| 摘要 |
FIELD: chemistry. ^ SUBSTANCE: preheated oil from a reservoir 9 is loaded into reactor 5 with an agitator 2 and reactor heating thereafter enabled. Dissolved white resin is loaded. After 250C is achieved, nitrogen feed is disabled, while the reactor 5 is connected to a vacuum network. Pentaerithrit and lead siccative are loaded into the reactor 5. Then a reactor degassing system is disabled with enabled inert gas feeding and continued heating of reaction mixture. After re-etherification process is complete, heating of the reactor 5 is disabled, while the reaction mixture is cooled. Phthalic anhydride and maleic anhydride are loaded into the reactor 5. For simplifying water extraction from the reaction zone, xylene from the reservoir 10 is introduced into the reactor 5 by an industrial pipe-line with a pump 46. Water vapour as an azeotrope mixture, together with xylene vapour are directed to a packed column 26 and a refrigerator 27. Resin from the reactor 5 is discharged to a mixer 11. Solvent vapour generated in resin dissolving is delivered to a heat exchanger 33, wherein condensed and flow down back to the mixer 11. ^ EFFECT: stable characteristics of technological process and improved fire and environmental safety. ^ 20 cl, 2 dwg |
