How does dichloromethane remove water?
In this example, water is removed from dichloromethane by refluxing dichloromethane in the presence of calcium hydride at 60°C. Under these conditions, calcium hydride reacts with water to form calcium hydroxide and hydrogen gas.
What is molecular sieve filtration?
Molecular sieves are in the family of desiccants, also known as adsorbents, used for hydrocarbon drying, described as the removal of dissolved water from hydrocarbon gases and liquids. High-efficiency filtration and separation is key to achieving this reliability and targeted desiccant bed campaign length.
What is molecular sieve chemistry?
A molecular sieve is a material with pores (very small holes) of uniform size. These pore diameters are similar in size to small molecules, and thus large molecules cannot enter or be adsorbed, while smaller molecules can. The pore diameter of a molecular sieve is measured in ångströms (Å) or nanometres (nm).
What is dichloromethane found in?
What products contain methylene chloride? Paint Strippers: Methylene chloride is a key ingredient in a variety of paint strippers sold in the U.S. Other Products: Other products containing DCM are used for automotive care, lubrication, lithography, and general cleaning.
What is dichloromethane made of?
Dichloromethane is commonly produced by chlorinating methane. The process also produces the other three C1 chlorohydrocarbons—chloromethane, trichloromethane (chloroform), and tetrachloromethane (carbon tetrachloride). The four are separated via distillation.
Is DCM drinkable?
Dichloromethane is of low acute toxicity. An inhalation study in mice provided conclusive evidence of carcinogenicity, whereas a drinking-water study provided only suggestive evidence.
Is DCM polar or nonpolar?
Dichloromethane is polar because it has different polarity bonds and its shape cannot arrange those bond dipoles to cancel out. Note that polarity can be considered for the whole molecule, functional group or particular bonds. E.g. CO2 has zero permanent dipole moment, as bond dipoles cancel each other.
What is molecular sieve 13X?
BASF 13X Molecular Sieve is a highly selective adsorbent designed for the elimination of trace contaminants from air and other gases. It can also be used for the desulphurization (sweetening) of natural gas and other fluids, especially for the removal of mercaptanes, and for drying of gases and liquids.
What is zeolite molecular sieve?
Molecular sieves (zeolites) are artificially prepared alkali metal aluminosilicates. For gas–solid chromatography, the most common types are calcium aluminosilicate (type 5A) with an effective pore diameter of 0.5 nm and sodium aluminosilicate (type 13X) with an effective pore diameter of 1 nm.
How does mol sieve work?
A molecular sieve works by adsorbing gas or liquid molecules that are smaller than the effective diameter of its pores, while excluding those molecules that are larger than the openings. The size of the pores of both Type A and Type X molecular sieves is closely controlled during the manufacturing process.
What are molecular sieves used for in chromatography?
Some molecular sieves are used in size-exclusion chromatography, a separation technique that sorts molecules based on their size. Other molecular sieves are used as desiccants (some examples include activated charcoal and silica gel). The diameter of a molecular sieve is measured in ångströms (Å) or nanometres (nm).
What is dichloromethane used for in chemistry?
Dichloromethane, otherwise known as methylene chloride, is a common solvent in paint remover and is used for liquid–liquid extraction in laboratories.
How can I prepare anhydrous dichloromethane?
For preparing the anhydrous Dichloromethane, you can use the molecular sieve 3A.. You can find the reference publish in ACS website D. Bradley et. al. J. Org. Chem., 2010, 75 (24), pp 8351–8354. It is an easy way to dry the solvent rather you use Calcium Hydride or sodium metal.
What is the half life of dichloromethane in water?
Dichloromethane released to water can be evaporated to atmosphere with a half-life of 35.6 h at moderate mixing conditions. Dichloromethane (DCM) or methylene chloride is a volatile, colorless liquid with a chloroform-like odor.