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This project adopts the production method of combining thin film evaporation and distillation column under high vacuum condition to remove the heavy component waste oil into crude oil. In the gas phase oriented cracking column, the crude oil is cracked to produce diesel oil through a series of later refining, and qualified diesel products are produced to meet the use standards.
Rectification process
The equipment consists of pretreatment part, heat exchange part, atmospheric and vacuum part, high vacuum thin film distillation part and vacuum system.
1. Product project
The plant product project is SN100 and SN250 the main products of the vacuum residue project are as follows:
SN100-----light base oil or diesel mix
SN250-----Medium base oil
Vacuum residue oil—wasterproof additive or cracking material（cracking for fuel oil）
Raw materials and products
1.Material properties
The raw material is waste oil provided by the customer.
The basic data is as follows:
| Item | Test value | Standard |
| appearance | Dark black | Visual inspection |
| smell | Gasoline, diesel and burnt smell | Smelling method |
| Density（20℃）/kg*m-3 | 880.7 | GB/T 1884——92 |
| viscosity（40℃）/mm2*s-1 | 67.28 | GB/T 265——88 |
| viscosity（100℃）/mm2*s-1 | 14.23 | GB/T 265——88 |
| Acid value/mg*g-1 | 1.61 | GB/T 7304——83 |
| Residual carbon mass fraction/% | 1.76 | GB/T 268——87 |
| Ash mass fraction/% | 0.78 | GB/T 508——85 |
| Pour point/mg*g-1 | -24 | GB/T 3535——83 |
| Opening flash point/℃ | 192 | GB/T 3536——88 |
| Moisture mass fraction/% | 0.1 | GB/T 260——88 |
| Mechanical impurity mass fraction/% | 0.23 | GB/T 511——88 |
| Sulphur content/mg*kg-1 | 4040 | GB/T 387——90 |
| Nitrogen content/mg*kg-1 | 1692 | GB/T 9170——88 |
| Pentane insoluble mass fraction | 14.1 | Gb/T8926A |
Waste oil composition：
| Saturated hydrocarbon/% | Mononuclear aromatics/% | Bicyclic aromatic hydrocarbon /% | Polycyclic aromatic hydrocarbons - polar compounds/% |
| 75-79 | 13 | 3.5 | 6.5 |
Saturated hydrocarbon classification：
| alkane/% | cycloalkane | |||
| 1 cycle/% | 2 cycle/% | 3 cycle/% | 4 cycle/% | |
| 27 | 27 | 18.5 | 12 | 15 |
The physical composition of waste lubricating oil is complex, and it has the properties of high temperature coking and heat sensitivity.
2. Product and by-product summary
The main products of this project are base oil, and the product results are as follows:
Product distribution：
| Item | Yield |
| Non-condeansable gas | 2% |
| SN100 | 25% |
| SN250 | 50% |
| Residual oil | 21%（cracking material） |
| moisture | 2% |
Residual oil cracking product：
| Item | Yield |
| Fuel oil | 30% |
| Base oil material | 45% |
| residue | 20% |
| Non-condensable gas | 5% |
Process route selection
high temperature conditions, so the operating temperature is not too high. Secondly, the waste oil contains a large number of additives, complex physical properties, at high temperature, the waste oil is more likely to produce a variety of polymerization reactions, generate a variety of polymers, resulting in equipment blockage. Thin film evaporation and fractionating column, under high vacuum operating conditions, the heating mode in the production process is mild, reduce the coking caused by temperature problems, improve the safety and operability of the device. Therefore, in the process selection, the process of high vacuum film evaporator + rectifying tower is adopted.
Advantage：
1.High vacuum condition reduces evaporation temperature and coking amount.
2.The use of thin film evaporator reduces the residence time, increases the mass transfer efficiency, avoids coking and blockage caused by component gasification, increases the times of stops, and affects the production efficiency.
3.The use of rectification tower can separate the non-ideal components and improve the color of base oil.
The new adopt technologies mainly include：
The use of high-performance tray (high throughput + high efficiency, rather than a single high efficiency) advanced equipment technology.
Full packing pressure relief tower technology (including high efficiency packing and high efficiency low pressure drop liquid distributor liquid collector and other internal parts)
The technology of centralized recovery of flue gas waste heat is adopted.
The anticorrosion technology combining process anticorrosion and equipment anticorrosion is adopted (considering acid value 0.5-1.0mgKoh /g).
Adopt frequency control technology.
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Wanrong Environmental Protection Technology Co., Ltd, is occupied in Petroleum refining, Pro-Environment, Chemical Technical Application, Technical Research and Development of the Project. Project design Equipment manufacturing and sales.
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