WO2010029895A1 - 黒鉛電極用ニードルコークスの製造方法及びこれに用いる原料油組成物 - Google Patents
黒鉛電極用ニードルコークスの製造方法及びこれに用いる原料油組成物 Download PDFInfo
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- WO2010029895A1 WO2010029895A1 PCT/JP2009/065496 JP2009065496W WO2010029895A1 WO 2010029895 A1 WO2010029895 A1 WO 2010029895A1 JP 2009065496 W JP2009065496 W JP 2009065496W WO 2010029895 A1 WO2010029895 A1 WO 2010029895A1
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- Prior art keywords
- aromatic component
- oil composition
- mass
- needle coke
- raw material
- Prior art date
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Classifications
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B57/00—Other carbonising or coking processes; Features of destructive distillation processes in general
- C10B57/005—After-treatment of coke, e.g. calcination desulfurization
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
- C04B35/52—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbon, e.g. graphite
- C04B35/522—Graphite
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B55/00—Coking mineral oils, bitumen, tar, and the like or mixtures thereof with solid carbonaceous material
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B57/00—Other carbonising or coking processes; Features of destructive distillation processes in general
- C10B57/04—Other carbonising or coking processes; Features of destructive distillation processes in general using charges of special composition
- C10B57/045—Other carbonising or coking processes; Features of destructive distillation processes in general using charges of special composition containing mineral oils, bitumen, tar or the like or mixtures thereof
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L9/00—Treating solid fuels to improve their combustion
- C10L9/08—Treating solid fuels to improve their combustion by heat treatments, e.g. calcining
Definitions
- the present invention relates to a raw material oil composition used for producing needle coke for graphite electrodes. Moreover, this invention relates to the method of manufacturing the needle coke for graphite electrodes using the said raw material oil composition.
- Needle coke used for the aggregate of graphite electrodes for electric steelmaking is generally manufactured using petroleum heavy oil or coal tar as a raw material.
- first, coke grains and a binder pitch are blended at a predetermined ratio, heat-combined, and then extruded to produce a raw electrode.
- the raw electrode is fired, graphitized, and then processed to obtain a graphite electrode product.
- the graphite electrode is used under severe conditions such as a high temperature atmosphere, it is desired that the coefficient of thermal expansion (CTE) is low. That is, the smaller the coefficient of thermal expansion, the smaller the electrode consumption during electric steelmaking, and the cost of electric steelmaking can be reduced.
- CTE coefficient of thermal expansion
- Patent Document 1 discloses a method in which an oligomer whose polymerization degree is adjusted is added to a de-QI pitch from which a quinoline insoluble component has been substantially removed from a coal tar-based raw material, and coke-formed by a delayed coking method as it is. ing.
- Patent Document 2 coal tar heavy oil and petroleum heavy oil are mixed at a ratio of a nitrogen content of 1.0 wt% or less and a sulfur content of 1.4 wt% or less. An oil is prepared, and this raw oil is charged into a delayed coker to produce raw coke.
- the obtained raw coke is calcined in a temperature range of 700 to 900 ° C., cooled once, and then 1200 to 1600 again.
- a method of calcination in the temperature range of ° C. is disclosed.
- Patent Document 3 when producing coal tar by rapid pyrolysis of coal, the thermal decomposition temperature in the reaction furnace is kept at 750 ° C. or higher, and the residence time of the thermal decomposition product in the reaction furnace is 5
- a method is disclosed in which a liquid product is obtained by setting it to a second or less, and the liquid product or pitch contained therein is carbonized.
- Patent Document 4 a petroleum heavy oil alone or a mixture of a coal heavy heavy oil from which a quinoline insoluble component has been removed in advance is subjected to delayed coking as a raw material oil, needle coke.
- a method of using a petroleum heavy oil that has been adjusted in advance so that the content of particles such as ash is in the range of 0.05 to 1% by weight is disclosed.
- graphite electrodes used for electric steelmaking are used under severe conditions such as high-temperature atmospheres, so that they are highly consumed, and the demand and production of steel are increasing year by year.
- a graphite electrode with low heat consumption and high thermal shock resistance is desired.
- the main cause of consumption of the graphite electrode is a crack generated by thermal expansion at the time of use at a high temperature of 3000 ° C., and this crack leads to a defect or breakage of the graphite electrode. Therefore, development of needle coke having a smaller thermal expansion coefficient is strongly desired.
- the present invention has been made in view of the above-described problems of the prior art, and an object thereof is to provide a raw material oil composition useful for producing needle coke for graphite electrodes having a sufficiently small thermal expansion coefficient. . Moreover, this invention aims at providing the manufacturing method of the needle coke for graphite electrodes using the said raw material oil composition.
- the present inventors have paid attention to the generation mechanism of needle coke and found that the above-mentioned problems can be solved by making the most of this, and have completed the present invention. That is, in order to produce needle coke for graphite electrodes with low thermal expansion, a good mesophase is generated in the pyrolysis and polycondensation reaction in the coking process of the raw material oil composition, and at the time of bulking and solidification, It is necessary to orient the crystal structure of the bulk mesophase uniaxially by the stress due to moderate gas generation. In the process of producing needle coke for graphite electrodes from a raw material oil composition, control of the composition of the raw material oil composition as a starting material is extremely important in order to produce the above process satisfactorily.
- the present invention is a raw material oil composition for needle coke for graphite electrodes, having a 10 vol% distillation temperature in distillation properties of 280 ° C or higher, and an aromatic component and a non-aromatic component by elution chromatography.
- the aromatic component has a molecular weight of 255 to 1300 and a non-aromatic component of normal paraffin content, with respect to the total mass of the crude oil composition.
- a feedstock composition characterized in that the amount is 5 parts by mass or more with respect to 100 parts by mass of the aromatic component.
- the raw material oil composition of the above composition According to the raw material oil composition of the above composition, a good mesophase is generated in the pyrolysis and polycondensation reaction in the coking process of the raw material oil composition, and due to stress due to appropriate gas generation at the time of bulking and solidification
- the crystal structure of the bulk mesophase can be sufficiently oriented. Therefore, it is possible to obtain needle coke for graphite electrodes having a sufficiently small thermal expansion coefficient.
- 10 vol% distillation temperature in distillation properties means a value measured according to JIS K2254 “Petroleum products—distillation test method”.
- the “elution chromatography method” means a method of separating a raw oil composition into two components (aromatic component and non-aromatic component) based on the method described in ASTM D2549. That is, 8 g of the raw oil composition dissolved in 20 mL of n-pentane or cyclohexane is passed through a column packed with activated alumina and silica gel.
- n-pentane is passed through the column at a rate of 3 mL / min to elute non-aromatic components into n-pentane.
- Non-aromatic components eluted in n-pentane are collected and quantified.
- 100 mL of diethyl ether, 100 mL of chloroform, and 175 mL of ethyl alcohol are sequentially passed through the column at a rate of 3 mL / min to elute the aromatic component in the solvent.
- Aromatic components eluted in the solvent are collected and quantified.
- aromatic component and non-aromatic component with respect to the total mass of a crude oil composition mean the value calculated by following formula (1) and (2), respectively.
- a and B respectively indicate the masses of the aromatic component and the non-aromatic component obtained by the separation treatment by the elution chromatography method.
- Aromatic component (mass%) A / (A + B) ⁇ 100 (1)
- Non-aromatic component (mass%) B / (A + B) ⁇ 100 (2)
- the “molecular weight of the aromatic component” as used in the present invention means a value measured by a vapor pressure equilibrium method. That is, using a molecular weight measuring device (manufactured by Hitachi, model number: 117), using n-cetane as a standard sample with a known molecular weight, dissolving this in cyclohexane and injecting it into the measuring device, the molar concentration and potential difference Create a calibration curve for the relationship. Next, a sample of the aromatic component is measured in the same manner as the standard sample, the molar concentration is obtained from the potential difference, and the average molecular weight is calculated.
- a molecular weight measuring device manufactured by Hitachi, model number: 117
- the amount of normal paraffin contained in the non-aromatic component is preferably 3% by mass or more based on the total mass of the crude oil composition.
- the mesophase is generated in the coking process of the raw material oil composition, it is possible to prevent the matrix viscosity from becoming excessively high and to prevent rapid coalescence.
- the amount of normal paraffin contained in the non-aromatic component means a value measured by a gas chromatograph equipped with a capillary column. Specifically, after testing with a normal paraffin standard substance, the sample of the non-aromatic component separated by the elution chromatography method is passed through a capillary column and measured.
- the present invention also relates to a method for producing needle coke for graphite electrodes, comprising a step of blending two or more kinds of raw oils to prepare the raw oil composition, and the raw oil composition is mixed with a delayed coker from 400 to 400. Coking at 600 ° C and then calcining at 1000-1500 ° C.
- a raw material oil composition useful for producing needle coke for graphite electrodes having a sufficiently small thermal expansion coefficient is provided.
- a graphite electrode having high thermal shock resistance can be obtained by using needle coke having a sufficiently small thermal expansion coefficient as raw coal.
- the 10 vol% distillation temperature in the distillation property is preferably 280 ° C or higher, more preferably 300 ° C or higher, and further preferably 330 ° C or higher.
- Needle coke produced from a feed oil composition having a 10 vol% distillation temperature of less than 280 ° C. tends to have a large thermal expansion coefficient, which is not preferable.
- the reason why the coefficient of thermal expansion is increased is that an isotropic structure called “Non-Mesogen” in which a component having a low molecular weight contained in a fraction having a distillation temperature lower than 280 ° C. does not become mesophase in the coking process.
- a bulk mesophase that wraps the isotropic structure at the time of uniaxial orientation is formed, and this isotropic portion becomes a defect and adversely affects the uniaxial orientation.
- the content of the aromatic component is 30 to 80 mass with respect to the total mass of the crude oil composition.
- the molecular weight of the aromatic component is 255 to 1300, and the normal paraffin content of the non-aromatic component is 5 parts by mass or more with respect to 100 parts by mass of the aromatic component.
- the content of the aromatic component with respect to the total mass of the crude oil composition is 30 to 80% by mass, preferably 35 to 75% by mass, and more preferably 40 to 75% by mass. This condition is essential for the production and growth of a good mesophase.
- the content of the aromatic component is less than 30% by mass, the yield of coke from the feed oil composition becomes extremely low.
- the content of the aromatic component exceeds 80% by mass, a large number of mesophases are suddenly generated in the matrix during the coke production process. Then, coalescence occurs rather than mesophase single growth, which causes deformation of the coke structure and makes it difficult to obtain coke having a low coefficient of thermal expansion (CTE).
- CTE coefficient of thermal expansion
- the molecular weight of the aromatic component is from 255 to 1300, preferably from 270 to 1100, more preferably from 275 to 1000. This condition is essential for the production and growth of a good mesophase. When the molecular weight of the aromatic component is less than 255, the mesophase is not sufficiently generated. On the other hand, when the molecular weight of the aromatic component exceeds 1300, a mesophase is generated early in the coke production process, and coke formation proceeds before it grows to obtain coke having a small structure called mosaic. Such coke has a large coefficient of thermal expansion and is difficult to use as a raw material carbon for graphite electrodes.
- Normal paraffin appropriately contained in the raw material oil composition is effective for orienting crystals in the uniaxial direction when the mesophase is solidified in the coke production process.
- the amount of normal paraffin contained in the non-aromatic component is 5 parts by mass or more and preferably 7 parts by mass or more with respect to 100 parts by mass of the aromatic component.
- the upper limit of the normal paraffin amount based on the mass of the aromatic component is preferably 45 parts by mass, and more preferably 40 parts by mass.
- the amount of normal paraffin exceeds 45 parts by mass, excessive gas generation from normal paraffin tends to work in a direction that disturbs the orientation of the bulk mesophase. Then, the coke structure becomes a fine mosaic structure, and the thermal expansion coefficient increases.
- the amount of normal paraffin contained in the non-aromatic component is preferably 3% by mass or more, and more preferably 10% by mass or more with respect to the total mass of the crude oil composition.
- the upper limit of the normal paraffin amount based on the mass of the raw material oil composition is preferably 30% by mass, and more preferably 25% by mass. Since normal paraffin has a large amount of gasification during coking, when the amount of normal paraffin exceeds 30% by mass, the yield of coke decreases, and it tends to be unsuitable for a production method for commercial production.
- the raw material oil composition according to the present embodiment can be obtained by blending two or more kinds of raw material oils so as to satisfy the above conditions.
- feedstock oil fluidized catalytic cracking oil bottom oil (FCC DO), heavy oil with advanced hydrodesulfurization treatment, vacuum residue (VR), coal liquefied oil, coal solvent extract oil, atmospheric residue Examples thereof include oil shell oil, tar sand bitumen, naphtha tar pitch, coal tar pitch, and heavy oil obtained by hydrorefining these.
- FCC DO fluidized catalytic cracking oil bottom oil
- VR vacuum residue
- coal liquefied oil coal solvent extract oil
- atmospheric residue examples thereof include oil shell oil, tar sand bitumen, naphtha tar pitch, coal tar pitch, and heavy oil obtained by hydrorefining these.
- the blending ratio may be adjusted as appropriate according to the properties of the raw material oil used.
- the properties of the raw material oil vary depending on the type of crude oil and the processing conditions until the raw material oil is obtained from the crude oil
- the delayed coking method is preferred as a method for coking a raw oil composition that satisfies a predetermined condition. More specifically, it is preferable to heat the raw oil composition with a delayed coker under pressure conditions to obtain raw coke, and then calcine the raw coke in a rotary kiln, shaft furnace or the like to obtain needle coke.
- the conditions of the delayed coker are preferably a pressure of 300 to 800 kPa and a temperature of 400 to 600 ° C.
- the calcination temperature is preferably 1000 to 1500 ° C.
- a raw electrode in which an appropriate amount of binder pitch is added to needle coke is heated and mixed, and then extruded to produce a raw electrode.
- the raw electrode is calcined and graphitized, and then processed.
- the raw material oil composition according to the present embodiment is used, it becomes possible to produce needle coke for graphite electrodes having a sufficiently small thermal expansion coefficient.
- the raw oil composition used is separated into an aromatic component and a non-aromatic component by elution chromatography, and the composition of the raw oil composition (the content of the aromatic component, the molecular weight of the aromatic component and the non-aromatic component) By analyzing the normal paraffin content of the component, a feedstock composition suitable for producing needle coke for graphite electrodes having a sufficiently small thermal expansion coefficient can be efficiently selected.
- Examples 1 to 4 and Comparative Examples 1 to 5 Nine kinds of raw material oil compositions were prepared by blending various heavy oils. Nine kinds of raw material oil compositions were separated by elution chromatography and analyzed, the results are shown in Tables 1 and 2. Each raw oil composition was heat treated at 500 ° C. for 3 hours to form raw coke, and the obtained raw coke was fired at 1000 ° C. for 5 hours to obtain calcined coke (needle coke). Tables 1 and 2 show the thermal expansion coefficients of the obtained calcined coke.
- the feedstock compositions of Examples 1 to 4 shown in Table 1 have a 10 vol% distillation temperature in distillation properties of 280 ° C or higher, an aromatic component content of 30 to 80% by mass, and an aromatic composition.
- the molecular weight of the component is 255 to 1300, and the normal paraffin content of the non-aromatic component is 5 parts by mass or more with respect to 100 parts by mass of the aromatic component.
- Calcined coke (needle coke) obtained from these raw oil compositions has a thermal expansion coefficient of 1.1 to 1.3 ⁇ 10 ⁇ 6 / ° C., and the raw materials of Comparative Examples 1 to 5 shown in Table 2 It was a small value compared with that of the oil composition.
- a raw material oil composition useful for producing needle coke for graphite electrodes having a sufficiently small thermal expansion coefficient is provided.
- a graphite electrode having high thermal shock resistance can be obtained by using needle coke having a sufficiently small thermal expansion coefficient as raw coal.
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Abstract
Description
芳香族成分(質量%)=A/(A+B)×100 …(1)
非芳香族成分(質量%)=B/(A+B)×100 …(2)
各種重質油をブレンドして9種類の原料油組成物を調製した。9種類の原料油組成物を溶出クロマトグラフィー法によってそれぞれ分離し、分析した結果を表1,2に示す。また、各原料油組成物を500℃で3時間熱処理を行い生コークス化し、得られた生コークスを1000℃で5時間焼成してか焼コークス(ニードルコークス)を得た。得られたか焼コークスの熱膨張係数を表1,2に示す。
Claims (3)
- 黒鉛電極用ニードルコークスの原料油組成物であって、
蒸留性状における10容量%留出温度が280℃以上であり、溶出クロマトグラフィー法によって芳香族成分と非芳香族成分とに分離されたとき、当該原料油組成物の全質量に対する前記芳香族成分の含有量が30~80質量%であり且つ前記芳香族成分の分子量が255~1300であるとともに、前記非芳香族成分のノルマルパラフィン含有量が前記芳香族成分100質量部に対して5質量部以上であることを特徴とする原料油組成物。 - 前記非芳香族成分に含まれるノルマルパラフィンの量は、当該原油組成物の全質量に対して3質量%以上であることを特徴とする、請求項1に記載の原料油組成物。
- 黒鉛電極用ニードルコークスの製造方法であって、
2種類以上の原料油をブレンドして請求項1又は2に記載の原料油組成物を調製する工程と、
当該原料油組成物をディレードコーカーで400~600℃でコーキングし、次いで1000~1500℃でか焼する工程と、
を備えることを特徴とする方法。
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2010528712A JP5298131B2 (ja) | 2008-09-09 | 2009-09-04 | 黒鉛電極用ニードルコークスの製造方法及びこれに用いる原料油組成物 |
EP09813041.2A EP2336267B1 (en) | 2008-09-09 | 2009-09-04 | Process for producing needle coke for graphite electrode and stock oil composition for use in the process |
MX2011002442A MX2011002442A (es) | 2008-09-09 | 2009-09-04 | Proceso para producir coque cristalizado en agujas para electrodos de grafito y una composicion de aceite base para utilizarse en el proceso. |
KR1020117006287A KR101433694B1 (ko) | 2008-09-09 | 2009-09-04 | 흑연 전극용 니들 코크스의 제조 방법 및 이것에 사용하는 원료유 조성물 |
US13/062,106 US8715484B2 (en) | 2008-09-09 | 2009-09-04 | Process for producing needle coke for graphite electrode and stock oil composition for use in the process |
CN2009801351623A CN102149791B (zh) | 2008-09-09 | 2009-09-04 | 石墨电极用针状焦的制造方法以及用于其的原料油组合物 |
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JP2008231024 | 2008-09-09 | ||
JP2008-231024 | 2008-09-09 |
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US (1) | US8715484B2 (ja) |
EP (1) | EP2336267B1 (ja) |
JP (1) | JP5298131B2 (ja) |
KR (1) | KR101433694B1 (ja) |
CN (1) | CN102149791B (ja) |
MX (1) | MX2011002442A (ja) |
WO (1) | WO2010029895A1 (ja) |
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JP5400064B2 (ja) * | 2008-12-26 | 2014-01-29 | Jx日鉱日石エネルギー株式会社 | リチウムイオン二次電池負極材料用の原料油組成物 |
CN111592902B (zh) * | 2020-05-22 | 2021-05-28 | 中国石油大学(华东) | 一种重质油制备超高功率电极用针状焦的方法 |
CN111575036B (zh) * | 2020-05-22 | 2021-05-28 | 中国石油大学(华东) | 一种重质油体积排阻分离-分级炭化制备优质针状焦的方法 |
KR102657635B1 (ko) * | 2021-08-12 | 2024-04-16 | 재단법인 포항산업과학연구원 | 침상 코크스 전구체 조성물 |
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- 2009-09-04 WO PCT/JP2009/065496 patent/WO2010029895A1/ja active Application Filing
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Publication number | Publication date |
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EP2336267A4 (en) | 2014-06-04 |
EP2336267B1 (en) | 2017-04-05 |
CN102149791A (zh) | 2011-08-10 |
JPWO2010029895A1 (ja) | 2012-02-02 |
MX2011002442A (es) | 2011-05-19 |
KR101433694B1 (ko) | 2014-08-25 |
US8715484B2 (en) | 2014-05-06 |
EP2336267A1 (en) | 2011-06-22 |
JP5298131B2 (ja) | 2013-09-25 |
CN102149791B (zh) | 2013-06-12 |
KR20110066146A (ko) | 2011-06-16 |
US20110186478A1 (en) | 2011-08-04 |
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