Yixing Fanghuizi Environmental Protection Equipment Factory


How to analyze the powdered activated carbon produced by the phosphoric acid method

Phosphoric acid method

The powdered activated carbon produced by the phosphoric acid method has a prosperous mesoporous structure and a prosperous specific surface area, and has large adsorption capacity, high filtration speed, and no zinc salt. It is widely used in the food industry for the decolorization and refining of sugars, glutamic acid and salt, lactic acid and salt, citric acid and salt, wine, condiments, animal and plant proteins, biochemical products, pharmaceutical intermediates, vitamins, antibiotics, etc. Deodorize and remove impurities.

Adsorption technology

Adsorption is divided into two types: liquid phase adsorption and gas phase adsorption. Liquid phase adsorption technology is often evaluated by adsorption isotherm, and gas phase adsorption technology is evaluated by solvent vapor adsorption amount.

The adsorption isotherm indicates the relationship between the partial pressure or concentration of the adsorbed material in the adsorption system and the adsorption amount at a certain temperature, that is, when the temperature is constant, the change between the equilibrium adsorption amount and the partial pressure or concentration can be measured. The remaining curve is plotted on the horizontal axis, and the adsorption amount of the single mass of activated carbon is plotted on the vertical axis.

When the partial pressure or the concentration is kept constant, the contact between the equilibrium adsorption amount and the temperature can be measured, and the contact curve, that is, the adsorption isobar line, is drawn. Since adsorption of a small amount of components in industrial equipment is performed substantially in an isothermal state, the adsorption isotherm zui is important and commonly used.

The solvent vapor adsorption amount indicates the gas phase adsorption function, and the measurement of the adsorption rate of the carbon tetrachloride carbon of the granular activated carbon can be used as an example. Under the regular experimental conditions, the regular carbon layer height, the gas flow rate, the adsorption temperature, the measured tube cross-sectional area, Under the condition of the concentration of carbon tetrachloride vapor, the mixed air stream containing a certain concentration of carbon tetrachloride vapor continuously passes through the activated carbon. When the adsorption saturation is reached, the mass of the carbon tetrachloride adsorbed by the activated carbon sample and the sample quality The percentage is taken as the adsorption rate of carbon tetrachloride.

Regarding the adsorption technology in the use of activated carbon, Zui uses the activated carbon, the operating conditions and the specific treatment materials to be evaluated.

Iodine value discrimination

How to easily identify the unevenness of the adsorption value of activated carbon without the detection equipment? Here are a few simple methods for reference:

1, directly look at the guidelines of the manufacturers supply

2, look at the volume: In order to improve the adsorption function of activated carbon, only the pore structure can be made on activated carbon as much as possible. The more pores, the more loose the activated carbon, the lighter the relative density will be, so the good activated carbon will be lighter. In the case of a flat component package, a good activated carbon will be much larger than the residual activated carbon.

3. Look at the bubbles. Put a small amount of activated carbon into the water. Because of the water penetration effect, the water will gradually immerse into the pore structure of the activated carbon, forcing the air in the pores to be discharged, and then generating a series of extremely fine bubbles, pulling a fine bubble line in the water. Together, I will announce the sound of bubbles, which is very funny. The more intense this phenomenon occurs, the longer the duration, the better the adsorption of activated carbon.

4, see the decolorization technology. Another manifestation of activated carbon adsorption technology is the decolorization technology. Activated carbon has a peculiar technology that can turn colored liquids into light or colorless. This is actually because activated carbon adsorbs pigment molecules in colored liquids. Because of this property of activated carbon, it is widely used in the production process of brown sugar to white sugar in the sugar industry. Take two clear cups, put pure water in one cup, and then drop a drop of red ink (you can use any kind of pigment that is easy to inquire but does not change the water properties, such as blue ink, printer colorful ink, However, you cannot use ink and carbon ink. After mixing evenly, pour half of the colored water into another cup for comparison. Put the activated carbon into the colored water, the amount should reach half or more of the water, so the effect will be more significant. After standing for 10-20 minutes, it will be compared with the reference water sample. Under the flat condition, the stronger the decolorization effect, the adsorption of activated carbon. The better the sex.