03.08.2015   Microbes and biochemistry of gas fermentation

Fatty acid composition

As can be observed from Table 5, regardless of the fatty acid profiles were observed in the biodiesel produced from frying oil, consisting mainly of methyl esters of oleic (C 18:1), pal­mitic (C 16:0), and stearic (C 18:0) acids (30.60, 3.0 and 66.40 % respectively) and 2.8 % un­known fatty acid. these results are in agreement with the results obtained by Predojvic (2008) who reported that, fatty acid profiles were observed in the biodiesels produced from sun flower oil consisting mainly of methyl esters of oleic (C 18:1), palmitic (C 16:0), linoleic (C 18:2) and stearic (C 18:0) acids.

Parameters

Feedstock

Produced biodiesel

Acid value mg KOH/g

5.1

0.48

Iodine value mg ^/g

62.0

60.0

Saponification value mg KOH/g

199.5

207.0

Table 4. Some chemical properties of waste cooking oil (WCO) used as feedstock for methyl esters preparation and produced biodiesel

Fatty acid ester

Carbon number chain

Wt%

Molecular formula

Palmetic

16

3.00

C16H 32O2

Stearic

18

66.40

C18H36°2

Oleic

18

30.60

C18H34O2

Table 5. Composition of biodiesel obtained by transesterification of WCO using GC

1.6. Bioethanol

1.6.1. Property of ethanol Melting point: -114.15 Boiling point: 78.3 Molecular formula: C2H5OH Molecular weight: 46.07 Specific gravity: 0.789 Toxicity: Get intoxicated

1.7. Biomethane

1.7.1. Gas properties

1.7.1.1. Molecular weight

• Molecular weight : 16.043 g/mol

1.7.1.2. Solid phase

• Melting point : -182.5 °C

• Latent heat of fusion (1,013 bar, at triple point) : 58.68 kJ/kg

1.7.1.3. Liquid phase

• Liquid density (1.013 bar at boiling point) : 422.62 kg/m3

• Liquid/gas equivalent (1.013 bar and 15 °C (59 °F)) : 630 vol/vol

• Boiling point (1.013 bar) : -161.6 °C

• Latent heat of vaporization (1.013 bar at boiling point) : 510 kJ/kg