Acetone isopropanol

Dinitrotoluene [121-14-2] M 182.1, m 70.5-71.0 . Crystd from acetone, isopropanol or MeOH. Dried under vacuum over H2SO4. Purified by zone melting. Could be EXPLOSIVE when dry. 

The methacrylic backbone structure makes the spherical Toyopearl particles rigid, which in turn allows linear pressure flow curves up to nearly 120 psi (<10 bar), as seen in Fig. 4.45. Toyopearl HW resins are highly resistant to chemical and microbial attack and are stable over a wide pH range (pH 2-12 for operation, and from pH 1 to 13 for routine cleaning and sanitization). Toyopearl HW resins are compatible with solvents such as methanol, ethanol, acetone, isopropanol, -propanol, and chloroform. Toyopearl HW media have been used with harsh denaturants such as guanidine chloride, sodium dodecyl sulfate, and urea with no loss of efficiency or resolution (40). Studies in which Toyopearl HW media were exposed to 50% trifluoroacetic acid at 40°C for 4 weeks revealed no change in the retention of various proteins. Similarly, the repeated exposure of Toyopearl HW-55S to 0.1 N NaOH did not change retention times or efficiencies for marker compounds (41). 

This Crude product (15.8 g) In water (360 ml) was added to a prehydrogenated suspension of 10% palladium on charcoal (4 g) in water (400 ml), and hydrogenation was continued for 30 minutes. The catalyst was removed and the filtrate was adjusted to pH 7.5 with sodium bicarbonate, then evaporated at low temperature and pressure. The residue was purified by chromatography on a column of cellulose powder, eluting first with butanol/ ethanol/water mixture and then with acetone/isopropanol/water. The main fraction was evaporated at low temperature and pressure to give a 32% yield of the sodium salt of a-carboxybenzylpenicillin as a white powder. The product was estimated by manometric assay with penicillinase to be 58% pure. 

Solubility. Soluble in water (20 g/L at 25 °C) and benzene very soluble in acetone, isopropanol and methanol slightly soluble in carbon tetrachloride and xylene (Ameribrom, 1996)... 

The advances in column and instrument technology have significantly enhanced HPLC performance in recent years. Results comparing the effects of various column packings on TG separation by RP-HPLC were presented by El-Hamdy and Perkins (87). Six commercially packed columns produced by different manufacturers were used PARTISIL ODS-1 and ODS-2 octadecyl-bonded silica of 10-/rm partical size, ZORBAK-ODS octadecyl-silica of 6-7-/rm diameter (250 X 4.6-mm ID), 5-/rm octyl-bonded spherical silica LC-8, 5-//m methyl-bonded spherical silica LC-1, and a 5-/rm octadecyl-bonded spherical silica LC-18 (150 X 4.6-mm ID). The mobile phase employed consisted of mixtures of methanol/acetone/isopropanol/acetonitrile ranging from l 0 3 4to 1 6 3 4. Triglycerides were solubilized in either THF or acetone at 100 mg/ml for each compound. 

By conducting further experiments in different solvents, such as acetone, isopropanol, ethanol, and toluene, it was found that application of APS from an aqueous solution gave the best results. Extensive experimentation with the polymeric dimethoxy- and trimethoxysilanes, PS076.5 and PS076 respectively, gave similar results. Representative data for PS076.5 are shown in Table 2. Application from 0.5 wt% solutions in water produced the maximum IFSS and retention after exposure to 1 h boiling in water. 

Steel, copper, and most other metal coupons should be cleaned by washing under running water and brushing to remove any loose deposits. If oily, first wash with acetone/isopropanol (IPA). Further clean by immersion in concentrated HCl for 15 seconds. Treat again with HCl and brushing or use of a plastic knife, if necessary, to remove tenacious deposits. Dip in acetone, then IPA, and finally dry in a desiccator prior to weighing. 

Tessag Edeleanu GmbH Acetone Isopropanol Dehydrogenation reaction with copper-containing catalyst 3 1983... 

Kvaerner Process Technology Amines, Isopropyl Acetone/isopropanol and ammonia Synthesis of monoisopropylamine at hijji-purity 6 1992... 

Some secondary reactions also occur giving peroxides of aldehydes and acids. The water-peroxide-acetone-isopropanol mixture is fractionated by distillation. 

The similar behavior of 6c versus 0c Plols for silica is shown in Fig. 9a,b, where data for several C-solvents (ethyl ether, ethyl acetate, acetone, isopropanol) in admixture with hexane or pentane are plotted as experimental values of [best fit to Eq. (12)1 versus experimental values of 0c. The data for isopropanol (solid circles) are displaced to the right... 

Dispersive Liquid-Liquid Microextraction The aforementioned SDME method, although it significantly reduces solvent consumption, is not free from drawbacks such as low extraction efficiency and slowly reached equilibrium. In many cases, the extraction efficiency can be increased by using dispersive systems such as the emulsion of organic solvent in an aqueous sample. In dispersive liquid-liquid microextraction (DLLME), a mixture of two solvents (extraction solvent and disperser) is injected by syringe into an aqueous sample. The extraction solvent is a water-insoluble and nonpolar liquid such as toluene, chloroform, dichloro-methane, carbon tetrachloride, or carbon disulfide. A water-miscible, polar solvent, typically acetonitrile, acetone, isopropanol, or methanol, is used as disperser. The typical concentration of extractant in such a mixture is in the range 1-3 %. 

Prominent examples are the redox pairs o- or p-quinones/hydroquinones, the corresponding quinoneimines, the diimines and the azobenzenes and disulfides [68]. V. Stackelberg [69] has pointed out that the exclusive formation or cleavage of 0-H, N-H, S-H, or S-S bonds is a necessary precondition for reversible organic redox partners. This can be clearly recognized in the case of the quinone/hydroquinone redox reaction (cf. Eq. (13)). Only O -H bonds are formed or cleaved. In contrast, in the case of the acetone/isopropanol redox system, 0-H and C-H bonds participate. 

Figure 1. Results of PFG NMR measurements of the self-diffusivities of acetone, isopropanol, propene, and water in NaX...

Lorr NA, Miller KW, Chung HR, et al. 1984. Potentiation of the hepatotoxicity of N-nitrosodimethylamine by fasting, diabetes, acetone, isopropanol. Toxicol Appl Pharmacol 73 423-431. 

All films were deposited by thermal evaporation in a base pressure of about 10 mbar, at a rate in the range 0.5-1.0 A/s. Before the deposition of the organic compounds, ITO substrates were cleaned in acetone, isopropanol and deionized water for 10 min at 60 °C in an ultrasonic bath. No plasma oxygen was performed because of the electrical dopang of the transport layers. 

The substrate specificity of AOD from different microbial sources has been studied in detail. Yeasts cultivated on methanol produce large amounts of AOD together with catalase. This AOD has a high activity towards methanol. Ethanol is oxdized more rapidly only by AOD from Basidiomycetes. AOD also reacts with other aliphatic alcohols, mercap-tans, and formaldehyde. Acetone, isopropanol, lactate, and other hy-droxyacids do not react. Because of the high catalase content of the... 

Shown in Figure 8-7 is a 12-port drying chamber. It is made of stainless steel, usually weld free to minimize vacuum leaks, and contains an inner chamber about 7-10 cm smaller in diameter. The inner chamber is filled with dry ice and acetone or isopropanol and is the chamber usually used to freeze the sample when it is first prepared. It is about 30 cm high and 22-25 cm in diameter. The progress of the sublimation can be followed roughly by watching the dry ice-acetone (isopropanol) mixture. As the ice condenses, the coolant will boil off the COj in it - sometimes so vigorously early in the process that the pressure may have to be increased a bit to slow down the sublimation. 

Light yellow oil, aromatic odor, d25 1.268. ng 1.6021. Practically insol in water. Miscible with benzene, toluene, xylene, acetone, isopropanol, methanol. LD, in female, male rats (mg/kg) 7.7, 36 orally 25, 230 derm ally (Gaines). 

Example Erhomid RO/6G d 1,143 (9.52 Ibs/gnO surface tension of 0,1% aq soln 47 dynes/cm, of 1.0% aq soln 46 dynes/cm Sol in water (1% soln still clear at bp), benzene, ligroin CCl4 dioxane acetone isopropanol. use Detergents manuf feed supplements. 

The 4-phenol deriv. in acetone/isopropanol (1 1), and cat. benzyltriethylammonium chloride with H O stirred at 30-5 3 moles ClCHjFj added (0.5h ). After 5 min. aq NaOH (1 mole), then 3 moles added (0.25h.) mixture stirred for Ih. 

Aluminium isopropoxide is a Lewis acid and it is also a good catalyst for the Oppenauer oxidation and Meerwein-Ponndorf-Verley reduction reactions. In the presence of a ketone, it will oxidise d-isomenthol to d-isomenthone (Oppenauer oxidation). The hydrogen atom on C-4 is now enolisable and therefore epimerisation can occur, catalysed by the aluminium isopropoxide acting as a Lewis acid. This will give /-menthone. This can now be reduced (Meerwein-Ponndorf-Verley reduction) to /-menthol by an alcohol and aluminium isopropoxide. The ketone and alcohol for the redox reactions could be the menthols/ menthones themselves or traces of acetone/isopropanol in the aluminium isopropoxide. Obviously, the reactions shown in Figure 4.28 are all reversible. The equilibrium will eventually be driven over completely to /-menthol since the latter is the most thermodynamically favoured of all of the isomeric components in the system. 

Methylpentylketone from the acetone/isopropanol/n-butanol reaction at 520 K, low pressure, LHSV 1, with major side reactions to acetone and heavier condensation products. The primary reaction is ... 

PHYSICAL PROPERTIES liquid or pale-yellow crystals a brown liquid above 97°F aromatic odor nearly insoluble in water miscible with benzene, toluene, xylene, acetone, isopropanol, and methanol MP (36°C, 97°F) BP (unknown) DN (1.268 g/mL at 25°C) LSG (1.27 at 25°C) VD (not applicable) VP (0.0003 mmHg at 212°F). 

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