US20040005254A1 - Reactor for producing a nitrile compound and method for operating the reactor - Google Patents

Reactor for producing a nitrile compound and method for operating the reactor Download PDF

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Publication number
US20040005254A1
US20040005254A1 US10/326,056 US32605602A US2004005254A1 US 20040005254 A1 US20040005254 A1 US 20040005254A1 US 32605602 A US32605602 A US 32605602A US 2004005254 A1 US2004005254 A1 US 2004005254A1
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Prior art keywords
cooling
reactor
catalyst bed
cooling tubes
fluidized catalyst
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US10/326,056
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English (en)
Inventor
Shuichi Ueno
Takuji Shitara
Kenichi Nakamura
Fumisada Kosuge
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Mitsubishi Gas Chemical Co Inc
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Mitsubishi Gas Chemical Co Inc
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Priority claimed from JP2001391957A external-priority patent/JP4054960B2/ja
Priority claimed from JP2001391956A external-priority patent/JP4054959B2/ja
Application filed by Mitsubishi Gas Chemical Co Inc filed Critical Mitsubishi Gas Chemical Co Inc
Assigned to MITSUBISHI GAS CHEMICAL COMPANY, INC. reassignment MITSUBISHI GAS CHEMICAL COMPANY, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KOSUGE, FUMISADA, NAKAMURA, KENICHI, SHITARA, TAKUJI, UENO, SHUICHI
Publication of US20040005254A1 publication Critical patent/US20040005254A1/en
Priority to US10/940,652 priority Critical patent/US7371882B2/en
Abandoned legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D13/00—Heat-exchange apparatus using a fluidised bed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
    • B01J8/005—Separating solid material from the gas/liquid stream
    • B01J8/0055—Separating solid material from the gas/liquid stream using cyclones
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
    • B01J8/18—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles
    • B01J8/1836—Heating and cooling the reactor
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C253/00—Preparation of carboxylic acid nitriles
    • C07C253/24—Preparation of carboxylic acid nitriles by ammoxidation of hydrocarbons or substituted hydrocarbons
    • C07C253/28—Preparation of carboxylic acid nitriles by ammoxidation of hydrocarbons or substituted hydrocarbons containing six-membered aromatic rings, e.g. styrene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2208/00—Processes carried out in the presence of solid particles; Reactors therefor
    • B01J2208/00008—Controlling the process
    • B01J2208/00017—Controlling the temperature
    • B01J2208/00106—Controlling the temperature by indirect heat exchange
    • B01J2208/00115—Controlling the temperature by indirect heat exchange with heat exchange elements inside the bed of solid particles
    • B01J2208/00132—Tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2208/00—Processes carried out in the presence of solid particles; Reactors therefor
    • B01J2208/00008—Controlling the process
    • B01J2208/00725—Mathematical modelling

Definitions

  • the present invention relates to a reactor for producing a carbon ring nitrile compound or a heterocyclic nitrile compound by ammoxidation of a carbon ring compound or a heterocyclic compound having organic substituents with ammonia and a gas containing oxygen in accordance with the gas phase reaction using a fluidized catalyst bed.
  • Carbon ring nitrile compounds are useful as raw materials for synthetic resins and agricultural chemicals and as intermediate compounds for amines and isocyanates.
  • Heterocyclic nitrile compounds are useful as intermediate compounds for drugs, additives for feedstuffs and additives for foods.
  • ammoxidation The process of reacting an organic compound such as carbon ring compounds and heterocyclic compounds having organic substituents with ammonia and a gas containing oxygen is called ammoxidation and, in general, nitrile compounds are produced by a gas phase reaction using a fluidized catalyst.
  • the distribution of the temperature in the fluidized bed is kept approximately uniform when the fluidized condition within the bed is excellent.
  • the distribution of the temperature is frequently not uniform when the reaction is a rapid exothermic reaction such as ammoxidation and a cooling tube is disposed for removal of heat.
  • the amount of heat generation per the unit volume of the fluidized bed (the density of heat generation) is great and the heat capacity of the catalyst particles is relatively small in comparison with the heat capacity of the gas phase
  • the distribution of the temperature is markedly uneven in an apparatus of the industrial scale having a fluidized bed and a column having a diameter exceeding 2 m.
  • drawbacks such as a decrease in the conversion and formation of byproducts arise at portions where the temperature is not optimum.
  • the present invention has an object of providing, in the industrial production of a nitrile compound by ammoxidation using a gas phase reactor using a fluidized catalyst bed, a reactor which provides a uniform distribution of the temperature in the fluidized catalyst bed, enables the reaction to proceed in the optimum manner, easily stabilizes the temperature of the reaction and enables the continuous operation for a long time and providing a method for operating the reactor.
  • the present invention provides a reactor for producing a nitrile compound and a method for operating the reactor described in the following.
  • a reactor for producing a nitrile compound from a carbon ring compound having organic substituents or a heterocyclic compound having organic substituents by a gas phase reaction using a fluidized catalyst bed with ammonia and a gas containing oxygen comprising cooling tubes which are disposed in a cylindrical fluidized catalyst bed having a diameter of 2.0 meters or greater and comprise cooling tubes of a partial vaporization type in which a portion of a cooling medium is vaporized in the tubes and cooling tubes of a complete vaporization type in which an entire cooling medium is vaporized in the cooling tubes.
  • AF (m 2 ) an area of a horizontal section of a flow route of the fluidized catalyst bed
  • LW (m) a length of circumferences where the horizontal section of the flow route contacts the fluidized catalyst bed (a circumferential length of dipping).
  • S1 represents an entire surface area of the cooling tubes existing in a vertical cylinder having, in an region in the fluidized catalyst bed where the cooling tubes exist, a bottom face as an arbitrary horizontal section of the region and an arbitrary height;
  • S2 represents a surface area of cooling tubes in use existing in a vertical cylinder having a bottom face as a circular section which is present in a same plane as that of the bottom face of the cylinder described for S1 and has a same diameter as the equivalent diameter and a same height as that of the cylinder described for S1.
  • (D) A method for operating a reactor for producing a nitrile compound which comprises using water having a concentration of ionic SiO 2 of 0.1 ppm or smaller and an electric conductivity of 5 ⁇ S/cm or smaller as a cooling medium supplied to a cooling tube of a complete vaporization type in the reactor for producing a nitrile compound described in (A).
  • FIG. 1 shows a diagram describing an example of the structure of the reactor for producing a nitrile compound of the present invention.
  • FIG. 2 shows a diagram describing the equivalent diameter DE in (B).
  • FIG. 3 shows a diagram describing the ratio (S2/S1) of the surface areas of cooling tubes in (C).
  • FIG. 4 shows a diagram exhibiting the arrangement of cooling tubes in (B) and (C).
  • FIG. 5 shows a diagram exhibiting the arrangement of thermometers in Example 1 and Comparative Example 3.
  • 1 means a reactor for producing a nitrile compound
  • 2 means a fluidized catalyst
  • 3 means an inlet for a gas containing oxygen
  • 4 means a disperser for the gas containing oxygen
  • 5 means an inlet for a carbon ring compound or a heterocyclic compound having organic substituents of the raw material and ammonia
  • 6 means a cooling tube
  • 7 means a cyclone for separating the catalyst
  • 8 means a tube for returning the catalyst
  • 9 means a tube for discharging the reaction gas
  • 10 means the surface of the fluidized catalyst bed.
  • FIG. 1 shows a diagram describing an example of the structure of the reactor for producing a nitrile compound of the present invention.
  • a reactor of ammoxidation 1 is packed with a fluidized catalyst 2 .
  • a gas containing oxygen is introduced at a bottom portion 3 of the reactor and supplied to the reactor via a disperser 4 .
  • a carbon ring or heterocyclic compound having organic substituents of the raw material is supplied at a side portion 5 of a lower portion of the fluidized catalyst bed.
  • a cooling tube 6 is disposed at the inside of the reactor.
  • the surface 10 of the fluidized catalyst bed is placed at a lower portion of an upper portion of the cooling tube.
  • Particles of the catalyst in a reaction gas are separated by a cyclone for the catalyst 7 and returned to the fluidized catalyst bed via a tube for returning the catalyst 8 .
  • the reaction gas from which the particles of the catalyst have been removed is discharged through the tube for discharging the reaction gas 9 at the top of the column.
  • the reaction gas discharged at the top of the column which contained the unreacted carbon ring or heterocyclic compound, the nitrile compound, ammonia, hydrogen cyanide, carbon dioxide, water, carbon monoxide, nitrogen and oxygen is transferred to the next step and the nitrile compound is separated and purified.
  • the present invention relates to a reactor using a fluidized catalyst bed which has a column having a diameter of 2.0 m or greater and cooling tubes for removing heat of ammoxidation at the inside.
  • the reactor is characterized by a specific arrangement of the cooling tubes at the inside of the fluidized catalyst bed and a specific manner of using the cooling tube.
  • a cooling tube of the partial vaporization type in which a portion of a cooling medium is vaporized in the tube and a cooling tube of a complete vaporization type in which an entire cooling medium is vaporized in the cooling tube are used in combination as the cooling tubes in the reactor using the fluidized catalyst bed and having a column having a diameter of 2.0 m or greater.
  • the reaction using the fluidized catalyst bed is a form of reaction suitable for continuing the reaction while the heat generated by an intense exothermic reaction is rapidly removed.
  • cooling tubes are disposed and the heat generated by the exothermic reaction is removed.
  • the type of the cooling tube for removing the heat there are a cooling tube of the partial vaporization type in which a portion of a cooling medium is vaporized in the tube and a cooling tube of a complete vaporization type in which an entire cooling medium is vaporized in the cooling tube.
  • the cooling tube of the partial vaporization type By the cooling tube of the partial vaporization type, a specific amount of heat corresponding to the area of heat transfer dipped into the fluidized catalyst bed is removed. On the other hand, by the cooling tube of the complete vaporization type, the amount of the removed heat varies depending on the amount of the medium supplied to the cooling tube.
  • the distribution of the temperature in the fluidized catalyst bed tends to be fluctuated in an operation not in the steady state such as the operations at the start and at the end and operations with changes in the load when the area of heat transfer per one cooling tube is great.
  • the fluctuation in the distribution of the temperature can be decreased by increasing the number of the cooling tube so that the area of heat transfer per one cooling tube is decreased.
  • the apparatus becomes complicated and is disadvantageous from the standpoint of economy.
  • the cooling tube of the complete vaporization type when used, the amount of the removed heat can be precisely adjusted by controlling the amount of the supplied cooling water and a stable distribution of the temperature can be obtained even during an operation not in the steady state.
  • the reactor is a commercial reactor having a diameter of 2 m or greater and the type of the cooling tube is a widely used vertical cooling tube having the U-shape
  • non-volatile metal components such as silica, alkali metals and alkaline earth metals tend to be precipitated and accumulated at the lower portion of the U-shape.
  • it is impossible that the accumulated substances are blown over the vertical portion of the U-shape and removed during the operation.
  • the efficiency of heat transfer decreases and problems arise due to stress cracking.
  • the operation for a long time becomes difficult.
  • the distribution of the temperature can be made uniform and the control of the temperature can be improved by using the cooling tube of a partial vaporization type in which a portion of a cooling medium is vaporized in the tube and the cooling tube of a complete vaporization type in which an entire cooling medium is vaporized in the cooling tube in combination as the cooling tubes disposed in the fluidized catalyst bed.
  • the cooling tube of the partial vaporization type alone is used, the amount of removed heat changes stepwise since the amount of removed heat cannot be changed gradually and the temperature inside the reactor tends to become unstable although the entire portions of the cooling tubes dipped into the fluidized catalyst bed are effective as the area of heat transfer for cooling.
  • the effective area of heat transfer for cooling is limited to the range from the inlet of cooling water to the portion of the complete vaporization within the entire portions of the cooling tubes dipped into the fluidized catalyst bed and the cooling becomes uneven although the amount of cooling can be changed continuously.
  • the control system is complicated and is disadvantageous from the standpoint of the cost.
  • the arrangements and the relative numbers of the cooling tube of the partial vaporization type and the cooling tube of the complete vaporization type can be suitably selected in accordance with the condition of the operation. It is preferable that (the amount of heat removed by the cooling tube of the complete vaporization type)/(the amount of heat removed by the cooling tube of the partial vaporization type) is in the range of 0.05 to 0.95 and more preferably in the range of 0.3 to 0.95. Controllability of the temperature is improved by using the cooling tube of the partial vaporization type and the cooling tube of the complete vaporization type in combination.
  • the cooling tube there are a horizontal cooling tube and a vertical cooling tube.
  • the horizontal cooling tube is not preferable due to abnormal reactions and vaporization caused by accumulation of the catalyst at an upper portion.
  • a vertical cooling tube having the U-shape is preferable.
  • cooling medium various cooling media may be used as long as the media is vaporized at the temperature of the operation. It is industrially advantageous that water is used.
  • the concentration of ionic silica is the cooling medium is 0.1 ppm or smaller and more preferably 0.05 ppm in accordance with (D). It is also preferable that the electric conductivity of the cooling medium is 5 ⁇ S/cm or smaller and more preferably 3 ⁇ S/cm. Under the above conditions, the decrease in the efficiency of cooling due to accumulation of silica and fracture due to stress cracking can be prevented and the continuous stable operation of the cooling tube of the complete vaporization type can be achieved. When the concentration of ionic silica or the electric conductivity of the cooling medium exceeds the above range, it is difficult that the stable operation is conducted for a long time.
  • an equivalent diameter defined by equation (1) in an arbitrary horizontal section of a region where the cooling tube exists in a straight line shape in the fluidized catalyst bed in the reactor for producing a nitrile compound is in the range of 0.2 to 2.0 m and at least a portion of the cooling tube exists in an arbitrary circle having the same diameter as the equivalent diameter and placed in the section (refer to FIG. 4).
  • AF (m 2 ) an area of a horizontal section of a flow route of the fluidized catalyst bed
  • LW (m) a length of a circumference where the horizontal section of the flow route contacts the fluidized catalyst bed (a circumferential length of dipping) (refer to FIG. 2).
  • the equivalent diameter is related to the diameter of the formed bubble.
  • the equivalent diameter is smaller than 0.2 m, the diameter of the formed bubble is excessively small and the swelling of the bed is excessively great. Therefore, the size of the apparatus increases and the condition is disadvantageous.
  • the equivalent diameter exceeds 2.0 m, the diameter of the formed bubble is excessively great. Therefore, the efficiency of contact between the gas and the catalyst decreases and the condition is disadvantageous
  • the ratio (S2/S1) of a surface area (S2) to a surface area (S1) of the cooling tubes is in the range of 0.01 to 0.30 and preferably in the range of 0.05 to 0.20 (refer to FIG. 3).
  • the areas S1 and S2 are defined in the following:
  • S1 represents the entire surface area of the cooling tubes existing in a vertical cylinder having, in an region in the fluidized catalyst bed where the cooling tubes exist, a bottom face as an arbitrary horizontal section of the region and an arbitrary height;
  • S2 represents the surface area of cooling tubes in use existing in a vertical cylinder having a bottom face as a circular section which is present in the same plane as that of the bottom face of the cylinder described for S1 and has the same diameter as the equivalent diameter and the same height as that of the cylinder described for S1.
  • the carbon ring compound having organic substituents which is used as the raw material for producing the nitrile compound in the present invention is a carbon ring compound having a carbon ring such as benzene ring, naphthalene ring, anthracene ring, cyclohexene ring, cyclohexane ring, dihydronaphthalene ring, tetraline ring and decaline ring and organic substituents such as methyl group, ethyl group, propyl group, formyl group, acetyl group, hydroxymethyl group, methoxycarbonyl group and alkoxyl group as the side chains on the carbon ring.
  • a carbon ring such as benzene ring, naphthalene ring, anthracene ring, cyclohexene ring, cyclohexane ring, dihydronaphthalene ring, tetraline ring and decaline ring
  • the carbon ring compound may further have atoms and groups which do not take part in the ammoxidation such as a halogen group, hydroxyl group, amino group and nitro group.
  • Examples of the carbon ring compound having organic substituents include toluene, xylene, trimethylbenzene, ethylbenzene, methylnaphthalene, dimethyl-naphthalene, methyltetraline, dimethyltetraline, chlorotoluene, dichloro-toluene, methylaniline, cresol and methylanisole.
  • the heterocyclic compound having organic substituents which is used as the raw material is a heterocyclic compound having a heterocyclic ring such as furan ring, pyrrol ring, indole ring, thiophene ring, pyrazole ring, imidazole ring, oxazole ring, pyran ring, pyrdine ring, quinoline ring, isoquinoline ring, pyrrolne ring, pyrrolidine ring, imidazoline ring, imidazolidine ring, piperidine ring and piperadine ring and organic substituents such as those described above as the side chains on the heterocyclic ring.
  • a heterocyclic compound having a heterocyclic ring such as furan ring, pyrrol ring, indole ring, thiophene ring, pyrazole ring, imidazole ring, oxazole ring, pyran ring, pyrdine ring, quinoline
  • the heterocyclic compound may further comprise as the side chains thereof atoms and groups which do not take part in the ammoxidation such as those described above as the side chains.
  • the heterocyclic compound include furfural, 2-methylthiophene, 3-methylthiophene, 2-formylthiophene, 4-methylthiazole, methylpyridine, dimethylpyridine, trimethylpyridine, methylquinoline, methylpyrazine, dimethylpyrazine and methylpiperadine.
  • the above compounds may be used singly or as a mixture of two or more.
  • the catalyst used in the reactor of the present invention is not particularly limited as long as the catalyst is a catalyst of ammoxidation having the properties suitable for the gas phase reaction using a fluidized catalyst such as wear resistance.
  • a fluidized catalyst such as wear resistance.
  • the catalyst include fluidized catalysts comprising an oxide of at least one metal selected from vanadium (V), molybdenum (Mo) and iron (Fe).
  • the particle diameter of the entire catalyst is in the range of 10 to 300 ⁇ m.
  • the average particle diameter is in the range of 30 to 200 ⁇ m and preferably in the range of 40 to 100 ⁇ m.
  • the bulk density of the catalyst is in the range of 0.5 to 2 g/cm 3 and preferably in the range of 0.7 to 1.5 g/cm 3 .
  • the air is used as the gas containing oxygen used for the ammoxidation.
  • the air may be used after the content of oxygen is increased or may be used in combination with a diluent such as nitrogen gas and carbon dioxide gas.
  • the amount of oxygen expressed as the ratio of the amount by mole of oxygen to the amount by mole of the organic substituent in the carbon ring or heterocyclic compound having organic substituents of the raw material (O 2 /organic substituent) is 0.75 or more and preferably in the range of 1 to 25.
  • the amount of the air is less than the above range, the yield of the nitrile compound decreases.
  • the amount of the air exceeds the above range, the space-time yield decreases.
  • the amount of the carbon ring or heterocyclic compound having organic substituents of the raw material based on the amount of the entire substances supplied to the reactor is in the range of 0.2 to 10% by volume and preferably in the range of 0.5 to 5% by volume, each amount being expressed as the volume of the gas.
  • the yield of the nitrile compound decreases.
  • the space-time yield decreases.
  • ammonia of the industrial grade can be used as ammonia used for ammoxidation.
  • the amount of ammonia expressed as the ratio of the amount by mole of ammonia to the amount by mole of the organic substituent in the carbon ring or heterocyclic compound is in the range of 1 to 10 and preferably in the range of 3 to 7.
  • the amount of ammonia is less than the above range, the yield of the nitrile compound decreases.
  • the amount of ammonia exceeds the above range, the space-time yield decreases.
  • the pressure of ammoxidation may be any of the atmospheric pressure, an added pressure and a reduced pressure. It is preferable that the pressure is in the range of around the atmospheric pressure to 0.2 MPa.
  • the time of contact between the reaction gas and the catalyst is varied depending on the conditions such as the type of the carbon ring or heterocyclic compound having organic substituents of the raw material, amounts by mole of ammonia and the gas containing oxygen supplied for the reaction relative to the amount of the raw material and the temperature of the reaction.
  • the time of contact is, in general, in the range of 0.5 to 30 seconds.
  • the temperature of the reaction is in the range of 300 to 500° C. and preferably in the range of 330 to 470° C. When the temperature is lower than the above range, the conversion decreases. When the temperature exceeds the above range, formation of byproducts such as carbon dioxide and hydrogen cyanide increases and the yield of the nitrile compound decreases.
  • the temperature of the reaction is suitably decided so as to provide the optimum yield under the above conditions with consideration on the change in the activity of the catalyst.
  • the temperature of the reaction can be stabilized by using the cooling tube of the partial vaporization type and the cooling tube of the complete vaporization type in combination in accordance with (A) and stable continuous operation can be conducted in the apparatus of the industrial scale; the distribution of the temperature can be made uniform by arranging the cooling tubes disposed in the fluidized catalyst bed in a manner such that the conditions described in (B) and (C) are satisfied; and the stable continuous operation for a long time is enabled by using the cooling medium described in (D) in the cooling tube of the complete vaporization type.
  • a vanadium-chromium solution was obtained.
  • a solution obtained by dissolving 41.1 g of phosphomolybdic acid H 3 (PMo 12 O 40 ) ⁇ 20H 2 O into 100 ml of water was added.
  • a solution obtained by dissolving 4.0 g of potassium acetate CH 3 COOK into 100 ml of water was added and, then, 2,500 g of a 20% by weight aqueous silica sol (containing 0.02% by weight of Na 2 O) was added.
  • 78 g of boric acid H 3 BO 3 was added and sufficiently mixed. The resultant fluid was concentrated by heating until the amount of the fluid became about 3,800 g.
  • the obtained catalyst solution was dried by spraying while the temperature at the inlet was kept at 250° C. and the temperature at the outlet was kept at 130° C.
  • the catalyst obtained after the drying by spraying was dried in a drier at 130° C. for 12 hours and calcined at 400° C. for 0.5 hours and, then, at 550° C. for 8 hours under a stream of the air and a fluidized catalyst was prepared.
  • the catalyst contained the components in amounts such that the ratio by atom of the components V:Cr:B:Mo:P:Na:K was 1:1:0.5:0.086:0.007:0.009:0.020 and the concentration of the catalyst components in the fluidized catalyst was 50% by weight.
  • the reaction was conducted using the reactor of ammoxidation shown in FIG. 1.
  • the reactor for producing a nitrile compound was packed with the fluidized catalyst prepared above. After the air and meta-xylene (MX) were mixed with ammonia gas, the mixed gas was preheated at 180° C. and supplied to the reactor.
  • MX meta-xylene
  • the reactor for producing a nitrile compound had a column having a diameter of 2.5 m and the equivalent diameter obtained in accordance with equation (1) described above was 0.9 m.
  • the cooling tubes were arranged in a manner such that, when a circle having the equivalent diameter is moved within the sectional plane of the fluidized catalyst bed, the cooling tubes always had a dipped circumference which is contained in or contacts this circle at any position of the circle (refer to FIG. 4).
  • the ratio (S1)/(S2) of the sectional area of the cooling tubes existing within the circle having the equivalent diameter in the section of the fluidized catalyst bed (S2) to the sectional area of the entire cooling tubes in the fluidized catalyst bed (S1) was adjusted in a range of 0.1 to 0.16.
  • a coil of the partial vaporization type and a coil of the complete vaporization type were used. (the amount of heat removed by the cooling tube of the complete vaporization type)/(the amount of heat removed by the cooling tube of the partial vaporization type) is about 0.4.
  • As the cooling water water having an electric conductivity of 0.5 ⁇ S/cm and a concentration of ionic SiO 2 of 0.02 ppm was used.
  • the load was gradually increased while the temperature of the reaction was monitored until the prescribed conditions were achieved.
  • the temperature in the starting stage of the operation could be stabilized in about 3 hours after the supply of the raw material was started and in about 2 hours after the load of the raw material reached the prescribed value.
  • the time required for the increase in the load of the raw material was about 1 hour.
  • the temperature was measured by thermometers disposed in three directions on the same plane in the reactor (refer to FIG. 5).
  • the temperatures during the stable operation as expressed by the difference from the prescribed temperature of 420° C. were as follows: TI- ⁇ circle over (1) ⁇ : the prescribed temperature ⁇ 0° C.
  • the cooling capacity increased stepwise. Due to the stepwise increase, marked fluctuations in the temperature of the reaction field took place several times during the period before reaching the constant load.
  • the time required for the increase in the load was 2 hours after the supply of the raw material was started and was twice as long as that in Example 1.
  • the time required for stabilizing the temperature after the load reached the prescribed value was about 3 hours and was 1.5 times as long as that in Example 1.
  • the time required for stabilizing the temperature after the supply of the raw material was started was about 5 hours and was 1.7 times as long as that in Example 1.

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US10/326,056 2001-12-25 2002-12-23 Reactor for producing a nitrile compound and method for operating the reactor Abandoned US20040005254A1 (en)

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JP391957/2001 2001-12-25
JP2001391957A JP4054960B2 (ja) 2001-12-25 2001-12-25 ニトリル化合物の製造方法
JP2001391956A JP4054959B2 (ja) 2001-12-25 2001-12-25 ニトリル化合物の製造方法
JP391956/2001 2001-12-25

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EP1323464A3 (de) 2004-09-22
EP1323464A2 (de) 2003-07-02
CN1428332A (zh) 2003-07-09
EP1323464B1 (de) 2006-08-09
DE60213752T2 (de) 2006-12-07
CN1280263C (zh) 2006-10-18
DE60213752D1 (de) 2006-09-21
US7371882B2 (en) 2008-05-13

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