Method for preparing phenol compound and clean fuel oil from coal tar

Abstract

The invention relates to a method for preparing a phenol compound and a clean fuel oil from coal tar, and belongs to the fields of coal chemical industry and energy technology. The method is characterized by comprising the following steps of: separating the coal tar into a light oil and a tower-bottom heavy oil in the manner of catalyst distillation; performing delay coking on the tower-bottom heavy oil; mixing the tower-bottom heavy oil with the coal tar and distilling again; performing alkaline cleaning on the light oil and filtering, thereby obtaining an alkaline phenol salt and the phenol-removed light oil; steaming and blowing the neutral phenol salt in a steaming and blowing kettle, thereby obtaining the clean phenol salt; decomposing the clean phenol salt by using a dilute sulphuric acid, thereby obtaining crude phenol; or respectively treating the crude phenol and sodium carbonate in a decomposition tower by adopting the continuous CO2 decomposition process; injecting the phenol-removed light oil into a reactive distillation tower filled with a molecular sieve/alumina catalyst and performing reactive distillation; directly leading the distillate oil after the reactive distillation into a hydrogenation refining tower of a hydrogenation reactor; and performing the hydrogenation refining, thereby obtaining the clean fuel oil. The phenol compound and the clean fuel oil with high additional values are produced by utilizing the coal tar, thereby providing a new way for the resource utilization of the coal tar. In addition, the method provided by the invention is good in economic benefits and industrial application prospects.

Description

technical field [0001] The invention belongs to the fields of energy technology and environmental protection, and relates to a method for preparing phenolic compounds and clean fuel oil from coal tar. Background technique [0002] In the process of coal chemical industry, coal tar is one of the important products of coking industry, its output accounts for about 3%~4% of the furnace coal, its composition is extremely complex, and its annual output is about 15.00 Mt. According to the different coal carbonization temperature, it can be divided into high-temperature coal tar, medium-temperature coal tar and low-temperature coal tar. The composition and properties of the three are different, and their processing and utilization methods are different. At present, part of the high-temperature coal tar is used to extract chemical products, most of the medium / low temperature coal tar and a small amount of high-temperature coal tar are used as fuel for extensive combustion. Because ...

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Problems solved by technology

For the purpose of rational utilization of coal tar resources, there are many disadvantages in the coal tar process, such as high investment in high-pressure equipment, serious environmental pollution, low added value, low yield of gasoline and diesel, etc., through catalytic distillation, delayed coking, alkali washing Organically combined with hydrogenation and upgrading to realize the resource utilization of coal tar, and convert it into high value-added chemicals and gasoline and diesel that meet the requirements

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