Abstract
Auther worked out the type analysis of alkylbenzenes in the aromatic fraction in the high boiling range petroleum. The amounts of primary, secondary and tertiary alkylbenzenes in the monosubstituted alkylbenzenes which have C3 and C4 alkyl group were individually determined.
The method of calculation in quantitative type analysis of alkyl group is as follows: The mass number of β-cleavage ion of alkylbenzene is known from the following equation:
m/e(β)=(B+14nQ)-(14k+1),
where:m/e(β)=mass number of β-cleavage ion of alkylbenzenes;
B=mass number of benzene ring;
n=number of alkyl groups;
Q=carbon number of alkyl group;
k=constant related to the type of alkyl group and Q
In case of the carbon number of alkyl group is three, the analytical values of primary and secondary alkylbenzenes are obtained by solving the two linear simultaneous equations concerned to the peak heights measured on the mass numbers derived from the above equation. The analytical values of primary, secondary and tertiary alkylbenzenes are similarly evaluated from the three linear simultaneous equations, when the carbon number of alkyl group is four. The number of alkyl groups on benzene ring and the carbon number of alkyl group are determined from the mass spectrometrically determined carbon number for the most abundant molecular ions.
