Higher brominated pyrene prepn. - by reacting pyrene-contg. coal tar fraction with chlorine and bromine at room temp. in soln.Higher brominated pyrenes, (I) are prepd. by letting 4.4g atom Br2 and 4.4 g atom Cl2 act simultaneously, at 20-30 degrees C, in a solvent, on 1 mol pyrene...
Properties:Dark reddish-brown, volatile, mobile, diatomic liquid; suffocating odor; vaporizes rapidly at room temp. Only nonmetallic element liquid at standard conditions. Nonflammable, but may ignite combustibles on contact. Corrosive material. mp -7.25° (265.90 K); bp 59.47°(JANAF Thermochemical ...
(FR1025M, average particle size of 5-8 micron) and 8 gr antifoam, followed by 1 gr biocide. Stir the obtained dispersion for another 10 minutes. Grind the obtained dispersion with High Sheer Homogenizer, such as IKA Ultraturax T-50 for 20 minutes while keeping the temp at maximum 30°...
When the last portion had been added, the reactioon was allowed to proceed 2 additional hours at 95° C., after which time D was added and the product cooled to room temperature. Conversion -- 98%; color -- colorless, slightly hazy; acid number -- 25 and I.V. in toluene -- 0.12...
Higher brominated pyrene prepn. - by reacting pyrene-contg. coal tar fraction with chlorine and bromine at room temp. in soln.Higher brominated pyrenes, (I) are prepd. by letting 4.4g atom Br2 and 4.4 g atom Cl2 act simultaneously, at 20-30 degrees C, in a solvent, on 1 mol pyrene...
Br2 with conc. H2SO4 in counter-current at room temp. esp. 20 degrees C to 30-50 pref. 35 ppm residue. Br2 purified in this way is suitable for special organic syntheses and practically non-corrosive to transport and storage vessels, pipes and pump aggregates of Monel metal or Pb....
The mixture was stirred and heated at 98-102 deg. C. for 24 hours. After cooling to room temperature, 1 liter of water was added with stirring for one hour and filtered. The filter cake was washed on the filter with 250 ml of water and 500 ml of toluene and dried (80 deg. C. ...
Into a 1-liter flask equipped with a mechanical stirrer, a condenser, a thermometer and a dropping funnel, are introduced, at room temperature, 1.24 g iodine and 427 g H2SO4 (97%) and, with stirring and cooling, 316 g oleum (65% free SO3). 246 g (2 mole) nitrobenzene is added ...
Higher brominated pyrene prepn. - by reacting pyrene-contg. coal tar fraction with chlorine and bromine at room temp. in soln.Higher brominated pyrenes, (I) are prepd. by letting 4.4g atom Br2 and 4.4 g atom Cl2 act simultaneously, at 20-30 degrees C, in a solvent, on 1 mol pyrene...
H2SO4 at room temp. to a residual contamination of 30-50 ppm. The bromine remaining in the still is recovered by separate distillation. By this method, bromine having high content of organic impurities (1000-10000 ppm) can be purified. The energy consumption is low....