AbstractDiscussionConclusion LLE SAIFUL

7/17/2019 AbstractDiscussionConclusion LLE SAIFUL

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Abstract

The liquid-liquid extraction process is one of the most common technique to separate

compounds based on their solution preferences for two different immiscible liquids, usually

water and an organic solvent as in our experiment, a mixture of different phases of materials

(light and heavy phases) that have different physical and chemical properties are to be separated

by liquid-liquid extraction method. Our focus in this experiment is to examine how the change in

flow rate can affect the whole extraction process efficiency taing into account the variables that

are involved in this process including concentration of liquid, temperature and pressure inside the

column. !e can see how great impact the change in flow rate can mae through the result. "or

this experiment, we conduct two experiments which are based on the solubility. "irst experiment

conducted, we used separators funnel to separate two solutions of different solubility and

densities, and then titrate with #aO$. The values for distribution coefficient by titration %.&' in

&. ml of propionic acid, .&%' in *. ml propionic acid and %.+&+ in %. ml propionic acid. #ext

for the second experiment, we used liquid-liquid extraction column to obtain feed, raffinate and

extract samples. The samples were titrated with different of #aO$ concentration which are .%

and .&. The experiment was successfully done completely.



Discussion

!e conduct this experiment to determine the distribution of coefficient and to determine the

mass transfer coefficient. This experiment is based on the solubility, the solvent is also soluble

with a specific solute contained in the solution. This is the separation of a substance from a

mixture by preferentially dissolving the substance in a suitable solvent. The first experiment conducted which is to determine the distribution coefficient,

we used titration method from the upper () and bottom () layer sample. The values for

distribution coefficient by titration with #aO$ are %.&' in &. ml of propionic acid, .&%' in *.

ml propionic acid and %.+&+ in %. ml propionic acid. "or the second experiment, we used liquid-liquid extraction column to obtain feed,

raffinate and extract samples. The samples were titrated with different of #aO$ concentration

which are .% and .&.

/n the first experiment, from the result if titrated with .% #aO$, it shows that the

value of distribution coefficient decrease as the volume of propionic acid increase. 0ame as when

titrated with .& #aO$, the value of distribution coefficient decrease as the volume of

propionic acid increases.

"or the second experiment, it shows that the increase of mass transfer rate as the

concentration decrease. Thus we can summari1e that the value of mass transfer rate is varies

when the concentration of #aO$ decrease.

2uring titration we choose phenophtalein as the indicator. /ts turn pinish-purple

colour during the titration, but to get all the same colour might be hard enough to classify. 3s the

colour is not constant, the value of mass transfer coefficient and distribution coefficient will be

different from the actual. The colour pinish-purple indicates that the #aO$ is at the equilibrium

with the sample solution.



"or experiment , we can see from the result that the concentration of propionic acid in

raffinate is more than in extract. The concentration of propionic acid should more in extract than

in the raffinate. !e can assume that the extraction does not occur efficiently and more time

needed to extract the solution.

The value from this experiment might be different from the actual. This might be

because of several error occur during this experiment. The varies result might caused by the oil

emission and impurities at the beaer, conical flas and burette. !e can avoid this error by rinse

and clean the apparatus before start the experiment. Other than that, the most common error that

always occur during the experiment is the position of the eyes while taing reading at the burette.

The eyes should be straight to the scale and must be perpendicular to the meniscus. oreover to

get the best and accurate result the experiment should be repeated at least * times and the error

during the experiment progress can be determined.

Conclusion



"orm the experiment %, we can conclude that the value for distribution can be determine by

titration with #aO$ are %.+&+ in %. ml of propionic acid, .&%' in *. ml propionic acid and

%.&' in & ml propionic acid.

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AbstractDiscussionConclusion LLE SAIFUL