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Methylene chloride, physical properties

The physical properties of methylene chloride are Hsted in Table 1 and the binary a2eotropes in Table 2. Methylene chloride is a volatile Hquid. Although methylene chloride is only slightly soluble in water, it is completely miscible with other grades of chlorinated solvents, diethyl ether, and ethyl alcohol. It dissolves in most other common organic solvents. Methylene chloride is also an excellent solvent for many resins, waxes, and fats, and hence is well suited to a wide variety of industrial uses. Methylene chloride alone exhibits no dash or fire point. However, as Htde as 10 vol % acetone or methyl alcohol is capable of producing a dash point. [Pg.518]

Quinoxalin-2-ones are in tautomeric equilibrium with 2-hydroxy-quinoxalines, but physical measurements indicate that both in solution and in the solid state they exist as cyclic amides rather than as hydroxy compounds. Thus quinoxalin-2-one and its A -methyl derivative show practically identical ultraviolet absorption and are bases of similar strength. In contrast, the ultraviolet spectra of quinoxalin-2-one and its 0-methyl derivative (2-methoxyquinoxaIine) are dissimilar. The methoxy compound is also a significantly stronger base (Table II). Similar relationships also exist between the ultraviolet absorption and ionization properties of 3-methylquinoxalin-2-one and its N- and 0-methyl derivatives. The infrared spectrum of 3- (p-methoxy-benzyl)quinoxalin-2-one (77) in methylene chloride shows bands at 3375 and 1565 cm" which are absent in the spectrum of the deuterated... [Pg.229]

Methylene chloride was selected primarily on the basis of the following criteria (1) It is commonly referred to as the universal solvent or the one used most frequently in the extraction of semivolatile organics sorbed on polymeric sorbent media. Hence, the contaminant chemistry associated with this solvent system would be of the most use to resin users. (2) The physical and chemical properties of methylene chloride make it ideally suited for the extraction of semivolatile organics sorbed on polymeric sorbent media. [Pg.249]

The term oil and grease refers to a broad class of organic substances recovered from the sample matrices by extraction with an appropriate solvent. Such recovery, therefore, is characteristic of certain physical properties of the compounds, primarily the volatility of the compounds and their solubility in the extraction solvent. The solvent must be immiscible in water and volatile, as well as readily distilled on a water bath. Many solvents or mixed-solvent systems should be suitable for the extraction of oil and grease in aqueous and nonaqueous samples. These include petroleum ether, w-hexanc, methylene chloride, methyl ter/-butyl ether, and trichlorotrifhroroethan (freon). These solvents are listed in Table 1. [Pg.438]

In order to prepare non-styrenic polymer-supported organotin chlorides, which are expected to show physical properties such as mechanical strength, polarity and porosity different from those of polystyrene-based supports, Deleuze and coworkers copolymerised dibutyl[3-(allyloxy)propyl]tin chloride with N-phenylmaleimide (PMI) and l,l/-(methylene-4,l-phenylene)bismaleimide (MPBMI) to prepare the polymers 88a and 88b180. [Pg.1584]

The physical properties of alkynes (Table 9-2) are similar to those of alkanes and alkenes of similar molecular weights. Alkynes are relatively nonpolar and nearly insoluble in water. They are quite soluble in most organic solvents, including acetone, ether, methylene chloride, chloroform, and alcohols. Many alkynes have characteristic, mildly offensive odors. Ethyne, propyne, and the butynes are gases at room temperature, just... [Pg.394]

Table 7. Preparative conditions of the CT A-acetone solutions for dry-spinning and the physical properties of CTA filaments dry-spun from acetone and methylene chloride solution 54)... [Pg.26]

Terpenes are a class of unsaturated hydrocarbons made up of isoprene C5 units and found in essential oils and oleoresins of plants such as conifers. The two most commonly used as solvents are turpentine and o-limonene. Their physical properties are compared with those of toluene and methylene chloride in Table 5.7. They are both immiscible with water. As can be seen in Figure 5.3, D-limonene and other small terpenes have similar molecular weights and structures to substituted cyclohexanes and toluene and are therefore to likely have solvent properties intermediate between these two VOCs. [Pg.109]

Table 5.7 Some physical properties of D-limonene and turpentine alongside methylene chloride and toluene for comparison. Table 5.7 Some physical properties of D-limonene and turpentine alongside methylene chloride and toluene for comparison.
Chemical and Physical Properties Trichlorfon is an organophosphate compound, which has an empirical formula of C4HgCl304P and a molecular weight of 257.44. It is a racemic mixture of two isomers. Trichlorfon is a pale clear, white or yellow crystalline powder, melting point 75-84°C, boiling point 100°C, vapor pressure 7.8mmHg at 20°C, and is stable at normal temperatures and pressure. At higher temperatures and pH less than 5.5, trichlorfon decomposes to form dichlorvos (0,0-dimethyl-0-(2,2-dichlorovinyl) phosphate, DDVP). It is readily soluble in chloroform and methylene chloride, and less soluble in water, benzene, and diethyl ether. [Pg.2768]

Commonly used water-immiscible solvents in industrial-scale processes include alcohols (isobutanol, -butanol), ketones (particularly methyl isobutyl ketone), acetates (butyl, ethyl, isopropyl), hydrocarbons (toluene, hexanes), and methylene chloride. These solvents are inexpensive, readily available, and exhibit physical properties of low viscosity and density significantly different from water. Common water-miscible solvents are the alcohols (particularly methanol). For laboratory-scale processes, the selection is greater since selection is not constrained by economics. Craig and Sogn (16) have prepared an extensive compilation of such solvents. [Pg.61]

PHYSICAL PROPERTIES Yellow, oily liquid faint, characteristic odor highly soluble in water, alcohol and ether miscible with methylene chloride and vegetable oils BP (153°C, 307°F) MP (not available) DN (1.0048 g/mL at 20°C) VP (2.7 mm Hg at 20°C). [Pg.164]

PHYSICAL PROPERTIES white crystalline solid odor of pepper insoluble in water soluble in acetone, benzene, dioxane, methylene chloride, and ethyl acetate MP (93-95"C, 199.4-203T) BP (310-315°C, 590-599 F) DN (unknown) SG (unknown) VD (NA) VP (3.4 x 10 mmHg at20°C)... [Pg.490]

PHYSICAL PROPERTIES white solid, characterized by four sided, pointed prisms mild, chlorine-like odor turns brown at 212°C (413.6°F), after melting at 132 C (269.6°F) slightly soluble in water freely soluble in chlorinated and highly polar solvents at 25 C, including benzene, chloroform, ethylene dichloride, carbon tetrachloride, methylene chloride, sym-tetrachlorethane, and alcohol MP (132 C, 270 F) BP (unknown) DN (1.5 g/cm at 20°C) SG (1.5) VD (6.8) VP (unknown). [Pg.549]

PHYSICAL PROPERTIES white to light tan crystalline solid a liquid above 106°F (41°C) freely soluble in acetone, carbon tetrachloride, ether, methylene chloride, toluene, and kerosene practically insoluble in water MP (41°C, 106°F) BP (decomposes at 760 mmHg) SG (1.49) VD (NA) VP (8 x 10 mmHg at 20°C). [Pg.874]

The exposure to a chemical product also depends on its physical state and the physical/chemical properties of the component chemicals. Use of paint strippers in a basement may result in exposures to the volatile methylene chloride ten times in excess of the recommended TLV (200 ppm) (82). A chemical used as a floor-tile colorant, however, will be much more stable. Each use must be considered separately with regard to its potential for occupational, general population, and environmental exposure. [Pg.328]

Table 14.4 lists the names and compositions of the fluorinated hydrocarbon solvent blends that were used in the past for cleaning applications. New replacement fluorinated solvents that have zero ozone depletion potential are also listed in Table 14.4. The physical properties of all the fluorinated solvents and blends are listed in Table 14.5. 1,1,2-Trichlorotrifluoroethane (CFC 113) has poor solvency for the soils normally encountered in cleaning operations. The patented Freon formulations from DuPont utilize CFC blends containing acetone, methanol, ethanol, isopropanol, and methylene chloride (Table 14.4)... Table 14.4 lists the names and compositions of the fluorinated hydrocarbon solvent blends that were used in the past for cleaning applications. New replacement fluorinated solvents that have zero ozone depletion potential are also listed in Table 14.4. The physical properties of all the fluorinated solvents and blends are listed in Table 14.5. 1,1,2-Trichlorotrifluoroethane (CFC 113) has poor solvency for the soils normally encountered in cleaning operations. The patented Freon formulations from DuPont utilize CFC blends containing acetone, methanol, ethanol, isopropanol, and methylene chloride (Table 14.4)...
In most environmental laboratories the classical liquid-liquid extraction using the separatory funnel is still the most used technique to extract semivolatile organic compounds, pesticides, and PCBs from aqueous samples. Methylene chloride (MeCl), although a potential health hazard, is one of the most commonly used solvents. Several physical properties make it advantageous to use. These properties are listed in Table 15.5. [Pg.794]


See other pages where Methylene chloride, physical properties is mentioned: [Pg.326]    [Pg.101]    [Pg.904]    [Pg.326]    [Pg.532]    [Pg.85]    [Pg.2258]    [Pg.180]    [Pg.184]    [Pg.2801]    [Pg.42]    [Pg.18]    [Pg.141]    [Pg.340]    [Pg.73]    [Pg.51]    [Pg.33]    [Pg.271]    [Pg.156]    [Pg.8]    [Pg.2953]    [Pg.5937]    [Pg.6169]    [Pg.669]    [Pg.676]    [Pg.81]    [Pg.232]   
See also in sourсe #XX -- [ Pg.366 ]




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