Parametric and kinetics studies of dried pineapple (Ananas comosus) peels hydrolysis using sulfuric acid

Date

2011

Degree

Bachelor of Science in Chemical Engineering

College

College of Engineering and Agro-Industrial Technology (CEAT)

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Abstract

Dried pineapple p[eels in powderized form were subjected to parametric and kinetics studies. The parameters evaluated were the effect of pretreatment (unpretreated powderized peels and steam exploaded powderized peels), sulfuric acid concentration (20% and 35% v/v), and reaction temperature (30ºC, 50ºC, and 70ºC) on the hydrolysis reaction based on the reducing sugar concentration using Miller's DNS Method. the mean reducing sugar concentrations for pretreated and unpretreated samples were 2.29mg/mL and 5.90mg/mL, respectively. The reducing sugar concentration was higher in all runs using unpretreated sample which makes steam explosion an ineffective pretreatment option for powderized pineapple peels in this study. Only unpretreated powderized pineapple peels were studied for the effect of different sulfuric acid concentrations and different reaction temperatures. For the effect of acid concentration, higher, sulfuric concentration resulted to a corresponding higher reducing sugar concentration based on reducing sugar concentration of 3.03mg/mL using 20% v/v and 9.9mg/ml using 35% v/v sulfuric acid. However, increasing reaction temperatures gave lower concentration of reducing sugar. The maximum reducing sugar concentrations obtained using 355 v/v sulfuric acid at 30ºC, 509ºC, and 790ºC as reaction temperatures 11.10mg/mL, 9.22 mg/mL, and 7.73mg/mL. It was found out in this study that hydrolysis reaction of powderized dried pineapple peels follow first order reaction having a specific rate constant of 0.00106 min⁻¹.

Language

English

Location

UPLB College of Engineering and Agro-Industrial Technology (CEAT)

Call Number

LG 993.5 2011 E62 C37

Document Type

Thesis

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