Education Journalist | Study Abroad Lead
Dichloromethane is a geminal chemical compound, commonly known as Methylene chloride or Methylene dichloride. Poly Halogens are a kind of compound which are made out of Halogen group elements. However, the existence of two or more halogen groups created as substituents in the organic compounds distinguishes these substances. Aside from being extremely reactive, halogen compounds may also be poisonous and carcinogenic. It is a polyhalogen chemical that is employed in a variety of industries and has various effects on the environment and it is also termed methylene dichloride or (more commonly) methylene chloride.
| Table of Content |
Key Takeaways: Methylene, Chloride, Chemical, Compound, Liquid, Halogen, Organic compounds, Poly halogens, Methylene chloride, Halogen groups
What is Dichloromethane?
[Click Here for Sample Questions]
Natural sources include marine sources, macroalgae, volcanoes, and wetlands. Methylene dichloride is mostly found in the environment as a result of industrial emissions. Dichloromethane has the chemical formula CH2Cl2 Methylene chloride is a colourless liquid with an ether-like sweet, penetrating odour. It's a chlorinated hydrocarbon in the form of a volatile liquid. It is non-combustible, although it may create hazardous chloride vapours when subjected to high temperatures.
Read More:-
| Chapter Related Concepts | ||
|---|---|---|
| Ester Hydrolysis | Fehling Test | Iodoform Test |
| Hell-Volhard-Zelinsky Reaction | Friedel-Crafts acylation reaction | Butyric Acid |
Uses of Dichloromethane
[Click Here for Sample Questions]
Following are the uses of Dichloromethane:
- It's used in the food sector to decaffeinate coffee and tea, as well as to make hop extracts and other flavourings. It is utilised as an aerosol spray propellant and a blowing agent for polyurethane foams due to its high volatility.
- It's used to keep electric metres' casings sealed. It is frequently supplied as a component of plastic welding adhesives, but it is also widely used by model builders to attach plastic components together. "Di-clo" is a frequent nickname for it.
- It's used to remove heat-sealed garment transfers in the garment printing business.
- It's also the fluid of Christmas bubble lights, which include a colourful bubbling tube above a lamp for heat and a little quantity of rock salt for thermal energy and a nucleation site for the phase-changing solvent.
Properties of Dichloromethane
[Click Here for Sample Questions]
Following are the Properties of Dichloromethane:
Physical Properties of Dichloromethane
Following are the Physical Properties of Dichloromethane:
- It is a colourless liquid which has an ether-like odour.
- Even though it has no specified flashpoint, it does form flammable vapour-air mixtures.
- It is fairly stable in the absence of dampness at room temperature when opposed to its congeners, chloroform and carbon tetrachloride.
- It is polar and miscible with many organic solvents however it is not miscible with water.
Chemical Properties of Dichloromethane
Following are the Chemical Properties of Dichloromethane:
- Its Melting Point is −96.7°C.
- Its Boiling Point is 39.6°C.
- It decomposes at 720°C.
- Its Molecular Weight is 84.93 g/mol.
Impact of Dichloromethane on the Environment
[Click Here for Sample Questions]
- Dichloromethane, a neurotoxin, has been shown to cause harm to the brain and central nervous system (CNS). High levels of exposure to the chemical have been shown to cause liver and lung cancer in animals.
- Dichloromethane has such a limited lifespan in the atmosphere that it decomposes before it reaches the ozone layer. Difficulty concentrating, dizziness, exhaustion, nausea, headaches, stiffness, fatigue, and inflammation of the upper respiratory tract and eyes are all symptoms of acute dichloromethane inhalation exposure.
- Dichloromethane-containing items are subject to warnings in several countries. Methylene chloride has been prohibited in several countries. Methylene dichloride is still used in India's industries.
Why Is Dichloromethane Dangerous?
[Click Here for Sample Questions]
Despite being the least poisonous of the basic chlorohydrocarbons, DCM poses significant health hazards. which makes it dangerous to any living body.
- Shortness of breath and wheezing might occur if you inhale the chemical. It might also make you feel nauseated and dizzy if you inhale a huge amount of it.
- If it gets into touch with your skin, it can cause your skin to become red and irritated. On the other hand, if it comes into touch with your skin for an extended period of time, it may cause it to burn.
- If you have dichloromethane on your hands, do not touch your eyes; this might cause lasting damage to your eyes. A chemical burn in your eyes can be caused by even a small amount of this liquid molecule.
What to do if you were Exposed to dichloromethane?
[Click Here for Sample Questions]
The following are the safety precautions to take if you or someone else is exposed to dichloromethane:
- Eye Contact: For at least 30 minutes, flush your eyes with a significant volume of water. Remove contact lenses if necessary before flushing. Seek medical assistance.
- Contact with the skin: Remove contaminated garments as soon as possible and thoroughly wash the skin with soap and water. If any irritation occurs, seek medical help.
- Inhalation: Individuals should be evacuated from the exposure area and transported to fresh air space as quickly as possible. If you have trouble breathing, seek medical help right once.
Things to Remember
Following are some important points:
- DCM was discovered in 1839 by the French scientist Henri Victor Regnault (1810–1878).
- When the skin comes into contact with liquid dichloromethane, it can cause redness and irritation.
- Individuals should be evacuated from the exposure area and quickly relocated to a fresh air place.
- If you are having trouble breathing, seek medical care straight away.
- Exposure to DCM can induce irregular cardiac rhythms and/or heart attacks in persons who already have heart issues, sometimes without any other indications of overexposure.
Read More:-
Sample Questions
Ques: What are the uses of dichloromethane? (2 Marks)
Ans: Some uses of DCM are:
- As an active element in paint strippers made from organic materials
- In the production of pharmaceuticals and other medications
- decaffeinated coffee beans and tea leaves production processes
- In the food and beverage sectors, to make flavourings
Ques: What are the risks of dichloromethane on one's health? (2 Marks)
Ans: It has been shown to induce brain damage as well as central nervous system harm. The Environmental Protection Agency (EPA) has also classed this chemical as a possible human carcinogen. Lung cancer, Coughing, wheezing, and/or shortness of breath may result. Inhaling higher quantities of dichloromethane might cause headaches, mental disorientation, nausea, vomiting, dizziness, and exhaustion.
Ques: What are some major chemical properties of dichloromethane? (2 Marks)
Ans: Some major chemical properties of dichloromethane are as follows:
| Molecular Weight of Dichloromethane | 84.93 g/mol |
|---|---|
| Density of Dichloromethane | 1.3266 g/cm3 |
| Melting Point of Dichloromethane | −96.7 °C |
| Boiling Point of Dichloromethane | 39.6 °C |
Ques: What are the physical properties of dichloromethane? (2 Marks)
Ans: It is a colourless liquid with an ether-like odour. It can break down when it comes into touch with hot surfaces or an open flame, releasing poisonous gases that are annoying and sending out a warning signal. It emits very poisonous phosgene and hydrogen chloride fumes when heated to breakdown.
Ques: What are the safety precautions one should follow while using dichloromethane? (2 Marks)
Ans: Use the following safety measures while working with dichloromethane:
- Put on protective clothes. Footwear should completely cover the foot.
- Always wear personal protective equipment (PPE) such as chemical splash goggles and safety gloves.
- Always work in a very well-ventilated area which is preferably in an environment with a fume extraction system.
Ques: How should dichloromethane be stored? (2 Marks)
Ans: Dichloromethane is very flammable and should be stored in firmly closed, labelled containers in a cold, dry place. Keep this chemical away from metals, light, and any source of heat or ignition. To minimise inadvertent accidents, large containers of this chemical should be stored on low, enclosed shelves.
Ques. What should be done if there is a spill or leakage of dichloromethane chemical? (3 Marks)
Ans. Several measures must be taken in the case of a dichloromethane chemical spill or leak:
- Personnel should be escorted out of the zone.
- Control and secure the area's entry.
- Stop or decrease the spill/leak if it is safe to do so.
- Place liquids in sealed containers after absorbing them in a medium such as dry sandy soil or a similar material.
- Ventilate the spilled or leaking location.
- Do not throw it in the sink or sewer.
Ques: How is dichloromethane produced? (3 Marks)
Ans: Henri Victor Regnault, a French chemist, created DCM for the first time in 1839. It is created by heating chloromethane or methane to 400–500 °C and treating it with chlorine gas. Both methane and chloromethane undergo a sequence of reactions at these temperatures, creating progressively more chlorinated compounds.
These methods produce a combination of chloromethane, dichloromethane, chloroform, carbon tetrachloride, and hydrogen chloride as by-products. Distillation is used to separate these chemicals.
Ques: How harmful is dichloromethane when inhaled? (2 Marks)
Ans: The most common method of exposure is inhalation because methylene chloride vapour is easily absorbed by the lungs. At high doses, olfactory exhaustion might occur. Methylene chloride is heavier than air, and in confined, poorly ventilated, or low-lying places, it can induce asphyxiation. Because they have bigger lung surface area children exposed to the same quantities of methylene chloride vapour as adults may get higher dosages. Furthermore, due to their low stature, kids may be exposed to higher levels than adults in the same region.
For Latest Updates on Upcoming Board Exams, Click Here: https://t.me/class_10_12_board_updates
Check-Out:
Comments