I. product introduction
The pore of coal-based activated carbon used for air purification is developed, which is used for the purification of chemical raw gas, chemical synthesis gas, carbon dioxide gas and hydrogen, nitrogen, hydrogen chloride inert gas used for pharmaceutical industry gas drinks, and the purification of atomic facilities. It is also used for the separation and purification of air pollutants and mixed gases.
Technical index: (executive standard GB / T 7701.5-1997)
Iodine value mg/g
Accumulation weight g/L
Activated carbon is a kind of porous carbonaceous material, which has a highly developed pore structure and is an excellent adsorbent. The adsorption area per gram of activated carbon is more than eight tennis fields. Its adsorption is achieved by physical adsorption and chemical adsorption. Its components include a small amount of hydrogen, nitrogen, oxygen and ash besides carbon elements, and its structure is Carbon is formed by the accumulation of six rings Due to the irregular arrangement of the six ring carbon, the microporous volume and high surface area of the activated carbon are characterized.
Activated carbon can be made of many kinds of carbonaceous materials, including wood, sawdust, coal, coke, peat, lignin, core, hard shell, sucrose pulp, bone, lignite, petroleum residue, etc. Among them, coal and coconut shell have become the most commonly used raw materials for the production of activated carbon. The production of activated carbon is basically divided into two processes. The first process includes dehydration and carbonization, heating the raw materials, drying at 170-600 ℃, and carbonizing about 80% of the original organic matter. The second process is to activate the carbonized products, which is completed by the reaction of activators such as water vapor and carbon. In the endothermic reaction, a mixture of CO and H2 is mainly produced, which is used to burn and heat the carbonized products to a proper temperature (800-1000 ℃), so as to burn all the decomposable materials, thus producing a developed microporous structure and a large specific surface area, so it is very strong Adsorption capacity.
The pores of activated carbon can be divided into three types according to the pore size Large hole: radius 1000 - 1000000 a Transition hole: radius 20 - 1000 a. Micropore: radius - 20 a.
Activated carbon made from different materials has different pore sizes. The activated carbon made from coconut shell has the smallest pore radius. Generally, wooden activated carbon has the largest pore radius, they are used to absorb larger molecules, and almost exclusively used in the liquid phase. The first type of granular activated carbon used in urban water treatment is made of wood, which is called charcoal. The pore size of coal based activated carbon is between them.
In coal based activated carbon, lignite activated carbon has more transition pores and larger average pore diameter than anthracite activated carbon, so it can effectively remove macromolecular organics in water.
Generally, the surface area of activated carbon used in water treatment is not necessarily too large, but it should have more transition pores and larger average pore diameter. Some liquid phase activated carbons sold on the Japanese market have the following characteristics: specific surface area of 850-1000m2 / g, pore volume of 0.88-1.5ml/g, average pore radius of 40-50a.
Brief introduction of activated carbon function:
Active carbon has the function of high efficiency air purification. Active carbon can create a comfortable and clean environment. Active carbon is more care for human health. Active carbon is an invisible air filter screen. Active carbon is a combination of physical adsorption and chemical decomposition. It can decompose harmful gases such as formaldehyde, ammonia, benzene, cigarettes, lampblack and various peculiar smells in the air, especially carcinogenic aromatic substances, active As a kind of commonly used adsorbent, catalyst or catalyst carrier, activated carbon is easy to fully contact with harmful gases in the air. Active carbon uses its own pore adsorption to suck harmful gas molecules into the pore and blow out fresh and clean air. So active carbon is indispensable for family partners.
Application of activated carbon
Activated carbon is widely used in all aspects of industrial and agricultural production, such as alkali free deodorization (refined mercaptan), ethylene desalted water (refined filler), catalyst carrier (palladium, platinum, rhodium, etc.), water purification and sewage treatment, water quality treatment and protection of power plants in the power industry, chemical catalyst and carrier, gas purification, solvent recovery and oil and grease removal in the chemical industry Color and refining; beverage, alcohol, monosodium glutamate mother liquor and food refining and decolorization in the food industry; gold extraction and tail liquor recovery in the gold industry; sewage treatment, waste gas and harmful gas treatment and gas purification in the environmental protection industry; cigarette filter tip and wooden floor board moisture-proof, odor absorption, automobiles gasoline evaporation pollution control in the related industry, preparation of various impregnant solutions, etc. In the future, activated carbon will have an excellent development prospect and a broad sales market.