Powdered activated carbon technical parameters and purchase

Powdered activated carbon is made of high-quality charcoal as raw material and refined by special production process. There are two kinds of physical methods and chemical methods. After being activated by steam, it is refined and pulverized. This product has a black powder appearance and does not dissolve under normal solutions. It is odorless and tasteless, with large surface area, strong adsorption, high purity, fast filtration speed, stable quality, flocculation effect and filter aid effect. It is widely used in the decolorization and impurity removal of food, medicine, MSG and other products. It can also be used for the purification of water.

Chemical powdered activated carbon:

Appearance: It is black powder, odorless, tasteless, and does not dissolve in general solvents.

Performance: high quality wood chips and husks are used as raw materials, zinc chloride and phosphoric acid are activators. They are carbonized and activated and refined. The finished product has excellent adsorption capacity and low impurity content.

Uses: It is suitable for the purification of decolorized phase of sugars such as glucose sucrose and maltose, as well as the removal, purification and purification of macromolecular pigments in citric acid, cystine, oil and chemical products.

Physical powdered activated carbon:

Properties: It is made of high-quality nut shell and wood chips. After steam activation, it is refined and pulverized. The appearance is black fine powder, non-toxic, odorless, with large specific surface area and strong adsorption capacity.

Uses: This product is suitable for decolorization, impurity removal and exquisiteness of medicines, food additives, monosodium glutamate, chemicals, beverages, etc. It is suitable for water purification treatment.

The wood powdered activated carbon produced by the phosphoric acid method has a developed mesoporous structure and a developed 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.

The injection carbon has low impurity, high purity, fast filtration speed, excellent decolorization, purification and purification, and is mainly used for decolorization, refining and removal of "heat source" of various injection chemicals. It can also be decolorized with vitamin C and other APIs, with strong decolorization power and fast filtration speed. It is suitable for decolorization and refining of medicines, pesticides and Chinese and Western medicines. It has the function of absorbing intestinal bacteria and detoxification.

Powdered activated carbon production method: 1. Zinc chloride method; 2. Phosphoric acid method.

Powdered activated carbon features:

The wood powdered activated carbon produced by the zinc chloride method has a developed mesoporous structure, large adsorption capacity, and fast filtration. It is mainly used in various amino acid industries, such as decolorization, purification, deodorization and impurity removal of high pigment solutions such as refined sugar decolorization, monosodium glutamate industry, glucose industry, starch sugar industry, chemical additives, dye intermediates, food additives and pharmaceutical preparations.

Powdered activated carbon technical parameters:

Iodine value>900mg/g;

Methylene blue adsorption value ≥ 120mg / g;

Specific surface area>1000m2/g;

Water ≤ 8%;

PH value 5-7;

The wood powdered activated carbon produced by the phosphoric acid method has a developed mesoporous structure and a developed 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.

(1), production of raw materials:

For example, the activated carbon is prepared from rice husks, the flammable gas, carbon and tar are prepared from waste plants, and the activated carbon is used to prepare activated carbon. The chemical department of our school has also made a large amount of activated carbon for the local resources - wheat straw and corn stalk instead of wood. The research work has been awarded the provincial appraisal results in 1999. In addition to this, it is also reported that sugar cane bagasse, organic industrial waste, etc. are used as raw materials for the preparation of activated carbon.

(2) Production process:

With the increasing awareness of environmental protection, the physical activated carbon process will gradually be valued by people. In order to improve the adsorption performance of physical activated carbon, various production units have tried many times, for example, changing the high-temperature steam activation process twice. Can significantly improve the decolorization of the product.

(3) Production equipment:

The activation furnace is the most important key equipment for the production of activated carbon. Although the rotary furnace has simple operation, low labor intensity, uniform material activation and stable product quality, due to the high temperature of the flue gas, some zinc chloride in the gas phase is brought in and increased. Consumption, if a flat-plate furnace is used, although the efficiency is low, occasionally there are disadvantages such as uneven carbonization activation, but the operation flexibility is large and the pollution is easy to solve. How to weigh the two, experts are exploring this, I believe that in the near future there will be a small efficient, high degree of mechanization, product quality and stable high efficiency activation furnace.

It is necessary to combine the respective advantages of the two activated carbons according to the specific process and its purpose.

Powdered activated carbon is usually applied in a liquid phase, and after adding a liquid, it is stirred, mixed, filtered or sedimented to obtain a desired liquid. The advantages of powdered activated carbon treatment are: suitable for batch process; easy to control the amount of addition; available off-the-shelf filtration equipment; lower price.

Granular activated carbon can be used in the liquid phase as well as in the gas phase. The liquid or gas to be treated is generally passed continuously through the activated carbon column. The characteristics of granular activated carbon treatment are: suitable for continuous process and automatic control; less activated carbon consumption, high carbon/liquid ratio used; easy to clean operation; should be regenerated due to high price and high use, and easy to regenerate .

Activated carbon products mainly include coconut shell activated carbon, shell activated carbon, coal-based activated carbon, etc. No matter what kind of activated carbon you use, it is a hydrophobic adsorbent prepared by carbonization and activation. After a series of processing, it becomes a finished activated carbon. The husk activated carbon contains a large number of micropores, has a large specific surface area, can effectively remove chromaticity and odor, and can remove most organic pollutants and some of the secondary effluent. Inorganic, containing certain toxic heavy metals. Next, the experts tell you a few common sense to buy shell activated carbon.

(1) The two activated carbons have the same weight, and the larger the volume, the stronger the adsorption capacity.

In order to improve the adsorption performance of the activated carbon of the shell, only the pore structure is built on the activated carbon as much as possible. The more pores, the looser the activated carbon, the lighter the relative density, so the good activated carbon will be lighter. In the case of the same weight package, the performance of the activated carbon will be much larger than the inferior activated carbon. Haixin advanced air adsorption special shell carbon, ordinary coconut shell activated carbon volume is more than 1/3, pore diameter developed material loose, the same weight of shell activated carbon can absorb more harmful gases.

(2) Whether it is coconut shell carbon or shell carbon, the high iodine value is good carbon.

Activated carbon purification gas relies on adsorption capacity. There is an important index of adsorption capacity - iodine value. The higher the iodine value, the stronger the adsorption capacity. The hotter heat is now coconut shell carbon, but some unactivated or technically unrecognized coconut shell iodine values ​​may not reach 500. In addition to some well-known brands that are certified to go2map, we should ask the seller to produce an iodine value test report when purchasing most other activated carbon.

(3) The charcoal permeability of the packaged shell activated carbon product is very important.

Put the charcoal bag on the mouth and blow it. If the gas can easily pass through the charcoal bag, the air permeability of the charcoal bag is good. If the charcoal bag feels unable to blow, the air is difficult to pass, and the better carbon installed on the surface is also difficult to play a big role. As a product of passive adsorption, the air must be able to penetrate freely into the deep layer of the carbon package, and the carbon package can play a good role in air purification and adsorption. In theory, tearing the charcoal package and putting the charcoal directly into the tray may be the best way to pass air. Of course, this method has a certain impact on environmental sanitation.

(4), bamboo charcoal we often hear is not activated carbon.

The focus of each product is different. Bamboo charcoal has a certain adsorption capacity for moisture and has the effect of adjusting the spatial humidity. However, bamboo charcoal micropores have low iodine value and cannot be used as a harmful gas purification product. Its pore size has a weak ability to capture harmful gases and cannot firmly capture the captured formaldehyde molecules.

(5), any activated carbon is not omnipotent.

If the drug is used as a metaphor for decorating pollution control products, then activated carbon is more like traditional Chinese medicine and formaldehyde scavenger is more like western medicine. One pays attention to conditioning but it has a slower effect, and it is immediate but not root. The combination of the two products is the best match with the Tianlong Ba Bu, just like the combination of Chinese and Western medicine that the medical profession has recently admired. In a short period of time, it is unrealistic to rely on activated carbon to quickly reach the standard and quickly remove the taste. In general, the use of activated carbon in the spring, summer and autumn is based on the pollution and ventilation conditions for 1-2 months of ventilation, especially in the winter in the north. It is not recommended to use activated carbon alone, and must cooperate with some formaldehyde scavenger products for pollution sources. In general construction, the treatment agency will first use formaldehyde scavenger to remove most of the pollution sources, and the residual pollution source will be slightly over-subscribed to the shell activated carbon.

5. Advantages of shell activated carbon:

The shell activated carbon has the advantages of developed pore structure, large specific surface area, strong adsorption capacity, high mechanical strength, small bed resistance, good chemical stability, easy regeneration and durability, and the shell activated carbon has various specifications of granularity.

6. The negative effects of activated carbon:

(1) Activated carbon adsorbs a large amount of organic matter. These organic substances will become the nutrients of microorganisms such as bacteria. The bacteria will multiply and proliferate in the micropores of activated carbon, and may cause the total number of colonies in the effluent to exceed the standard.

(2) The activated carbon in the water purifier converts the ammonia nitrogen in the water into nitrite nitrogen under the action of microorganisms. It is often found that the nitrite in the water purifier effluent is many times higher than the influent water. Nitrite itself is not a carcinogen, but its nitrosamines formed by reaction with amines in water are strong carcinogens.

(3) Filtration or UV sterilization of effluent plus bromine resin (brominated polystyrene hydantoin) adsorbed by activated carbon is a good method to solve the problem of microbial exceeding in water. Io Smith (Shanghai) Water Treatment Products Co., Ltd. added a small amount of bromine resin to the post-activated carbon filter of some household reverse osmosis water purifiers. The effluent is sterile and exported to European countries.

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