Abstract: In the paper, an estimating method for critical properties in group-contributionmethod is
presented. For eliminating the influence of adjacent group anddistinguishing isomers, the
new method including first-level group-contributionmethod and second-level group-
contribution method is proposed. The new methoddemonstrates significant improvement in
accuracy.

Key words: group-contribution method, critical property, purecompoundminipage

摘要： In the paper, an estimating method for critical properties in group-contributionmethod is
presented. For eliminating the influence of adjacent group anddistinguishing isomers, the
new method including first-level group-contributionmethod and second-level group-
contribution method is proposed. The new methoddemonstrates significant improvement in
accuracy.

关键词: group-contribution method;critical property;purecompoundminipage