section
EXPERIMENTAL SECTION

Fixed-Bed Catalytic Reactor System

0.5% Pt/US-Y ZeoliteHydroprocessingCatalyst

Producing n-Tetradecane

n-TetradecaneIsomerization

Separating C14 Isomers from Cracked Products

Freezing-Point Determinations

Solvent Dewaxing

results and discussion
RESULTS AND DISCUSSION

Hydrogenating the 1-Tetradecene

Isomerization of n-Tetradecane

slide10

C=0.81 C14-95% n-C14-23% -13℃

C=0.88 n-C14-7% -27℃

conclusions
CONCLUSIONS
  • a mixture of predominantly methyl-branched C14alkane isomers with a freezing point below −47 ℃
  • n-C14to hydroisomerization using a 0.5% Pt/US-Y zeolitecatalyst at a fractional conversion just under 0.9
  • The cracked products can be efficiently separated from the C14fraction via fractional vacuum distillation
  • the residual n-C14content must be reduced to <1.5 wt %.