Coal tar impurity removal method and coal tar impurity removal device

Abstract

The embodiment of the invention belongs to the field of coal tar impurity removal, and relates to a coal tar impurity removal method and a coal tar impurity removal device. The method comprises the following steps: fully stirring coal tar to be treated, so that moisture in the coal tar to be treated is fully mixed with the coal tar; heating the stirred coal tar to a medicine mixing temperature; mixing a pre-prepared liquid medicine with the heated coal tar at the medicine mixing temperature to obtain a coal tar and liquid medicine mixture; and then reacting, dehydrating and filtering. According to the technical scheme provided by the invention, the coal tar and the water are fully mixed, then the coal tar is heated to the medicine mixing temperature, the coal tar and the medicine liquid are mixed, then the coal tar mixed with the medicine liquid is heated, impurities are condensed at the reaction temperature, and then the pure coal tar is obtained through dehydration and filtration; and under the environment that moisture and coal tar are fully mixed, impurities are firstly condensed and then dehydrated and removed, and the impurity removal environment is stable and efficient.

Description

technical field [0001] The present application relates to the technical field of coal tar impurity removal, and more specifically, to a method and device for removing coal tar impurities. Background technique [0002] Coal tar is a black or brown viscous liquid obtained by placing coal in a carbonization furnace and undergoing carbonization at 450 to 800 degrees Celsius. Its density is 0.90 to 1.20 grams per cubic centimeter and the total metal content is 40 to 1 million 450, the water content is 1% to 6, the main component is a mixture of phenols, aromatic hydrocarbons and heterocyclic compounds, and also contains salt, metal, quinoline insolubles, water and other impurities. Coal tar is further processed through a hydrogenation unit for refining, cracking, fractionation, etc., and products such as diesel oil, naphtha, liquid hydrocarbons, dry gas, and sulfur can be obtained. Impurities in coal tar poison the hydrogenation catalyst and deactivate it, causing the pressure d...

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Problems solved by technology

[0003] The existing method is to take the method of adding dispersant, demulsifier, light oil, and then filtering through a sintered mesh precision filter and backflushing. Although this method can obtain purified coal tar with better quality, the process is complicated and the operation is difficult. Difficulty, high cost, and low production efficiency, it is difficult to meet the needs of large-scale continuous production

In addition, settling first, centrifuging, then diluting, extracting, and combining multiple extraction methods also have high costs and low production efficiency.

[0004] On this basis, a method for anhydrous desalination and demetallization of coal tar has been produced. This method uses organic flocculants to react with salts and metals to form clusters, and then filter to remove impurities. Although this method can be better The salt and metal in coal tar are removed, and the subsequent hydrogenation product is of good quality and high yield, but it does not disperse and evenly stir the water in the oil before the coal tar enters the pretreatment system, and the reaction temperature fluctuates greatly, which affects the coal tar. Implementation efficiency of impurity removal process

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