Preparation method of porous carbon material

Abstract

The invention discloses a preparation method of a porous carbon material. The preparation method comprises the following steps of blending polyvinylidene chloride, polyvinyl chloride, basic metal oxide and a processing aid, carrying out extrusion molding, carrying out charing and carrying out carbon deposition to obtain the porous carbon material. The preparation method solves the problem that the prior art for preparing a porous carbon material structure only by polyvinylidene chloride produces unstable chlorine atoms, easily produces hole-closing phenomenon and difficultly controls apertures and a specific surface area so that porous carbon material performance and stability are influenced, and also solves the problem that based on the prior art, in a polyvinylidene chloride and polyvinyl chloride thermolysis dechlorination process, poisonous and harmful HCl gas is produced, process time is long and energy consumption is high. The preparation method has the advantages of simple processes, environmental friendliness, easy industrialization and stable product performances.

Description

technical field [0001] The invention relates to a method for preparing a porous carbon material, in particular to a method for preparing a porous carbon material by using polyvinylidene chloride and polyvinyl chloride as main raw materials. Background technique [0002] Porous carbon material is a new type of non-polar carbon adsorbent material developed in the 1960s. Porous carbon materials have uniform pore size distribution, high chemical stability and gas selectivity. At present, porous carbon materials have been widely used in environmental protection, chemical industry, petroleum industry, food processing, hydrometallurgy, pharmaceutical refining, military protection, etc. each field. [0003] There are a wide range of raw materials for preparing porous carbon materials, mainly including organic polymers (polyvinylidene chloride resin, phenolic resin, etc.), various coals and coal-based derivatives (lignite, bituminous coal, anthracite, etc.), biomass (wood, shell, b...

AI Technical Summary

Problems solved by technology

At present, the simple use of polyvinylidene chloride to prepare porous carbon materials has been disclosed in the 1970s, but when purely using polyvinylidene chloride to prepare porous carbon materials, because the prepared porous carbon materials contain more unreacted Chlorine atoms affect the thermal and chemical stability of porous carbon materials during use. At the same time, due to the low hardness of polyvinylidene chloride, it is easy to produce closed cells during the preparation of porous carbon materials. Difficult to control surface area, which affects the performance and stability of porous carbon materials

Moreover, HCl will be produced during the heating dechlorination process of polyvinylidene chloride, and the time required for the dechlorination process is longer, resulting in a long production cycle, and the thermal decomposition temperature is required to be as high as 1000 ° C, resulting in high energy consumption; while using microwave dechlorination method, although the required time is shortened, it is more difficult to mass-produce

In addition, during the preparation of porous carbon materials from polyvinylidene chloride, the HCl produced will inevitably corrode equipment and pollute the environment.