Use of isotopic analysis for determination of aromatic hydrocarbons produced from methane
AssigneeExxonMobil Chemical Patents Inc.
InventorLarry L. Iaccino
Life of this patent
Estimating the term…
Abstract
Benzene and xylene are described having a unique distribution of deuterium and 13C such that δ(deuterium) for each of the benzene and xylene is less than −250 and δ(13C) for the benzene is greater than −36 and for xylene is less than −24, wherein δ(deuterium)=(R′sample/R′standard−1)×1000 where R′sample is the ratio of deuterium to hydrogen in the benzene/xylene; and R′standard is the ratio of the natural abundance of deuterium to the natural abundance of hydrogen; and wherein δ(13C)=(R″sample/R″standard−1)×1000 where R″sample is the ratio of 13C to 12C in the benzene/xylene; and R″standard is the ratio of the natural abundance of 13C to the natural abundance of 12C.
Claims59
Benzene comprising deuterium and 13C in amounts in amounts such that δ(deuterium) for the benzene is less than −250 and δ(13C) for the benzene is greater than −36, wherein δ(deuterium) and δ(13C) are as defined as follows:
- δ(deuterium)=(R′sample/R′standard−1)×1000
- where R′sample is the ratio of deuterium to hydrogen in the benzene;
- and
- R′standard is the ratio of the natural abundance of deuterium to the natural abundance of hydrogen;
- and
- δ(13C)=(R″sample/R″standard−1)×1000
- where R″sample is the ratio of 13C to 12C in the benzene;
- and
- R″standard is the ratio of the natural abundance of 13C to the natural abundance of 12C.
Xylene comprising deuterium and 13C in amounts such that the δ(deuterium) value for the xylene is less than −250 and the δ(13C) value for the xylene is less than −24, wherein δ(deuterium) and δ(13C) are as defined as follows:
- δ(deuterium)=(R′sample/R′standard−1)×1000
- where R′sample is the ratio of deuterium to hydrogen in the xylene;
- and
- R′standard is the ratio of the natural abundance of deuterium to the natural abundance of hydrogen;
- and
- δ(13C)=(R″sample/R″standard−1)×1000
- where R″sample is the ratio of 13C to 12C in the xylene;
- and
- R″standard is the ratio of the natural abundance of 13C to the natural abundance of 12C.
A hydrocarbon product selected from toluene, cumene, ethylbenzene, styrene, polystyrene, phenol, polyethylene terephthalate, cyclohexane, and nylon and having δ(deuterium) and δ(13C) values within the ranges listed in Table 4.
In an aromatic hydrocarbon product selected from benzene and derivatives therefrom selected from the group consisting of cumene, xylene, ethylbenzene, styrene, polystyrene, phenol, polyethylene terephthalate, cyclohexane, and nylon, the improvement comprising said product containing a benzene ring comprising deuterium and 13C in amounts in amounts such that δ(deuterium) for the benzene is less than −250 and δ(13C) for the benzene is less than −24, wherein δ(deuterium) and δ(13C) are as defined as follows:
- δ(deuterium)=(R′sample/R′standard−1)×1000
- where R′sample is the ratio of deuterium to hydrogen in the benzene;
- and
- R′standard is the ratio of the natural abundance of deuterium to the natural abundance of hydrogen;
- and
- δ(13C)=(R″sample/R″standard −1)×1000
- where R″sample is the ratio of 13C to 12C in the benzene;
- and
- R″standard is the ratio of the natural abundance of 13C to the natural abundance of 12C, made by a process incorporating geologic methane in said benzene ring, whereby said product can be distinguished by mass spectrometry analysis.
Dependencies are inferred from the claim text.