Ketone methyl ethyl

This was the first ketone to be subjected to a detailed examination [39- 42] and it has recently been studied again [43(a)- -(c)]. 

Bardwell and Hinshelwood [39] established the existence of a region in which the rate of reaction decreased with rising temperature the regions of temperature and pressure in which slow reaction, single and multiple cool flames and explosion occurred were also mapped out [40] (Fig. 4). 

Later work [37(a)] has shown that under these conditions there are appreciable temperature changes, even in slow combustion, and therefore the detailed interpretation originally offered [40] cannot be wholly correct nevertheless there is good evidence that peroxide branching is important in the low temperature reaction and Bardwell and Hinshelwood suggested [40, 42]. 

The most striking feature of the slow combustion of methyl ethyl 

The length of the induction period is greatly reduced by the addition of acetaldehyde, but this does not affect either the maximum rate or the maximum peroxide concentration, which is reached at the time at which the rate of reaction is also greatest [41]. 

No mutagenic or carcinogenic effects have been reported. 

Acetone is burned in a chemical incinerator equipped with an afterburner and scrubber. Small amounts may be disposed down the drain with an excess of water. Acetone may be destroyed by oxidizing with potassium permanganate (National Research Council 

A 20% excess of permanganate solution is slowly added to an aqueous solution of acetone the mixture is refluxed. When the 

Acetone is analyzed by GC-FID. A Car-bowax 20 M, Carbopack, fused-silica capillary column, or any equivalent column may be suitable. It may be analyzed by GC/MS using a purge and trap technique or by direct injection. Characteristic ions are 43 and 58 (electron-impact ionization) (U.S. EPA 1986, Method 8240). Acetone in air is adsorbed over coconut shell charcoal, desorbed with CS2, and analyzed by GC-FID using a 10% SP-2100 or DB-1 fused-silica capillary column (NIOSH 1984, Method 1300). Airflow rate 10 to 200mL/min volume 0.5-3 L of air. Trace acetone in water can be determined by the fast HPLC method discussed in Chapter 5. 

EPA Classified Toxic Waste, RCRA Waste Number U159 DOT Label Flammable Liquid UN 1193 

---

The properties of the solids most commonly encountered are tabulated. An important problem arises for petroleum fractions because data for the freezing point and enthalpy of fusion are very scarce. The MEK (methyl ethyl ketone) process utilizes the solvent s property that increases the partial fugacity of the paraffins in the liquid phase and thus favors their crystallization. The calculations for crystallization are sensitive and it is usually necessary to revert to experimental measurement. 

Methyl ethyl ketone. Use the apparatus of Fig. Ill, 61, 1 but with a 500 ml. round-bottomed flask. Place 40 g. (50 ml.) of see. butyl alcohol, 100 ml. of water and a few fragments of porous porcelain in the flask. Dissolve 100 g. of sodium dichromate dihydrate in 125 ml. of water in a beaker and add very slowly and with constant sturing 80 ml. of concentrated sulphuric acid allow to cool, and transfer the resulting solution to the dropping funnel. Heat the flask on a wire gauze or in an air bath until the alcohol mixture commences to boil. Remove the flame and run in the dichromate solution slowly and at such a rate that the temperature... 

The p-substituted amino ketones can be reduced readily to the more stable P-dialkylamino alcohols, many of which are useful local anaesthetics. Thus the local anaesthetic Tutocaine is made from the Mannich base derived from formaldehyde, methyl ethyl ketone and dimethylamine, followed by reduction and conversion into the p-aminobenzoate ... 

Methyl ethyl ketone is allowed to react with n-butyl or iso-amyl nitrite in the presence of hydrochloric acid to yield diacetyl monoxime (nitrosomethyl ethyl ketone) ... 

Science dealerships aren t the only places to get the stuff one needs. At those mega hardware stores one can find pure acetone, methanol, ethanol, toluene, methyl ethyl ketone, DCM(as a constituent of some stripping agents), sodium hydroxide in the form of lye, and some acids such as sulfuric and hydrochloric. These precious tools can be bought there cheaply and in great quantity. 

METHOD 4 [115]-80% phenol in aqueous H2SO4 soiution of pH 3 is brought to 50 C. 30% H2O2 is then added causing an exothermic reaction and a temperature of 15 C over 3-4 minutes time. 6% aqueous H2SO3 is added after 4.5 minutes, the solution quickly cooled and extracted with isopropyl acetone (Strike would think that another solvent like methyl ethyl ketone could be used) to give 60% catechol. 

The osmotic pressure of polystyrene fractions in toluene and methyl ethyl ketone was measuredt at 25°C and the following results were obtained ... 

Fraction number Toluene Methyl ethyl ketone ... 

Figure 10.8 shows two sets of data plotted according to these conventions, after correction for the effect of interference. In Fig. 10.8a, HC2/T is plotted against C2 for three different fractions of polystyrene in methyl ethyl ketone. Figure 10.8b shows Kc2/Rg versus C2 for solutions of polystyrene in cyclohexane at five different temperatures. These results are discussed further in the following example.

Figure 10.8 Light-scattering data plotted to give slope-intercept values which can be interpreted in terms of M and B. (a) Polystyrene in methyl ethyl ketone. [From B. A. Brice, M. Halwer, and R. Speiser,/. Opt. Soc. Am. 40 768 (1950), used with permission.] (b) Polystyrene in cyclohexane at temperatures indicated. Units of ordinates are given in Example 10.4. [Reprinted with permission from W. R. Krigbaum and D. K. Carpenter,7. Phys. Chem. 59 1166 (1955), copyright 1955 by the American Chemical Society.]...

Bhatnagar and Biswast measured the turbidity at 436 nm of 2l single sample of poly(methyl methacrylate) in several solvents, including acetone and methyl ethyl ketone (MEK) ... 

This oxidation process for olefins has been exploited commercially principally for the production of acetaldehyde, but the reaction can also be apphed to the production of acetone from propylene and methyl ethyl ketone [78-93-3] from butenes (87,88). Careflil control of the potential of the catalyst with the oxygen stream in the regenerator minimises the formation of chloroketones (94). Vinyl acetate can also be produced commercially by a variation of this reaction (96,97). 

Acetone, Methyl Ethyl Ketone, and Methyl Isobntyl Ketone, KeportNo. 77, May 1972, Process Economics Program, SRI CEH, SRI International, Menlo Park, Calif, p. 604.5000 E. Contains detailed process information. 

---