| 摘要 |
<p>The present invention relates to a semi-continuous method for the production of polyadducts of alkylene oxide by an addition reaction of alkylene oxide on a chain initiator having at least one active hydrogen. In the method of the present invention, there is provided a reactor (1) constituted by a cylindrical body with two diameters, the upper part being of larger diameter than the lower part, heat-exchange means (2) and recycling ducts (13, 15) for the recycling of the reaction mixture from the bottom to the head of the reactor in order to obtain the final desired product. The process of the present invention enables the production to be carried out with greater flexibility and reduces down times; with the use of the aforesaid reactor it is in fact possible to start the process with a volume of chain initiator of up to 1/90 of the volume of the final reaction product, allowing very high molecular weights to be reached in a single production batch or, if necessary, smaller quantities of polyadduct for the same growth.</p> |
