CN101084187B - Method for the reduction of chlorine-containing components in organic isocyanates - Google Patents
Method for the reduction of chlorine-containing components in organic isocyanates Download PDFInfo
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- CN101084187B CN101084187B CN200580043880XA CN200580043880A CN101084187B CN 101084187 B CN101084187 B CN 101084187B CN 200580043880X A CN200580043880X A CN 200580043880XA CN 200580043880 A CN200580043880 A CN 200580043880A CN 101084187 B CN101084187 B CN 101084187B
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- isocyanate
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- isocyanide acyl
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/08—Processes
- C08G18/089—Reaction retarding agents
-
- 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
- B01J39/00—Cation exchange; Use of material as cation exchangers; Treatment of material for improving the cation exchange properties
- B01J39/04—Processes using organic exchangers
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C263/00—Preparation of derivatives of isocyanic acid
- C07C263/18—Separation; Purification; Stabilisation; Use of additives
- C07C263/20—Separation; Purification
Abstract
The invention relates to a method for largely eliminating chlorine compounds from organic isocyanates or isocyanate mixtures by contacting said isocyanates or isocyanate mixtures with a water-containing inert gas flow or an organic material having a cation-exchanging effect. The inventive method allows the isocyanates to be gently freed from chorine-containing compounds and is particularly suitable for temperature-sensitive isocyanates.
Description
The present invention relates to a kind ofly contact the method that makes organic isocyanate class or isocyanate mixture largely remove chlorine compound by the organic materials that makes isocyanic ester or isocyanate mixture and a kind of moisture inert gas flow or have a cationic exchange effect.This method can make isocyanic ester leniently remove chlorine-containing compound and be particularly suitable for those temperature sensitive isocyanic ester.
Organic isocyanate, for example, such as 2,4-and 2, the 6-tolylene diisocyanate also has aliphatic isocyanates, for example, and such as n-butyl isocyanate, because the result of their preparations often contains impurity, such as, particularly contain those compounds of hydrolyzable chlorine.When using these organic isocyanates, these impurity often cause reactive big ups and downs, and this is deleterious for a kind of reproducibility industrial application, and causes the decline of storage stability.Therefore, essence ground described impurity of removal from organic isocyanate not only has appreciable technical significance but also has Economic Importance.
For example, by US3,912,600 is known, by the heating isocyanic ester, thereby particularly removes the level that these volatile compounds reduce hydrolyzable chlorine with rare gas element stripping and extraction simultaneously.
In addition, for example known by EP 482490, come the purifying organic isocyanate by special distillation and crystallization technique.
The shortcoming of described these methods is that they only can be applied to the insensitive isocyanic ester of heat, and equally the insensitive impurity of heat are stood these operations insusceptibly.
Also described the processing that utilizes adjuvant except the pure thermal treatment of isocyanate compound, they can improve the removal to destructive chlorine compound.For example, patent US-A 3 373 182, US-A 3 759 971 and US-A4 094 894, US-A 3 458 558 and US-A 3 264 336 have described based on basic metal or non-alkali-metal adjuvant, such as metal oxide-type, metal cyanamide class, metal hydride class, in the presence of sterically hindered phenol metal fatty acid esters class, metal ring alkanoic acid salt, metal metasilicate salt, alkaline carbonate class, organometallic compound or contain the synthetic zeolite of (alkali) metal.Yet generally speaking, these adjuvants are difficult to separate with the isocyanic ester of purifying, and cause undesirable metal/metal ion of these organic isocyanates to pollute, and this can further produce detrimental action in the processing.In addition, in fact all these metals and metal complex have the effect of formation dipolymer, trimer and the carbodiimide do not expected.
Same reason also be applicable to epoxy compounds (referring to, for example EP 374 932 A and US6,245,935), formic acid or acetate or their derivative (referring to, US3 for example, 799,963) or trimethyl silyl compound (referring to, EP 524 507 A for example) as adjuvant.
In addition, DE-A 12 40 849 has disclosed a kind of method, wherein directly joins isocyanic ester by the water with an appropriate amount and by stirring the organic isocyanate purifying under the temperature that raises (according to example at 150 to 250 ℃) subsequently.Because security reason, this process only is suitable for a spot of isocyanic ester.For bigger amount, have the danger of local superheating at the water entry place, under the serious situation because the result that carbonic acid gas discharges can cause the blast of isocyanic ester container.In addition, because this high temperature, this method only is suitable for the insensitive isocyanic ester of heat.
Therefore, because the above-mentioned shortcoming of method known in the state of the art, an existing purpose provides a kind of permission with the largely removed method that extensively is suitable for of the hydrolyzable chlorine part in the organic isocyanate.
Had been found that a kind of method that in the mixture of organic isocyanate class or organic isocyanate class, reduces the hydrolyzable chlorine level now, it is characterized in that, the solution of the solution of the organic isocyanate class of liquid or the organic isocyanate class mixture of liquid or organic isocyanate class or the mixture of organic isocyanate class contacts with a kind of moisture inert gas flow or with the organic materials with a kind of cationic exchange effect in a first step, and in one second step this reaction mixture that is produced is removed the solid of any existence.
All definition and the parameter that above provides He provide below is provided scope of the present invention, and among any desired combination, no matter they are general definition and parameter or those definition and the parameter that limit in preferable range.
As employed term " hydrolyzable chlorine " hereinafter is to be used to refer to water to react the compound that forms hydrogenchloride or chloride ion.By example, but be not exclusively, these hydrolyzable chlorines are for example to prepare the sort of chloroformic acid amides that produces as intermediate in the process of isocyanic ester at the phosgenation by amine.
For method of the present invention, might adopt any desired organic isocyanate class or the mixture of isocyanates, term " isocyanic ester " is meant and comprises the compound that contains, two even more a plurality of isocyanate groups.
Preferred organic isocyanate class is, for example, have with aliphatic, cycloaliphatic, fragrant fat subsitutes family or the isocyanate groups that aromatic mode was connected monoisocyanates class, such as propyl isocyanate, butyl isocyanate, isocyanic acid stearyl ester, NSC 87419, benzyl mustard oil, isocyanic acid 2-phenyl chlorocarbonate, phenylcarbimide;
Have the molecular weight of 140g/mol to 400g/mol and have with aliphatic, cycloaliphatic, virtue fat subsitutes family and/or the isocyanate groups that connects of aromatic mode diisocyanates, such as 1,4-butane vulcabond, 1,6-hexane diisocyanate (HDI), the 2-methyl isophthalic acid, 5-pentane vulcabond, 1,5-two isocyanic acids-2,2-dimethyl pentyl ester (1,5-diisocyanato-2,2-dimethylpentane), 2,2,4-and/or 2,4,4-trimethylammonium-1, the 6-hexane diisocyanate, 1,10-decane vulcabond, 1,3-and 1, the 4-cyclohexyl diisocyanate, 1,3-and 1, two (the two isocyanide acyl methyl) hexanaphthenes of 4-, 1-isocyanide acyl-3,3,5-trimethylammonium-5-methylcyclohexane isocyanic ester (isophorone diisocyanate, IPDI), 4,4 '-dicyclohexyl methane diisocyanate, 1-isocyanide acyl-1-methyl-4-(3)-methylcyclohexane isocyanic ester (IMCI), two (isocyanide acyl methyl) norcamphane, 2-methylpentane 2, the 4-vulcabond, 1,3-and 1, two (the 2-isocyanide acyl third-2-yl) benzene (TMXDI) of 4-, 2,4-and 2,6-two isocyanide acyl toluene (TDI), 2,4 '-and 4,4 '-diphenylmethanediisocyanate, 1, the 5-naphthalene diisocyanate, the dipropylene glycol vulcabond, 2,4-or 2,6-two isocyanic acids-1-methylcyclohexane ester;
Triisocyanate class and/or higher polyfunctional isocyanate's class, such as 4-methyloctane isocyanide acyl group 1,8-vulcabond (nonane triisocyanate), 1,6,11-undecane triisocyanate, 3-isocyanide acyl methyl hexyl 1,6-vulcabond
And the mixture that also has any hope of above-mentioned organic isocyanate class.
Given special preferred version be those to have molecular weight be 85 to 400g/mol, very particularly preferably those to have molecular weight be 85 to 279g/mol above-mentioned organic isocyanate.
Also further preferably n-Isopropyl isocyanate and n-butyl isocyanate.
If the solution of the mixture of the mixture of the organic isocyanate class of the organic isocyanate class of liquid or liquid or the solution of organic isocyanate class or organic isocyanate class contacts with the organic materials with a kind of cationic exchange effect, then be suitable for following situation in the step 1 of method of the present invention:
The mixture of the organic isocyanate class of preferred use liquid or the organic isocyanate class of liquid especially preferably uses the liquid organic isocyanate class.The state of aggregation of the liquid here is meant the state under selected temperature of reaction.
For example, the organic materials with a kind of cationic exchange effect can be any polymeric, organic materials, and it contains the number acid group on a kind of basis of standard of comparison of water.
Employed organic materials should be to have exempted water and other isocyanate-reactive solvent and miscellany to a great extent in addition, and should be to separate by common separation method such as filtration, sedimentation or centrifugal and isocyanates, and should be to have exempted heavy metal ion to a great extent.
The preferred use has a kind of colloidal type of cationic exchange effect or the organic materials of macropore.Such material is for example known by DE-A1113570.
Can mention following suitable material: Lewatite by representation mode
SC 102, SC 104, SC 108, SPC 118 (all from Bayer AG) or cationic exchange Amberlite
Or Duolite
(all from Rohm and Haas).
The preferred material that is used for the purpose of method of the present invention is above-mentioned organic cation exchange material, and its matrix obtains by polymerization (multipolymer of vinylbenzene and Vinylstyrene and also have (methyl) acrylate and the multipolymer of Vinylstyrene).
Given in the method for the invention special preferred version is organic, cation exchange material, and their matrix obtains by polymerization (multipolymer of vinylbenzene and Vinylstyrene) and they contain some acidic-groups, for example sulfonic acid group.
For the purpose of method of the present invention, exempted water basically and be meant mark by Ka Er-Karl Fischer titration for by weight＜5%, preferred＜3% and preferred＜1% especially.May be that necessary this drying can be carried out with traditional method, with not replacing water, perhaps, preferably under reduced pressure carry out by these materials are carried out drying with the inert solvent of isocyanate reaction by for example.
For the purpose of method of the present invention, exempted isocyanate-reactive solvent and mixture basically and be meant that the level of this compounds is lower than 5% by weight, preferably be lower than 3% and especially preferably be lower than 1%.
Basically exempted heavy metal ion and be meant, under the background of method of the present invention, the horizontal content of these ionic is by weight less than 0.5%, preferably less than 0.3%, and especially preferably less than 0.1%.
The material that is used for a kind of cationic exchange effect of having of method of the present invention can or use or with at a kind of inert, use with the form of suspension in the nonreactive solvent of isocyanic ester with solvent-free solid form.
The material that is used for a kind of cationic exchange effect of having of method of the present invention can be regenerated and reuses in the method for the invention by the appropriate method step.
Based on the weight of isocyanic ester to be purified, the preferred usage quantity of material with a kind of cationic exchange effect is that particularly preferred amount is 0.5% to 50%, and particularly preferred amount is 1.0% to 10% greater than 0.1%.
Temperature of reaction for example is-10 to 200 ℃, preferred 20 ℃ to 140 ℃, and preferred especially 40 to 100 ℃, and further preferred 50 to 80 ℃.
The solution of the mixture of the mixture of the organic isocyanate class of liquid or the organic isocyanate class of liquid or the solution of organic isocyanate class or organic isocyanate class for example occurs in contacting of the organic materials with a kind of cationic exchange effect, according to batch size, in the time length of 5 minutes to 48 hours.
According to the present invention, these isocyanate compounds with the mode that contacting of described cation exchange material can be taken place are: this cationic exchange organic materials is used as stationary phase in a chromatographic column and the corresponding isocyanate compound flows through under the condition that limits.
By being incorporated into filter unit in this column technology, this method also can be at this type of or is similarly operated with continuous mode in the device.
If in the step 1 of method of the present invention, the solution of the mixture of the mixture of the organic isocyanate class of liquid or the organic isocyanate class of liquid or the solution of organic isocyanate class or organic isocyanate class contacts with a kind of moisture inert gas flow, then is suitable for following situation:
Can be used as gas that the rare gas element that is used for method of the present invention uses and be under typical reaction conditions not all gas with water, hydrogenchloride, amine or isocyanates reaction, for example, nitrogen, rare gas are such as argon gas, for example, the mixture of carbonic acid gas or these gases.
If necessary, operable solvent be under typical reaction conditions not with all organic solvents of water, hydrogenchloride, amine or isocyanates reaction.
The mixture of the organic isocyanate class of preferred use liquid or the organic isocyanate class of liquid especially preferably uses the liquid organic isocyanate class.Here the liquid state of aggregation is meant the state under selected temperature of reaction.
This temperature of reaction for example is-10 to 200 ℃, preferred 0 ℃ to 120 ℃, and preferred especially 10 to 80 ℃.
The solution of the mixture of the mixture of the organic isocyanate class of liquid or the organic isocyanate class of liquid or the solution of organic isocyanate class or organic isocyanate class and a kind of moisture inert gas flow contact can be for example by should moisture inert gas flow being passed among these isocyanic ester or by carrying out on these isocyanic ester.
Moisture this inert gas flow that is meant has certain steam partial pressure and/or uses a kind of mist vapour; Preferred this moisture inert gas flow has certain steam partial pressure.
The amount of the water that contacts with these isocyanic ester by this inert gas flow is/can regulate with traditional method, advantageously regulate by the water saturation curve of this rare gas element under differing temps, and for example for the every mole of hydrolyzable chlorine that is contained in this isocyanic ester, this amount is 0.5 to 2mol, and preferred 0.8 to 1.4mol and preferred especially 0.9 to 1.2mol.
The solution of the mixture of the mixture of the organic isocyanate class of this liquid or the organic isocyanate class of liquid or the solution of organic isocyanate class or organic isocyanate class for example occurs in contacting of a kind of moisture rare gas element, as a function of batch size, in the time length of 5 minutes to 48 hours.
For two kinds of method modification of step 1, below all be suitable for:
Before step 1, among or afterwards, also might carry out other purifying process, for example so that remove those staining components and by product.Such technology comprises for example uses reductive agent or oxygenant to handle and/or lose lustre, and also useful sorbent material such as gac and/or Fuller's earth and/or silica are handled.The effect of losing lustre like this can be to reducing further positive effect of part performance of the hydrolyzable chlorine in the isocyanate compound.In addition, the isocyanic ester that has existed after having reduced cl content by method of the present invention can be accepted a further purification process by distillation in a preferred embodiment.In this case, this distillation preferably for example is being under the pressure of 0.001mbar to 500mbar, is for example carrying out with a kind of still distillation or by the distillatory form of a thin-film evaporator.
Preferably contact is proceeded to purified isocyanic ester or isocyanate mixture and have a hydrolyzable chlorine content for less than 180ppm.
For the step 2 of method of the present invention, following situation all is suitable for for two modification of first step:
In second step of method of the present invention, this reaction mixture that is produced by step 1 has been removed existing solid, in appropriate circumstances, has particularly removed the organic materials with a kind of cationic exchange effect.
Remove solid can be traditionally by for example sedimentation, centrifugal or filter and carry out, preferably filter particularly pressure filtration.
Advantageously with two steps of method of the present invention in the combination of a reactor/filtering unit, suitably carry out with continuous mode under the situation.
Obtainable this sublimed isocyanic ester or isocyanate mixture have a hydrolyzable chlorine content usually for less than 400ppm and a very high purity according to the present invention.Therefore, they can be used for preparation example as pure especially oligomeric polymeric polyisocyanate or prepolymer or as the intermediate that is used for polyurethane molding and coating material.
The advantage of method of the present invention is, be easy to technically under that control and condition gentleness, and do not have substantially under the situation of formation of by product, can very optionally remove the organic isocyanate that carries out purifying or the harmful chlorine compound in the isocyanate mixture.This method also is suitable for the harsh progress of work of aliphatic isocyanates class.
Example
Following working example has been showed the present invention.They should not be construed as a kind of restriction.The value of the hydrolyzable chlorine of being reported (HC value) is based on weight.These products that obtained are analyzed (area % method, instrument: HP-5890 Series II, post: SE-30) by vapor-phase chromatography.
Example 1
N-butyl isocyanate (HC value: 2056ppm, GC purity assay: 98.7%) add a three-necked flask with 426.8g.Make a nitrogen gas stream pass initial isocyanic ester charging with 10 l per hour by a kind of agglomerating frit (hole 3), be heated to after 60 ℃ the latter, this nitrogen gas stream is passed a wash bottle that water is housed in advance under 23 ℃, be used to carry out wetting.After experiment beginning 30 minutes, a kind of solid begins precipitation.After 3.5 hours, take out a sample from supernatant liquor and be used to measure HC value (analysis has shown the HC value of 511ppm).After amounting to 11 hours, close the introducing of nitrogen, this batch materials is cooled to room temperature (RT) and filters.This provides a kind of clear liquid, has the HC value of 146ppm, and the GC purity assay is 99.2%, and productive rate is 94% of a theoretical value.
Example 2
With the n-butyl isocyanate of 3804g (HC value: 1300ppm, the purity of analyzing with GC: the three-necked flask of packing into 99.5%).Make a nitrogen gas stream pass initial isocyanic ester charging with 9-10 l per hour by a kind of agglomerating frit (hole 2), be heated to after 60 ℃ the latter, this nitrogen gas stream is passed a wash bottle that water is housed in advance under 23 ℃, be used to carry out wetting.After amounting to 15.5 hours, close the introducing (water consumption in the wash bottle: 3.5g), this batch materials is cooled to room temperature (RT) and filters of nitrogen.This provides a kind of clear liquid, has the HC value of 100ppm, and the GC purity assay is 99.5%, and productive rate is 96% of a theoretical value.
Example 3 (the present invention), example 4 to 6 (being used for comparison)
The n-butyl isocyanate of 80g is packed in the gastight bottle.Then with the Lewatit of 5.1g
SC 102 (Zeo-karb) is encased in this container.Heat this mixture down at 60 ℃.After 5 hours, take out the HC pH-value determination pH (HC value) that a sample is used for the hydrolyzable chlorine part from supernatant liquor.After amounting to 15 hours, remove Lewatit with filtering
, and with vapor-phase chromatography this clear liquid is analyzed subsequently.Outcome record is in table 1.
| Analyze | Example 3 | Example 4 (being used for comparison) | Example 5 (being used for comparison) | Example 6 (being used for comparison) |
| HC value (feed material) | 2478ppm | 2478ppm | 2478ppm | 2478ppm |
| Purity (GC of reactant) | 98.7％ | 98.7％ | 98.7％ | 98.7％ |
| Adjuvant | Lewatit
 |
Filamentary silver | Copper cash | Do not have |
| Add-on | 5.1g | 5.0g | 5.2g | 0 |
| The HC value of product (after 5 hours) | 291ppm | 2243ppm | 1820ppm | 2492ppm |
| The HC value of product (after 15 hours) | 135ppm | 1818ppm | 1195ppm | 2422ppm |
| The color of solution (after 5 hours) | Colourless | Colourless | Green and brown look | Colourless |
| Purity (GC of product) | 99.0％ | n.d. | n.d. | n.d. |
Filamentary silver is commercially available (Aldrich: catalog number (Cat.No.) 295744)
Copper cash is taken from a kind of earthing cable.
Example 7
With the n-butyl isocyanate of 50g (HC value: 2471ppm, the content of analyzing with GC: 98.7%) pack in the gastight bottle.Then with the Lewatit of 3.0g
SC 108 (Zeo-karb) packs in this container.This mixture heated 5 hours down at 60 ℃.Remove Lewatit subsequently after filtration
, and this clear liquid carried out HC value and isocyanate content analysis.Find that the HC value is 99.0% for 316ppm with the purity that GC analyzes.
Example 8 (being used for comparison)
With the n-butyl isocyanate of 50g (HC value: 2471ppm, the content of analyzing with GC: 98.7%) pack in the gastight bottle.Then with the Lewatit of 3.0g
MP 62 (anionite-exchange resin) packs in this container.This mixture heated 5 hours down at 60 ℃.Remove Lewatit subsequently after filtration
, and this clear liquid carried out HC value and isocyanate content analysis.Find that the HC value is 92.4% for 48ppm with the purity that GC analyzes.Here the purity of noticing isocyanic ester has a significant variation.
Example 9
But in a heating glass post, with the Lewatit of 39g
SC 102 (Zeo-karb) is fixed on (Lewatit between the Raschig ring of being made by glass
The height of layer: 105mm).The isocyanic ester of 1l was per hour suctioned through this post from a three-necked flask pump, and this post is 60 ℃ of heating down.The isocyanic ester that overflows from this post is flow back into this three-necked flask.With the interval of rule, take out sample and carry out the analysis of HC value from this three-necked flask.The time and the corresponding results of each analysis are reported in the table 2.After amounting to 29 hours, carry out purity check with the experiment end and to the isocyanic ester that obtains.Content by the GC assay determination is 99.5%.
Table 2
| Sample | The HC value |
| Initial value | 1127ppm |
| 13 hours | 220ppm |
| 22 hours | 135ppm |
| 29 hours | 100ppm |
Claims (14)
1. method that in the mixture of organic isocyanate class or organic isocyanate class, reduces the hydrolyzable chlorine level, it is characterized in that, the mixture of the organic isocyanate class of the organic isocyanate class of liquid or liquid is contacted with a kind of moisture inert gas flow in a first step, and this reaction mixture that produces is removed the solid of any existence in one second step.
2. the method for claim 1 is characterized in that, employed organic isocyanate class is following monoisocyanates class:
Propyl isocyanate, butyl isocyanate, isocyanic acid stearyl ester, NSC 87419, benzyl mustard oil, isocyanic acid 2-phenyl chlorocarbonate, phenylcarbimide,
Or following diisocyanates:
1,4-butane vulcabond, 1, the 6-hexane diisocyanate, the 2-methyl isophthalic acid, 5-pentane vulcabond, 1,5-two isocyanic acids-2,2-dimethyl pentyl ester, 2,2,4-trimethylammonium-1, the 6-hexane diisocyanate, 2,4,4-trimethylammonium-1, the 6-hexane diisocyanate, 1,10-decane vulcabond, 1, the 3-cyclohexyl diisocyanate, 1, the 4-cyclohexyl diisocyanate, 1, two (the two isocyanide acyl methyl) hexanaphthenes of 3-, 1, two (the two isocyanide acyl methyl) hexanaphthenes of 4-, isophorone diisocyanate, 4,4 '-dicyclohexyl methane diisocyanate, 1-isocyanide acyl-1-methyl-4-(3)-methylcyclohexane isocyanic ester, two (isocyanide acyl methyl) norcamphane, 2-methylpentane 2, the 4-vulcabond, 1, two (the 2-isocyanide acyl third-2-yl) benzene of 3-, 1, two (the 2-isocyanide acyl third-2-yl) benzene of 4-, 2,4-two isocyanide acyl toluene, 2,6-two isocyanide acyl toluene, 2,4 '-diphenylmethanediisocyanate, 4,4 '-diphenylmethanediisocyanate, 1, the 5-naphthalene diisocyanate, the dipropylene glycol vulcabond, 2,4-two isocyanic acids-1-methylcyclohexane ester, 2,6-two isocyanic acids-1-methylcyclohexane ester
Or following triisocyanate class:
4-methyloctane isocyanide acyl group 1,8-vulcabond (nonane triisocyanate), 1,6,11-undecane triisocyanate, 3-isocyanide acyl methyl hexyl 1,6-vulcabond, and any desirable mixture of above-mentioned organic isocyanate class.
3. the method for claim 1 is characterized in that, the organic isocyanate class is n-Isopropyl isocyanate or n-butyl isocyanate.
4. the method for claim 2 is characterized in that, the organic isocyanate class is n-Isopropyl isocyanate or n-butyl isocyanate.
5. each method in the claim 1 to 4 is characterized in that, the temperature of reaction of this first step is-10 to 200 ℃.
6. each method in the claim 1 to 4 is characterized in that, before step 1, among or afterwards, also carried out other purification process.
7. each method in the claim 1 to 4 is characterized in that, two steps are all carried out in the combination of a reactor/filtering unit.
8. each method in the claim 1 to 4 is characterized in that, it is performed until purified isocyanates or isocyanate mixture and has a hydrolyzable chlorine content less than 180ppm.
9. the method for claim 5 is characterized in that, before step 1, among or afterwards, also carried out other purification process.
10. the method for claim 5 is characterized in that, two steps are all carried out in the combination of a reactor/filtering unit.
11. the method for claim 6 is characterized in that, two steps are all carried out in the combination of a reactor/filtering unit.
12. the method for claim 5 is characterized in that, it is performed until purified isocyanates or isocyanate mixture and has a hydrolyzable chlorine content less than 180ppm.
13. the method for claim 6 is characterized in that, it is performed until purified isocyanates or isocyanate mixture and has a hydrolyzable chlorine content less than 180ppm.
14. the method for claim 7 is characterized in that, it is performed until purified isocyanates or isocyanate mixture and has a hydrolyzable chlorine content less than 180ppm.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE200410063222 DE102004063222A1 (en) | 2004-12-22 | 2004-12-22 | Method for reducing hydrolysable chlorine content in organic isocyanates, comprises contacting the isocyanate with water-containing inert gas stream/organic material with cationic exchange effect and releasing the obtained mixture |
| DE200410063221 DE102004063221A1 (en) | 2004-12-22 | 2004-12-22 | Method for reducing hydrolysable chlorine content in organic isocyanates, comprises contacting the isocyanate with water-containing inert gas stream/organic material with cationic exchange effect and releasing the obtained mixture |
| DE102004063222.7 | 2004-12-22 | ||
| DE102004063221.9 | 2004-12-22 | ||
| PCT/EP2005/013277 WO2006072360A1 (en) | 2004-12-22 | 2005-12-10 | Method for the reduction of chlorine-containing components in organic isocyanates |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011102384159A Division CN102351738A (en) | 2004-12-22 | 2005-12-10 | Method for the reduction of chlorine-containing components in organic isocyanates |
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| CN101084187A CN101084187A (en) | 2007-12-05 |
| CN101084187B true CN101084187B (en) | 2011-09-28 |
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| CN200580043880XA Expired - Fee Related CN101084187B (en) | 2004-12-22 | 2005-12-10 | Method for the reduction of chlorine-containing components in organic isocyanates |
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| DE (1) | DE102004063221A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104447411B (en) * | 2014-11-27 | 2016-10-05 | 湖南国发精细化工科技有限公司 | The process for purification of n-butyl isocyanate |
| CN107021920B (en) | 2016-08-12 | 2019-07-23 | 万华化学集团股份有限公司 | A kind of isocyanate polymeric catalyst and preparation method thereof, and its method for being used to prepare polyisocyanate |
| CN110396057B (en) * | 2019-07-16 | 2022-02-18 | 万华化学集团股份有限公司 | Method for preparing isocyanate with low chlorine content |
| CN114085166B (en) * | 2020-08-25 | 2023-05-05 | 万华化学集团股份有限公司 | Method for preparing high-purity high-stability isocyanate in high yield |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3219680A (en) * | 1961-08-28 | 1965-11-23 | Dow Chemical Co | Thiolfluoroformates and method for their preparation |
| DE1240849B (en) * | 1962-10-31 | 1967-05-24 | Olin Mathieson | Process for reducing the concentration of hydrolyzable chloride in an organic isocyanate |
| US3857871A (en) * | 1972-01-03 | 1974-12-31 | Upjohn Co | Process for reducing the acidity and hydrolyzable chloride content of polyisocyanates |
| CN1064074A (en) * | 1991-01-28 | 1992-09-02 | 陶氏化学公司 | Reduce the method for hydrolyzable chloride in the tolylene diisocyanate |
-
2004
- 2004-12-22 DE DE200410063221 patent/DE102004063221A1/en not_active Withdrawn
-
2005
- 2005-12-10 CN CN200580043880XA patent/CN101084187B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3219680A (en) * | 1961-08-28 | 1965-11-23 | Dow Chemical Co | Thiolfluoroformates and method for their preparation |
| DE1240849B (en) * | 1962-10-31 | 1967-05-24 | Olin Mathieson | Process for reducing the concentration of hydrolyzable chloride in an organic isocyanate |
| US3857871A (en) * | 1972-01-03 | 1974-12-31 | Upjohn Co | Process for reducing the acidity and hydrolyzable chloride content of polyisocyanates |
| CN1064074A (en) * | 1991-01-28 | 1992-09-02 | 陶氏化学公司 | Reduce the method for hydrolyzable chloride in the tolylene diisocyanate |
Non-Patent Citations (1)
| Title |
|---|
| DE 1240849 A,全文. |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101084187A (en) | 2007-12-05 |
| DE102004063221A1 (en) | 2006-07-13 |
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