CN108342100B - Carbon black oxidation process - Google Patents
Carbon black oxidation process Download PDFInfo
- Publication number
- CN108342100B CN108342100B CN201810059141.9A CN201810059141A CN108342100B CN 108342100 B CN108342100 B CN 108342100B CN 201810059141 A CN201810059141 A CN 201810059141A CN 108342100 B CN108342100 B CN 108342100B
- Authority
- CN
- China
- Prior art keywords
- carbon black
- ozone
- reactor
- oxygen
- mixed gas
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
- C09C1/44—Carbon
- C09C1/48—Carbon black
- C09C1/56—Treatment of carbon black ; Purification
- C09C1/565—Treatment of carbon black ; Purification comprising an oxidative treatment with oxygen, ozone or oxygenated compounds, e.g. when such treatment occurs in a region of the furnace next to the carbon black generating reaction zone
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Pigments, Carbon Blacks, Or Wood Stains (AREA)
- Carbon And Carbon Compounds (AREA)
Abstract
The present invention provides a process for the oxidation of carbon black comprising: a step of generating ozone by using oxygen in an ozone generator to obtain a mixed gas of oxygen and ozone; supplying carbon black to a reactor provided with an inlet and an outlet, and then introducing the mixed gas into the inlet to bring the mixed gas into contact with the carbon black in the reactor, thereby oxidizing the carbon black; a step of collecting gas discharged from the discharge port of the reactor to obtain a collected matter containing oxygen and carbon black fine powder; removing the carbon black fine powder by filtering the collected matter with a filter; and regenerating ozone from the collected matter from which the carbon black fine powder has been removed, and reintroducing the ozone into the reactor.
Description
Technical Field
The present invention relates to a process for the oxidation of carbon black.
Background
Carbon black is originally hydrophobic and is used in combination with other substances for various purposes, and therefore, it is necessary to modify the carbon black to be hydrophilic. For example, when carbon black modified to be hydrophilic is applied to ink, paint, or the like, dispersibility in an aqueous solution can be improved.
There is a method of introducing a functional group to the surface in order to modify the carbon black into hydrophilicity. Such methods include wet oxidation treatment. In the wet oxidation treatment method, for example, carbon black is oxidized with a nitric acid solution, thereby introducing functional groups to the surface.
Disclosure of Invention
Technical problem to be solved by the invention
An embodiment of the present invention provides a carbon black oxidation process that can reduce production costs.
Technical scheme
In one embodiment of the present invention, a method for oxidizing carbon black is provided, comprising: a step of generating ozone by using oxygen in an ozone generator to obtain a mixed gas of oxygen and ozone; supplying carbon black to a reactor provided with an inlet and an outlet, and then introducing the mixed gas into the inlet to bring the mixed gas into contact with the carbon black in the reactor, thereby oxidizing the carbon black; a step of collecting gas discharged from the discharge port of the reactor to obtain a collected matter containing oxygen and carbon black fine powder; removing the carbon black fine powder by filtering the collected matter with a filter; and regenerating ozone from the collected matter from which the carbon black fine powder has been removed, and reintroducing the ozone into the reactor.
The trapped material from which the carbon black fine powder has been removed may be newly introduced into the ozone generator to regenerate ozone, and the newly generated ozone may be newly introduced into the reactor.
Advantageous effects
The above-mentioned carbon black oxidation method can improve the oxidation reaction efficiency of carbon black, and can reduce the amount of use by reusing oxygen to generate ozone, thereby effectively reducing the production cost.
Further, according to the above-mentioned carbon black oxidation method, the effect of environmental protection can be obtained by not discharging unreacted ozone gas or minimizing the discharge amount thereof.
Drawings
FIG. 1 is a process flow diagram schematically illustrating a carbon black oxidation process according to an example of the present invention.
Detailed Description
Hereinafter, examples of the present invention are described in detail. However, this is for illustration and the invention is not limited thereto, as the invention is defined by the scope of the invention claims set forth above.
In one embodiment of the present invention, a method for oxidizing carbon black is provided, comprising: a step of generating ozone by using oxygen in an ozone generator to obtain a mixed gas of oxygen and ozone; supplying carbon black to a reactor provided with an inlet and an outlet, and then introducing the mixed gas into the inlet to bring the mixed gas into contact with the carbon black in the reactor, thereby oxidizing the carbon black; a step of collecting gas discharged from the discharge port of the reactor to obtain a collected matter containing oxygen and carbon black fine powder; removing the carbon black fine powder by filtering the collected matter with a filter; and regenerating ozone from the collected matter from which the carbon black fine powder has been removed, and reintroducing the ozone into the reactor.
In the above-mentioned carbon black oxidation method, oxidation treatment is performed by reacting carbon black with ozone.
Carbon black is originally hydrophobic and is used in combination with other substances for various purposes, and therefore, it is necessary to modify the carbon black to be hydrophilic. For example, when carbon black modified to be hydrophilic is applied to ink, paint, or the like, dispersibility in an aqueous solution can be improved.
In the above-mentioned carbon black oxidation method, in order to impart hydrophilicity to carbon black, carbon black is modified to be hydrophilic by reacting carbon black with ozone to introduce an oxygen atom-containing functional group such as a hydroxyl group or a carboxyl group to the surface of carbon black. That is, the carbon black is subjected to oxidation treatment using ozone as an oxidizing agent, thereby being modified to be hydrophilic.
FIG. 1 is a process flow diagram schematically illustrating a carbon black oxidation process according to an example of the present invention.
First, in the above-described soot oxidation method, ozone as an oxidizing agent is generated in an ozone generator.
In fig. 1, when oxygen is supplied from the oxygen supplier to the ozone generator, ozone is generated by the ozone generator using oxygen, and the generated ozone is supplied to the reactor in a state of a mixed gas mixed with oxygen.
In the above ozone generator, for example, air or oxygen is used as a main raw material, and ozone can be generated by plasma discharge such as high-voltage arc discharge. After compressing the air using the compressor, only oxygen is separated to use the oxygen alone.
As another example, ozone may be generated by silent discharge such as corona discharge. When ozone is generated by plasma discharge, for example, when a dielectric such as glass or ceramic is sandwiched between electrodes and air or oxygen is blown, and a high voltage (6 to 15kv) is applied to the electrodes, ozone is generated in a discharge space by the following reaction.
O2+e--->O+O+e-
O2+e--->O2*+e-
O+O2+M-->O3+ M (M is carbon black)
O2*+O2-->O3+O
In the ozone generator, when ozone is generated, a mixed gas in which ozone and oxygen are mixed is obtained.
In the mixed gas, oxygen is introduced into the reactor as a carrier gas together with ozone.
The carbon black is supplied in advance before the mixed gas is introduced into the reactor, and in this case, the carbon black is supplied so that the carbon black occupies a volume of 1/2 or less of the total volume of the internal space of the reactor. As described above, the carbon black is supplied to fill the reactor so that the carbon black occupies a volume of 1/2 or less of the total volume of the reactor, and the carbon black can be uniformly treated.
When the mixed gas is fed, the feeding speed of the mixed gas can be adjusted to prevent the carbon black from flying due to the flow velocity of the gas.
The concentration of the mixed gas and the volume of the mixed gas to be fed per hour may be adjusted according to the bulk density of the carbon black in the reactor. In particular, it can be at 15g/m3To 200g/m3The mixed gas is fed at a concentration of (2), and the feeding rate is adjusted according to the size of the reactor. For example, the mixed gas may be fed into the reactor at a rate of 0.5L/min to 5L/min based on a 2.5L reactor. As another example, the mixed gas may be fed into a 70L reactor at a rate of 5L/min to 50L/min. The oxidation efficiency of carbon black can be improved by feeding the mixed gas at an inflow rate within the above numerical range.
The feeding speed may be increased according to the angular velocity of the reactor rotating according to the size of the reactor. For example, the above-mentioned input speed may be increased as the reactor is increased so as to equalize the angular speed rpm at which the reactor is rotated.
As shown in fig. 1, the reactor is provided with an inlet and an outlet, and the mixed gas is introduced from the inlet.
When the mixed gas is injected into the reactor, the mixed gas is brought into contact with the carbon black previously injected into the reactor in a batch manner.
The ozone in the mixed gas reacts with the carbon black in the reactor to modify the surface of the carbon black so that the carbon black is hydrophilic, and then is reduced by oxygen and discharged through the discharge port. In other words, in the above reactor, carbon black reacts with ozone, whereby carbon black is oxidized, thus generating carbon black modified to be hydrophilic.
In order to further increase the contact amount of the carbon black with ozone and improve the modification efficiency, the reactor may be rotated.
Then, the gas discharged from the discharge port of the reactor is collected and reused as a gas-phase oxidizing agent, so that the amount of oxygen used can be reduced.
The gas discharged from the discharge port of the reactor is used as a carrier gas, and oxygen contained in the mixed gas and generated from ozone after the reaction of the oxygen with carbon black is discharged from the discharge port of the reactor. Further, since a small amount of residual ozone that has not reacted with carbon black is discharged together with oxygen, the gas discharged from the discharge port can contain ozone and oxygen at the same time, and the carbon black fine powder is discharged together with the gas discharged from the discharge port.
Therefore, the collected material obtained by collecting the gas discharged from the discharge port contains oxygen and carbon black fine powder, and may contain ozone. In the above-mentioned collected matter, the remainder from which the carbon black fine powder is removed is reused as a gas-phase oxidizing agent.
The collected matter may be filtered by a filter to remove fine carbon black powder, specifically, dust (dustfiltraction).
The collected matter from which the fine carbon black powder is removed by dust filtration mainly contains oxygen, ozone is generated from the oxygen in the collected matter from which the fine carbon black powder is removed, and the newly generated ozone is fed into the reactor again.
In the method of generating ozone by removing oxygen in the collected matter of the fine carbon black powder, for example, an ozone generator is used, or as another example, a method of irradiating with additional Ultraviolet (UV) rays can be used.
In the former case, in order to regenerate ozone from the collected matter from which the fine carbon black powder has been removed, the collected matter from which the fine carbon black powder has been removed is reintroduced into the ozone generator to regenerate ozone, and the regenerated ozone may be reintroduced into the reactor.
In the latter case, the collected material from which the carbon black fine powder has been removed is irradiated with Ultraviolet (UV) rays to generate ozone, and the ozone generated again can be fed again into the reactor. Specifically, ultraviolet light having a wavelength of 240nm or less can be used. When ultraviolet light having a wavelength of 240nm or less, that is, a binding energy between oxygen or more is irradiated to oxygen, double bonds between oxygen are cleaved to generate free oxygen (free oxygen), and the molecule in a high-energy excited state can form O by receiving oxygen3A morphologically unstable ozone gas.
In fig. 1, the collected matter from which the carbon black fine powder is removed and the oxygen to be fed to the ozone generator are supplied to the ozone generator.
In fig. 1, the collected carbon black fine powder is conveyed and removed along a conveyance line indicated by a. The transfer line indicated by A is connected to an oxygen transfer line fed from an oxygen supplier to an ozone generator, so that the collected matter from which the carbon black fine powder is removed can be mixed with oxygen supplied from the oxygen supplier along the transfer line indicated by A.
In another example of the carbon black oxidation method, in a process of feeding and conveying the collected matter from which the fine carbon black powder is removed to the ozone generator, ultraviolet rays are irradiated to the collected matter from which the fine carbon black powder is removed, so that oxygen in the collected matter can generate ozone by means of the ultraviolet rays. That is, in fig. 1, the collected matter from which the carbon black fine powder is removed, which is conveyed along the conveyance line indicated by a, may be irradiated with ultraviolet rays to generate ozone, and at this time, the generated ozone may be continuously conveyed, and may be mixed with oxygen supplied from the oxygen supplier by being connected to the oxygen conveyance line from the oxygen supplier to the ozone generator as described above.
In fig. 1, the collected material from which the carbon black fine powder is removed, which is transported along a transport line indicated by a, may be transported through a transport line. The transfer duct may be designed as a double pipe structure including a first pipe and a second pipe surrounding an outer circumferential surface of the first pipe.
The second tube may be provided with an ultraviolet light source for irradiating ultraviolet light to the collected matter from which the carbon black fine powder is removed, which has passed through the inside of the first tube. Ozone can be generated by irradiating ultraviolet rays to the oxygen in the collected matter from which the carbon black fine powder has been removed. For example, an ultraviolet light emitting diode (UV LED) may be used as the ultraviolet light source. The ultraviolet light source may irradiate light having a wavelength of 240nm or less.
As the material of the first tube, a transparent material that allows ultraviolet rays to pass therethrough can be used.
The above-mentioned carbon black oxidation method can improve the oxidation reaction efficiency of carbon black, and can reduce the amount of oxygen used by generating ozone by reusing oxygen, thereby effectively reducing the production cost.
According to the above-mentioned carbon black oxidation method, an environmental effect can be obtained by not discharging unreacted ozone gas or minimizing the discharge amount thereof.
On the other hand, as described above, the above-mentioned carbon black oxidation method is simple, and therefore, an effect of high efficiency can be obtained without using complicated and expensive mechanical equipment.
The kind of carbon black obtainable by the above-mentioned carbon black oxidation method is not limited, and can be applied to various kinds of carbon blacks such as conductive carbon black, carbon black used as a color-imparting agent for ink or paint, and the like.
Hydrophilic carbon black can be obtained by the above-mentioned carbon black oxidation method, and thus carbon black suitable for effective use as a color-imparting agent for inks or paints can be prepared.
Hereinafter, specific examples of the present invention will be described. However, the embodiments described below are merely intended to specifically exemplify or illustrate the present invention, and the present invention is not limited thereto.
Examples
Example 1
A2.5L reactor equipped with an inlet and an outlet was prepared.
The ozone generator is connected with the input port of the reactor.
Means for trapping the gas discharged from the discharge port of the reactor are also provided.
The unit for trapping the gas discharged from the discharge port is connected to a dust filter via a connecting unit, so that the gas trapped by the unit for trapping the gas discharged from the discharge port is sent to the ozone generator via the dust filter.
50g of carbon black powder was charged into the reactor.
A mixed gas in which ozone generated by injecting oxygen into the ozone generator and oxygen are mixed is introduced into the inlet of the reactor.
Mixing the above mixed gas at 84g/m3The concentration of (3) and the rate of 1L/min were fed into the reactor.
And a step of collecting the gas discharged from the discharge port to obtain a collected matter, wherein the collected matter is passed through a dust filter to remove the fine carbon black powder from the collected matter, and then the collected matter from which the fine carbon black powder has been removed is newly introduced into the ozone generator.
The oxidized carbon black is obtained from the reactor.
The reaction time was adjusted so that the carbon black oxidized by the ozone had a pH of 3, and the reaction time was 2 hours.
The amount of oxygen consumed to obtain the above carbon black having a pH of 3 was 20L.
Comparative example 1
In the same manner as in example 1, 50g of carbon black powder was charged into a 2.5L reactor, and a mixed gas of ozone generated by injecting oxygen into the ozone generator and oxygen was charged into the inlet of the reactor. Unlike example 1, oxidized carbon black was obtained directly from the reactor without trapping the gas discharged from the discharge port of the reactor.
The reaction time was adjusted so that the carbon black oxidized by the ozone had a pH of 3, and the reaction time was 2 hours.
The amount of oxygen consumed to obtain the carbon black having a pH of 3 was 60L.
In example 1, it was confirmed that the amount of oxygen used was significantly reduced as compared with comparative example 1 as the oxygen in the gas discharged from the discharge port of the reactor was reused.
Although the preferred embodiments of the present invention have been described in detail, the scope of the invention is not limited thereto, and various modifications and changes made by those skilled in the art using the basic concept of the present invention defined in the above-described scope of the invention also belong to the scope of the invention.
Claims (8)
1. A method of oxidizing carbon black, comprising:
a step of generating ozone by using oxygen in an ozone generator to obtain a mixed gas of oxygen and ozone;
supplying carbon black to a reactor provided with an inlet and an outlet, and then introducing the mixed gas into the inlet to bring the mixed gas into contact with the carbon black in the reactor, thereby oxidizing the carbon black;
a step of collecting gas discharged from the discharge port of the reactor to obtain a collected matter containing oxygen and carbon black fine powder;
removing the carbon black fine powder by filtering the collected matter with a filter; and
and a step of regenerating ozone from the collected matter from which the carbon black fine powder has been removed and reintroducing the regenerated ozone into the reactor.
2. The method of oxidizing carbon black of claim 1, wherein said trap further comprises ozone.
3. The carbon black oxidation method according to claim 1, wherein the trapped material from which the fine carbon black powder has been removed is newly introduced into the ozone generator to regenerate ozone, and the newly generated ozone is newly introduced into the reactor.
4. The carbon black oxidation method according to claim 1, wherein the trapped substance from which the fine carbon black powder has been removed is irradiated with ultraviolet light to regenerate ozone, and the regenerated ozone is fed into the reactor again.
5. The carbon black oxidation method according to claim 1, wherein the ozone generator generates ozone by plasma discharge and using oxygen.
6. The carbon black oxidation method according to claim 1, wherein the contact amount of ozone with carbon black is increased by rotating the reactor.
7. The method of oxidizing carbon black of claim 1, wherein the amount is 15g/m3To 200g/m3The mixed gas is fed into the reactor at a concentration of (2).
8. The carbon black oxidation method according to claim 1, wherein the oxygen contained in the mixed gas is oxygen compressed and separated from air.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020170010337A KR20180087492A (en) | 2017-01-23 | 2017-01-23 | Method of oxidation of carbon black |
| KR10-2017-0010337 | 2017-01-23 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108342100A CN108342100A (en) | 2018-07-31 |
| CN108342100B true CN108342100B (en) | 2020-03-17 |
Family
ID=62961116
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810059141.9A Active CN108342100B (en) | 2017-01-23 | 2018-01-22 | Carbon black oxidation process |
Country Status (2)
| Country | Link |
|---|---|
| KR (1) | KR20180087492A (en) |
| CN (1) | CN108342100B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11653646B2 (en) | 2019-04-01 | 2023-05-23 | Vulpes Agricultural Corp. | Bifunctional plant promoter and preparation thereof |
| CN112679998A (en) * | 2021-01-11 | 2021-04-20 | 北京化工大学 | Preparation facilities of high pigment carbon black |
| CN112724711A (en) * | 2021-01-11 | 2021-04-30 | 北京化工大学 | Preparation method of high-pigment carbon black |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100588792B1 (en) * | 1998-05-29 | 2006-06-13 | 데구사 아게 | Oxidatively aftertreated carbon black |
| CN201842796U (en) * | 2010-10-22 | 2011-05-25 | 安徽省勇锋化工有限责任公司 | Carbon black ozone-oxidizing device |
| CN102585565A (en) * | 2012-03-19 | 2012-07-18 | 苏州宝化炭黑有限公司 | Method and device for manufacturing carbon black pigment |
-
2017
- 2017-01-23 KR KR1020170010337A patent/KR20180087492A/en not_active Application Discontinuation
-
2018
- 2018-01-22 CN CN201810059141.9A patent/CN108342100B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100588792B1 (en) * | 1998-05-29 | 2006-06-13 | 데구사 아게 | Oxidatively aftertreated carbon black |
| CN201842796U (en) * | 2010-10-22 | 2011-05-25 | 安徽省勇锋化工有限责任公司 | Carbon black ozone-oxidizing device |
| CN102585565A (en) * | 2012-03-19 | 2012-07-18 | 苏州宝化炭黑有限公司 | Method and device for manufacturing carbon black pigment |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20180087492A (en) | 2018-08-02 |
| CN108342100A (en) | 2018-07-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108342100B (en) | Carbon black oxidation process | |
| US7758928B2 (en) | Functionalisation of particles | |
| KR102444776B1 (en) | Method for oxidizing carbon black and preparing carbon black using the same | |
| CN1129479C (en) | A photocatalyst | |
| CN102895871A (en) | Exhaust gas purifying device | |
| CN104492213A (en) | Tyre waste gas treating process and device thereof | |
| CN112159011A (en) | Advanced oxidation system of ultraviolet/ozone coupling catalyst and sewage treatment process | |
| CN1218770A (en) | Light oxidation equipment and method for water treatment system of semiconductor device | |
| CN205340517U (en) | High -efficient low temperature plasma equipment | |
| CN112154126A (en) | Ballast water treatment equipment and ballast water treatment system | |
| CN1867398A (en) | Fonctionalisation of particles | |
| US20120234769A1 (en) | Systems and methods for treating fluid media using nonthermal plasmas | |
| CN112409836A (en) | Photocatalytic antibacterial coating and preparation device thereof | |
| CN107213884A (en) | A kind of method that utilization plasma technique strengthens metal oxide | |
| CN107555416A (en) | The method of hydro-thermal method synthetic nitrogen doping fluorescent carbon point | |
| US7837952B2 (en) | System and method for removal of hydrogen peroxide from a contaminated media | |
| CN111569642B (en) | Method for removing volatile organic pollutants in air by vacuum ultraviolet light catalytic oxidation | |
| CN106396223A (en) | Treatment process for phenolic water | |
| CN110539417A (en) | Rubber particle production process | |
| CN114345386A (en) | Catalyst loading device for degrading high molecular organic compound by electron beam irradiation | |
| CN115259485B (en) | Lithium battery electrolyte production wastewater treatment and resource recovery method | |
| TWI532682B (en) | System for removing hydrogen peroxide from ammonia-nitrogen wastewater and the method thereof | |
| CN113413835B (en) | Normal-pressure plasma fluidized bed device without inner electrode and application thereof | |
| KR101574675B1 (en) | VOCs-Treating Apparatus Using Low Temperature Catalyst | |
| CN209333498U (en) | A kind of Environmental-protecting treater |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |