Refined naphthalene is an important raw material in organic chemical industry. It is widely used in the production of synthetic fiber, rubber, resin, dyes and explosives. At present, except that a few coking plants produce refined naphthalene according to needs, most plants produce industrial naphthalene containing more than 95% of refined naphthalene. Industrial naphthalene is produced during coal coking. More than 90% of naphthalene exists in tar, and a small amount of naphthalene remains in the gas cooled by primary cooler.

焦油蒸馏所得的萘洗混合分或酚萘洗混合分经洗涤脱酚后的萘油即为生产工业萘的原料。工业精萘大都用精馏法生产，可分为间歇式和连续式两种方法，目前多采用单炉单塔，单炉双塔或双炉双塔生产工艺双炉双塔工业萘连续精馏工艺流程。

Naphthalene oil obtained from naphthalene washing mixture or Phenol Naphthalene washing mixture obtained by tar distillation after washing and dephenolization is the raw material for the production of industrial naphthalene. Industrial refined naphthalene is mostly produced by distillation, which can be divided into batch and continuous methods. At present, the production process of single furnace and single tower, single furnace and double tower or double furnace and double tower is mostly adopted, and the process flow of continuous distillation of industrial naphthalene with double furnace and double tower is adopted.

已洗萘洗混合分或已洗酚萘洗混合分于原料槽中加热到85～90℃，静止脱水后，由原料泵送至热交换器，与工业萘蒸汽换热到200℃左右，进入70层浮阀初馏塔，由初馏塔顶采出酚油，塔顶蒸汽温度控制在185℃左右。初馏塔底已脱除酚油的萘洗油用热油泵送往初馏管式炉加热至270℃左右再返回初馏塔底，以热油循环方式供给初馏塔热量。

The washed naphthalene washing mixed fraction or washed Phenol Naphthalene washing mixed fraction is heated to 85 ~ 90 ℃ in the raw material tank. After static dehydration, the raw material is pumped to the heat exchanger to exchange heat with the industrial naphthalene steam to about 200 ℃ and enter the 70 layer float valve primary distillation tower. The phenol oil is extracted from the top of the primary distillation tower, and the steam temperature at the top of the tower is controlled at about 185 ℃. Naphthalene wash oil with phenol oil removed from the bottom of the primary distillation tower is sent to the primary distillation tubular furnace with a hot oil pump for heating to about 270 ℃, and then returns to the bottom of the primary distillation tower to supply heat to the primary distillation tower in the form of hot oil circulation.

在初馏塔热油循环过程中，从热油泵出口管中分出一部分萘洗油打入70层浮阀精馏塔。工业萘从精馏塔顶采出，塔顶工业萘蒸汽温度控制在218℃左右。工业萘蒸汽在热交换器与原料换热后，进入汽化冷凝冷却器，被冷却到95～105℃后流入工业萘回流槽。

During the hot oil circulation of the primary distillation tower, a part of naphthalene washing oil is separated from the outlet pipe of the hot oil pump and pumped into the 70 layer float valve distillation tower. Industrial naphthalene is extracted from the top of the distillation tower, and the steam temperature of industrial naphthalene on the tower top is controlled at about 218 ℃. After exchanging heat with raw materials in the heat exchanger, the industrial naphthalene steam enters the vaporization condensing cooler, is cooled to 95 ~ 105 ℃ and then flows into the industrial naphthalene reflux tank.

一部分工业萘作为精馏塔回流以控制精馏塔顶蒸汽温度（与初馏塔顶类似），一部分经转鼓结晶机冷却结晶后得到工业萘片状结晶成品。精馏塔底由热油泵将残油送至精馏管式炉加热至300℃左右，打回精馏塔底，以热油循环方式供给精馏塔热量。从热油泵出口管分出一部分残油作为低萘洗油，经冷却器后进入低萘洗油槽。

Part of the industrial naphthalene is refluxed as the distillation tower to control the steam temperature at the top of the distillation tower (similar to that at the top of the primary distillation tower), and part is cooled and crystallized by the drum crystallizer to obtain the industrial naphthalene flake crystalline finished product. At the bottom of the distillation column, the residual oil is sent to the distillation tubular furnace by the hot oil pump, heated to about 300 ℃, returned to the bottom of the distillation column, and the heat of the distillation column is supplied by hot oil circulation. Part of the residual oil is separated from the outlet pipe of the hot oil pump as low naphthalene washing oil, which enters the low naphthalene washing oil tank after passing through the cooler.

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