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公开(公告)号：US5052123A
公开(公告)日：1991-10-01
申请号：US547304
申请日：1990-07-03
CPC分类号： B29B13/065
摘要： Polyamide granules are dried and heated by feeding a suspension of granules in water into a sieve (1), where the bulk of the water is removed, and then into a tower dryer (10), where they are deposited in bed form and then freed of the remaining water while moving in plug flow under the force of gravity with a counter-current inert gas stream at from 70.degree. to 200.degree. C. The tower dryer possesses an inlet at the top (11) and outlet at the bottom (34) for the granules and also feed lines (20, 22, 31) for the inert gas. To achieve a uniform degree of drying of the granules, the inert gas is divided on entry into the tower dryer at a point between the drying zone and the heating zone into a stream which flows radially inward into the bed of granules on the one hand and a stream which flows radially inward and outward on the other. In this way the inert gas is distributed particularly uniformly and the granules are dryable in a very short drying zone down to a water content of 0.0001 kg of water/kg of polymer. The lower, conically tapered area of the tower dryer--bin 30--ensures a uniform rate of descent of the granules and hence a uniform solid-phase condensation with a favorable molecular weight distribution. The tower dryer (10) is followed by a fluidized bed cooler (41) in which the granules are cooled with air to
摘要翻译： 将聚酰胺颗粒干燥并通过将颗粒在水中的悬浮液加入到筛子（1）中，其中大部分水被除去，然后进入塔式干燥器（10），在塔式干燥器（10）中以床形式沉积然后释放 的剩余水，同时在重力作用下用70度到200度的逆流惰性气流在活塞流中移动。塔式干燥器具有顶部（11）和底部出口（34）的入口 ）和用于惰性气体的进料管线（20,22,31）。 为了实现颗粒的均匀干燥程度，惰性气体在干燥区域和加热区域之间的一段入口处分成塔式干燥器，一方面径向向内流入颗粒床， 另一端径向向外流动的气流。 以这种方式，惰性气体分布特别均匀，并且颗粒在非常短的干燥区域中可干燥至0.0001kg水/ kg聚合物的含水量。 塔式干燥器箱30的下锥形锥形区域确保了颗粒均匀的下降速率，因此具有均匀的固相冷凝并具有良好的分子量分布。 塔式干燥器（10）之后是流化床冷却器（41），其中颗粒用空气冷却至<50℃。
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