US 10,584,292 B2Granted

Fuel compositions for controlling combustion in engines

AssigneeExxonMobil Research and Engineering Company

InventorsEugine Choi, Matthew W. Boland, Zhisheng Gao, Luca Salvi, Shamel Merchant, Bruce W. Crawley

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Abstract

Naphtha boiling range compositions are provided that can have improved combustion properties (relative to the research octane number of the composition) in spark ignition engines and/or compression ignition engines. The improved combustion properties can be achieved by controlling the total combined amounts of n-paraffins and isoparaffins that include a straight-chain propyl group (R1—CH2—CH2—CH2—R2). For such a straight-chain propyl group, R2 can correspond to any convenient CxHy group that can appear in a paraffin or isoparaffin. R1 can correspond to a hydrogen atom, making the straight-chain propyl group a terminal n-propyl group; or R1 can correspond to any convenient CxHy group that can appear in a paraffin or isoparaffin.

Claims11

Dependent claims

A method for making a modified naphtha boiling range composition, comprising:

adding a modifier composition to a first naphtha boiling range composition to provide a modified naphtha boiling range composition, wherein:
the modified naphtha boiling range composition has a RON of about 75 to about 110;
an ignition delay of the modified naphtha boiling range composition in a compression ignition engine is less than an ignition delay of the first naphtha boiling range composition in a compression ignition engine by at least 1.0 milliseconds;
the modifier composition increases the combined wt % of n-paraffins and isoparaffins that include a straight-chain propyl group in the modified naphtha boiling range composition;
a combined wt % of n-paraffins and isoparaffins that include a straight-chain propyl group in the first naphtha boiling range composition is less than (−1.273×RON+147.8) based on a total weight of the first naphtha boiling range composition, and
a combined wt % of n-paraffins and isoparaffins that include a straight-chain propyl group in the modified naphtha boiling range composition is greater than (−1.273×RON+147.8) based on a total weight of the modified naphtha boiling range composition.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/788,954Filed 20 Oct 2017 · us provisional application
Priority: 15 Nov 2016
Published: US 2018/0134978 A117 May 2018
Granted: 10 Mar 2020
Term ends: Not estimatedThe source records don’t support an estimate.

Classification13 codes

C10L 1/06
Essentially based on blends of hydrocarbons: for spark ignition
C10L 1/04
Liquid carbonaceous fuels: essentially based on blends of hydrocarbons
C10L 1/08
Essentially based on blends of hydrocarbons: for compression ignition
C10L 1/103
Containing additives: stabilisation of anti-knock agents