Preparation of the maximum pure 40% methylamine solution from methylamine hydrochloride can be carried out as follows:
Materials:
- Methylamine hydrochloride (about 160 g)
- Distilled water (about 240 ml)
- Glass flask with a volume of about 500 ml
- Magnetic stirrer
- Thermometer
- Unloading crane
- Glass pipette
Steps:
1. Prepare 240 ml of distilled water in a glass flask with a volume of about 500 ml.
2. Put methylamine hydrochloride in a flask of water.
3. Place the flask on the magnetic stirrer and start stirring.
4. Preheat the mixture to a temperature of 50-60°C, using a thermometer to control the temperature.
5. Continue heating and stirring until the methylamine hydrochloride is completely dissolved.
6. Bring the volume of the solution to 400 ml, adding distilled water, if necessary.
7. Cool the mixture to room temperature while continuing to stir.
8. Adjust the pH to a value of 10-11 using a 10% NaOH solution.
9. Check the concentration of methylamine in the solution using test strips or another method, and, if necessary, adjust the concentration by adding either water or methylamine hydrochloride.
10. Leave the mixture for a few hours or overnight so that all impurities settle to the bottom of the flask.
11. Filter the solution through a filter to remove any remaining impurities.
12. Ready-made methylamine 40% solution can be used in appropriate applications.
Please note that when using any chemicals, appropriate safety measures must be observed, including but not limited to: work in a well-ventilated area, use protective clothing and gloves.
Materials:
- Methylamine hydrochloride (about 160 g)
- Distilled water (about 240 ml)
- Glass flask with a volume of about 500 ml
- Magnetic stirrer
- Thermometer
- Unloading crane
- Glass pipette
Steps:
1. Prepare 240 ml of distilled water in a glass flask with a volume of about 500 ml.
2. Put methylamine hydrochloride in a flask of water.
3. Place the flask on the magnetic stirrer and start stirring.
4. Preheat the mixture to a temperature of 50-60°C, using a thermometer to control the temperature.
5. Continue heating and stirring until the methylamine hydrochloride is completely dissolved.
6. Bring the volume of the solution to 400 ml, adding distilled water, if necessary.
7. Cool the mixture to room temperature while continuing to stir.
8. Adjust the pH to a value of 10-11 using a 10% NaOH solution.
9. Check the concentration of methylamine in the solution using test strips or another method, and, if necessary, adjust the concentration by adding either water or methylamine hydrochloride.
10. Leave the mixture for a few hours or overnight so that all impurities settle to the bottom of the flask.
11. Filter the solution through a filter to remove any remaining impurities.
12. Ready-made methylamine 40% solution can be used in appropriate applications.
Please note that when using any chemicals, appropriate safety measures must be observed, including but not limited to: work in a well-ventilated area, use protective clothing and gloves.
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- By G.Patton
From 160g of methylamine hydrochloride you'll get 73.6g of methylamine free base, dissolved in 400 ml water. It will be 18.4% methylamine aq solution. Not 40%.
In addition, you'll get 138.5g of NaCl in this solution, which will not be dissolved completely because of over saturation of water. NaCl solubility is 360 g/L (25°C).
It's important to say that MeNH2 very volatile and evaporates quite easy. So that, It's necessary to close the flask tightly. The best option is using methylamine solution directly after preparation.
Here, I posted BB Forum team methods of methylamine water and methanol solution preparations from methylamine hydrochloride.
In addition, you'll get 138.5g of NaCl in this solution, which will not be dissolved completely because of over saturation of water. NaCl solubility is 360 g/L (25°C).
It's important to say that MeNH2 very volatile and evaporates quite easy. So that, It's necessary to close the flask tightly. The best option is using methylamine solution directly after preparation.
Here, I posted BB Forum team methods of methylamine water and methanol solution preparations from methylamine hydrochloride.
