Methylene Chloride

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methylene chloride

[′meth·ə‚lēn ′klȯr‚īd]
(organic chemistry)
CH2Cl2 A colorless liquid, practically nonflammable and nonexplosive; used as a refrigerant in centrifugal compressors, a solvent for organic materials, and a component in nonflammable paint-remover mixtures.

Methylene Chloride

 

CH2C12; a colorless liquid with an odor similar to that of chloroform. Boiling point, 40°C ; density, 1.3255 g/cm3 at 20°C . It is miscible with organic solvents; its solubility in water is 1.32 g per 100 g at 25°C . Methylene chloride reacts with water to form an azeotrope (boiling point, 38. TC; 98.5 percent CH2C12).

Methylene chloride is prepared commercially by chlorination of methane, which also produces methyl chloride and chloroform. It is used as a solvent for plastics, rubber, cellulose esters, and fats, as well as in the extraction of essential oils. Methylene chloride has a mild narcotic effect.

References in periodicals archive ?
Prakash, Isolation of stigmasterol and [beta]-sitosterol from the dichloromethane extract of Rubus suavissimus, Int.
Key Benefits for Worldwide Dichloromethane Market Report:
ligulata dichloromethane extract had the most efficient scavenging activity, with an [IC.sub.50] of 3.01 [+ or -] 0.12 mg [mL.sup.-1], followed by the L.
The composition analysis of the hydrocarbon (dichloromethane soluble part) presents the sludge samples from the suction strainer (XRPD-B) and water recycle pump (XRPD-C) obtained from FTIR, DSC, and TGA indicated that the (a) sample is mostly organic and its phenolic-based material, (b) glass transition temperature (Tg) of the sheet sample material was 102[degrees]C (I), (c) total weight loss of volatiles (organic-based volatiles/light components) and organic-based materials were determined to be about 76 wt%, and (d) the remaining residual mass of the sample (inorganic) was found to be around 24wt%.
Table 1 shows the distribution ratios of the [M(en).sub.2] and [M(en).sub.3] species in the aqueous phase before extraction and the extraction percentage for extraction with [H.sub.8]L into dichloromethane. The distribution ratios for the complexations with [H.sub.8]L are comparable and indicative of high efficiency (Table 1).
Caption: FIGURE 5: The total ion current chromatograms of morpholine resulting from different methods: direct detection of 400 [micro]g x [L.sup.-1] (A) and 20 mg x [L.sup.-1] (B) morpholine prepared in dichloromethane and detection of 400 [micro]g x [L.sup.-1] morpholine prepared in pure water after the proposed derivatization (C).
(ii) PLE: PM subsamples were extracted using an ASE350 (Dionex Corporation) and dichloromethane (DCM) as extraction solvent (100[degrees]C, 10.34 psi and 1 static cycle).
The standard TLC analysis of curcumin using a normal TLC plate with a mobile phase of 97% dichloromethane, 3% methanol works well (12).
Polyaniline composite was synthesized by the above procedure except that Fe[(DS).sub.3] (4.3 g, 0.05 M) was dissolved in 50 mL of dichloromethane instead of water.
Specifically, the selected extracts were solubilized separately in methanol:water (hydro-methanol fraction; 1:3 [v/v] for the leaf and branch extracts and 8:2 [v/v] for the seed extracts) and partitioned in a separatory funnel, using hexane for the seed extract and organic solvents of increasing polarity (hexane, dichloromethane, and ethyl acetate) for the leaf and branch extracts.