Methyl, alcohol violet

Factors affecting laboratory polymerisation of the monomer have been discussed" and these indicate that a Ziegler-Natta catalyst system of violet TiCl3 and diethyl aluminium chloride should be used to react the monomer in a hydrocarbon diluent at atmospheric pressure and at 30-60°C. One of the aims is to get a relatively coarse slurry from which may be washed foreign material such as catalyst residues, using for example methyl alcohol. For commercial materials these washed polymers are then dried and compounded with an antioxidant and if required other additives such as pigments. 

Uses Manufacture of vanillin, Michler s ketone, methyl violet, and other dyes solvent reagent for methyl alcohol, hydrogen peroxide, methyl furfural, nitrate, and formaldehyde chemical intermediate stabilizer reagent. 

Similarly with the raising of the b.p. in violet or reddish-violet soln. of iodine in benzophenone, carbon disulphide, ethyl chloride, chloroform, carbon tetrachloride, ethylene chloride or benzene or in brown soln. of ethyl alcohol, methyl alcohol, thymol, ethyl ether, methylal, or acetone. The values for the last three solvents were rather low, presumably because of the chemical action of solute on solvent. High values with benzene are attributed to the formation of a solid soln. of solvent and solid. Confirmatory results were found by J. Hertz with naphthalene, and by E. Beckmann and P. Wantig with pyridine. The results by I. von Ostromisslensky (o-nitrotoluene), by G. Kriiss and E. Thiele (glacial acetic acid), and by H. Gautier and G. Charpy indicate polymerization, but they are not considered to be reliable. 

Comparison of the electrical conductivities of chromium penta-phenyl hydroxide, sodium hydroxide and ammonia in absolute methyl alcohol and in methyl alcohol-water solution, shows that the former is a very strong base. In aqueous methyl alcohol solution the chromium compound does not appear to approach the limiting value with increasing dilution. The ultra-violet absorption spectrum examined in absolute ethyl alcohol solution resembles that of chromic acid and the dichromates, but the absorption is noticeably greater in the case of the organic compound. 

The chief impurities in commercial ether are alcohol and water, with traces of aldehyde, methyl alcohol, acetone, due to it being made from methylated spirit. It may be purified as above. The presence of alcohol may be proved by shaking with a spirit soluble dye, e.g., aniline violet. If alcohol is present a blue solution is obtained. Water is detected by the cloudiness formed on mixing with carbon disulphide. 

A solution of 8-6 grams of 5-nitro-6-amino-j i-tolylarsinic add in 75 c.c. of water and 6 2 c.c. of lOAT sodium hydroxide solution is cooled to —1° C. and 20-4 grams of sodium hydrosulphite added in one oiJeration. When the reaction is complete the solution is filtered and 8-1 c.c. of hydrochloric acid (density 1 12) added. The arsinic acid separates and is recrystallised from water. It forms colourless needles, containing 1J to 2 mols. of water of crystallisation. It is soluble in methyl alcohol and acetic acid, sparingly soluble in ether, benzene, and petroleum. Its solution in dilute hydrochloric acid gives a chai acteristic deep violet coloration with a drop of dilute solution of potassium dichromate. 

One other piece of evidence bears on the difference between the two ThCps compounds. The green compound releases a half a molecule of hydrogen per thorium atom when treated with methyl alcohol (369), whereas the violet compound is reported to yield only i of a molecule of hydrogen per thorium atom (355). On this evidence it has been suggested that the violet compound should be... 

The iodide, C2oHi7(CH3)4NgT,CH3l-l-H20, is prepared by heating rosaniline with methyl iodide and methyl alcohol to 100°. It is freed from any violet dyestuff present in the same manner as methyl green. 

Methyl alcohol may be detected and estimated by conversion to methylaniline by means of iodine, phosphorus and aniline, followed by oxidation by stannic chloride to methyl violet. Other methods depend upon the conversion of the methyl alcohol to formaldehyde, which gives various colour reactions, with morphine sulphate and with fuchsine bisulphite. 

D. Coster, and 0. Stelhng studied the X-ray spectrum and D. M. Yost, the absorption of X-rays. I. PlotnikofE and M. Karshulin measured the absorption spectrum and the region of photochemical sensitivity for soln. of potassium chromate in colloidion films—with methyl alcohol as acceptor. A. Kailan found that an aq. soln. of potassium chromate is reduced by radium rays more slowly than potassium dichromate. E. Montignie observed that after exposure to ultra-violet light, potassium chromate affects a photographic plate. 

L. G. Winston and H. C. Jones, and E. J. Schaeffer and H. C. Jones. A. W. Speransky also found that the conductivity of the violet soln., at 25°, is jLi25 =324-5 when that of the green soln. under similar conditions is p,25 =126. This is taken to prove that the violet salt furnishes more ions per mol than is the case with the green salt. F. Jost found for the conductivity of the violet salt in methyl alcohol. 

The phosphoric acid process was found to give higher yields of formaldehyde than the similar method of Simmonds. The violet colour produced is matched against standards prepared with known amounts of methyl alcohol in ethyl alcohol. The best conditions for colour development are given with quantities of between 0 0001 and 0 001 ml of methyl alcohol in 5 ml of test solution. The original paper contains a comprehensive list of interfering substances, nearly all of which may be removed by one of the methods for alcohol determination (p. 778). Formaldehyde is removed by the following process ... 

An unexpected phenomenon was observed by Ballard and Hersant in this test for methyl in ethyl alcohol if the decolorised solution of magenta is added at a temperature of 10° or less, an immediate violet colour is produced. This colour differs distinctly from the magenta colour obtained with small amounts of methyl alcohol and is probably due to interaction with acetaldehyde a reaction temperature of 15° to 30° is necessary. Further, since a pale greenish-yellow colour is given in the official test by acetaldehyde and traces of formaldehyde produced from the ethyl alcohol itself, the authors recommend that an auxiliary solution should be used for compensation. By trial, an auxiliary containing 2-5 ml of 10 per cent ethyl alcohol, 2-5 ml of water and 0-20 mg of methyl alcohol was found to match the primary solution in the absence of methyl alcohol. 

A more sensitive and specific test for the detection and determination of methyl alcohol has been developed by Boos depending on the use of chromotropic acid. This reagent gives an intense violet-red colour with formaldehyde in the presence of sulphuric acid. 

Methyl green, hexamethylpararosaniline hydroxymethylate (component of mixed indicator) dissolve 0.1 g in 100 mL alcohol when used with equal parts of hexamethoxytriphenyl carbinol gives color change from violet to green at a titration exponent (pi) of 4.0. 

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