KR20000052120A - Method for prducing activated carvon using oxidizing power of ferric sulfate s - Google Patents

Abstract

PURPOSE: A process for preparing activated carbon using mineral oil, in particular bunker C oil and ferric sulfate is provided which can produce activated carbon having high activity at low cost. CONSTITUTION: A process comprises the steps of mixing 20 to 25% by weight of heavy oil (C35H72.C40H40) containing 85% by weight of carbon and 15% by weight of hydrogen with ferric sulfate, heating at 300 to 500°C and added with water when carbonization is completed, and filtering. The ferric sulfate in filtrate is mixed with an oxidizing agent such as H2O2, HNO3 and KNO3 to reuse. The heavy oil which is carbonized at high viscosity and high temperatures is used as raw material.

Description

METHODS FOR PRDUCING ACTIVATED CARVON USING OXIDIZING POWER OF FERRIC SULFATE S}

The present invention relates to a process for producing activated carbon prepared by mixing ferric sulfate in mineral oil, in particular heavy oil such as banca C oil and heating to 300 ℃ ~ 500 ℃.

Activated carbon is a fine particle made of pure carbon (C), which is widely used in food refining, pharmaceutical refining, water and sewage refining, and toxic gas removal and pollution prevention facilities. Imported from and used.

Conventional activated carbon manufacturing method uses activated carbon manufacturing method of steam regeneration method that carbonizes and adds water, such as coconut shell, fruit peel or grain waste, as raw material, so there is a lot of loss of raw materials, high production cost and time. It also took a long time, and the production efficiency was also poor.

The present invention is described in detail as being invented to correct the above conventional drawbacks as follows.

The present invention selects mineral oils having a specific constituent condition, that is, mineral oils containing 85% carbon and 15% hydrogen, such as banca C oil, as a raw material and mixing the oxidizing agent with the conventional manufacturing method. By heating to a certain temperature, hydrogen in the mineral oil reacts and is discharged to water vapor and SO ₂ gas to form a carbon of the porous body is characterized by obtaining a product having a high activity at a much lower price than the conventional manufacturing method.

In particular, the raw material of the present invention is a heavy oil such as banca C oil as a raw material of carbon (C ₃₅ H ₇₂ ) and mineral oil having a content ratio of 85% to 15% by weight of hydrogen, the hydrogen in the raw material to oxidize ferric sulfate It reacts to make water and heats it and discharges it in the state of water vapor and sulfurous acid gas to produce porous activated carbon.

Banca C oil referred to in the present invention

Molecular Composition C ₃₅ H ₇₂

Molecular Weight 492

Carbon content 85.36%

It is composed of 14.6% hydrogen.

When ferric sulfate is mixed with mineral oil having such a molecular structure and heated to 300 ° C to 500 ° C, hydrogen in the raw material reacts with the oxidant to become water, and is discharged in the form of water vapor and sulfurous acid gas. It can be manufactured.

Meanwhile, ferrous sulfate with reduced oxidizing agent used in the manufacture of the present invention is dissolved and eluted in water, separated from activated carbon, and the separated filtrate is fertilized by injecting air after filtering and refining to produce ferric sulfate. Concentrate to make ferric sulfate monohydrate powder to reuse.

This is proved by the equation

Ferrous Sulfate 2FeSO ₄ + H ₂ SO _4- O ₂ →

It is synthesized from ferric sulfate Fe ₂ (SO ₄ ) ₃ + H ₂ O.

The molecular equation of the reaction scheme obtained in the production method of the present invention is as follows.

Ferric sulfate

Molecular formula Fe ₂ (SO4) ₃

Molecular Weight 398

The ferric sulfate molecular diagram is represented by FeSO ₄ + FeSO ₄ + SO ₄ . Expressed as

During pyrolysis of SO ₄ , 2 molecules are decomposed in the form of SO ₂ + O ₂ .

In other words, when combined decomposition with hydrogen of Fe ₂ (SO ₄ ) ₃ salt is decomposed by the equation of 2FeSO ₄ + SO ₂ + 2H ₂ O.

The equation that combines with banca C oil

18 Fe ₂ (SO ₄ ) ₃ + C ₃₅ H ₇₂ → 36FeSO ₄ + 18SO ₂ + 36H ₂ O + 35C

As shown in the above equation, all hydrogens in banca C oil are converted into H ₂ O, that is, water, and only carbon is released. At this time, the holes from which hydrogen escapes remain in the space and form porous activated carbon.

As can be seen above, when banca C oil is added in excess of the amount of oxygen oxide of ferric sulfate, ferric oxide (Fe ₂ O ₃ ) salts are formed and loss of ferric sulfate and ferric sulfate occurs.

The reason for this is as follows.

1.2FeSO ₄ + CH ₂ → FeO ₃ + 2SO ₄ + H ₂ O + C

2.Fe ₂ (SO ₄ ) ₃ + C ₃ H ₆ → FeSO ₄ + 3SO ₂ + 3H ₂ O + 3C

In view of the above reaction, in order to limit the loss of ferrous sulfate and ferric sulfate, banca C oil should be supplied with a quantitative value similar to the theoretical value.

That is, banca C oil is added to the total amount of ferric sulfate at an average level of 20 to 25% (wt%) to pyrolyze and carbonize to produce activated carbon.

It is also preferable that the amount of free sulfuric acid is less than 10%, and the ferric sulfate content is also preferably monohydrate.

In addition, high carbon content such as pit paper containing less hydrogen and less carbon than banca C oil increases the production of activated carbon but decreases its activity.

Example <1>

1 kg of ferric sulfate monohydrate [Fe ₂ (SO ₄ ) ₃ H ₂ O] finely pulverized into 100 mesh is mixed with 25Og of banca C oil in a C ₃₅ H ₇₂ state and placed in a heating container at 350 ° C to 500 ° C. Water vapor and sulfurous acid gas (SO ₂ ) was completely discharged by heating, and when carbonization was completed, the mixture was poured into 2500cc of water, eluted and filtered. The filtrate was recovered with an iron sulfate solution and 220g of activated carbon was obtained.

The activated carbon obtained in this way was found to have a function of about 1.5 to 2 times higher activity than commercially available activated carbon.

Example <2>

1 kg of ferrous sulfate monohydrate [Fe ₂ (SO ₄ ) ₃ H ₂ O] finely pulverized into 100 mesh was injected and mixed with 30Og of asphalt in a C ₄₀ H ₃₀ state and placed in a heating container at 350 ° C to 500 ° C. After heating, water vapor and sulfurous acid gas (SO ₂ ) were completely discharged, and when carbonization was completed, the resultant was poured into 2500cc of water, eluted and filtered. The filtrate was recovered with an iron sulfate solution to obtain 280 g of activated carbon.

In this experiment, the leisure carbon activity was reduced by 20% compared to the first time.

It was found that the activity was insufficient because the amount of hydrogen was insufficient in asphalt.

Example <3>

1 kg of ferric sulfate monohydrate [Fe ₂ (SO ₄ ) ₃ H ₂ O] was finely pulverized and 100 kg of banca C oil was mixed with 100 g of diesel oil, and placed in a heating container and heated to 350 ° C. to 50 ° C. Water vapor and sulfurous acid gas (SO ₂ ) was completely discharged, and when carbonization was completed, the mixture was poured into 2500cc of water, eluted, filtered, and the filtrate was recovered with an iron sulfate solution to obtain 150g of activated carbon.

In this case, since most of the light oil evaporated and a part of it was carbonized, it was proved that pyrolysis of non-evaporable high-viscosity heavy carbon oil at the temperature of 350 ° C to 500 ° C should be used as pyrolysis.

As shown in the examples, the raw material used in the production of activated carbon of the present invention should be used as a raw material of heavy oil carbonized at high viscosity high temperature in the level of C ₃₅ H ₇₂ ~ C ₄₀ H ₃₀ and the heating temperature is complete at 350 ℃ ~ 500 ℃ I knew that I should be a carbonization point.

Claims (3)

Ferric sulfate is mixed with heavy oil (C ₃₅ H ₇₂ , C ₄₀ H ₄₀ ) under specific conditions, and heated to 300 ℃ ~ 500 ℃ to convert hydrogen in heavy oil to water to be discharged as water vapor and SO ₂ GAS, and only carbon Method of producing activated carbon using the oxidizing power of ferric sulfate obtained by liberation by elution with water after evaporation Iron sulfate of the filtrate separated in claim 1 is mixed with an oxidizing agent such as air H ₂ O ₂ , HNO ₃ , KNO ₂ and reoxidized to be reused as ferric sulfate. Method of manufacturing activated carbon using oxidizing power of ferric iron Method for producing activated carbon using the oxidizing power of ferric sulfate, characterized in that the addition of an average of 20 to 25% by weight of banca C oil to the total amount of ferric sulfate salt in claim 1