PHTHALIC ANHYDRIDE.2 Vol

To test this prediction, a solution of o-sulphobenzoic anhydride (0-02 mole) in benzene (0-4 mole) was pyrolyzed at 690°, with a contact time of 18 sec. The pyrolysate, after removal of benzene, weighed 2 2 g. The product mixture, determined by mass spectrometry, is shown in Table 14 together with the products from identical pyrolyses of benzene (35-5 ml) alone (0-3 g product) and of phthalic anhydride (2 96 g 002 mole) in benzene (35-5 ml) (2-6 g product) for comparison. Relative concentrations (vol. %) of the three components for which we have the requisite calibration data (naphthalene biphenyl 3,4-benzocoumarin = 71 100 21) match closely the relative intensities shown in Table 14,... 

The phthalide used by the submitters and by the checkers was a commercial product, obtained from E. I. du Pont de Nemours and Company, Wilmington, Delaware. This product is no longer available. Phthalide may be prepared in 82.5 per cent yields by hydrogenation of phthalic anhydride in benzene at 270° under 3000 lb. pressure in the presence of copper chromite 1 or, in yields of 61-71 per cent, from phthalimide according to the procedure given in Org. Syn. 16, 71 Coll. Vol. 2, 1943, 526. 

Phthalic anhydride - [ALKYD RESINS] (Vol 2) - [COATINGS] (Vol 6) - [COATINGS] (Vol 6) - [COLORANTS FORFOOD, DRUGS, COSMETICS AND MEDICALDEVICES] (Vol 6) - [FLAME RETARD ANTS - RETARDANTS] (Vol 10) - [FINECHEMICALS - PRODUCTION] (Vol 10) -cesium mprdn of [CESIUM AND CESIUM COMPOUNDS] (Vol 5)... 

Dehydration of nitroalcohols and their esters. Nitroalcoliols obtained by the Henry rnethod can be readily dehydrated with phthalic anhydride (Vol. t. 

Catalytic properties of the synthesized samples after activation were examined in the hydrocarbon-air reaction mixture in reactions of the oxidation of i) n-butane (1.7 vol. % in air) to maleic anhydride, ii) butene-2 (1.6 vol. % in air) to maleic anhydride, iii) n-pentane (1.2 vol. % in air) to maleic and phthalic anhydrides, and iv) propane (1.8 vol. % in air) to acrylic acid. Catalytic tests were performed in the flow system with GC control of the reaction products. 

Benzanthracene, Benzlajanthracene 2,3-benzphenanthrene tetraphene benzanthrene naphthanthra-cene. C,HI2 mol wt 228.28. C 94.70%, H 5.30%. Occurs in coal tan Cook el at. J. Chcm. Soc. 1933, 395. Synthesis from naphthalene and phthalic anhydride Elbs, Her. 19, 2209 (1886). From o-to uy] naphthalene Fieser, Dietz, Ber. 62, 1827 (1929). From phenanthrene and succinic anhydride Haworth, Mavin, J. Chcm. Soc. 1933, 1012. Absorption spectrum Capper, Marsh, J. Chem. Soc. 1926, 726 Clar. Ber. 65, 507 (1932) Mayneord, Roe, Proc. Roy. Soc. London A152, 299 (1935). Review E. Clar. Polycyclic Hydrocarbons (Academic Press, New York, 1964) 2 vols. 

Phthalic anhydride. The feedstocks are either naphthalene or o-xylene, the process being a catalysed air oxidation (see Vol. I, pp. 293, 317, 368). The product is required in large quantities by the plastics industry, the intake in the dye industry being only minor in quantity. It is the feedstock for phthalocyanine production and in the synthesis of anthraquinone intermediates, e.g. quinizarin (for disperse dyes) and 2-methylanthraquinone (for acid dyes). 

Figure 6. Response curves of n-pentane oxidation (a) and formation of maleic (b) or phthalic (c) anhydrides after stopping MTBE addition. (Conversion of n-pentane, and the amount of MA or PA formed are normalised to the values before MTBE addition). Experimental conditions n-pentane 1.5 vol.%, oxygen 20 vol.%, and 0.6 vol.% of MTBE reaction temperature 365 C, void section 7 cm. ti/2 is half time, namely the time necessary after stopping of MTBE to reach one half of its steady-state value before the MTBE was injected.

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