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AE with ferric sulfate
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Perhaps there are better catalysts out there,

but ferric sulfate seems to work well according to this study:

http://web.aanet.com.au/rainfo..._biodiesel_paper.pdf

quote:
The traditional acid and the new two-step catalyzed processes for synthesis of biodiesel expressed as fatty acid methyl ester (FAME) were
comparatively studied to achieve an economic and practical method for utilization of waste cooking oil (WCO) from Chinese restaurants. WCO
samples with the acid value of 75.92 ± 0.04 mgKOH/g mixed with methanol were catalyzed under 95

C for various reaction time, followed
by methanol recovery under vacuum (10 ± 1 mmHg) at 50

C with a rotational evaporation. FAME analyzed by gas chromatography (GC) was
obtained directly from sulfuric acid catalyzed reaction in the traditional acid method, whereas in the two-step method it was produced from ferric
sulfate (2.0%) catalyzed reaction followed by alkali (1.0% potassium hydroxide) transesterification. The conversion of free fatty acids of WCO
into FAME in the two-step method was 97.22% at the reaction time of 4 h, mole ratio of methanol to TG of 10:1, compared in the acid method with
90%, 10 h, and 20:1, respectively, showing much higher catalyzed activity of ferric sulfate. This new two-step process showed advantages of no
acidic wastewater, high efficiency, low equipment cost, and easy recovery of catalyst compared with the limitations of acidic effluent, no reusable
catalyst and high cost of equipment in the traditional acid process.


There is also in it a simple formula to calculate the conversion:

Conversion(%) = (1- AV oil/AV WCO)* 100

AV = ACID VALUE = mg KOH/g oil

So I think we may simplify it to:

Conversion(%) = (1- Titration value after AE / Titration Value of WCO )* 100

Right ?

One awkward thing is that they use the amount of Methanol as a 10:1 molar ratio to the amount of triglycerides

I would have thought that it would be a molar ratio of Methanol to FFA



So anyhow, isn't this interesting ?

Greetings,

Dries
 
Registered: March 04, 2012Reply With QuoteReport This Post
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