Process for preparing high adsorbing active carbon by using petroleum coke as raw material

Abstract

A method for preparing activated carbon with high adsorption activity by using petroleum coke as a raw material comprises the following steps: pulverizing the petroleum coke raw material into 81-150 mesh powder, and degassing in a 220-350 DEG C vacuum dryer to obtain a product A with a certain initial pore space; preparing an alkaline medium solution with a molar concentration of 0.2-0.5N, addingthe product A into the alkaline medium solution, adding a cosolvent, mixing uniformly, and allowing carbonization and alkaline activation treatment at 700-800 DEG C under inert gas atmosphere for 1-3hours to obtain a product B; and cooling the product B, washing and drying to obtain the final product. The inventive method has the following advantages that: the activated carbon prepared by using the method has rich micro-pores and has BET specific surface area of 2,500-3,000m<2> / g; the petroleum coke has a certain initial pore space and can mix and sufficiently contact with the alkaline medium solution, so as to reduce the consumption of the alkaline medium, reduce cost, reduce pollution, and unify reaction; and the activation rate and the yield are high, and the product quality is stable.

Description

(1) Technical field [0001] The invention belongs to a method for preparing activated carbon, in particular to a method for preparing (high specific surface area) highly adsorbable activated carbon by using petroleum coke as a raw material. (2) Background technology [0002] As a commonly used adsorbent, activated carbon is indispensable in industrial production and daily life. Traditional activated carbon is generally prepared from coal or various woods or plant husks. Due to the high ash content of impurities in coal, the activated carbon has high ash content of impurities, low specific surface area and unsatisfactory adsorption effect, which cannot meet the needs of food, The needs of important fields such as medicine, advanced environmental protection, chemical industry, and military affairs; wood chips, fruit shells, coconut shells, etc. are limited by the nature of the body and the resources of the origin of the production of activated carbon, so it is urgent to develop...

AI Technical Summary

Problems solved by technology

U.S. Patent US5143889 uses mesophase pitch carbon microspheres as raw materials and uses potassium hydroxide (KOH) as an activator to obtain a specific surface area (BET) of 3000m 2 / g of activated carbon with ultra-high specific surface area, but because the mesophase pitch carbon microspheres are prepared by heat treatment of coal tar, the yield is only 10%, which greatly increases the cost of producing this activated carbon

Chinese patents CN93120925.0 and CN96123525.x both disclose a method for preparing activated carbon from pitch as a raw material. The activated carbon prepared by these methods has high specific surface area, good adsorption performance, low manufacturing cost, and low impurity ash content, etc. advantages, but its activation yield is still not ideal, and the high one is only about 25%.

In addition, there are also reports about using petroleum coke as a raw material to prepare activated carbon with an ultra-high specific surface area through chemical activation, but they are all directly mixed with alkaline solids, and the alkali-carbon ratio is as high as 10:1. Due to the high price of KOH (8000 yuan / ton), so the cost is too high and the pollution is serious