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工业萘分步结晶法要注意什么问题?

来源:http://www.jnjdbc.cn/ 日期:2023-11-21 发布人:创始人

分步结品法的原理工业蔡分步结品法分离精制的理论是依据物系的液一固相平衡.蒸馏法生产的工业萘中主要杂质是硫杂茚、酚类、破性含氮化合物及中性油类,杂质量约占总量的5%。由萘与其它焦油组分所构成的混和体系相图可知,萘与芳烃及

The principle of the step-by-step product separation and refining method for industrial naphthalene is based on the liquid-solid phase equilibrium of the material system. The main impurities in the industrial naphthalene produced by distillation are thionines, phenols, broken nitrogen-containing compounds, and neutral oils, with impurities accounting for about 5% of the total amount. The phase diagram of the mixed system composed of naphthalene and other tar components shows that naphthalene, aromatics, and

酸、碱性芳香化合物组成的体系形成简单的低共熔体,而且晏低共煊点都出现在茶的低浓度区。理论上这些杂质经过一次

The system composed of acidic and alkaline aromatic compounds forms simple low eutectic melts, and the low eutectic points all appear in the low concentration zone of tea. In theory, these impurities undergo a single pass

20230315080441285.jpg

审结品就可以除去,特殊的是茶与硫茚所形成的复杂体系,两者不但能形成共熔体,而目在茚的高浓度区形成固熔体。分析萘与疏的两相平衡图,理论上只要经过若干平衡样级的处理便可达到需要的分离效果(,由于在接近狭窄区域尖端,每一级的分离效率越来越低。所以在实际生产中,需要确定恰当的分离级数和广品需要达到的蔡纯度指标。通过控制一定的温度条件。

The final product can be removed, especially the complex system formed by tea and sulfhydrin. The two can not only form a co melt, but also form a solid melt in the high concentration zone of sulfhydrin. Analyzing the two-phase equilibrium diagram of naphthalene and methanol, theoretically, the required separation effect can be achieved by processing several equilibrium sample stages. However, due to the decreasing separation efficiency of each stage near the narrow region tip, in actual production, it is necessary to determine the appropriate number of separation stages and the purity index that the product needs to achieve. By controlling certain temperature conditions.

使工业蔡处在两相区内,物系中的各组分将在共存的两相中重新分布。各组分在两相中的浓度取决于该组分的分配系数K:实验测定,在相囵的

Place the industrial Cai in the two-phase zone, and the components in the system will be redistributed in the coexisting two phases. The concentration of each component in the two phases depends on the distribution coefficient K of the component: experimental measurement, in the phase

高浓度区,酚类、毗吮类和中性油类的分配系数K都近似等于零,所以,这些杂质基本都保留在液相中。

In the high concentration zone, the distribution coefficients K of phenols, pipettes, and neutral oils are all approximately zero, so these impurities are basically retained in the liquid phase.

对于硫茚,分配系数K值约为,说硫茚在平衡两相中固相比液相有较低的含量,这样,分离掉液相物就可以得到纯度高于原工业茶的固相物。分离后得到的固相结晶再次融熔,井控制部分结品,又一次分离液相物后,就会得到比前一次蔡纯度更高的固相结晶。如此重复上述熔恕一部分结晶一分出液相物的过程,就能得到萘纯度一次比一次更高的结晶,直到达到我们需要的指标。由工业萘生产精萘一般要经过5次重复结品过程。

For thionines, the distribution coefficient K value is approximately, indicating that thionines have a lower content in the solid phase compared to the liquid phase in the equilibrium phase. Therefore, by separating the liquid phase, a solid phase with higher purity than the original industrial tea can be obtained. The solid phase crystals obtained after separation are melted again, and some of the products are controlled. After separating the liquid phase again, a higher purity solid phase crystal will be obtained than the previous one. By repeating the process of melting a portion of the crystals and separating the liquid phase, we can obtain crystals with higher purity of naphthalene each time, until we meet the required indicators. The production of refined naphthalene from industrial naphthalene generally requires 5 repeated product processes.

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This article is a friendly contribution from a refined naphthalene manufacturer. For more information, please click on: http://www.jnjdbc.cn Sincere attitude. We will provide you with comprehensive services. We will gradually contribute more relevant knowledge to everyone. Stay tuned

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