申请人:——
公开号:US20040102604A1
公开(公告)日:2004-05-27
The continuous process for preparing a polyamide by reacting at least one aminonitrile with water comprises:
(1) reacting at least one aminonitrile with water in the presence of an organic liquid diluent at from 90 to 400° C. and from 0.1 to 35×10
6
Pa in a flow tube containing a Brönsted acid catalyst selected from a beta-zeolite catalyst, a sheet-silicate catalyst or a titanium dioxide catalyst comprising from 70 to 100% by weight of anatase and from 0 to 30% by weight of rutile and in which up to 40% by weight of the titanium dioxide may be replaced by tungsten oxide, to obtain a reaction mixture,
(2) further reacting the reaction mixture at from 150 to 400° C. and a pressure which is lower than the pressure in stage 1 in the presence of a Brönsted acid catalyst selected from a beta-zeolite catalyst, a sheet-silicate catalyst or a titanium dioxide catalyst comprising from 70 to 100% by weight of anatase and from 0 to 30% by weight of rutile and in which up to 40% by weight of the titanium dioxide may be replaced by tungsten oxide, the temperature and pressure being selected so as to obtain a first gas phase and a first liquid phase or a first solid phase or a mixture of first solid and first liquid phases and so that the first gas phase is separated from the first liquid phase or first solid phase or from the mixture of first liquid and first solid phases, and
(3) admixing the first liquid or the first solid phase or the mixture of first liquid and first solid phases with a gaseous or liquid phase comprising water at from 150 to 370° C. and from 0.1 to 30×10
6
Pa, to obtain a product mixture.
通过至少一种氨基腈与水反应制备聚酰胺的连续工艺包括
(1) 在有机液体稀释剂存在下,至少一种氨基腈与水在 90 至 400 摄氏度和 0.1 至 35×10
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Pa的条件下,在装有勃朗斯特催化剂的流化管中进行反应,该催化剂选自β-沸石催化剂、片状硅酸盐催化剂或二氧化钛催化剂(其中锐钛矿的重量占70%至100%,金红石的重量占0%至30%,其中二氧化钛的重量占40%),可由氧化钨取代,以获得反应混合物、
(2) 将反应混合物在 150 至 400 摄氏度的温度下进一步反应。沸石催化剂、片状硅酸盐催化剂或二氧化钛催化剂(其中锐钛矿重量占 70%至 100%,金红石占 0%至 30%,二氧化钛中最多 40%的重量可由氧化钨取代)、选择温度和压力,以获得第一气相和第一液相或第一固相或第一固相和第一液相的混合物,并使第一气相从第一液相或第一固相或第一液相和第一固相的混合物中分离出来,以及
(3) 将第一液相或第一固相或第一液相和第一固相的混合物与包含水的气相或液相在 150 至 370 摄氏度和 0.1 至 30×10
6
Pa 的条件下,将第一种液体或第一种固相或第一种液体和第一种固相的混合物与包含水的气相或液相混合,以获得产品混合物。