CN115491053B - Process for producing carbon black with low polycyclic aromatic hydrocarbon - Google Patents
Process for producing carbon black with low polycyclic aromatic hydrocarbon Download PDFInfo
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- CN115491053B CN115491053B CN202211248584.5A CN202211248584A CN115491053B CN 115491053 B CN115491053 B CN 115491053B CN 202211248584 A CN202211248584 A CN 202211248584A CN 115491053 B CN115491053 B CN 115491053B
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- carbon black
- polycyclic aromatic
- aromatic hydrocarbon
- reaction furnace
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- 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
- C09C1/50—Furnace black ; Preparation thereof
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- 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
-
- 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
- C09C1/58—Agglomerating, pelleting, or the like by wet methods
Abstract
The invention discloses a method for producing carbon black with low polycyclic aromatic hydrocarbon, which comprises the following steps: fuel oil and reaction gas are sprayed into the reaction furnace from two sides of the reaction furnace along the radial direction of the reaction furnace and burnt, so that a high-temperature environment is provided; spraying raw oil into a throat section of the reaction furnace along the axial direction of the reaction furnace for cracking in the high-temperature environment to obtain carbon black smoke; performing water spraying and cooling treatment on the carbon black smoke to obtain carbon black; performing gas-solid separation on the carbon black subjected to cooling treatment to obtain carbon black powder; wet granulating the carbon black powder by a wet granulator to obtain granular carbon black; and (3) carrying out thermal desorption treatment on the polycyclic aromatic hydrocarbon in the granular carbon black by using a roller dryer. The invention ensures that the carbon black production reaction is complete and the produced carbon black has low polycyclic aromatic hydrocarbon content.
Description
Technical Field
The invention relates to the field of carbon black production, in particular to a method for producing carbon black with low polycyclic aromatic hydrocarbon.
Background
With the increasing environmental awareness of humans, there is an increasing demand for environment and health, and in recent years, the EU and China have begun to have strict restrictions on the polycyclic aromatic hydrocarbon content of tires or rubber products, such as rubber sports equipment, furniture items, tools, clothing and other consumer products as well as toys and children's products. Mainly because benzopyrene in polycyclic aromatic hydrocarbons is a strong carcinogen. Polycyclic aromatic hydrocarbons are hydrocarbons containing more than two benzene rings in the molecule, and include 150 kinds of compounds such as naphthalene, anthracene, phenanthrene, pyrene, and the like. English is called polycyclic aromatic hydrocarbon, PAHs for short. Some polycyclic aromatic hydrocarbons also contain nitrogen, sulfur and cyclopentane, and most common polycyclic aromatic hydrocarbons with carcinogenesis are fused ring compounds of four to six rings.
In the filler of the rubber product, the carbon black is the raw material with the largest content of polycyclic aromatic hydrocarbon and benzopyrene, the aggregate form of the carbon black is a nano structure, and the polycyclic aromatic hydrocarbon content of the rubber product is directly influenced. And polycyclic aromatic hydrocarbons in the carbon black are produced in the production process of the carbon black from raw oil.
In the traditional furnace carbon black production process, air and fuel oil are combusted to generate high-temperature flue gas which is axially sprayed into a reaction furnace; spraying raw oil radially into a throat section, rapidly cracking to generate carbon black, then cracking the raw oil into carbon black smoke in a reaction furnace in a high-temperature atmosphere, and spraying water into a quenching section to generate carbon black; heat exchange of the high-temperature air preheater; collecting by a main bag filter; granulating by a wet method and drying by a roller type; and (5) packaging the finished product and delivering the finished product out of the warehouse. Therefore, the injection amount of the fuel oil is limited, the contact combustion of the fuel oil and oxygen is limited, and therefore, enough high-temperature environment cannot be well provided, and the radial injection of the raw oil cannot well enable the raw oil to be fully cracked to generate carbon black, so that a large amount of polycyclic aromatic hydrocarbons are easy to generate, the polycyclic aromatic hydrocarbon content fluctuates between 50 ppm and 500ppm, and the requirements of special clients cannot be met.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person of ordinary skill in the art.
Disclosure of Invention
The invention aims to provide a method for producing carbon black with low polycyclic aromatic hydrocarbon, which can effectively alleviate the problem of insufficient carbon black reaction.
To achieve the above object, an embodiment of the present invention provides a method for producing carbon black with low polycyclic aromatic hydrocarbon, comprising the steps of: fuel oil and reaction gas (oxygen-enriched air, oxygen content more than 21%) are injected into the reaction furnace along the radial direction of the reaction furnace from two sides of the reaction furnace and combusted, so as to provide a high-temperature environment; under the high-temperature environment, spraying the raw oil into a throat section of a reaction furnace along the axial direction of the reaction furnace to carry out incomplete cracking reaction of the raw oil, so as to obtain carbon black smoke; spraying deionized water (the potassium ion content is controlled within 20 ppm) to the carbon black flue gas at a position close to an air preheater for cooling treatment, so that the carbon black reaction time is prolonged, 18 carbon black powder carbon black with low polycyclic aromatic hydrocarbon content is obtained, the polycyclic aromatic hydrocarbon content is 10-30ppm, and the spraying direction of the cooling water is consistent with the flow direction of the carbon black flue gas; carrying out gas-solid separation treatment on the carbon black containing the flue gas after cooling treatment to obtain carbon black powder; carrying out wet granulation on the carbon black powder by using a wet granulator to obtain granular carbon black; and carrying out thermal desorption treatment on the polycyclic aromatic hydrocarbon in the granular carbon black by using a variable-frequency roller dryer.
In one or more embodiments of the present invention, the water spray cooling process includes: and (3) spraying cooling water along the axial direction of the reaction furnace to cool the high-temperature carbon black smoke and obtain carbon black.
In one or more embodiments of the present invention, the method further comprises performing gas-solid separation on the carbon black subjected to the water spray cooling treatment by using an air preheater to obtain carbon black powder.
In one or more embodiments of the present invention, the reaction furnace includes a throat section and a residence section, the residence section having a length of 5 to 6 times the length of the throat section.
In one or more embodiments of the invention, the thermal desorption process comprises: the carbon black powder was thermally desorbed at low speed using a variable frequency drum dryer.
In one or more embodiments of the invention, the reaction temperature of the reaction furnace is 1700-1850 ℃.
In one or more embodiments of the invention, the fuel oil comprises heated ethylene tar or anthracene oil.
In one or more embodiments of the present invention, the carbon black production process of the present invention further comprises transferring the pelletized carbon black after the drum dryer treatment to a designated location using a lift and packaging the carbon black.
Compared with the prior art, the method for producing the carbon black with low polycyclic aromatic hydrocarbon according to the embodiment of the invention has the following advantages:
1. by spraying fuel oil and reaction gas in the radial direction and spraying raw oil in the axial direction, the combustion temperature is higher, the carbon black reaction of the raw oil is more sufficient, and the produced carbon black has low polycyclic aromatic hydrocarbon content.
2. And the cooling section is subjected to water spraying and cooling treatment, so that the carbon black reaction is more complete, and the generated carbon black can be effectively prevented from excessively reacting to generate other substances.
3. The stay section extension sets up for the carbon black flue gas has more time and space to evaporate in stay section, can guarantee the continuity of carbon black production, also can prevent to cause to stay section jam.
4. The wet drying and the roller drying are carried out on the carbon black by using the wet drying machine and the roller drying machine, a frequency conversion mechanism is added to the wet drying machine and the roller drying machine, and the rotating speed of the drying machine is reduced when the carbon black is dried, so that the separation and the thermal desorption of the polycyclic aromatic hydrocarbon on the surface of the carbon black are ensured to be faster, and the polycyclic aromatic hydrocarbon content of the carbon black is further reduced.
Drawings
FIG. 1 is a process flow diagram of a method for producing carbon black with low polycyclic aromatic hydrocarbons according to one embodiment of the invention;
fig. 2 is a schematic view of an apparatus structure of a method for producing carbon black having low polycyclic aromatic hydrocarbons according to an embodiment of the present invention.
The main reference numerals illustrate:
1. a reaction furnace; 11. a raw oil inlet; 12. a combustion inlet; 13. a throat section; 14. a quenching section; 15. a cooling section; 14-1, a first quench location; 14-2, a second quench location; 16. a stay section; 2. an air preheater; 3. a wet granulator; 4. a drum dryer; 5. and (5) a lifting machine.
Detailed Description
The following detailed description of embodiments of the invention is, therefore, to be taken in conjunction with the accompanying drawings, and it is to be understood that the scope of the invention is not limited to the specific embodiments.
Throughout the specification and claims, unless explicitly stated otherwise, the term "comprise" or variations thereof such as "comprises" or "comprising", etc. will be understood to include the stated element or component without excluding other elements or components.
A method for producing carbon black of low polycyclic aromatic hydrocarbon according to a preferred embodiment of the present invention will be described in detail with reference to fig. 1 and 2. The production method comprises the following steps:
fuel oil and reaction gas are injected into the reaction furnace 1 from two sides of the reaction furnace 1 along the radial direction of the reaction furnace and combusted, thereby providing a high-temperature environment. Wherein preferably the fuel oil comprises heated ethylene tar or anthracene oil. Specifically, the reaction temperature of the reaction furnace 1 is 1750-1900 ℃. The reaction gas is oxygen-enriched air, and the oxygen content of the oxygen-enriched air is more than or equal to 21 percent.
Under the high-temperature environment, spraying raw oil into the throat section 13 of the reaction furnace 1 along the axial direction of the reaction furnace for cracking to obtain carbon black smoke;
then, carrying out water spraying and cooling treatment on the carbon black smoke to obtain carbon black, preventing excessive reaction of the carbon black and reducing the generation of polycyclic aromatic hydrocarbon in the carbon black;
then, carrying out gas-solid separation on the carbon black subjected to cooling treatment to obtain carbon black powder, wherein the process is conducive to the emission of polycyclic aromatic hydrocarbon in the carbon black;
wet granulating the carbon black powder by a wet granulator 3 to obtain granular carbon black; the thermal desorption treatment of the polycyclic aromatic hydrocarbon in the granular carbon black is carried out by the roller dryer 4, which is helpful for the emission of the polycyclic aromatic hydrocarbon in the carbon black.
In one embodiment, the water spray cooling process includes: and (3) spraying cooling water along the axial direction of the reaction furnace 1 to cool the high-temperature carbon black smoke and obtain carbon black. Specifically, the cooling water is deionized water, and the potassium ion content of the cooling water is controlled below 20 ppm).
In one embodiment, the air preheater 2 is used for carrying out gas-solid separation on the carbon black subjected to water spraying cooling treatment to obtain carbon black powder, wherein the air preheater 2 is connected with the reaction furnace 1 through a pipe. Specifically, the air preheater is internally provided with a filter for filtering the carbon black after cooling treatment, so as to realize gas-solid separation.
The thermal desorption treatment includes: the carbon black powder was thermally desorbed at a low speed using a variable frequency drum dryer 4. The content of 18 polycyclic aromatic hydrocarbons in the carbon black after thermal desorption treatment is 10-30ppm.
The carbon black producing method of the present invention further comprises transferring the granular carbon black treated by the drum dryer 4 to a specified position by using the elevator 5, and packaging the carbon black.
As shown in fig. 2, the reaction furnace 1 is arranged in a bedroom form, and the reaction furnace 1 of the present invention includes: a combustion inlet 12, a raw material inlet 11, a throat section 13, a quench section 14 and a residence section 16. The combustion inlets 12 are arranged at both sides of the reaction furnace 1, and fuel oil and oxygen-enriched air are fully combusted in the reaction furnace 1 by injecting the fuel oil and the oxygen-enriched air into the combustion inlets 12, so that a high-temperature environment is provided for the fission of carbon black, and the temperature is generally 1700-2300 ℃.
The raw material inlet 11 is used for delivering raw material oil to the throat section 13, and in the throat section 13, the raw material oil undergoes a carbon black reaction in a high-temperature environment to generate carbon black smoke.
Quench water 15 is connected to quench section 14, and the direction of spraying quench water 15 is the same as the direction of carbon black flue gas flow. Quench water 15 provides cooling water for the cooling of the carbon black flue gas to terminate the carbon black overreaction. The quench water is deionized water, and the potassium ion content is within 20 ppm. Simultaneously, the reaction of the carbon black is more complete, the surface of the carbon black is cleaner, and the content of polycyclic aromatic hydrocarbon in the carbon black is reduced. Specifically, as shown in FIG. 2, the system further includes a first quench location 14-1 and a second quench location 14-2, the first extreme cold location 14-1 being located at an inlet end of the quench section 14 and the second extreme cold location 14-2 being located at an outlet end of the quench section 14. And 18 samples of polycyclic aromatic hydrocarbon content were taken at the first quench section 14-1 and the second quench section 14-2 without subsequent content determination.
The length of the stay section 16 is longer, typically 5-6 times the length of the throat section 13. The length of the stay section 16 is prolonged, so that more time and thermal environment space are reserved for vaporizing the carbon black, the air preheater 2 is prevented from being blocked, and the continuity of carbon black production is ensured.
And filtering and collecting gas-solid separation is carried out on the carbon black subjected to water spraying and cooling treatment by using an air preheater 2 through a main bag filter, so as to obtain carbon black powder.
The carbon black powder collected by filtration is thermally desorbed at a low speed by using a variable frequency drum dryer 4, and the rotational speed of the drum is controlled to rotate at a low speed. The carbon black powder can be fully contacted with the thermal environment in the roller, so that the polycyclic aromatic hydrocarbon can be thermally desorbed with the carbon black powder as much as possible, and the content of the polycyclic aromatic hydrocarbon in the carbon black can be further reduced. The content is controlled below 30ppm.
The granular carbon black treated by the roller dryer 4 is transferred to a designated position by a lifter 5, and the carbon black is subjected to a packaging treatment.
The following is a method for measuring 18 polycyclic aromatic hydrocarbon contents at different temperatures (1700 ℃, 1750 ℃, 1800 ℃, 1850 ℃) at the first quenching position 14-1 and the second quenching position 14-2, specifically as follows:
500 ml of the sample was taken and dissolved in 20 ml of toluene solution, followed by extraction in an ultrasonic water bath at 60℃for 1 hour, and then quantification was performed using a sim method using a gas chromatograph.
The 18 polycyclic aromatic hydrocarbon contents at different positions are shown in the following table:
the foregoing descriptions of specific exemplary embodiments of the present invention are presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain the specific principles of the invention and its practical application to thereby enable one skilled in the art to make and utilize the invention in various exemplary embodiments and with various modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.
Claims (6)
1. A method for producing carbon black with low polycyclic aromatic hydrocarbon, comprising the steps of:
fuel oil and reaction gas are sprayed into the reaction furnace from two sides of the reaction furnace along the radial direction of the reaction furnace and burnt, so that a high-temperature environment is provided;
spraying raw oil into a throat section of the reaction furnace along the axial direction of the reaction furnace for cracking in the high-temperature environment to obtain carbon black smoke;
spraying water to cool the carbon black smoke at a position close to an air preheater, wherein the temperature of the cooling treatment is 850-950 ℃, so as to obtain carbon black containing the smoke;
performing gas-solid separation on the carbon black subjected to cooling treatment to obtain soft carbon black powder;
wet granulating the carbon black powder by a wet granulator to obtain granular carbon black;
thermally desorbing polycyclic aromatic hydrocarbon in the granular carbon black by a roller dryer, which comprises thermally desorbing carbon black powder at a low speed by using a variable frequency roller dryer;
wherein the fuel oil comprises heated ethylene tar or anthracene oil, the reaction gas is oxygen-enriched air, the oxygen content of the oxygen-enriched air is more than or equal to 21 percent,
the reaction furnace comprises a throat section and a stay section, wherein the length of the stay section is 5-6 times of that of the throat section.
2. The method for producing carbon black with low polycyclic aromatic hydrocarbon according to claim 1, wherein the water spray cooling treatment comprises:
and spraying cooling water along the axial direction of the reaction furnace to cool the high-temperature carbon black smoke and obtain carbon black, wherein the cooling water comprises deionized water, and the spraying direction of the cooling water is consistent with the flow direction of the carbon black smoke.
3. The method for producing carbon black having a low polycyclic aromatic hydrocarbon according to claim 2, further comprising subjecting the carbon black subjected to the water spray cooling treatment to gas-solid separation using an air preheater to obtain carbon black powder.
4. The method for producing carbon black having a low polycyclic aromatic hydrocarbon according to claim 1, wherein the reaction temperature of the reaction furnace is 1700 to 1850 ℃.
5. The method for producing carbon black having low polycyclic aromatic hydrocarbon content according to claim 1, wherein 18 polycyclic aromatic hydrocarbon contents in the carbon black after thermal desorption treatment are 10 to 30ppm.
6. The method for producing low polycyclic aromatic hydrocarbon carbon black according to claim 1, further comprising transferring the granulated carbon black treated by the drum dryer to a specified position by using a lifter, and packaging the carbon black.
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| CN202211248584.5A CN115491053B (en) | 2022-10-12 | 2022-10-12 | Process for producing carbon black with low polycyclic aromatic hydrocarbon |
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| CN202211248584.5A CN115491053B (en) | 2022-10-12 | 2022-10-12 | Process for producing carbon black with low polycyclic aromatic hydrocarbon |
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| CN115491053B true CN115491053B (en) | 2023-10-03 |
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| CN115160830A (en) * | 2022-08-05 | 2022-10-11 | 安徽鑫唯橡胶制品有限公司 | Production method of fine grinding carbon black with low content of polycyclic aromatic hydrocarbon |
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| US3990854A (en) * | 1973-04-16 | 1976-11-09 | Continental Carbon Company | Apparatus for the manufacture of carbon black |
| CN1038293A (en) * | 1989-05-02 | 1989-12-27 | 化学工业部炭黑工业研究设计所 | Dual-purpose reaction furnace for producing soft/hard carbon black and methods involving |
| JP2009167288A (en) * | 2008-01-16 | 2009-07-30 | Asahi Carbon Kk | Carbon black production apparatus |
| CN204981726U (en) * | 2015-07-07 | 2016-01-20 | 万达集团股份有限公司 | Novel black reactor |
| CN106084898A (en) * | 2016-06-21 | 2016-11-09 | 朝阳黑猫伍兴岐炭黑有限责任公司 | A kind of white carbon black reaction unit |
| CN108774415A (en) * | 2018-07-20 | 2018-11-09 | 宁波德泰化学有限公司 | A kind of manufacturing method of energy conservation and environmental protection carbon black |
| CN114110577A (en) * | 2021-10-19 | 2022-03-01 | 唐山黑猫炭黑有限责任公司 | Automatic switching device for fuel oil production from carbon black |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10318527A1 (en) * | 2003-04-24 | 2004-11-18 | Degussa Ag | Process for the production of furnace carbon black |
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- 2022-10-12 CN CN202211248584.5A patent/CN115491053B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3990854A (en) * | 1973-04-16 | 1976-11-09 | Continental Carbon Company | Apparatus for the manufacture of carbon black |
| CN1038293A (en) * | 1989-05-02 | 1989-12-27 | 化学工业部炭黑工业研究设计所 | Dual-purpose reaction furnace for producing soft/hard carbon black and methods involving |
| JP2009167288A (en) * | 2008-01-16 | 2009-07-30 | Asahi Carbon Kk | Carbon black production apparatus |
| CN204981726U (en) * | 2015-07-07 | 2016-01-20 | 万达集团股份有限公司 | Novel black reactor |
| CN106084898A (en) * | 2016-06-21 | 2016-11-09 | 朝阳黑猫伍兴岐炭黑有限责任公司 | A kind of white carbon black reaction unit |
| CN108774415A (en) * | 2018-07-20 | 2018-11-09 | 宁波德泰化学有限公司 | A kind of manufacturing method of energy conservation and environmental protection carbon black |
| CN114110577A (en) * | 2021-10-19 | 2022-03-01 | 唐山黑猫炭黑有限责任公司 | Automatic switching device for fuel oil production from carbon black |
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