| 摘要 |
<p>Appts. for the discontinuous prodn. of polyesters has a cylindrical vertical jacket having devices for supplying the reactants and for discharging the polyester, and enclosing a lower zone with gas inlet pipes, a heated upper zone with a pipe for withdrawing volatile prods. and gases, and a central zone with heated vertical channels connecting the connecting the upper zone to the lower zone. Introduction of the gas phase is effected so that the liquid contg. the gas flows through the vertical channels, while the liquid flowing through the tube contains practically no gas. Efficient removal of excess volatile prods. and water is obtd. with high ratio of heat exchange surface to reaction volume and short reaction times. Polyesters may be produced directly from acids, e.g. adipic acid, and alcohols, e.g. a mixt. of butanediol-1, 4 and ethylene glycol.</p> |
