Single furnace and double tower process flow:
The difference between single furnace and double tower process flow is that the radiation section of single furnace and double tower tube furnace is divided into two groups. The bottom oil of the primary distillation tower is fed into one group of convection section and radiation section of tubular furnace by hot oil pump for heating, and then returns to the evaporation section at the bottom of primary distillation tower for circulating heating. The bottom oil of rectifying tower is sent to another group of radiation section of tubular furnace by hot oil pump for heating, and then returns to evaporation section of rectifying tower for circulating heating. The other processes are completely the same as that of double furnace and double tower.
Because two towers are supplied by one heating furnace, when the temperature and composition of industrial naphthalene raw materials change, the heat supplied by the heating furnace to the two towers is not well balanced and the operation is difficult, so it is gradually replaced by the double furnace and double tower process.
Single furnace and single tower process flow:
In this process, a tubular furnace and a distillation column are used to extract the dephenolized oil from the top of the tower, cut the industrial naphthalene from the side line, and extract the tower bottom oil from the outlet of the hot oil circulating pump (different raw materials lead to different products at the bottom of the tower).
The washed naphthalene containing fraction is heated in the raw material storage tank and dehydrated in static state, and then sent to convection section of tubular furnace by feed pump, and then into industrial naphthalene distillation tower. The phenol oil vapor escaping from the tower top flows into the reflux tank after condensation cooling and oil-water separation. As a result, a part of the phenol oil is sent to the tower top for reflux, and the remaining part is produced as product. The tower bottom oil is pumped by hot oil circulation pump to the radiation section of the tubular heater for heating and returning to the bottom of the tower to supply heat to the distillation column. At the same time, a part of the hot oil pump is separated from the outlet of the hot oil pump to be produced as a product and then cooled into the product tank. The industrial naphthalene is extracted from the side line of the rectification section, condensed and cooled by the vaporization condenser, and then transferred to the industrial naphthalene product tank, and then transferred to the drum crystallizer for crystallization packaging.
Single furnace and single tower process is a new process developed on the basis of single furnace and double tower process. It has the advantages of simple process, simple operation and advanced technology. At present, some domestic factories adopt this process. The process of single furnace and single tower requires high naphthalene content in raw materials. It needs more theoretical plates to cut industrial naphthalene from side line. The naphthalene content of industrial naphthalene is relatively low, but it can also meet the requirement that the naphthalene content of industrial naphthalene is more than 95%.
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