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  • 结晶技术

    结晶是一个重要的化工过程,是物质提纯的主要手段之一。众多化工、医药产品及中间产品都是以晶体形态出现的,结晶往往是大规模生产它们的最好又最经济的方法。结晶过程是一个复杂的传热、传质过程。在溶液和晶体并存的悬浮液中,溶液中的溶质分子向晶体转移(结晶),同时晶体的分子也在向溶液扩散(溶解)。 [查看全文]
  • 蒸发器的服务范围

    产品在蒸发过程中的行为取决于其本身的特性。蒸发装置的操作条件和过程参数是取决于蒸发热,比热,在不同压力下的沸腾曲线和流动行为。以及其他性质,入结垢的倾向,对温度的敏感性和盐沉淀等因素。 [查看全文]
  • 蒸发器管道吹扫和清洗的目的和方法

    化工装置开工前,需对其安装检验合格后的全部工艺管道和设备进行吹扫与清洗(以下统称吹洗),它的目的是通过使用空气、蒸汽、水及有关化学溶液等流体介质的吹扫、冲洗、物理和化学反应等手段,清除施工安装过程中残留在其间和附于其内壁的泥砂杂物、油脂、焊渣和锈蚀物等 [查看全文]
  • 涂料

    Over the course of the history of “paint” (as with joint compounds), there have been thousands of producers of paint and even more formulations, each with several dozens of ingredients. Original paint formulations were based on readily available, natural plant-based oils, one or more organic solvent, emulsifiers, pigments and driers. Today most paint is “latex” or more accurately, water-based rather than oil-based, and the amount of VOCs (volatile organic content) has been drastically reduced for environmental reasons. While oil based paints have not completely gone away,now both attapulgite and silica to the oil base paint market, water based paints & coatings dominate all major architectural coatings markets. [查看全文]
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