Novel process for eliminating quinoline insoluble substances in coal tar medium temperature pitch

Abstract

The invention discloses a novel process for eliminating quinoline insoluble substances in a coal tar medium temperature pitch. The invention comprises the following steps: using the coal tar pitch as raw material, mixing with a solvent according to a certain proportion, and continuous extracting and settling separation for the settling separation of the quinoline insoluble substances in the pitch to obtain a clarified liquid and sediments. The invention is characterized in that the coal tar pitch material uses the coal tar medium temperature pitch; the coal tar medium temperature pitch and a mixed solvent of an aromatic hydrocarbon solvent and an aliphatic hydrocarbon solvent according to a certain proportion are preheated and respectively sent to a multi-level static mixer for even mix according to a proportion of 1:0.8-1.2 by weight to produce a mixing oil; and the continuous extracting and settling separation is carried out for eliminating the quinoline insoluble substances in the coal tar medium temperature pitch. Since the technical proposal is used, the invention has low cost and high separation efficiency, and the refine pitch after clarifying fully satisfies the requirement of producing needle coke or as an impregnant pitch.

Description

technical field [0001] The invention relates to a coal tar pitch purification method, in particular to a new process for removing quinoline insoluble matter from coal tar medium temperature pitch. Background technique [0002] Coal tar medium-temperature pitch is used as raw material to prepare needle coke raw materials for ultra-high-power graphite electrodes, raw materials for impregnating agents and raw materials for special carbon products, and must be refined. The main task is to remove the primary quinoline insolubles in the pitch . Adopting a suitable refining method is the key to guarantee the quality of refined asphalt products. In the past, methods for removing quinoline-like insolubles of such fused-ring polymers include hydrogenation, hot filtration, high-temperature solvent extraction and solvent-centrifugation. The disadvantages of the above method are: 1. The hydrogenation method has complicated process and large investment, and is not suitable for large-sca...

AI Technical Summary

Problems solved by technology

The disadvantages of the above method are: 1. The hydrogenation method has complicated process and large investment, and is not suitable for large-scale production; 2. The hot-melt filtration method has strict requirements on the filter screen, requires pressurized treatment, and has high operating costs; 3. The centrifugal separation method Equipment operation costs are high, and the processing volume is small

The disadvantage of this process is: the coal tar soft asphalt is used as raw material, and the raw material of coal tar soft asphalt is mixed with about 20% anthracene oil fraction in medium temperature asphalt, the cost is high, and because the anthracene oil fraction does not contain quinoline insolubles Among them, the anthracene oil fraction also contains 8% of pigment intermediate products, which are easy to crystallize substances, and problems such as blockage of pipelines will occur during the transportation, mixing and distillation of anthracene oil fractions, which will increase the load of oil pumps and increase equipment handling. amount, increasing fuel consumption, which will increase the cost of raw materials

[0003] In addition, most of the mixing methods used in conventional production processes are container mechanical mixer mixing. The disadvantages of mechanical mixing are: long residence time, certain dead angle, and large power consumption

Images