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Dichloromethane 1L - Dichloromethane 1L - Dichloromethane 1lt

Dichloromethane 1L - Dichloromethane 1L - Dichloromethane 1lt
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Home Κατάστημα Laboratory Equipment Chemical Reagents Organic Compounds Dichloromethane 1lt
Dichloromethane 1L - Dichloromethane 1L - Dichloromethane 1lt
Chromium (III) Sulfate 250gr €18,55 €23,00 με ΦΠΑ
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Dichloromethane 1L - Dichloromethane 1L - Dichloromethane 1lt
Dimethylsulfoxide (DMSO) 99,5% 1lt €64,52 €80,00 με ΦΠΑ

Dichloromethane 1lt

€26,61 €33,00 με ΦΠΑ

Dichloromethane 1L

Methylene chloride; Methylene dichloride; Solmethine; Narkotil; Solaesthin; Di-clo; Refrigerant-30; Freon-30; R-30; DCM; MDC
CH2Cl2
M.W: 84.93 g·mol−1
Cas Number: 75-09-2
https://pubchem.ncbi.nlm.nih.gov/compound/Dichloromethane

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SKU: 330117 Categories: Organic Compounds, Organic Compounds Tag: Solvents
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  • Description
Description

Dichloromethane 1lt

Dichloromethane (DCM or methylene chloride, methylene bichloride) is an organochlorine compound with the formula CH2Cl2. This colorless, volatile liquid with a chloroform-like, sweet odour is widely used as a solvent. Although it is not miscible with water, it is polar, and miscible with many organic solvents.

Occurrence

Natural sources of dichloromethane include oceanic sources, macroalgae, wetlands, and volcanoes. However, the majority of dichloromethane in the environment is the result of industrial emissions. 

Production

DCM is produced by treating either chloromethane or methane with chlorine gas at 400–500 °C. At these temperatures, both methane and chloromethane undergo a series of reactions producing progressively more chlorinated products. In this way, an estimated 400,000 tons were produced in the US, Europe, and Japan in 1993. 

CH4 + Cl2 → CH3Cl + HCl
CH3Cl + Cl2 → CH2Cl2 + HCl
CH2Cl2 + Cl2 → CHCl3 + HCl
CHCl3 + Cl2 → CCl4 + HCl

The output of these processes is a mixture of chloromethane, dichloromethane, chloroform, and carbon tetrachloride as well as hydrogen chloride as a byproduct. These compounds are separated by distillation.

DCM was first prepared in 1839 by the French chemist Henri Victor Regnault (1810–1878), who isolated it from a mixture of chloromethane and chlorine that had been exposed to sunlight. 

DCM’s volatility and ability to dissolve a wide range of organic compounds makes it a useful solvent for many chemical processes. In the food industry, it is used to decaffeinate coffee and tea as well as to prepare extracts of hops and other flavourings. Its volatility has led to its use as an aerosol spray propellant and as a blowing agent for polyurethane foams.

Toxicity

Even though DCM is the least toxic of the simple chlorohydrocarbons, it has serious health risks. Its high volatility makes it an acute inhalation hazard. It can also be absorbed through the skin. Symptoms of acute overexposure to dichloromethane via inhalation include difficulty concentrating, dizziness, fatigue, nausea, headaches, numbness, weakness, and irritation of the upper respiratory tract and eyes. More severe consequences can include suffocation, loss of consciousness, coma, and death.

DCM is also metabolized by the body to carbon monoxide potentially leading to carbon monoxide poisoning. Acute exposure by inhalation has resulted in optic neuropathy and hepatitis. Prolonged skin contact can result in DCM dissolving some of the fatty tissues in skin, resulting in skin irritation or chemical burns.

It may be carcinogenic, as it has been linked to cancer of the lungs, liver, and pancreas in laboratory animals. Other animal studies showed breast cancer and salivary gland cancer. Research is not yet clear as to what levels may be carcinogenic. DCM crosses the placenta but fetal toxicity in women who are exposed to it during pregnancy has not been proven. In animal experiments, it was fetotoxic at doses that were maternally toxic but no teratogenic effects were seen.

In people with pre-existing heart problems, exposure to DCM can cause abnormal heart rhythms and/or heart attacks, sometimes without any other symptoms of overexposure. People with existing liver, nervous system, or skin problems may worsen after exposure to methylene chloride.

Uses

DCM’s volatility and ability to dissolve a wide range of organic compounds makes it a useful solvent for many chemical processes. In the food industry, it is used to decaffeinate coffee and tea as well as to prepare extracts of hops and other flavourings. Its volatility has led to its use as an aerosol spray propellant and as a blowing agent for polyurethane foams.

Hydrogen bonding

Methylene chloride is a Lewis acid that can hydrogen bond to electron donors. It is classified as a hard acid and is included in the ECW model. It is a solvent that has been used in many thermodynamic studies of donor-acceptor bonding. The donor hydrogen-bonding corrections of methylene chloride in these thermodynamic studies has been reported.

Specialized uses

Dichloromethane 1L - Dichloromethane 1L - Dichloromethane 1lt

Near IR absorption spectrum of dichloromethane showing complicated overlapping overtones of mid IR absorption features.

The chemical compound’s low boiling point allows the chemical to function in a heat engine that can extract mechanical energy from small temperature differences. An example of a DCM heat engine is the drinking bird. The toy works at room temperature. It is also used as the fluid in jukebox displays and holiday bubble lights that have a colored bubbling tube above a lamp as a source of heat and a small amount of rock salt to provide thermal mass and a nucleation site for the phase changing solvent.

DCM chemically welds certain plastics. For example, it is used to seal the casing of electric meters. Often sold as a main component of plastic welding adhesives, it is also used extensively by model building hobbyists for joining plastic components together. It is commonly referred to as “Di-clo.”

It is used in the garment printing industry for removal of heat-sealed garment transfers.

DCM is used in the material testing field of civil engineering; specifically it is used during the testing of bituminous materials as a solvent to separate the binder from the aggregate of an asphalt or macadam to allow the testing of the materials.

Dichloromethane extract of Asparagopsis taxiformis, a seaweed fodder for cattle, has been found to reduce their methane emissions by 79%.

It has been used as the principal component of paint stripper, but its use for this purpose is now prohibited in the United States and the European Union.

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