Problems with medium and low-temperature coal tar
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For the partial utilization of different coal grades, moving-bed gasification and carbonization produce medium- and low-temperature coal tar (which is further divided into those with a density greater than that of water and those with a density less than that of water), mixed benzene (naphtha), crude phenol, etc. Are there any materials available that provide information on these by-products, including their properties and uses? Thank you
Go through a feasibility study on coking or the deep processing of coal tar to see if there is any relevant information
This post was last edited by shuker666 on 2019-6-28 at 12:19. Coal carbonization is one of the important processes in coal chemical industry. It refers to the process in which coal is heated and decomposed in an air-free environment, producing products such as coke (or semi-coke), coal tar, crude benzene, and gas; the dry distillation of coal is a chemical reaction. Based on the final heating temperature, it can be divided into three types: 900–1100°C corresponds to high-temperature dry distillation, that is, coking ； 700–900°C is medium-temperature dry distillation ； 500–600°C is considered low-temperature carbonization (see low-temperature carbonization of coal). Taking a fixed-bed reactor as an example: Since the temperature of the dry distillation layer falls within the range of medium to low-temperature dry distillation, the by-products produced in actual operation include heavy oil (the oil separated by the crude tar separator), medium oil (the oil from the oil separator), light oil or naphtha (the oil obtained through low-temperature methanol washing), and crude phenol (the product obtained from phenol-ammonia recovery) ； Use 1: Hydrogenation of coal tar and naphtha (or as a by-product for sale), to produce diesel blending oils and gasoline blending oils; the main issue is that the octane number is insufficient, which is why they are temporarily referred to as blending oils ； Crude phenol can be refined and then further processed ； Use 2: Can be used to manufacture carbon black ； For information on properties and such, just search on Baidu Baike – it’s very comprehensive.