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    • 3. 发明授权
    • Continuous preparation of nylon with diamine recycling
    • 连续制备尼龙与二胺回收
    • US4537949A
    • 1985-08-27
    • US620563
    • 1984-06-14
    • Franz SchmidtGunter PipperJosef G. FlossFranz Zahradnik
    • Franz SchmidtGunter PipperJosef G. FlossFranz Zahradnik
    • C08G69/26C08G69/00C08G69/28C08L77/00
    • C08G69/28
    • Nylons are prepared by a continuous process in which, in an evaporator zone, an aqueous solution of a salt of a dicarboxylic acid of 6 to 18 carbon atoms and a diamine of 6 to 18 carbon atoms is heated to 250.degree.-300.degree. C. under superatmospheric pressure, with simultaneous vaporization of water and formation of a prepolymer, the prepolymer and the vapors are separated continuously, the vapors are rectified and the entrained diamines are recycled, and the prepolymer is fed to a polycondensation zone and subjected to polycondensation under superatmospheric pressure of from 1 to 10 bar and at from 250.degree. to 300.degree. C., wherein the aqueous salt solution is heated under superatmospheric pressure of from 1 to 10 bar during a residence time of less than 60 seconds, with the proviso that, on leaving the evaporator zone, the degree of conversion is not less than 93% and the water content of the prepolymer is not more than 7% by weight.
    • 尼龙通过连续方法制备,其中在蒸发器区中将6至18个碳原子的二羧酸盐和6至18个碳原子的二胺的水溶液加热至250-300℃。 在超大气压下,随着水的蒸发和预聚物的形成,预聚物和蒸气被连续分离,蒸气被精馏,夹带的二胺被再循环,并将预聚物进料到缩聚区,并在超大气压下进行缩聚 压力为1至10巴,在250至300℃,其中在低于60秒的停留时间内,盐水溶液在1至10巴的超大气压下加热,条件是在 离开蒸发区,转化度不低于93%,预聚物的含水量不超过7重量%。
    • 8. 发明授权
    • Drying and heating of polyamide granules
    • 干燥和加热聚酰胺颗粒
    • US5052123A
    • 1991-10-01
    • US547304
    • 1990-07-03
    • Klaus J. TischendorfManfred LiebscherFarid RizkFranz Zahradnik
    • Klaus J. TischendorfManfred LiebscherFarid RizkFranz Zahradnik
    • C08G69/46B29B13/06B29K77/00C08G69/00
    • B29B13/065
    • 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
    • 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℃。