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1.
公开(公告)号:US5362448A
公开(公告)日:1994-11-08
申请号:US134694
申请日:1993-10-12
CPC分类号: C08G69/16 , B01J19/18 , B01J2219/00094 , B01J2219/00159 , B01J2219/00164 , B01J2219/182 , B01J2219/185
摘要: A continuous polymerization method for laurolactam which has three stages. A prepolymerization process include steps of preliminarily heating laurolactam with 1 to 10% weight of water added, thereafter continuously feeding and passing the laurolactam from the upper part of the lower part of the longitudinal-type polymerization reaction zone, arranging a temperature decreasing gradient of 10.degree. C. or more than the upper part to the lower part directions at a polymerization temperature of 250.degree. and 300.degree. C. in the polymerization zone, and polymerizing the laurolactam under vapor pressure up to a conversion rate of 99.5% or more. A intermediate process has a step of releasing pressure from the prepolymerization product from the prepolymerization process for conversion into an intermediate product at atmospheric pressure. A post polymerization process includes the steps of continuously feeding the intermediate product at atmospheric pressure from the intermediate process in the direction from one end of the lower end to the other lower end of the traverse-type polymerization zone, polymerizing the intermediate product with agitation and air discharge in the presence of inert gas under reduced pressure or atmospheric pressure to a final relative viscosity of .eta..sub..tau. of 1.9 to 3.3.
摘要翻译: 一种具有三个阶段的月桂内酰胺的连续聚合方法。 预聚合方法包括以下步骤:先加入添加了1-10重量%的水的月桂内酰胺,然后从纵向聚合反应区的下部的上部连续进料和使该十二内酰胺进行流通, 在聚合温度为250℃〜300℃的条件下,在聚合温度为250℃〜300℃的温度范围内,在蒸气压下聚合十二内酰胺,转化率达到99.5%以上。 中间方法具有从预聚合过程中释放预聚合产物的压力以在大气压下转化为中间产物的步骤。 后聚合方法包括以下步骤:在大气压下从中间工艺在从横向聚合区的下端的一端到另一下端的方向连续供给中间产物,在搅拌下聚合中间产物, 在惰性气体存在下,在减压或大气压下进行空气放电至η的最终相对粘度为1.9至3.3。
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公开(公告)号:US5283315A
公开(公告)日:1994-02-01
申请号:US929404
申请日:1992-08-14
CPC分类号: C08G69/16 , B01J19/18 , B01J2219/00094 , B01J2219/00159 , B01J2219/00164 , B01J2219/182 , B01J2219/185
摘要: A continuous polymerization method for laurolactam which has three stages. A prepolymerization process include steps of preliminarily heating laurolactam with 1 to 10% weight of water added, thereafter continuously feeding and passing the laurolactam from the upper part of the lower part of the longitudinal-type polymerization reaction zone, arranging a temperature decreasing gradient of 10.degree. C. or more than the upper part to the lower part directions at a polymerization temperature of 250.degree. and 300.degree. C. in the polymerization zone, and polymerizing the laurolactam under vapor pressure up to a conversion rate of 99.5% or more. A intermediate process has a step of releasing pressure from the prepolymerization product from the prepolymerization process for conversion into an intermediate product at atmospheric pressure. A post polymerization process includes the steps of continuously feeding the intermediate product at atmospheric pressure from the intermediate process in the direction from one end of the lower end to the other lower end of the traverse-type polymerization zone, polymerizing the intermediate product with agitation and air discharge in the presence of inert gas under reduced pressure or atmospheric pressure to a final relative viscosity of .eta..sub..zeta. of 1.9 to 3.3.
摘要翻译: 一种具有三个阶段的月桂内酰胺的连续聚合方法。 预聚合方法包括以下步骤:先加入添加了1-10重量%的水的月桂内酰胺,然后从纵向聚合反应区的下部的上部连续进料和使该十二内酰胺进行流通, 在聚合温度为250度和300℃的聚合温度下,在蒸气压下聚合该月桂内酰胺直到99.5%或更高的转化率。 中间方法具有从预聚合过程中释放预聚合产物的压力以在大气压下转化为中间产物的步骤。 后聚合方法包括以下步骤:在大气压下从中间工艺在从横向聚合区的下端的一端到另一下端的方向连续供给中间产物,在搅拌下聚合中间产物, 在惰性气体存在下,在减压或大气压下进行空气放电至(η)(ζ)的最终相对粘度为1.9至3.3。
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