Method for removing impurities from coal tar heavy oil
A technology for coal tar and heavy oil, which is applied in the direction of only multi-stage serial refining process, etc., can solve the problems of large equipment size, non-continuous operation, long cycle, etc., save the equipment area and equipment investment, and achieve good separation effect , the effect of reducing the loss of effective components
Inactive Publication Date: 2010-12-29
CHANGLING PETRO CHEM ENG DESIGN
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Problems solved by technology
Although the separation effect of the extraction and static method is better, the static process has defects such as long cycle, large equipment size, and discontinuous operation, which make it difficult to adapt to the large-scale requirements of the device.
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[0022] The feed is coal tar heavy oil with extraction agent, the flow rate is 20t / hr, the pressure is 0.2MPa(G), and the temperature is 80°C. It is sent to the buffer tank by the system, and the pressure is raised to 0.6MPa(G) by the booster pump. Sent to the filter to remove solid impurities above 500μm and prevent larger mechanical impurities from damaging the disc centrifuge; the filtered coal tar heavy oil is sent to the disc centrifuge for separation, the centrifuge speed is 5400rpm, and the light and heavy phases are sent separately Enter the light phase tank and heavy phase tank, of which the light phase is 28t / hr, and the density is 887kg / m 3 , heavy phase 2t / hr, density 986kg / m 3 .
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Abstract
The invention relates to a method for removing impurities from coal tar heavy oil, which comprises the following steps of: injecting coal tar heavy oil or coal tar heavy oil added with an extracting agent into a feeding booster system consisting of a buffer tank and a booster pump; removing solid particles with the grain diameter larger than 100 to 500 micrometers from oil by using a filter; and conveying the filtered oil to a disk type centrifuge to separate a heavy phase from a light phase, wherein the feeding pressure is lower than 0.3 to 0.6 MPa (G), a centrifugal separation system comprises the feeding booster system; and the density difference of the heavy phase and the light phase is more than 0.02g / cm<3>. The method has the advantages that the separation effect is good, and the separation of the heavy phase and the light phase which have the density difference of more than 0,02 to 0.05 g / cm<3> can be realized; the loss of active ingredients in the coal tar heavy oil is reduced; continuous operation can be realized, and the maximum treatment capacity of a single system can reach 3,500 and 5,000 L / hour; and compared with the extraction and standing process, the method has the advantages of greatly saving the floor area of the device and equipment investment.
Description
technical field [0001] The invention relates to coal tar heavy oil separation technology in petrochemical and coal chemical industries. Specifically, it refers to the direct impurity removal of coal tar heavy oil obtained from coal tar distillation unit and the impurity removal method after adding extractant. Background technique [0002] In the petrochemical and coal chemical industries, the importance of coal tar hydrogenation units is increasing day by day, and the coal tar hydrogenation technology has transitioned from the original distillate hydrogenation to the whole distillate hydrogenation. However, the coal tar heavy oil obtained by the coal tar distillation unit is not suitable as a raw material for coal tar hydrogenation due to its high content of residual carbon, metal ions, colloidal asphaltenes and mechanical impurities. After the above impurities are completely or partially removed, Only then can it enter the coal tar hydrogenation unit. The current methods ...
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IPC IPC(8): C10G53/02
Inventor 王萌李代玉杨培志李根忠黎大鹏
Owner CHANGLING PETRO CHEM ENG DESIGN
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