萘是煤焦油中重要和含量高的组分。萘的分离精制在焦油加工中占有较大的份额。而硫茚是一种相当稳定的有机硫化合物，即使在萘沸腾的温度下，使用熔融碱为脱硫剂也不能从萘中清除。因此，萘-硫茚的分离难度较大。焦化厂和煤气厂的终冷塔聚集的萘渣，主要成分为萘和硫茚。常规精馏法分离萘和硫茚的缺点在于采用较多的塔板数也不易获得较高纯度的萘。而溶剂精馏法工艺，虽然塔板数较少，且萘的纯度可以明显提高，但操作仍在高温下进行，工艺流程长，能耗大。本课题采用CO2气体反溶剂法从萘渣中制备精萘。其主要优点在于：工艺简单、操作温度低（常温）。选择合适的溶剂很容易使萘的纯度达到98%以上。二次结晶后可实现进一步纯化，获得纯度99%的高纯萘。CO2气体和有机溶剂均可以回收利用。节能效果显着。

Naphthalene is an important and high content component in coal tar. The separation and refining of naphthalene holds a significant share in tar processing. And sulfur indene is a relatively stable organic sulfur compound, even at the boiling temperature of naphthalene, it cannot be removed from naphthalene using molten alkali as a desulfurizer. Therefore, the separation of naphthalene thioindene is difficult. The naphthalene residue accumulated in the final cooling towers of coking plants and gas plants is mainly composed of naphthalene and thionines. The disadvantage of conventional distillation method for separating naphthalene and thionines is that it is difficult to obtain high-purity naphthalene by using a large number of trays. The solvent distillation process, although having fewer trays and significantly improving the purity of naphthalene, still operates at high temperatures, resulting in a long process flow and high energy consumption. This project uses CO2 gas anti solvent method to prepare refined naphthalene from naphthalene residue. Its main advantages are: simple process, low operating temperature (room temperature). Choosing a suitable solvent can easily achieve a purity of over 98% for naphthalene. After secondary crystallization, further purification can be achieved to obtain high-purity naphthalene with a purity of 99%. CO2 gas and organic solvents can be recycled and reused. The energy-saving effect is significant.

应用范围、生产条件

Application scope and production conditions

萘在工业上是制造某些氢化萘、染料、合成树脂、制药和溶剂等的主要原料。也广泛用作消毒剂、杀虫剂及防腐剂等。

Naphthalene is the main raw material for manufacturing certain hydrogenated naphthalene, dyes, synthetic resins, pharmaceuticals, and solvents in industry. It is also widely used as a disinfectant, insecticide, and preservative.

采用本工艺生产高纯萘需要一台不锈钢沉淀槽。

The production of high-purity naphthalene using this process requires a stainless steel precipitation tank.

规模与投资、成本估算

Scale and investment, cost estimation

需要根据用户实际生产条件而定。

It needs to be determined based on the actual production conditions of the user.

由于流程简单、操作温度低，所以同以往生产工艺相比，本方法更经济。

Due to its simple process and low operating temperature, this method is more economical compared to previous production processes.

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