CN101104595B - Process for preparing isocyanate - Google Patents
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- CN101104595B CN101104595B CN2007100980404A CN200710098040A CN101104595B CN 101104595 B CN101104595 B CN 101104595B CN 2007100980404 A CN2007100980404 A CN 2007100980404A CN 200710098040 A CN200710098040 A CN 200710098040A CN 101104595 B CN101104595 B CN 101104595B
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Abstract
The present invention provides a preparation method for isocyanate. The method takes a rotating packed bed reactor as the phosgenation reactor; polyamines and solvent are mixed, then the mixture and phosgene will be respectively sent to the rotating packed bed reactor for mixing and reaction under the super-gravity condition; then the reaction mixture left form the rotating packed bed reactor will be introduced to a plurality of series-wound kettles for further reaction until the solution is clean; when excessive phosgene and solvent are removed from the reaction products to get the corresponding isocyanate product. The method makes full use of the characteristics of the infinite strengthening transferring process and micro-mixing process of the rotating packed bed reactor to reduce the use amount of phosgene and solvent and reduce the energy consumption in the production process.
Description
Technical field
The present invention relates to a kind of method for preparing isocyanic ester, relate in particular to a kind of method that adopts rotating packed bed reactor to come the continuous production isocyanic ester.
Background technology
MDI is one of main raw material of urethane industry.With reactions such as MDI and polyethers or polyester polyols, under effects such as catalyzer, whipping agent, make various polyurethane high molecule materials, it can be widely used in rigid poly urethanes, semi-rigid foamed plastics, reaction and water plastic injection, intensified response cast molded polyurethane goods, and fields such as heat preserving and insulating material, synthon (spandex), binding agent and elastomerics.
Utilizing the polymethylene polyphenyl polyamine phosgenation reaction to carry out industrial production to obtain monomer M DI and polymeric MDI, is well-known method in the urethane industry.
The preparation method of isocyanic ester and chemism can be represented with following reaction formula (1)-(4):
RNH
2+COCl
2→RNHCOCl+HCl (1)
RNH
2+HCl→RNH
2·HCl (2)
RNH
2·HCl+COCl
2→RNHCOCl+2HCl (3)
RNHCOCl→RNCO+HCl (4)
RNCO+R-NH
2→R-NH-CO-NH-R (5)
RNCO+RNCO→R-N＝C＝N-R (6)
Wherein reaction (1) is commonly referred to photochmeical reaction, and in this reaction, amido and phosgene react rapidly, generate urea chloride and hydrogenchloride.Reaction (2) takes place rapidly simultaneously with reaction (1), the amido hydrochloride of generation under higher temperature (about 100-180 ℃) and phosgene further react, (3) react.(1) and (3) amido formyl chloride of generating further decompose the generation isocyanic ester, impel the generation of reaction (4).If the untimely or local phosgene concentration of polyamines blending dispersion deficiency, the hydrochloride of amine decomposes back and the product isocyanic ester reacts (5), even react (6) and generate by product, cause product quality to reduce, the product of reaction (5) and (6) is the thick material of solid simultaneously, along with the increase of its content, pipeline or reactor plugs can occur and influence the stability of production process.
The production technique of present known isocyanic ester mainly comprises following two classes:
The first kind is a stirring tank formula production technique, and in this technology, phosgene, corresponding amine and suitable solvent join in the reactor of belt stirrer, and under the violent stirring of stirring arm, the amine photoreactive gas mixes contact, and reaction generates isocyanic ester.In this technology owing to mix the restriction of intensity, phosgene and amine can not be rapidly, mix fully, and are easy to generate the dead band in stirring tank, make content of by-products increase, reduced the productive rate of isocyanic ester, and the operation of follow-up separation system has been caused very big difficulty.Therefore need phosgene excessive greatly in actual production, the ratio of general phosgene/amine is greater than 4, and the solvent that needs simultaneously is also excessive greatly, and the general concentration of amine in solvent is in 15%.So huge, the complex process of the required appliance arrangement of scale operation of this technology, operational stability is poor, the energy consumption height.
Second class mainly is the injection reactor production technique, such production technique has overcome the shortcoming of stirring tank formula reaction process, the amine photoreactive gas is realized quick moment mixing by injection reactor, carry out simultaneously phosgenation reaction in injection reactor, the injection reactor production technique of relevant patent report has:
CN1127248A discloses a kind of phosgenation reaction, this method prepares isocyanic ester by the gas phase phosgenation method, be reflected in the mixing reactor and carry out, wherein first homogenizing zone is equivalent to the long-pending 20-80% of overall reactor, second section is equivalent to the long-pending 80-20% of overall reactor, and logistics is near piston flow in second section.This patent thinks that actinic reactor does not have blockage problem, and phosgene is excessive few.In the method for this Patent publish, the processing more complicated of gas-phase injection reactor, service temperature is too high, has potential safety hazard.
CN88105193 discloses a kind of isocyanic ester preparation method, and this method adopts orifice jet formula injection reactor, has the aperture of certain number on the wall of injection reactor necking down, and one of them reactive component is spurted in another reactive component by aperture; This method needs higher phosgene overrate equally, and the ratio of phosgene and amine generally is greater than 1.5, even may reach 20.This method is similarly the gas phase phosgenation reaction under the high temperature, and temperature of reaction is higher, has certain potential safety hazard.
US4289732 discloses a kind of method of producing isocyanic ester, the reactor that this method discloses is in a cylindrical mixing section, two kinds of reactant (being respectively the amine photoreactive gas) collisions mutually that present the sector shape injection stream, thereby realization short mix, but this method not only requires inlet pressure very high, and do not produce the mobile dead band at mixing section, may cause the obstruction of reaction chamber.
US 3,226,410 disclose a kind of technology that is used to produce isocyanic ester, the equipment that this technology is used for the reaction of raw material polyamines photoreactive gas short mix is a kind of tubular reactor of hole jet type, because the reactor of announcing in the patent can not be realized the quick moment mixing of storeroom, need concentration of reactants is reduced greatly in order to obtain satisfied productive rate, need bigger energy consumption to reclaim solvent.
Because known method must be with the reactant of a large amount of solvent cuts, and the overrate height of phosgene, also need under the relatively-high temperature high pressure, react simultaneously, have defectives such as reaction yield is low, production cost height, the used injection reactor of prior art stops up easily because structure design is unreasonable in addition.Therefore, need to seek a kind of method that can overcome the production isocyanic ester of above-mentioned defective.
High-gravity technology is a new technology of utilizing the hypergravity environment more much bigger than earth gravity acceleration that mass transfer, heat transfer process and micro mixing are strengthened, produces mimic hypergravity environment by rotation on earth and obtains.It can increase substantially the transformation efficiency and the selectivity of reaction, dwindles the volume of reactor significantly, simplifies technology, flow process, and implementation procedure energy-efficient reduces disposal of pollutants.Research and analysis show, under the hypergravity environment, molecular diffusion between different sized molecules and interphase mass transfer process be faster than under the conventional gravity field all, produce the contact of flowing in solution-air, liquid-liquid, the porous medium of liquid-solid two-phase under the hypergravity environment bigger hundreds of times to thousand times than earth gravity field, great shear forces makes liquid crushing become nano level film, silk and drips, produce huge and phase interface fast updating, make and improve 1-3 the order of magnitude in the traditional tower of interphase mass transfer speed ratio, microcosmic mixes and mass transfer process is greatly strengthened.No. 95215430.7 Chinese patent application discloses the structure about hypergravity swinging bed device.Simultaneously, also obtaining important progress aspect the applied research of high-gravity technology, making high-gravity technology be extended to chemical reaction process from the physical process of separation, desorb.But do not see the report that high-gravity technology is applied to polyamines phosgenation reaction synthesizing isocyanate technology so far as yet.
Summary of the invention
The object of the present invention is to provide a kind of new method for preparing isocyanic ester.
Technical scheme provided by the present invention is as follows:
A kind of preparation has the method for the isocyanic ester of general formula (I),
R(NC0)
n (I)
Wherein, R represents aliphatics, alicyclic or aromatic hydrocarbyl, and has 2 carbon atom arrangement at least between 2 NCO groups, and n 〉=2, and described method comprises the steps:
With one or more amine after the dilution and pure phosgene liquid or phosgene solution injection rotating packed bed reactor with general formula (II), mix, react, generate the isocyanic ester that has general formula (I) accordingly,
R(NH
2)
n (II)，
Wherein, R and n are as defined above.
The rotating packed bed reactor that is adopted in the inventive method, including, but not limited to rotating packed bed formula, deflector type, helical channel formula, fixed-rotor-type or rotating compact disc formula rotating packed bed reactor, preferred rotating packed bed formula rotating packed bed reactor.Filler among the present invention in the ring packing layer of rotating packed bed reactor can be wire packing, Mellapak packing or corrugated sheet-net packing, preferred corrugated sheet-net packing.Can adopt rule or irregular mode to fill.
As reference of the present invention, the detailed introduction of the characteristics of relevant this type of rotating packed bed reactor can be with reference to following technical information and document, as: work such as Chen Jianfeng " high-gravity technology and application-a new generation reacts and isolation technique ", Chemical Industry Press; Rotating packed bed reactor described in Chinese patent ZL95107423.7, Chinese patent ZL92100093.6, the Chinese patent ZL95105343.4.
When implementing the inventive method, the rotating speed of rotating packed bed reactor rotor is 100-3000 rev/min, is preferably 400-2000 rev/min, more preferably 450-1500 rev/min.
When implementing the inventive method, the flow velocity that enters the amine in the hypergravity rotatable reactor is 0.5-20m/s, is preferably 2-10m/s, more preferably 3-5m/s; The flow velocity of phosgene liquid or phosgene solution is 0.5-20m/s, is preferably 2-10m/s, more preferably 3-5m/s; At least more than the 100rpm, preferred 400rpm at least strengthens the mixing between two strands of materials to obtain enough centrifuge fields to rotor speed.
In the method for the invention, short mix and reacting in rotating packed bed reactor such as polyamines photoreactive gas, the part by weight of phosgene and polyamines is generally 1.5-20, is preferably 2.5-10, more preferably 3-6.The concentration of the amine aqueous solution among the present invention after the dilution is 10-45wt%, is preferably 15-35wt%.
In the method for the invention, the solvent that is used to dilute amine is selected from but is not limited to benzene, toluene, chlorobenzene, orthodichlorobenzene, santochlor, a chlordiphenyl, dimethyl terephthalate ester or diethyl phthalate, and these solvents can use separately also can mix use.In the method for the invention, be used to dilute the preferred chlorobenzene of solvent of amine.
In the method for the invention, phosgene can pure phosgene liquid or the form charging of phosgene solution.The concentration of described phosgene solution is 25-100wt%, is preferably 50-80wt%.
Wherein the solvent of phosgene solution or thinner are selected from benzene, toluene, chlorobenzene, orthodichlorobenzene, santochlor, a chlordiphenyl, dimethyl terephthalate ester or diethyl phthalate, and these solvents can use separately also can mix use.The preferred chlorobenzene of the solvent of phosgene solution or thinner in the method for the invention.
In the method for the present invention, according to the type difference of employed rotating packed bed reactor, the feeding manner that corresponding employing is different.For example, when adopting rotating packed bed formula rotating packed bed reactor, amine photoreactive gas solution after the dilution is respectively from being positioned near two liquid feed pipes (the perhaps a plurality of liquid feed pipes the high-gravity rotating bed centre of rotor, when one material adopts a plurality of liquid feed pipe, this strand material is evenly distributed on each feed-pipe) enter high-gravity rotating bed in, and spray on the rotor of reactor by two liquid distributors (perhaps a plurality of liquid distributor) respectively.Reaction solution flows to the rotor outer rim by the rotor inner edge under action of centrifugal force, the mutual hybrid concurrency of reaction solution is given birth to reaction during this period, generates the isocyanic ester product of general formula (I).Described isocyanic ester product is thrown on the shell at rotor outer rim place, is pooled to the exit at last and flows out under action of gravity.
In the method for the invention, foundation is answered temperature, pressure and the reaction time of the reaction of being carried out in the corresponding adjustment rotating packed bed reactor as the difference of the kind of the amine of reaction raw materials.
The reaction mixture of discharging from rotating packed bed reactor can adopt the further phosgenation of ordinary method clear until solution becomes, separates then, aftertreatment such as purified reaction product, for example removes excessive phosgene and solvent after the packed column distillation reaction product.
In a preferred embodiment, when the amine of general formula (II) was aliphatics or cyclic aliphatic polyamines, R represented to have 15 carbon atoms at the most, the aliphatic alkyl or the cyclic aliphatic alkyl of preferred 4-13 carbon atom, and have two carbon atoms at least between two nitrogen-atoms; N is 2-10, preferred 2-6, more preferably 2-4.
The exemplary of suitable fatty amine has, for example the aliphatic triamine of describing among aliphatic diamine of describing among the EP0289840 and the EP-0749958.Be preferably isophorone diamine (IPDA), hexamethylene-diamine (HDA), two (4-cyclohexyl) methane (H12MDA).
In a preferred embodiment, when the amine of general formula (II) was aromatic polyamine, R represented to have the aromatic group of at least 6 carbon atoms, but the molecular weight that requires R is less than 1000, preferably less than 500; N is 2-100, preferred 2-40, especially preferred 2-20, more preferably 2-15.For example 4,4 '-diaminodiphenyl-methane, polymethylene polyphenyl polyamine etc.
Suitable aromatic amine comprises two amido benzene, two amido toluene, diaminonaphthalene, 2,4-tolylene diamine, or 2, and 4-tolylene diamine and 2, the 6-tolylene diamine is by the mixture of 80/20 or 65/35 weight isomer proportion.
Wherein preferred amine comprises 4,4 '-diaminodiphenyl-methane, polymethylene polyphenyl polyamine, and 4,4 '-diaminodiphenyl-methane and polymethylene polyphenyl polyamine be in the mixture of any ratio.
The isocyanic ester of preferred general formula (I) is MDI (methyl diphenylene diisocyanate) and many many methyl of phenyl polyisocyanates.
Rotating packed bed reactor is that polyamines phosgenation provided by the invention prepares most important conversion unit in the method for isocyanic ester.Conversion unit commonly used in the prior art has stirred-tank reactor, injection reactor, tubular reactor etc.But what the present invention adopted is rotating packed bed reactor, and it has the mixing of the microcosmic of reinforcement, stable operation, scale effect is little, equipment volume is little, is convenient to move, dismantles and advantage such as installation.Because the high speed rotating of rotating packed bed reactor internal rotor forms a kind of stable hypergravity environment, its hypergravity level can reach the natural gravity acceleration tens so that more than the hundred times.Reaction mass in packing layer, baffling passage or the helical channel of rotation high dispersive, high turbulence, mix and interface rapidly more under the news by force, contact in crooked duct with great speed of relative movement, greatly strengthen the micro mixing between mass transfer process and the material, made material can reach microcosmic admixture completely fast.In addition, adopt rotating packed bed reactor, the solid-state intermediate product that reaction process produces is difficult in the reactor under huge centrifugal action to be assembled, and has overcome the shortcoming that traditional injection reactor easily stops up conversion unit.
Compare with existing method, method provided by the invention can be given full play to the characteristics of very big strengthening transfer process of rotating packed bed reactor and micro mixing, be used to strengthen the mixed effect of amine photoreactive gas, enhance productivity, improve the quality of products, reduce the usage quantity of solvent and the overrate of phosgene simultaneously, reduce the energy consumption of process, and the secondary product that generates is few.
Description of drawings
Fig. 1 is the structural representation of the rotating packed bed reactor that adopts in the specific embodiments of the present invention.
Fig. 2 is the section distribution plan of liquid feed pipe in the rotating packed bed reactor among Fig. 1.
Embodiment
Further specify the method for preparing isocyanic ester provided by the present invention below in conjunction with drawings and Examples.But the invention is not restricted to listed embodiment, also should be included in other any known change in the interest field of the presently claimed invention.
As shown in Figure 1, the raw material amine with general formula (II) dilutes with suitable inert solvent.Amine aqueous solution after the dilution sprays on the supergravity reactor rotor inner edge after entering high-gravity rotating bed liquid distributor by the liquid inlet tube 1 that is positioned at high-gravity rotating bed rotor center place one side.Meanwhile, spray on the supergravity reactor rotor inner edge after the phosgene solution after liquid phosgene or the dilution enters into another liquid distributor by the liquid inlet tube 2 that is positioned at the center opposite side.Two strands of materials are flowed to outer rim by the inner edge of rotor under action of centrifugal force, and mix mutually during this time and react, and reaction solution is thrown on the shell at filler outer rim place, and the final reaction product is pooled to relief outlet 6 and flows out under action of gravity.The method of the invention adopts the continous way mode of production.
The rotating packed bed formula rotating packed bed reactor that is adopted among the following embodiment is manufactured and designed by the Ministry of Education of Beijing University of Chemical Technology hypergravity Engineering Research Center.
This embodiment is the experimental result of the method for the invention on 1800 tons/year isocyanic ester full scale plant.
With 4,4 '-after the mixture of diaminodiphenyl-methane and polymethylene polyphenyl polyamine (weight ratio is 6 to 4) is warmed up to 100-140 ℃, mix the back with the flow of about 200kg/h and chlorobenzene and introduce, spray through liquid distributor on the inner edge of high-gravity rotating bed rotor 4 by liquid feed pipe 1 with the flow of 800kg/h; Meanwhile, the phosgene chlorobenzene solution that with concentration is 75wt% is introduced by liquid feed pipe 2 with the flow of 900kg/h, spray through another liquid distributor on the inner edge of rotor 4 of rotating packed bed formula rotating packed bed reactor (filler 3 is the corrugated sheet-net packing of rule), two liquid feed pipes 1 and 2 are 25 degree radians, and to be distributed in transmission shaft 7 be on the circular arc at center, and two strands of materials are 3m/s through the flow velocity of feed-pipe 1 and feed-pipe 2; Motor 8 drives the rotor high-speed rotation, and rotating speed is adjusted into 800rpm; Temperature of reaction is 75-85 ℃; Reaction pressure is 2.5kg/cm
2(gauge pressure); Reaction time is 3 minutes.The gas that reaction produces is discharged by venting port 5; The liquid reaction mixture that produces is discharged from relief outlet 6.Then the reaction mixture of discharging is incorporated into three placed in-line temperature successively and reaches 85-95 ℃ respectively, 100-110 ℃ and 115-125 ℃, and volume is 0.5m
3Still in further phosgenation is clear until solution becomes, reaction product is behind packed column distillation, productive rate is 98.3wt%.
Embodiment 2
This embodiment is the experimental result of the method for the invention on 1800 tons/year isocyanic ester full scale plant.
With 4,4 '-after the mixture of diaminodiphenyl-methane and polymethylene polyphenyl polyamine (weight ratio is 6: 4) is warmed up to 100-140 ℃, mix the back with the flow of about 200kg/h and chlorobenzene and introduce, spray through liquid distributor on the inner edge of rotor 4 of rotating packed bed formula rotating packed bed reactor (filler 3 is the corrugated sheet-net packing of rule) by liquid feed pipe 1 with the flow of 700kg/h; Meanwhile, the phosgene chlorobenzene solution that with concentration is 75wt% is introduced by liquid feed pipe 2 with the flow of 800kg/h, spray through another liquid distributor on the inner edge of high-gravity rotating bed rotor 4, two liquid feed pipes 1 and 2 are 30 degree radians, and to be distributed in transmission shaft 7 be on the circular arc at center, two strands of materials are 2.5m/s through the flow velocity of feed-pipe 1 and feed-pipe 2, motor 8 drives the rotor high-speed rotation, and rotating speed is adjusted into 800rpm, and temperature of reaction is 80-95 ℃; Reaction pressure is 3kg/cm
2Reaction time is 2 minutes.The gas that reaction produces is discharged by venting port 5; The liquid reaction mixture that produces is discharged from relief outlet 6.Then the reaction mixture of discharging is incorporated into three placed in-line temperature successively and reaches 85-95 ℃ respectively, 100-110 ℃ and 115-125 ℃, and volume is 0.5m
3Still in further phosgenation is clear until solution becomes, reaction product is behind packed column distillation, productive rate is 98.1wt%.
This embodiment is the experimental result of the method for the invention on 100,000 tons/year isocyanic ester full scale plant.
With 4,4 '-after the mixture of diaminodiphenyl-methane and polymethylene polyphenyl polyamine (weight ratio is 6: 4) is warmed up to 100-140 ℃, with about 11, the flow of 000kg/h with 32, the chlorobenzene of the flow of 000kg/h mixes the back to be introduced by liquid feed pipe 1, feed-pipe 1 has 6, and be evenly distributed on the transmission shaft is on the circular arc at center, mixing solutions sprays through liquid distributor on the inner edge of rotor 4 of rotating packed bed formula rotating packed bed reactor (filler 3 is the corrugated sheet-net packing of rule), and the flow velocity of spray is 4m/s; Meanwhile, with concentration is that the phosgene chlorobenzene solution of 75wt% is with 48, the flow of 000kg/h is introduced by liquid feed pipe 2, feed-pipe 2 has 6 equally, and being evenly distributed on transmission shaft 7 is on the circular arc at center, feed-pipe 2 and feed-pipe 1 mutual equidistant staggered arrangement, the phosgene chlorobenzene solution sprays on the inner edge of high-gravity rotating bed rotor 4 through the liquid distributor on the feed-pipe 2, the flow velocity of liquid spraying is 4m/s, motor 8 drives the rotor high-speed rotation, rotating speed is adjusted into 1000rpm, and temperature of reaction is 75-85 ℃; Reaction pressure is 2.5kg/cm
2Reaction time is 4 minutes.The gas that reaction produces is discharged by venting port 5; The liquid reaction mixture that produces is discharged from relief outlet 6.Then the reaction mixture of discharging is introduced three placed in-line temperature successively and reach 85-95 ℃ respectively, 100-110 ℃ and 115-125 ℃, and volume is 30m
3Still in further phosgenation is clear until solution becomes, reaction product is behind packed column distillation, productive rate is 97.8wt%.
This embodiment is the experimental result of the method for the invention on 50,000 tons/year isocyanic ester full scale plant.
After tolylene diamine is warmed up to 80-140 ℃, with about 5, the flow of 000kg/h with 2, the chlorobenzene of the flow of 000kg/h mixes the back to be introduced by liquid feed pipe 1, feed-pipe 1 has 6, and being evenly distributed on the transmission shaft is on the circular arc at center, and mixing solutions sprays through liquid distributor on the inner edge of rotor 4 of rotating packed bed formula rotating packed bed reactor (filler 3 is the corrugated sheet-net packing of rule), and the flow velocity of spray is 2.5m/s; Meanwhile, with concentration is that the phosgene chlorobenzene solution of 75wt% is with 20, the flow of 000kg/h is introduced by liquid feed pipe 2, feed-pipe 2 has 6 equally, and being evenly distributed on transmission shaft 7 is on the circular arc at center, feed-pipe 2 and feed-pipe 1 mutual equidistant staggered arrangement, the phosgene chlorobenzene solution sprays on the inner edge of high-gravity rotating bed rotor 4 through the liquid distributor on the feed-pipe 2, the flow velocity of spray is 2.5m/s, motor 8 drives the rotor high-speed rotation, rotating speed is adjusted into 1000rpm, and temperature of reaction is 65-75 ℃; Reaction pressure is 3-4kg/cm
2Reaction time is 4 minutes.The gas that reaction produces is discharged by venting port 5; The liquid reaction mixture that produces is discharged from relief outlet 6.Then the reaction mixture of discharging is introduced three placed in-line temperature successively and reach 85-95 ℃ respectively, 100-110 ℃ and 115-125 ℃, and volume is 30m
3Still in further phosgenation is clear until solution becomes, reaction product is behind packed column distillation, productive rate is 97.3wt%.
Claims (10)
1. one kind prepares the have general formula method of isocyanic ester of (I),
R(NCO)
n (I)
Wherein, R represents aliphatics, alicyclic or aromatic hydrocarbyl, and has 2 carbon atom arrangement at least between 2 NCO groups, and n 〉=2, and described method comprises the steps:
With one or more amine after the dilution and pure phosgene liquid or phosgene solution injection rotating packed bed reactor with general formula (I I), mix, react, generate the isocyanic ester that has general formula (I) accordingly,
R(NH
2)
n (II)，
Wherein, R and n are as defined above.
2. method according to claim 1 is characterized in that, described rotating packed bed reactor is selected from rotating packed bed formula, deflector type, helical channel formula, fixed-rotor-type or rotating compact disc formula rotating packed bed reactor.
3. method according to claim 2, it is characterized in that, described rotating packed bed reactor is a rotating packed bed formula rotating packed bed reactor, and the filler in the ring packing layer of this reactor is a kind of in wire packing, Mellapak packing or the corrugated sheet-net packing, and fills with rule or irregular mode.
4. method according to claim 3 is characterized in that, the filler in the ring packing layer of described rotating packed bed reactor is a corrugated sheet-net packing; The rotating speed of described rotating packed bed reactor rotor is 100-3000 rev/min; The flow velocity that enters the amine in the rotating packed bed reactor is 0.5-20m/s; The flow velocity of phosgene liquid or phosgene solution is 0.5-20m/s; The concentration of described phosgene solution is 25-100wt%; The part by weight of phosgene and polyamines is 1.5-20; The concentration of the amine aqueous solution after the dilution is 10-45wt%.
5. method according to claim 4 is characterized in that, the rotating speed of described rotating packed bed reactor rotor is 400-2000 rev/min; The flow velocity that enters the amine in the rotating packed bed reactor is 2-10m/s; The flow velocity of phosgene liquid or phosgene solution is 2-10m/s; The concentration of described phosgene solution is 50-80wt%; The part by weight of phosgene and polyamines is 2.5-10; The concentration of the amine aqueous solution after the dilution is 15-35wt%.
6. method according to claim 5 is characterized in that, the rotating speed of described rotating packed bed reactor rotor is 450-1500 rev/min; The flow velocity that enters the amine in the rotating packed bed reactor is 3-5m/s; The flow velocity of phosgene liquid or phosgene solution is 3-5m/s; The part by weight of phosgene and polyamines is 3-6.
7. according to each described method among the claim 1-6, it is characterized in that the solvent that is used for diluting amine is selected from one or more of benzene, toluene, chlorobenzene, orthodichlorobenzene, santochlor, a chlordiphenyl, dimethyl terephthalate ester or diethyl phthalate; The solvent of phosgene solution or thinner are selected from one or more in benzene, toluene, chlorobenzene, orthodichlorobenzene, santochlor, a chlordiphenyl, dimethyl terephthalate ester or the diethyl phthalate.
8. method according to claim 7 is characterized in that, the solvent that is used to dilute amine is a chlorobenzene; The solvent of phosgene solution or thinner are chlorobenzene.
9. method according to claim 8 is characterized in that described amine is selected from isophorone diamine, hexamethylene-diamine, two (4-aminocyclohexyl) methane, 2, the 4-tolylene diamine, 2,4-tolylene diamine and 2, the 6-tolylene diamine is pressed the mixture of the weight isomer proportion of 80/20-65/35,4,4 '-diaminodiphenyl-methane, polymethylene polyphenyl polyamine, perhaps 4,4 '-diaminodiphenyl-methane and polymethylene polyphenyl polyamine be by the mixture of any weight ratio.
10. method according to claim 9 is characterized in that, described isocyanic ester is 4,4 '-diphenylmethanediisocyanate and/or many many methyl of phenyl polyisocyanates.
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| CN101811017B (en) * | 2010-04-23 | 2012-01-11 | 烟台万华聚氨酯股份有限公司 | Stirring and grinding reactor and method for preparing isocyanate with same |
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| EP2586770A1 (en) * | 2011-10-27 | 2013-05-01 | Basf Se | Method for producing isocyanates and/or polyisocyanates |
| US8686182B2 (en) | 2011-10-27 | 2014-04-01 | Basf Se | Process for preparing isocyanates and/or polyisocyanates |
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