Deep processing of anthracene oil in tar processing

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Feasibility Study on the Construction of a Plant for Producing Crude anthracene with an Annual Processing Capacity of 24,000 tons I. Analysis of the Need for Construction Crude anthracene is an important chemical raw material, primarily used in the production of anthraquinone-based dyes and various paints. It is found mainly in the anthracene-rich fraction obtained from tar, accounting for about 5-10% of that fraction; the anthracene-rich fraction, in turn, constitutes around 16% of tar. At present, the vast majority of anthracene oil is used directly as fuel oil for combustion in tubular furnaces, or mixed with asphalt to produce carbon black oil for carbon black manufacturing; it is a great pity that the high-value product, anthracene white, is burned away. If we extract the crude anthracene from anthracene oil, it not only yields significant economic benefits, but the anthracene oil free of crude anthracene also does not tend to clog the burners when used for combustion in tubular furnaces. When used to formulate fuel oil with asphalt, it can reduce its viscosity without affecting the quality of the final product. Therefore, it is highly economical to build a plant with an annual processing capacity of 24,000 tons of anthracene oil to produce 2,000 tons of crude anthracene. II. Feasibility analysis of the construction: The plant for processing 24,000 tons of anthracene oil per year occupies an area of approximately 360㎡ (24m×15m). It includes one frame measuring 6m×12m (with a height of 7m on two floors), one intermediate tank for decrystallized anthracene oil with a capacity of 20 M3, two intermediate tanks for anthracene oil with a capacity of 45 M3 each, and one circulating cooling water tank. 1. Supporting facilities: The anthracene oil storage tank and the decrystallized anthracene oil storage tank can make use of the two 900 M3 fuel oil tanks in the finished products storage area; in addition, the 600 M3 naphthylmethane oil tank can also be utilized. Steam, water, and electricity can all be supplied directly from the finished products storage area. 2. In terms of environmental protection, the oil-based materials used in this device are non-volatile, and the operating temperature is below 100°C; as a result, no toxic gases are released into the air and cause pollution. Additionally, the device’s cooling system uses indirect cooling, with the cooling water being recycled, so there is no wastewater discharged, and thus no environmental contamination occurs. 3. Safety: All operating systems operate at atmospheric pressure with open systems, using steam for heating; there are no sources of fire, so no dangerous incidents such as fires or explosions can occur. Even if the human body comes into contact with oil, it will not cause harm. 4. Process Technology: This process utilizes the mature crystallization–centrifugation method. Anthracene oil is heated to 80–90°C and then pumped into a crystallizer; stirring is initiated, and the mixture is cooled with water to 38–42°C before being fed into a centrifuge for liquid removal. The residue resulting from this process is crude anthracene. This process is simple and easy to operate, and has been widely applied in various tar processing industries. III. Project Investment and Economic Benefit Analysis 1. The project investment is approximately 700,000 yuan, broken down as follows: three intermediate tanks – 100,000 yuan; four crystallizers (with stirrers) – 100,000 yuan; two centrifuges – 50,000 yuan; two oil pumps – 20,000 yuan; two water pumps – 10,000 yuan; civil engineering works – 300,000 yuan; process pipelines – 20,000 yuan; equipment installation – 50,000 yuan; instruments, electrical equipment, cables, etc. – 50,000 yuan. 2. Economic benefit analysis: With a processing capacity of 150,000 tons of tar per year, 24,000 tons of aniline oil can be produced annually, and 1,440 tons of crude aniline can be extracted (based on a yield of 6%). At current market prices of 2,500 yuan per ton for aniline oil and 3,800 yuan per ton for crude aniline, the annual gross profit can reach 1,872,000 yuan. If devitrified anthracene oil is used as fuel for tube furnaces, its price will be 50–100 yuan higher than that of ordinary anthracene oil, amounting to 1.178–2.256 million yuan. Power consumption: Electricity: 4 mixers with a capacity of 2.2 Kw, operating for 20 hours per day; 2 centrifuges with a capacity of 5.5 Kw, operating for 10 hours per day; 2 oil pumps with a capacity of 5.5 Kw, operating for 12 hours per day. The annual electricity cost is 76,000 yuan (at a rate of 0.65 yuan per kWh). Steam: The temperature of the anthracene oil after distillation can be maintained above 90°C, so no additional heating is required at the stage of processing crude anthracene. Steam is used only for purging the pipelines at the end of the processing process, and the amount used is very small; the annual cost for steam is estimated at 20,000 yuan. Water: Recycled, with almost no consumption.