Method for preparing adsorption material using modified coal-tar pitch
A technology of coal tar pitch and adsorption materials, applied in chemical instruments and methods, and other chemical processes, can solve the problems of many harmful components in the human body and application restrictions, and achieve the expansion of utilization channels, increase of input-output ratio, and reduction of production costs Effect
Active Publication Date: 2010-09-08
山西永东化工股份有限公司
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Problems solved by technology
Most of the existing coal tar pitches in China are medium-temperature pitches. Due to the unsaturated aromatic hydrocarbons contained in medium-temperature pitches, the aging process is faster than that of petroleum pitch under the effects of oxygen in the air, sunlight temperature, ultraviolet rays and precipitation, and the harmful components contained in them are harmful to human body. More than petroleum asphalt, so its application in urban construction such as high-grade highways is restricted
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[0016] Take 1000g of medium temperature asphalt with a softening point of 81°C, fill it with compressed air at a temperature of 395°C, pressure of 0.05MPa, and a volume ratio of 1:2 in a 10000ml reactor, and perform forced oxidation at a constant temperature for 6 hours. Test according to GB2294-1997. The softening point of the modified asphalt rises to 112℃ (the infrared spectrum analysis of the modified asphalt is shown in Figure 1); at the same time, the fluorene, pyrene, fluoranthene, etc. which are cracked and cooled from the upper part of the reactor are recovered and analyzed by GC-MS ( Among them, in addition to naphthalene, a, B methyl naphthalene, anthracene, phenanthrene, carbazole, the main components of fluorene (2.26%, pyrene 12.32%, fluoranthene 1.67%), finally take out the modified asphalt gum from the kettle and grind it into 100μm asphalt powder .
[0017] Take 1000g of modified asphalt with melting point of 110℃ and 500g of medium temperature asphalt with melti...
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Abstract
The invention provides a method for preparing an adsorption material from modified coal tar asphalt, and aims at lowering production cost. The method comprises that: after the coal tar is continuously fractionated, the medium-temperature asphalt on the bottom part of a second-segment evaporator is placed in a reaction kettle, by filled with compressed air, the medium-temperature asphalt is forcedto be oxidized for 3 to 6 hours to become the modified asphalt, and the softening point of the modified asphalt is rised to be 100 to 120 DEG C; the modified asphalt is cooled down and ground into the modified asphalt powder with the size of between 50 and 100mu m; the unmodified medium-temperature asphalt is ground into powder to be used as a bonding agent, quaternary amination cation fulvic acid is added to be used as a chemical activation additive, and silanization fulvic acid is added to be used as a thinning agent; at a temperature of between 75 and 90 DEG C, the modified asphalt powder is subjected to strip-extrusion by an extrusion pelletizer, cutting, rounding and granulation; the obtain particle is sent to a carbonized oven, filled with nitrogen gas for protection and subjected to infusible carbonization through three phases, and filled with vapor for activation for 5 hours when the final temperature reaches 900 DEG C; and after reaction, the heating stops, the nitrogen gas is continuously filled until the sample is cooled down to the room temperature, and the formed asphalt active carbon is taken out.
Description
Technical field [0001] The invention relates to a method for preparing an adsorption material by using modified asphalt. technical background [0002] The application range of adsorption materials is very wide. The current preparation methods of activated carbon adsorption materials are mainly physical activation methods and chemical activation methods. The physical activation method uses the carbon and CO2, H2O and other gas activators in the modified asphalt to produce adsorption materials with high porosity such as micropores and mesopores. For chemical activation, KOH, ZnCl2 or H2PO4 is generally added to react with the modified asphalt to form structural compounds occupying space, and then through the digestion reaction (elution) to form pores, presenting a large surface area adsorption material. The production costs of these two preparation methods are relatively high. The coal pitch is the residue after the distillation of coal tar to extract light oil, phenol oil, napht...
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IPC IPC(8): B01J20/20B01J20/30
Inventor 刘福太刘东良刘东杰张巍周霞萍陈建青刘东玉肖文东
Owner 山西永东化工股份有限公司