Klincewicz method

The quality of the Klincewicz method is not superior to older methods, especially the method of Ambrose[2] gives somewhat better results as stated by the original authors and by Reid et al.[3] The advantage of the Klincewicz method is that it is less complex.

The quality and complexity of the Klincewicz method is comparable to the Lydersen method[4] from 1955 which has been used widely in chemical engineering.

The aspect where the Klincewicz method is unique and useful[3] are the alternative equations where only very basic molecular data like the molecular weight and the atom count are used.

The diagrams show estimated critical data of hydrocarbons together with experimental data.[5] An estimation would be perfect if all data points would lie directly on the diagonal line. Only the simple correlation of the Klincewicz method with the molecular weight and the atom count have been used in this example.

• 
  Critical temperatures
• 
  Critical pressures
• 
  Critical volumes

${\displaystyle T_{c}\,=\,45.40-0.77*MW+1.55*T_{b}+\sum _{j=1}^{35}n_{j}\Delta _{j}}$

${\displaystyle (MW/P_{c})^{1/2}\,=\,0.348+0.0159*MW+\sum _{j=1}^{35}n_{j}\Delta _{j}}$

${\displaystyle V_{c}\,=\,25.2+2.80*MW+\sum _{j=1}^{35}n_{j}\Delta _{j}}$

${\displaystyle T_{c}\,=\,50.2-0.16*MW+1.41*T_{b}}$

${\displaystyle (MW/P_{c})^{1/2}\,=\,0.335+0.009*MW+0.019A}$

${\displaystyle V_{c}\,=\,20.1+0.88*MW+13.4*A}$

with

	-CH3		>C=O (nonring)
Property	No. of groups	Group value	No. of groups	Group value	${\displaystyle \sum n_{j}\Delta _{j}}$	Estimated Value	Unit
Tc	2	-2.433	1	4.332	-0.534	510.4819*	K
Pc	2	0.026	1	-0.196	-0.144	45.69	bar
Vc	2	16.2	1	-6.7	25.7	213.524	cm3/mol

*used normal boiling point T_b= 329.250 K

Used molecular weight: 58.080 ^g/_mol

Used atom count: 10

For comparison, experimental values for Tc, Pc and Vc are 508.1 K, 47.0 bar and 209 cm³/mol, respectively.[3]