biodiesel unit terminal objective 2: performance · pdf file · 2012-03-094....

Developed by the Engineering and Technology

Curriculum Team ©2008—www.etcurr.com Biodiesel Lesson 2 – page 1

Biodiesel Unit

Lesson 2

Terminal Objective 2: produce biodiesel

Performance Objective 2: Given unused cooking oil, necessary equipment and chemicals,

produce biodiesel that is free of soap, dry, and ready for testing.

Enabling Objectives:

• describe safety practices for the production of biodiesel

• describe the major steps to produce biodiesel from cooking oil

• match equipment needed for the production of biodiesel

• indicate why cooking oil is heated to 138 °F prior to adding the catalyst

• describe two molecular properties that affect the separation of liquids

• illustrate emulsification

• utilize Material Safety Data Sheets (MSDS) related to biodiesel production

Laboratory Hardware: Several pieces of equipment will be needed to perform this lab.

• Bottle and Cap – Every team will need one bottle with a tight fitting cap. The bottle

needs to be resistive to the corrosive elements of the chemicals that are being used.

Glass is good but breaks, so be careful.

• Drying pan – A Pyrex meatloaf pan works great.

• Filter paper – Removes particles from final product. We use Whatman cat. #1002-125

• Funnel – Glass funnels are good but not necessary since the chemicals don’t stay in

them very long. Like the graduated cylinder, one is necessary, one per group is better.

• Graduated cylinder – It is possible to use one graduated cylinder in the lab but it

should be well cleaned after each use. It is easier to have several graduated cylinders;

one for methanol, one for oil and one for washing.

• Hot plate – Better if not a flame. Used to heat cooking oil.

• Metal pot – For heating cooking oil. If the pot has a metal handle, a hot pad will be

necessary.

• Rocker – Not necessary but good. Drying takes longer otherwise.

• Scale – A scale to measure weight is needed. For this lab, the scale needs to be able

to measure in grams with an accuracy of 0.1g.

• Separating funnel – It is possible to use only one but best to have one per group.

• Thermometer – For monitoring cooking oil temperature. Needs to go above 138 °F.

Learning Activities:

2.1 Participate in power point presentation.

2.2 Complete worksheet, Activity Sheet 2.1, Making biodiesel.

2.3 Pass safety quiz with no questions missed.

2.4 Produce biodiesel in laboratory.



Formative Assessment: 1. The worksheet, Activity Sheet 2.1, Making Biodiesel, will be used to assess student

progress. The answers to Activity Sheet 2.1 are as follows:

Section 2.1

1. Splash-proof goggles

2. Wash hands

3. They could be harmful or fatal

4. Work in a well ventilated area or under a fume hood.

5. Always follow directions and never perform an unauthorized experiment.

6. Never return unused chemicals to their original container.

7. Ask the teacher or consult the MSDS.

Section 2.2

1. Immediately flush eyes with plenty of water for at least 15 minutes, occasionally

lifting the upper and lower eyelids. Get medical aid immediately.

2. Dry chemical, foam, CO2.

3. Combustible materials.

4. Keep in tightly closed containers, stored in a cool, dry, ventilated area. Protect

against physical damage. Separate from incompatibles.

Section 2.3

1. F

2. A

3. J

4. D

5. B

6. H

7. E

8. I

9. G

10. K

11. C

Section 2.4

1. C

2. G

3. D

4. A

5. B

6. F

7. E

Section 2.5

1. Decrease reaction time without boiling off methanol.

2. Polar molecules are polarized.



3. Specific gravity is a measure of density

4. (Something similar to the picture on lesson slide #12 depicting emulsion.

2. The safety quiz will also be used to indicate student progress. The answers to the

safety test are as follows:

1. T

2. T

3. F

4. T

5. F

6. F

7. F

Summative Assessment: 1. A performance evaluation check sheet is used to grade student progress on an

acceptable/unacceptable basis (see form at the end of this lesson). Five items are

evaluated: two dealing with the process and three dealing with the product.

Process Evaluation

1. Did the students follow good safety practices?

2. Did the students keep the area clean and neat while working? Did they clean up

afterwards?

Product Evaluation

3. Soap test—is there soap in the final product?

4. Is the fuel dry—can fine print be read through the biodiesel?

5. Is the reaction complete—did the fuel pass a modified Jan Warnqvist’s conversion

test?

Soap test

Using a small sample of the final product, mix it with water and shake vigorously. If

the water and biodiesel separate after approximately 15 – 30 minutes, then there

should be no soap left in the biodiesel.

Jan Warnqvist's Conversion Test (3/27 test)

This is a quick acceptable/unacceptable conversion test for your biodiesel and works

because biodiesel will dissolve into methanol while triglycerides do not dissolve in

methanol. It works with washed and dried, or unwashed biodiesel that is well settled.

Procedure

1. Insure the jar is spotlessly clean and dry.

2. Put 27ml of room temperature (20- 22deg C) methanol into the jar.

3. Use the syringe to put exactly 3ml of the room temperature biodiesel under

test into the methanol.



4. Put top on Jar.

5. Shake jar hard for 5 seconds.

Note: If the biodiesel completely dissolves into the methanol and no biodiesel

settles out on the bottom of the container, you have very high conversion

biodiesel.

2. The following test items could be used to measure the enabling and terminal objectives

on a unit or end-of-level test:

1. In the biodiesel-making process, the step—wash biodiesel, which of the following

materials was removed?

a. glycerin

b. soap

c. unreacted methanol, MeOH

d. unreacted oil

2. In which step does the chemical reaction take place producing biodiesel?

a. heat cooking oil

b. mix catalyst with MeOH

c. mix oil with catalyst and MeOH

d. separate biodiesel and glycerin

3. If not followed precisely, which step would result in a slow reaction or a loss of

methanol?

a. heat cooking oil

b. mix oil with catalyst and MeOH

c. separate biodiesel and glycerin

d. wash biodiesel

4. Methanol boils at what temperature (at sea level)?

a. 98.6 °F

b. 123 °F

c. 148 °F

d. 212 °F

5. What is a physical property that helps determine if another liquid is water soluble?

a. boiling point

b. color

c. polarity

d. specific gravity



6. Which physical property of a liquid relates to that liquid’s density?

a. boiling point

b. color

c. polarity

d. specific gravity

7. Emulsification of biodiesel in soapy water occurs because a drop of biodiesel

becomes surrounded by:

a. carbon chain tails

b. glycerin

c. methanol (MeOH)

d. polar heads

8. If cooking oil is only partially reacted, it will fail which test?

a. clarity test

b. 3/27 test

c. safety test

d. soap test

9. If the biodiesel is cloudy, it contains:

a. glycerin

b. excess methanol (MeOH)

c. soap

d. water


Curriculum Team ©2008—www.etcurr.com Biodiesel Performance Evaluation – page

1

Biodiesel Performance Assessment

Name: Date:

Unit: Biodiesel

Terminal Objective 2: produce biodiesel

Performance Objective 2: Given unused cooking oil, necessary equipment and chemicals,

produce biodiesel that is free of soap, dry, and ready for testing.

Process Evaluation

Elements Acceptable Unacceptable

1. Followed safety practices □ □

2. Kept work area clean and neat □ □

Product Evaluation

Elements Acceptable Unacceptable

3. Soap Test □ □

4. Clarity Test □ □

5. 3/27 Test □ □

Note: All items must receive an acceptable rating to pass the objective.

Evaluator: Date:


Curriculum Team ©2008—www.etcurr.com Activity Sheet 2.1 – page 1

Activity Sheet 2.1 – Making biodiesel

Name: Date:

2.1 Directions: Answer the following questions on safety.

1. What safety equipment is used to help keep chemicals out of the eyes?

2. What should be done before leaving the lab to avoid the spread of chemical residues?

3. Why is it important to never taste or touch chemicals?

4. What can be done to avoid inhaling chemical vapor or fumes?

5. To ensure predictable results and maintain a safe environment, what is a good rule to

follow?

6. What can be done to avoid contamination of chemical stores?

7. If unsure of how to dispose of a chemical, what should be done?

2.2 Directions: Locate the MSDS notebook in the laboratory and answer the following

questions.

1. What should be done if potassium hydroxide enters the eyes?

2. What method should be used to extinguish a fire involving biodiesel?

3. What should not be used to absorb spilled methanol?

4. How should glycerin be stored?



2.3 Directions: Match the pictures below with the name from the list by writing the

corresponding letter in the space provided.

A. hotplate

B. funnel

C. thermometer

D. rocker

E. drying pan

F. glass Bottle

G. separating funnel

H. filter paper

I. scale

J. metal pan

K. graduated cylinder

1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

11.

12.



2.4 Directions: In the lesson, seven steps have been identified to make biodiesel. From the

list of steps below, match the step with its description by writing the corresponding letter in

the space provided.

A. Mix catalyst with MeOH

B. Heat cooking oil

C. Mix oil and catalyst/MeOH

D. Separate biodiesel and glycerin

E. Wash biodiesel

F. Dry biodiesel

G. Filter biodiesel

1. The step in which the chemical reaction occurs.

2. The step to remove any particles in the fuel.

3. The step where glycerin is drained off.

4. The step in which potassium hydroxide and methanol are mixed.

5. The step where cooking oil is heated to speed up the reaction time.

6. The step for removing the water from the biodiesel.

7. The step where soaps are removed.

2.5 Directions: Answer the questions below in the space provided.

1. Why is the cooking oil heated to 138 °F and not higher in step 2 – Heat cooking oil?

2. What is the difference between a polar molecule and a non-polar molecule?

3. In your own words, what is a specific gravity of a liquid?

4. Draw a simple diagram to illustrate emulsification, or why oil particles (non-polar) might

be suspended in water (polar). Include a brief description.


Curriculum Team ©2008—www.etcurr.com Safety Information Sheet – page

1

Safety Information Sheet for Making Biodiesel

• Wear splash proof goggles and appropriate gloves — Chemicals can splash into

the eyes or chemical residue on the hands can be transferred into the eyes if proper

precautions are not taken. Also, some chemicals can burn the skin if they come in

contact with bare skin. Wear gloves that can withstand the corrosion of chemicals. If

gloves rip, remove them, wash and dry your hands thoroughly, and get a new pair of

gloves.

• Always wash your hands before leaving the lab — Chemical residues can remain

on the skin. These residues can be transferred to other parts of your body and other

objects that others, who may be more sensitive to various chemicals, may come in

contact.

• Never taste or touch chemicals — Many chemicals are dangerous, even fatal. Even

some chemicals that are not dangerous themselves may have been contaminated.

Many chemicals can be absorbed through the skin or damage the skin and are,

therefore, dangerous to touch.

• Avoid inhaling fumes — The gases that chemical reactions produce can be

dangerous or fatal. Always work in a well ventilated area or in some applications, in

a fume hood.

• Always follow directions and never perform an unauthorized experiment —

Haphazardly combining chemicals can be dangerous or fatal. Do not do anything

with chemicals without authorization and instruction from the teacher.

• Never return unused chemicals to their container — This prevents contamination.

Secondary containers may have been previously used for another purpose and might

have a residue from that purpose. If that residue returns to the original container it

could adversely react and spoil the contents of the original container. All unused

chemicals that have been taken from their original container should be properly

disposed.

• Dispose of chemicals properly — Improper disposal of chemicals is illegal and

dangerous. If not properly disposed of, chemicals can have a detrimental affect on

health and/or the environment.

• NOTE: See Material Safety Data Sheets (MSDS) for specifics concerning

swallowing, inhalation, contact, and disposal. An MSDS should be kept for each

chemical in the laboratory.


Curriculum Team ©2008—www.etcurr.com Safety Quiz for Making Biodiesel – page

1

Safety quiz for making biodiesel

Name: Date:

Directions: If the item is true, circle the letter T. Otherwise, circle the letter F for false.

T F 1. Splash-proof goggles should be worn to keep chemicals out of the eyes.

T F 2. Hands should always be washed before leaving the laboratory.

T F 3. It is O.K. to taste or touch known chemicals.

T F 4. Always work in a well ventilated area.

T F 5. It is O.K. to experiment with chemicals in the lab without consulting

the teacher as long as it is kept in the lab.

T F 6. Unused chemicals should be returned to their original containers.

T F 7. If unsure of how to dispose of a chemical, pour it down the drain.


Curriculum Team ©2008—www.etcurr.com Biodiesel Lesson 2 Help Sheet – page

1

Producing Biodiesel from Cooking Oil

Making small quantities of biodiesel will require a little creativity. While the basic process is

the same, the equipment—55 gallon drums, pumps, aerators, and heaters—will vary. Our

primary equipment will be a chemistry separating funnel (250ml), a mixing jar, and

miscellaneous components. The chemicals we will use are methanol and potassium

hydroxide. The quantity for the chemistry will be a ratio of the following formula: for 1 liter

of cooking oil, 220 ml of methanol and 7–10 grams of potassium hydroxide.

NOTE: Keep your work area clean. Wash all glass equipment with soap and brushes and

rinse thoroughly.

Step

1

Mix Catalyst with MeOH — The first step is to

make the catalyst. Weigh 1 gram of potassium

hydroxide flakes and place in the bottom of your

mixing bottle. Measure 25ml of methanol and pour

into the mixing bottle with the potassium hydroxide.

Mix the chemicals by shaking vigorously until the

potassium hydroxide is completely dissolved into the

solution.

Step

2

Heat Oil – Heat 110ml of cooking oil to 138ºF.

NOTE: The boiling point of Methanol is

approximately 148ºF at sea level.

Step

3

Mix Oil and Catalyst/MeOH – Add the heated

cooking oil slowly and carefully to the methanol and

potassium hydroxide solution. Mix the ingredients by

shaking vigorously for 3 to 5 minutes. Pour the

solution into a separating funnel. Allow time for the

reaction and separation of the solution. It is advisable

to allow the solution to set overnight.

Step

4

Separate Biodiesel and Glycerin – Separate the glycerin from the biodiesel

by draining it out of the bottom of the separating funnel. Set the glycerin aside

in a common container for later use in making soap. There will be two distinct

and separate layers after the reaction and separation is complete. The solution

on the bottom will be glycerin with any methanol not used in the reaction. The

solution on top will be biodiesel with soaps that will need to be removed.


Curriculum Team ©2008—www.etcurr.com Biodiesel Lesson 2 Help Sheet – page

2

Step

5

Wash Biodiesel – It is now time to wash the biodiesel to remove soaps.

Gently pour 30ml to 40ml of warm water into the separating funnel. With the

separating funnel held on its side, gently rock the funnel back and forth

allowing the water to mix with the biodiesel. WARNING: Too rigorous of a

washing motion will create an emulsion (mayonnaise-like material) that will

take days or weeks to break down and dissolve—not good. The soaps in the

biodiesel will defuse into the water turning it milky white. Continue the

washing motion for 3 to 5 minutes. After washing, let the solution set in the

separating funnel for 5 to 30 minutes and then drain off the water solution.

Repeat the process for 4 to 6 washings or until the water separating out is clear.

With each washing, the rigor of the wash can slowly increase. If time and

sharing of equipment allows, let your last wash and drain sit overnight for any

additional separation.

Step

6

Dry Biodiesel – After washing the biodiesel, it

is necessary to dry it removing any water that is

now in solution. We will evaporate the moisture

from the biodiesel. Agitation, heat, and air

movement all assist and accelerate the process.

Due to the small quantity of biodiesel we are

making, traditional methods with heaters, pumps

and/or aerators are problematic.

We will simply agitate our solution in a shallow pan using a rocker platform.

The biodiesel will become clear after the water is removed. A simple test is to

place newsprint on the back side of a bottle of biodiesel. If you can read the

print, the biodiesel is clear and free of water. Another test is to collect a small

sample of biodiesel from your batch and heat it to 212ºF, the temperature of

boiling water, and observe if any bubbles form. If no bubbles form at 212ºF,

the solution is free of water. Discard this sample, and conclude your batch is

dry of water.

Step

7

Filter Biodiesel – For our application, we will

filter the biodiesel to ensure clean operation in

our diesel engine. Filter paper, 125mm in

diameter, should be folded to form a cone with no

opening in the bottom similar in shape to the

glass funnel supplied. After placing the filter

paper inside the funnel, pour your biodiesel

slowly into the funnel so it must pass through the

filter paper. Avoid pouring the biodiesel in the

funnel so the fuel passes above and around the

filter paper. This set up can be used by several groups to save time and filter

paper.

biodiesel unit terminal objective 2: performance · pdf file · 2012-03-094....

Documents