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公开(公告)号:US06187901B1
公开(公告)日:2001-02-13
申请号:US09367381
申请日:1999-08-13
IPC分类号: C08G6308
摘要: The invention relates to a method for the removal of lactide from polylactide and recovery of lactide from a lactide-containing gas by cooling the hot lactide-containing gas, wherein a polymer melt traveling through a nozzle forms thin threads the surface area of which is so large that in a normal-pressure or vacuum evaporator the lactide evaporates from the polymer rapidly into a hot carrier-gas flow and the polymer settles under gravity onto a collecting device. A hot lactide-containing gas is cooled rapidly to a temperature below 100° C., whereupon the lactide crystallizes from gas, forming lactide crystals, which are separated from the gas.
摘要翻译: 本发明涉及从聚丙交酯中除去丙交酯并从含丙交酯的气体中回收丙交酯的方法,其中,通过冷却含丙交酯的气体,其中通过喷嘴流动的聚合物熔体形成薄的螺纹,其表面积如此 大的是,在常压或真空蒸发器中,丙交酯从聚合物快速蒸发成热载气流,聚合物在重力作用下沉降到收集装置上。 将含热丙交酯的气体快速冷却至低于100℃的温度,随后丙交酯从气体中结晶,形成与气体分离的丙交酯晶体。
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2.
公开(公告)号:US6045688A
公开(公告)日:2000-04-04
申请号:US921384
申请日:1997-08-29
申请人: Seppo Ruottu , Kari Kaariainen , Jyrki Hiltunen
发明人: Seppo Ruottu , Kari Kaariainen , Jyrki Hiltunen
CPC分类号: C10G11/18 , B01J8/0055 , B01J8/1854 , B01J8/26 , C07C5/333 , Y02P20/584 , Y02P30/446 , Y10S585/924
摘要: The invention relates ro a method of converting hydrocarbons. According to the method, a gaseous or liquid hydrocarbon feed is passed into a circulating fluidized-bed reactor, wherein the feed is converted at a high temperatue under the influence of particulate matter kept in a fluidized state, and the converted hydrocarbon products are removed from the reactor in a gaseous phase. According to the invention, a circulating fluidized-bed reactor (1-3; 41-43) is used having an axially annular cross section and being equipped with a multiport cyclone (14,17; 52,63) for the separation of the particulate matter from the gas-phase reaction products. The reaction space comprises an intershell riser space (13; 50) formed between two concentrically located cylindrical and/or conical envelope surfaces. The separation of particulate matter from the gas-phase reaction products is performed by means of a multiport cyclone equipped with louvered vanes (14; 63).
摘要翻译: 本发明涉及转化烃的方法。 根据该方法,将气态或液态烃进料通入循环流化床反应器,其中在保持流化状态的颗粒物质的影响下,进料在高温下转化,并将转化的烃产物从 反应器处于气相。 根据本发明,使用循环流化床反应器(1-3; 41-43),其具有轴向环形横截面并且装备有用于分离颗粒物的多端口旋风器(14,17; 52,63) 物质来自气相反应产物。 反应空间包括在两个同心位置的圆柱形和/或圆锥形包络表面之间形成的壳体上升空间(13; 50)。 颗粒物质与气相反应产物的分离是通过装有百叶窗(14; 63)的多口旋风分离器进行的。
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