分步結(jié)品法的原理工業(yè)蔡分步結(jié)品法分離精制的理論是依據(jù)物系的液一固相平衡.蒸餾法生產(chǎn)的工業(yè)萘中主要雜質(zhì)是硫雜茚、酚類、破性含氮化合物及中性油類，雜質(zhì)量約占總量的5%。由萘與其它焦油組分所構(gòu)成的混和體系相圖可知，萘與芳烴及

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、堿性芳香化合物組成的體系形成簡(jiǎn)單的低共熔體，而且晏低共煊點(diǎn)都出現(xiàn)在茶的低濃度區(qū)。理論上這些雜質(zhì)經(jīng)過一次

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

審結(jié)品就可以除去，特殊的是茶與硫茚所形成的復(fù)雜體系，兩者不但能形成共熔體，而目在茚的高濃度區(qū)形成固熔體。分析萘與疏的兩相平衡圖，理論上只要經(jīng)過若干平衡樣級(jí)的處理便可達(dá)到需要的分離效果(，由于在接近狹窄區(qū)域尖端，每一級(jí)的分離效率越來越低。所以在實(shí)際生產(chǎn)中，需要確定恰當(dāng)?shù)姆蛛x級(jí)數(shù)和廣品需要達(dá)到的蔡純度指標(biāo)。通過控制一定的溫度條件。

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.

使工業(yè)蔡處在兩相區(qū)內(nèi)，物系中的各組分將在共存的兩相中重新分布。各組分在兩相中的濃度取決于該組分的分配系數(shù)K:實(shí)驗(yàn)測(cè)定，在相圇的

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

高濃度區(qū)，酚類、毗吮類和中性油類的分配系數(shù)K都近似等于零，所以，這些雜質(zhì)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.

對(duì)于硫茚，分配系數(shù)K值約為，說硫茚在平衡兩相中固相比液相有較低的含量，這樣，分離掉液相物就可以得到純度高于原工業(yè)茶的固相物。分離后得到的固相結(jié)晶再次融熔，井控制部分結(jié)品，又一次分離液相物后，就會(huì)得到比前一次蔡純度更高的固相結(jié)晶。如此重復(fù)上述熔恕一部分結(jié)晶一分出液相物的過程，就能得到萘純度一次比一次更高的結(jié)晶，直到達(dá)到我們需要的指標(biāo)。由工業(yè)萘生產(chǎn)精萘一般要經(jīng)過5次重復(fù)結(jié)品過程。

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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