ACETYLAYLATION TECHNOLOGYThe new pr

ACETYLAYLATION TECHNOLOGY
The new process can be broken down into four basic steps : addition of chemical, reaction, and stripping of surplus acetic anhydride and formed acetic acid in two stepsตฝ . Ameasured amount of preheated acetic anhydride is mixed with the dried wood fiber in continuous moving screw reactor at approximately 140 c with a residence time of 5 to 10 minutes. Aplug screw at the end of the reactor separates the reactor from the first stripping tower. The atmosphere moving the fibers through the first stripper consists of a mixture of anhydride and acetic acid vapors. The vapors are kept superheated by a steam-heated exchanger and the fibers are separated in cyclone before being discharged to the next stripping step. Superheated steam (water vapor) is used in the second stripping tower to convert un-reacted anhydride to acid. The dry fiber is then remove from the system and ready for adhesive application if the acetylate fiber is to be made into composite

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acetylaylation技术
新过程可以分解为四个基本步骤：化学反应，同时，剥离剩余醋酐和醋酸形成两步ตฝ。测量量的乙酸酐混合预热干燥的木材纤维在连续移动螺杆反应器约140 C，停留时间5到10分钟。一个螺丝在反应器脱离第一汽提塔反应结束。在第一个汽提器中，通过一个二酸酐和醋酸蒸汽的混合物，将其移动到大气中。蒸汽加热的热交换器使蒸汽保持过热，在下一步汽提步骤之前，在旋风分离器中分离出纤维。过热蒸汽（水蒸汽）用于二次汽提塔，将未反应的酸酐转化为酸。干纤维是从系统准备胶粘剂的应用如果乙酰纤维制成的复合材料去除