(1) During the operation of the distillation tower, the temperature should be controlled at 199-201C to keep the naphthalene content in the phenol oil extracted from the top of the tower at 26% - 30%. If the tower top temperature is too low, the tea content in the phenol oil can be reduced to less than 26%, which may lead to unqualified industrial Cai; If the tower top temperature is too high. The content of naphthalene in phenol oil will probably increase, which may reduce the output of industrial naphthalene. The tower top temperature can be adjusted by the return flow of phenol oil.
(2)在精馏塔操作中，应将塔底温度控制在270- 273"C,使塔底温度采出的洗油中的萘含量保持在3%- -8%。若塔底温度过低，则洗油含茶量大幅上升;若塔底温度过高则工业茶质量也会不合格，塔底温度可用控制循环油槽的液面高度来进行调节。
(2) During the operation of the distillation tower, the tower bottom temperature should be controlled at 270 - 273 "C to keep the naphthalene content in the wash oil extracted from the tower bottom temperature at 3% - 8%. If the tower bottom temperature is too low, the tea content in the wash oil will increase significantly; if the tower bottom temperature is too high, the quality of industrial tea will also be unqualified. The tower bottom temperature can be adjusted by controlling the liquid level of the circulating oil tank.
(3) During the production of light tower, because the three products of phenol oil, industrial naphthalene and wash oil are continuously extracted at the same time, they are extracted according to the proportion of each product in the raw material composition to stabilize the production and maintain the stability of naphthalene tower operation and high naphthalene refining rate.
(4) Under the stable state of the distillation tower, the temperature fluctuation range at the tower top, bottom and side line is small, and the temperature from the tower bottom to the 70th floor of the tower top float valve tray drops to 75-78C. Since the temperature of each tray will be about 1C on average, the temperature fluctuation at the bottom or top of the tower will affect the temperature gradient of the whole tower. Therefore, when adjusting a single factor in operation, the influence of the whole tower temperature should be considered, instead of one-way large adjustment, careful adjustment should be made and the changes of the whole tower should be carefully observed.
The characteristic of this T: process flow is to use naphtha or mixed distillate as raw material, and carry out rectification in the equipment system of the distillation tower equipped with a tubular furnace
Phenolic oil, industrial naphthalene containing more than 95% naphthalene and low naphthalene wash oil are cut from the tower. Compared with double-furnace and double-tower process, it simplifies the process and reduces labor consumption,
The equipment is reduced, but the operation stability is slightly poor, and the operation control is difficult.
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