MwB降膜结晶法精萘装置的工艺及生产，第一阶段，精萘生产工艺沿用前苏联技术，即由焦油蒸馏所得的萘油馏分生产压榨茶，萘饼熔化后经酸洗净化和简单蒸馏得产品精萘。由于该工艺存在生产wik]环境[wikj恶劣、洗涤需消耗大量酸碱且有外排废液、煤气直接加热蒸馏釜。

The process and production of MwB falling-film crystallization naphthalene refining unit. In the first stage, the production process of refined naphthalene follows the former Soviet Union technology, that is, the naphthalene oil fraction obtained from tar distillation is used to produce pressed tea, and the naphthalene cake is melted and purified by acid washing and simple distillation to obtain the product refined naphthalene. Due to the production wik] environment [wikj] of the process, a large amount of acid and alkali need to be consumed for washing, and there is waste liquid discharged and gas directly heating the distillation kettle.

装置热效率低且不安全以及压榨wikj设备[/wikj]的备品备件奇缺，难以长期维持稳定生产等原因，于1 989年停产，并转产工业萘第二阶段从1989年至1994年，采用双炉双塔工艺，以萘洗混合馏分为原料生产工业萘，不仅较好地解决了，上述问题，还极大地改善

Due to the low and unsafe thermal efficiency of the unit and the scarcity of spare parts for the press wikj equipment [/wikj], which is difficult to maintain stable production for a long time, the production was stopped in 1989 and converted to industrial naphthalene in the second stage from 1989 to 1994. The production of industrial naphthalene with naphthalene washing mixed fraction as raw material was carried out by the two-furnace two-tower process, which not only solved the above problems, but also greatly improved

操作环境。1992 年以来为第三阶段，为提高萘产品附加值，我们于19正式签约，引进该公司年产2万吨精萘的MWB降膜结晶法精萘装置，并于1994年12月投产，生产出了合格的精萘产品，各项技术经济指标均达到预期目标，从而使我厂的精萘生产技术进入了崭新的阶段.

Operating environment. Since 1992, it has been the third stage. In order to increase the added value of naphthalene products, we formally signed a contract on 19 to introduce the company's MWB falling-film crystallization naphthalene refining unit with an annual output of 20000 tons of refined naphthalene, and put it into operation in December 1994, producing qualified refined naphthalene products, and all technical and economic indicators have reached the expected goals, thus bringing our refined naphthalene production technology into a new stage

萘是一种重要的有机化工原料，主要用于催化氧化制苯酐和中间染料的制备,此外也用于水泥减水剂、偶氮染料、表面活性剂和分散剂,同时在增塑剂、树脂、合成纤维、药物和各种新型化学试剂领域也有应用。工业茶产品的质量分数在95%左右,如果直接以工业萘作为原料进行有机合成,会对下游产品的质量、生产定额的消耗和装置运行的稳定性产生一定影响,难以有效实现工业萘的价值"，为满足精细化工产业对蔡的质量要求，必须寻找一种高效可行的精制方法对工业萘进行提纯。

Naphthalene is an important organic chemical raw material, which is mainly used for the preparation of phthalic anhydride and intermediate dyes by catalytic oxidation. It is also used as cement water-reducing agent, azo dyes, surfactant and dispersant. It is also used in plasticizers, resins, synthetic fibers, drugs and various new chemical test agents. The mass fraction of industrial tea products is about 95%. If industrial naphthalene is directly used as raw material for organic synthesis, it will have a certain impact on the quality of downstream products, consumption of production quota and stability of plant operation, and it is difficult to effectively realize the value of industrial naphthalene. "In order to meet the quality requirements of fine chemical industry for Cai, we must find an efficient and feasible refining method to purify industrial naphthalene.

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