Methylene chloride = dichloromethane liquid

Methylene chloride (dichloromethane, methylene dichloride) n. CH2-CI2. A low-boiling chlorinated hydrocarbon which is a colorless, fairly dense, non-flammable liquid used as a solvent for cellulose triacetate and vinyl resins, a solvent in the polymerization of polycarbonate resins, and as a reactant for certain phenolic resins. It was widely used as a paint stripper and solvent for cured epoxy resins, but is less used now in the effort to keep chlorinated solvents... 

Following the 20 minute reaction period, pour 10 mL of methylene chloride (dichloromethane) into the reaction mixture in small portions in such a way as to rinse the solids adhering to the wall of the 50-mL Erlenmeyer flask. Swirl the flask gently, and let the solids settle. Using a Pasteur pipette, transfer the liquid into the Hirsch funnel. Most of the solid will remain in the flask, but any solid that is transferred with the pipette will be retained by the filter aid and silica gel. Rinse the flask with about 10 mL of methylene chloride and using the Pasteur pipette, transfer the liquid to the funnel. Normally, the filtrate in the filter flask will not contain any solid material. However, if there is solid present, you will need to decant the solution away from the solid into another container. 

A liquid not considered flammable may still have an explosive potential. An example is dichloromethane or methylene chloride, often used in paint strippers, which evaporates very quickly. It is not flammable, but its vapors may be explosive (explosive limits 12% to 22%). 

The addition of co-solvents to ionic liquids can result in dramatic reductions in the viscosity without alteration of the cations or anions in the system. The haloaluminate ionic liquids present a challenge, due to the reactivity of the ionic liquid. Nonetheless, several compatible co-solvents including benzene, dichloromethane, and acetonitrile have been investigated [33-37]. The addition of as little as 5 wt. % acetonitrile or 15 wt. % benzene or methylene chloride was able to reduce the... 

B. General Oxidation Procedure for Alcohols. A sufficient quantity of a 5% solution of dipyridine chromium (VI) oxide (Note 1) in anhydrous dichloromethane (Note 7) is prepared to provide a sixfold molar ratio of complex to alcohol. This excess is usually required for complete oxidation to the aldehyde. The freshly prepared, pure complex dissolves completely in dichloromethane at 25° at 5% concentration to give a deep red solution, but solutions usually contain small amounts of brown, insoluble material when prepared from crude complex (Note 8). The alcohol, either pure or as a solution in anhydrous methylene chloride, is added to the red solution in one portion with stirring at room temperature or lower. The oxidation of unhindered primary (and secondary) alcohols proceeds to completion within 5 minutes to 15 minutes at 25° with deposition of brownish-black, polymeric, reduced chromium-pyridine products (Note 9). When deposition of reduced chromium compounds is complete (monitoring the reaction by gas chromatography or thin-layer chromatography analysis is helpful), the supernatant liquid is decanted from the (usually tarry) precipitate and the precipitate is rinsed thoroughly with dichloromethane (Note 10). 

Fig. 7. Comparison of experimental phase boundary concentrations between the isotropic and biphasic regions for various liquid-crystalline polymer solutions with the scaled particle theory for wormlike hard spherocylinders. ( ) schizophyllan water [65] (A) poly y-benzyl L-glutamate) (PBLG)-dimethylformamide (DMF) [66-69] (A) PBLG-m-cresoI [70] ( ) PBLG-dioxane [71] (O) PBLG-methylene chloride [71] (o) po y(n-hexyl isocyanate) (PHICH°Iuene at 10,25,30,40 °C [64] (O) PHIC-dichloromethane (DCM) at 20 °C [64] (5) a po y(yne)-platinum polymer (PYPt)-tuchIoroethane (TCE) [33] ( ) (hydroxypropyl)-cellulose (HPC)-water [34] ( ) HPC-dimethylacetamide (DMAc) [34] (N) (acetoxypropyl) cellulose (APC)-dibutylphthalate (DBP) [35] ( ) cellulose triacetate (CTA)-trifluoroacetic acid [72]...

In 1982, /Mert-butyl-cal i x n larenes were studied by Izatt et al. for their capacity to transport cesium from an alkaline medium ([MOH] = 1M) through bulk liquid membranes made of a mixture of diluents able to dissolve these compounds methylene chloride, carbon tetrachloride, and dichloromethane. Experiments were carried out using p-tert-calix[8]arene to measure the rate of cesium transport under conditions of varying source pH. The values of the transport rate, small below a pH of 12, rise rapidly beyond this value, hence confirming that a proton is removed from the ligand in the complexation process. Under such conditions, tetramer, hexamer, and octamer (n = 4, 6, and 8, respectively) display a high selectivity for cesium over the other... 

The first liquid-solid separation of the corticosteroids was carried out using a silica stationary phase with a mobile phase of chloroform-dioxane (100 5) to separate cortisol, cortisone and 11-de-oxycortisol (Touchstone and Wortmann, 1973). Most separations using silica stationary phases have used variations of the mobile phase originally described by Hesse and Hovermann (1973). Thus, a mobile phase of dichloromethane-ethanol-water (93.6 4.7 1.7) has been used to resolve prednisolone, cortisol, prednisone, cortisone, corticosterone, deoxycortisol and 17-a-hydroxy-progesterone on a silica stationary phase (Trefz et al., 1975). Other mobile phases which have been used include hexane-methylene chloride-ethanol-acetic acid (63.8 30 6 0.2) for the determination of plasma prednisolone (Loo et al., 1977), a mixture of 1.5% methanol and 0.2% water in chloro-... 

The addition of cosolvents to ionic liquids can result in dramatic reductions in the viscosity without changing the cations or anions in the system. The haloalu-minate ionic liquids present a challenge due to the reactivity of the ionic liquid. Nonetheless, several compatible co-solvents have been investigated, including benzene, dichloromethane, and acetonitrile [13-17]. The addition of as little as 5 wt.% acetonitrile or 15 wt.% of benzene or methylene chloride was able to reduce the absolute viscosity by 50% for [EMIMjCl-AlCls ionic liquids with less than 50 mol% AICI3 [13]. Non-haloaluminate ionic liquids have also been studied with a range of co-solvents including water, acetone, ethanol, methanol, butanone, ethyl acetate, toluene, and acetonitrile [6,18-22]. The ionic liquid response is similar to that observed in the haloaluminate ionic liquids. The addition of as little as 20 mol% co-solvent reduced the viscosity of a [BMIM][BF4] melt by 50% [6]. 

Dichloromethane [75-09-2] (methylene chloride) is a colorless, highly volatile, neutral liquid with a characteristic odor. It is insoluble in water but miscible with organic solvents. It has a very good solvency for many organic substances, such as fats, oils, waxes, and resins. Bitumen, rubber, chlorinated rubber, polystyrene, postchlorinated poly(vinyl chloride), vinyl chloride copolymers, polyacrylates, and cellulose esters are also soluble. The solubility spectrum can be expanded by adding other solvents. A mixture of methanol or ethanol and dichloromethane is a good solvent for cellulose ethers and acetyl cellulose. Cellulose nitrate is, however, insoluble. 

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