Fractional Distillation of Crude Oil Essay

Aim To investigate the substances given off at different temperatures from crude oil (petroleum) categorisation.Apparatus* Fractional Distillation glasswork and thermometer* Clamp stand x 2* Conical flask* Supply of cold water* Rubber tubes x 2* Test tube wring from* Small glass block out tubes x 5* Rubber stopper x 5* Evaporating basinful* Micro Bunsen Burner and bench mat* wooden Splint* Stopwatch* Boiling stones* Crude Oil supplyMethod1. Set up the clamps stands and the fractionating glassw blood corpuscleic number 18 as shown in the diagram.2. Connect the rubber tubes to the 2 open tubes of the condenser.3. Connect the different end of the rubber tubing to a water tap and let the other one flow into a basin. upset on the tap.4. Place two boiling stones into the conical flask and then pour in the crude oil into the flask. Place the flask right preceding(prenominal) the micro-burner as shown in the diagram.5. Heat the crude oil mixture slowly. Record at which temperature one of the compounds in the mixture evaporate, and then collect it in the sharp test tube after it passes through the condenser.6. Repeat step 5 until maximum temperature has been reached and/or no much compounds evaporate.7. Test the compounds which were collected. Light them in an evaporating basin and record the time it takes to run out.ResultsData Table of Results of Hydrocarbons testedHydrocarbon CompoundBoiling Point Range (C)ColourViscosityPentane36 40 paleVery Low ViscosityHexane66 69ColourlessLow ViscosityHeptane90 94Very slightly cloudyViscous luculentKerosene (Paraffin) 250Brownish blackHigh ViscosityConclusionThese results prove to us that firstly, crude oil being a mixture of several hydrocarbons, that the mixture provided was a simulation. Secondly, there are noticeable trends in the hydrocarbons. As the molecules gets heavier and heavier, by which I mean that we go from pentane to Hexane and so on, the viscousness of the compound increases, as swell up as the time taken for it to burn up completely. The boiling point also increases.These hydrocarbons belong to the first organic homologous series Alkanes. Alkane molecules are completely saturated and each carbon atom has at least 2 hydrogen atoms attached to it. Apart from the two end carbon atoms, the other ones are attached to two other carbon atoms each. A covalent bond between a carbon atom and a hydrogen atom is strong, and a bond between two carbon atoms is also strong. It therefore takes a lot of energy to overcome this bond, and hence a higher temperature and more time is needed to break these compounds apart. The more carbon atoms an alkane possesses, the more energy is needed to break it apart. This explains the increasing boiling points, and is also one of the briny reasons why hydrocarbons are used as fuels.Kerosene was the only one of the four hydrocarbons which could not be heated to its boiling point and hence the temperature enter is the one that was given to us. It did, however, last the longest when it was burned. Therefore that result coincides with the one that was given to us. Its other properties which could be verified have given us gain proof of the fact that its temperature is higher than the other hydrocarbons.Also related to the viscosity, the weight of each hydrocarbon also increased as the viscosity increased. By the time kerosine was being handled, a really wide margin of difference could be felt from pentane.EvaluationWeaknessImprovement1The equipment available was not enough to determine the boiling point of KeroseneGet a macro burner and heat the kerosene to its boiling point2The difference in viscosity between the first two hydrocarbons was hard to tellMeasure the poise of the two compounds and record the difference3The evaporating basin in which the hydrocarbons were heated was the said(prenominal) all throughoutUse a different evaporating basin for each compounds so that the heat from the previous test does not affect the ne xt test4The main mixture provided to us was not actual crude oil, simply a simulated substituteTo gather all of the compounds found in crude oil use a mixture which contains all of them kind of obvious