KR20220141023A - Manufacturing method of powdered active carbon by use of unreacted carbon - Google Patents

Abstract

The present invention relates to a method for producing powdered activated carbon using unreacted carbon. More specifically, when powdered activated carbon is produced as unreacted carbon, which is a by-product of a petrochemical process, is activated through a firing process, the (modified) hydrous content according to the water content is calculated through the formula for calculating the (modified) hydrolytic content in a hydrolysis process, and hydration is performed so that production can be performed to have exactly the moisture content required by an orderer. According to the present invention, powdered activated carbon with moisture content optimized for all water purification conditions can be produced accurately and with maximized productivity through the hydrolysis process, and thus a user can proceed the amount of powdered activated carbon, the use method, and the target of use according to the plan from the accurate water content.

Description

Manufacturing method of powdered activated carbon using unreacted carbon {MANUFACTURING METHOD OF POWDERED ACTIVE CARBON BY USE OF UNREACTED CARBON}

The present invention relates to a method for producing powdered activated carbon using unreacted carbon, and more particularly, when unreacted carbon, a by-product of a petrochemical process, is activated through a calcination process, it is manufactured to have a desired moisture content in a hydrolysis process. It relates to a method for producing powdered activated carbon using unreacted carbon.

In general, activated carbon is a porous carbon material with a strong adsorption property due to a developed pore structure. Ashes, charcoal, lignite, peat, etc. generated during combustion of solid inorganic or organic materials are carbonized together with an activator, or charcoal is converted into water vapor. produced by activation.

Raw materials mainly used to manufacture such activated carbon include coconut, coal, wood, ligrin, and the like, and the most famous is coconut shell activated carbon made from the bark of a coconut tree with the most developed pore structure.

In addition, activated carbon is classified into powder activated carbon, fibrous activated carbon, granular activated carbon, etc. according to the powder state and particle state, and is used for deodorization, decolorization, adsorption and removal of contaminants such as organic compounds.

However, among the activated carbon currently produced, activated carbon using solid inorganic materials such as coal or peat as a raw material has a problem in that the raw material must be mined. Coconut activated carbon is the main

Since natural coconut shells, which are raw materials, must be imported from abroad, there are problems such as difficulty in securing, burden of transportation costs, and outflow of foreign currency.

Therefore, due to this problem, the price of the raw material is cheap, and the supply is easy, and the development of an alternative raw material having a performance comparable to that of the currently produced activated carbon is urgently emerging.

On the other hand, the carbon material, which is a material of activated carbon, is generated as a by-product during the operation of a petrochemical process for producing a basic raw material of a petrochemical product, and the most representative example of such a by-product is unreacted carbon.

Here, if the unreacted carbon is described in more detail, the unreacted carbon is partially oxidized by using a boiler (steam) and an oxygen preheater in a gasification reactor to partially oxidize bunker oil and crude-oil to synthesize gas (CO). It is a by-product generated when 1 to 2% of +H2) is produced, or when bunker oil and other oils are used as fuel and burned in a combustion chamber.

Although unreacted carbon generated during this petrochemical process is composed of components such as carbon powder and ash, it is a good quality raw material suitable for activated carbon. the current situation.

The applicant of the present invention proposed a method and apparatus for manufacturing powdered activated carbon from unreacted carbon generated during a petrochemical process in Patent Registration No. 0364984 (Method and Manufacturing Equipment for Powdered Activated Carbon), and Patent Registration No. 0699455 (name; The criteria for selecting raw materials for powdered activated carbon from unreacted carbon in the active carbon raw material substitution using by-products of petrochemical processes were presented.

On the other hand, unreacted carbon generated during the petrochemical process is hydrolyzed to have a moisture content of 80% or more and taken out, thereby preventing environmental pollution due to the generation of dust during transportation and storage, and unreacted carbon having a moisture content of 80% or more. Powdered activated carbon is produced through the activation process following complete combustion through the firing process.

At this time, the powdered activated carbon dried through the firing process has a significantly reduced moisture content, so when it is put into wastewater as it is, it scatters easily even in a windless state, causing environmental pollution. It does not settle while floating, so there is a fatal problem such as significantly lowering the purification efficiency.

Therefore, the powdered activated carbon that has undergone the firing process is manufactured to contain a certain amount of moisture while undergoing a hydrolysis process.

However, since the adsorption efficiency, the degree of scattering, and the manufacturing cost are determined according to the moisture content of the powdered activated carbon, it must be accurately manufactured to have a desired moisture content according to the purpose. By manufacturing powdered activated carbon according to the rules of thumb or the rules of thumb according to the field workers, technical problems such as the water purification efficiency cannot be predicted because the moisture content does not fit the purpose when used.

Accordingly, the present applicant intends to propose a method for manufacturing powdered activated carbon using unreacted carbon, which can be efficiently manufactured to have a moisture content suitable for use in the hydrolysis process of powdered activated carbon.

Registered Patent Publication No. 10-0699455 (Replacement of activated carbon raw materials using by-products of petrochemical processes) Registered Patent Publication No. 10-0364984 (Manufacturing method and manufacturing apparatus of powdered activated carbon) Registered Patent Publication No. 10-0827851 (flame retardant modified activated carbon for removal of dioxins)

In order to improve the problems of the prior art, the present invention provides a formula for calculating the (modified) water content in the hydrolysis process when powdered activated carbon is produced while unreacted carbon, a by-product of the petrochemical process, is activated through the calcination process. An object of the present invention is to provide a method for manufacturing powdered activated carbon using unreacted carbon, which can be manufactured to have the moisture content required by the customer precisely by calculating the (modified) water content according to the moisture content and adding water.

In order to achieve the above object, the present invention selects unreacted carbon having a carbon content of 93.5 to 97 wt %, an ash content of 3 to 6.5 wt %, and a particle size of 1 to 50 μm among by-products in a petrochemical process, and then sorting a quantitative supply process 100 in which a quantitative amount of unreacted carbon is supplied; a first crushing process 200 for first crushing the selected unreacted carbon into a 30-80 mesh; a calcination step 300 of calcining the pulverized unreacted carbon at a temperature of 180 to 250° C. or 350 to 450° C. for 10 to 30 minutes to process it into powdered activated carbon; a secondary grinding process 400 for secondary grinding of powdered activated carbon to 195 to 205 mesh; A watering process 500 for producing powdered activated carbon so as to have a moisture content required by the customer; In the manufacturing method of powdered activated carbon using unreacted carbon comprising: a product packaging process 600 for packaging a product of powdered activated carbon, the hydrolysis step 500 inputs the weight (W) and initial moisture content (Hs) of the powdered activated carbon step 510; a target moisture content (Ho) input step 520 of the powdered activated carbon; Calculation step 530 of the water content (Mp); (Correction) supplying and stirring the water content step (540) and; A production moisture content (He) input step of the activated carbon powder (550) and; It provides a method for producing powdered activated carbon using unreacted carbon, characterized in that it comprises;

The present invention configured as described above can produce powdered activated carbon with a moisture content optimized for all water purification conditions accurately and with maximized productivity through the hydrolysis process, and from this, the user can use the accurate moisture content to determine the amount of powdered activated carbon, usage method, and target of use. It is possible to proceed according to the plan, thereby providing effects such as significantly improving work productivity.

1 is a process diagram showing a manufacturing process of powdered activated carbon using a general unreacted carbon;
2 is a flowchart illustrating a hydrolysis process in a method for manufacturing powdered activated carbon using unreacted carbon according to the present invention.

Hereinafter, the present invention will be described in detail through preferred embodiments.

In the present invention, after selecting only unreacted carbon having a carbon content of 93.5 to 97wt%, an ash content of 3 to 6.5wt%, and a particle size of 1 to 50㎛ among by-products in the petrochemical process (hereinafter "selected unreacted carbon") ), again, by maximizing micropores through a reprocessing process such as a step-by-step calcination process for the selected unreacted carbon, the specific surface area is further enlarged, and powdered activated carbon with significantly improved adsorption capacity is used.

At this time, the powdered activated carbon using the unreacted carbon has a high carbon content and low ash content, and very fine pores are formed, so it is perfectly suitable as a raw material for activated carbon. It has the ability to adsorb/remove substances.

On the other hand, the method for producing powdered activated carbon using unreacted carbon according to the present invention includes a quantitative supply process 100 in which a fixed amount of selected unreacted carbon is supplied as shown in FIG. 1 ; a first crushing process 200 for first crushing the selected unreacted carbon into a 30-80 mesh; a calcination process 300 of calcining the pulverized unreacted carbon at a temperature of 180 to 250° C. or 350 to 450° C. for 10 to 30 minutes and processing it into powdered activated carbon; a secondary grinding process 400 for secondary grinding of powdered activated carbon to 195 to 205 mesh; A watering process 500 for producing powdered activated carbon so as to have a moisture content required by the customer; It consists of a product packaging process 600 for packaging a product of powdered activated carbon.

In particular, the activated carbon powder that has undergone an activation process such as the firing process 300 is configured to be processed and produced to have various moisture content according to the request of the customer in the hydrolysis process 500 .

At this time, the moisture content indicates the weight of the moisture content in the total weight of the powdered activated carbon as a percentage. The higher the value, the greater the weight of the powder particles absorbing moisture, and the problem of scattering that causes environmental pollution during storage, transportation and spraying is reduced. At the same time, the absorption efficiency can be increased by accelerating the dissolution rate (hydrophilicity) as it settles easily without floating on the water surface by its own weight.

However, when the moisture content of powdered activated carbon is excessively high, its own weight increases, which increases the difficulty in transportation and spraying. On the contrary, if the moisture content is too small, the degree of scattering during spraying is excessive, causing environmental pollution, and at the same time floating on the water surface as it is and sedimentation does not occur smoothly, so there are various problems such as a marked decrease in the water purification function. .

After all, since the moisture content of the powdered activated carbon determines its adsorption efficiency and water purification efficiency, the degree of scattering during spraying, and the manufacturing cost, it is very important to accurately prepare the powdered activated carbon to have a desired moisture content according to its use.

In other words, the orderer can maximize the productivity of purified water by establishing a plan for the target, amount, and method of use of the powdered activated carbon, and then using the powdered activated carbon with the optimum moisture content suitable for the purification plan.

Therefore, in the method for manufacturing powdered activated carbon using unreacted carbon according to the present invention, a hydrolysis process 500 capable of producing powdered activated carbon to have a moisture content required by an orderer is to be presented in detail.

In the method for manufacturing powdered activated carbon using unreacted carbon according to the present invention, as shown in FIG. 2, the powdered activated carbon is controlled to have a target moisture content (Ho) through a hydrolysis process 500, wherein the hydrolysis process 500 is a weight (W) and initial moisture content (Hs) input step 510 of the powdered activated carbon; a target moisture content (Ho) input step 520 of the powdered activated carbon; Calculation step 530 of the water content (Mp); (Correction) supplying and stirring the water content step (540) and; A production moisture content (He) input step of the activated carbon powder (550) and; The production moisture content (He) of the powdered activated carbon and the target moisture content (Ho) comparison operation step (560); is composed of.

At this time, in the step 510 for inputting the weight (W) and initial moisture content (Hs) of the powdered activated carbon, the weight (W; unit kg) and The initial moisture content (Hs) is measured and entered, and the weight (W) of the powdered activated carbon is the weight including the pure powdered activated carbon and moisture content, and the initial moisture content (Hs) of the powdered activated carbon is the percentage of the moisture content included in the powdered activated carbon.

Here, the target moisture content (Ho) input step 520 of the powdered activated carbon is a step of setting and inputting the moisture content of the powdered activated carbon requested by the orderer as the target moisture content, and in the calculating step 530 of the water content (Mp), the following formula It is configured to calculate and control the water content (Mp) according to the target moisture content (Ho) of the powdered activated carbon through .

In addition, in the (modified) water content supply and stirring step 540, the water content (Mp) calculated in the calculation step 530 of the water content (Mp) is supplied and at the same time agitating the powdered activated carbon, The production moisture content (He) input step 550 is a step of measuring and inputting the production moisture content (He) of the hydrogenated powdered activated carbon.

At this time, the production moisture content (He) of the powdered activated carbon and the target moisture content (Ho) comparison operation step 560 compares the set target moisture content (Ho) and the input production moisture content (He) with each other and calculates the moisture content of the currently produced powdered activated carbon When the production moisture content (He) is the same as the target moisture content (Ho), the watering process 500 is controlled to be terminated as it is.

However, by comparing the production moisture content (He) and the target moisture content (Ho) of the powdered activated carbon with the target moisture content (Ho) set in the comparison operation step (560) and the input production moisture content (He) with each other, the moisture content of the currently produced powdered activated carbon is When the production moisture content (He) is less than the target moisture content (Ho), the correction mantissa content (rMp) is calculated in Equation 2 below to correct and control the mantissa.

And, in the (crystallized) water supply and stirring step 540, the calculated modified water content (rMp) is supplied and the powdered activated carbon is re-stirred, and the production moisture content (He) of the powdered activated carbon input step 550 is the hydrogenated powder The production moisture content (He) of the activated carbon is measured again.

Here, by comparing the production moisture content (He) and the target moisture content (Ho) of the powdered activated carbon with the target moisture content (Ho) set in the comparison operation step (560) and the input production moisture content (He) again, the moisture content of the currently produced powdered activated carbon is When the production moisture content (He) is the same as the target moisture content (Ho), the watering process 500 is controlled to be terminated as it is.

On the other hand, in Table 1 below, the water content (Mp) according to the initial moisture content (Hs), the weight (W) of the powdered activated carbon, and the target moisture content (Ho) of the powdered activated carbon is calculated through the calculation formula of the hydrous content (Mp). indicated.

division Target moisture content of powdered activated carbon (Ho) 30% 40% 50% 60% 70% 80% 90% Initial moisture content
(Hs) 10% Powdered Activated Carbon Weight (W) 1000 1000 1000 1000 1000 1000 1000 Water content (Mp) 222 333 444 556 667 778 889 Initial moisture content
(Hs) 20% Powdered Activated Carbon Weight (W) 1000 1000 1000 1000 1000 1000 1000 Water content (Mp) 125 250 375 500 625 750 875 Initial moisture content
(Hs) 30% Powdered Activated Carbon Weight (W) 1000 1000 1000 1000 1000 1000 1000 Water content (Mp) 0 143 286 429 571 714 857

Referring to Table 1, it can be seen that, in the case of powdered activated carbon according to the present invention, a significantly higher hydration content (Mp) than the normal hydration content is required to obtain the target moisture content (Ho), and in particular, the higher the target moisture content (Ho), the greater the valence It was confirmed that the increase in the content was larger.

As such, although specific embodiments have been described in the detailed description of the present invention, various modifications are possible without departing from the scope of the present invention.

Therefore, it is natural that the practical scope of the present invention should not be limited by the above-described embodiments, and should be defined by the claims and equivalent structures as well as the claims to be described later.

100: quantitative supply process 200: first grinding process 300: firing process 400: second grinding process 500: watering process 600: product packaging process

Claims (2)

Among the by-products in petrochemical process, unreacted carbon with a carbon content of 93.5~97wt%, ash content of 3~6.5wt%, and a particle size of 1~50㎛ is selected, and then the quantitative supply of a quantitative amount of the selected unreacted carbon is supplied. process 100; a first crushing process 200 for first crushing the selected unreacted carbon into a 30-80 mesh; a calcination step 300 of calcining the pulverized unreacted carbon at a temperature of 180 to 250° C. or 350 to 450° C. for 10 to 30 minutes to process it into powdered activated carbon; a secondary grinding process 400 for secondary grinding of powdered activated carbon to 195 to 205 mesh; A watering process 500 for producing powdered activated carbon so as to have a moisture content required by the customer; In the manufacturing method of powdered activated carbon using unreacted carbon consisting of; a product packaging process 600 for packaging a product of powdered activated carbon,
The hydrolysis process 500 includes a step 510 of inputting the weight (W) and initial moisture content (Hs) of the powdered activated carbon; a target moisture content (Ho) input step 520 of the powdered activated carbon; Calculation step 530 of the water content (Mp) and; (Correction) supplying and stirring the water content step (540) and; A production moisture content (He) input step of the activated carbon powder (550) and; Including; the production moisture content (He) of the powdered activated carbon and the target moisture content (Ho) comparison operation step (560);
The hydrous content (Mp) is a method for producing powdered activated carbon using unreacted carbon, characterized in that it is configured to be calculated from the following equation.

The method according to claim 1,
The production moisture content (He) and the target moisture content (Ho) of the powdered activated carbon are compared and calculated in the comparison operation step (560) by comparing the target moisture content (Ho) and the production moisture content (He) so that the production moisture content (He) is smaller than the target moisture content (Ho) If it is, it is configured to correct and control the mantissa of the supply and stirring step 540 of the (crystal) water content by calculating the modified water content (rMp),
The modified water content (rMp) is a method for producing powdered activated carbon using unreacted carbon, characterized in that it is configured to be calculated from the following equation.

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