Piper is the most important genus belonging to the Piperaceae family with its distribution in tropical and neotropical regions. With antimicrobial and antifungal properties this genus is widely used to inhibit pests. Its family is known to manifest secondary metabolites in its composition as: phenylpropanoids e terpenes. In addition,
the family has its economic importance and also its use for medicinal purposes. The essential oils of the species Piper divaricatum and Piper callosum, had yields of 1.9% for Piper divaricatum and 1.7% for Piper callosum. The majority of the constituents of these oils are phenylpropanoids such as methyleugenol (38.46%) and eugenol
(24.29%), which corresponds to the plant Piper divaricatum. Piper callosum presents in its chemical composition the major constituents the hydrocarbons and phenylpropanoid as: α-Pinene (8.12%), β-Pinene (18.03) and Safrol (50.59%) respectively. Due to the importance in the knowledge of physical and thermodynamic
properties of pure substances in the development of engineering process simulations, this present work aimed at analyzing methods for predicting the critical properties of the majority compounds of the collected species, taking into account structures that present only carbons and hydrogenes that can be cyclic, acyclic and isomer chains, and for molecules that present carbons, hydrogenes and oxygen in their structures, from the acyclic, cyclic and isomer chain. When analyzing the best method compared to the literature, the critical properties of the majority constituents of Piper divaricatum
and Piper callosum essential oils were calculated.
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