CN1860102A - Process for purifying mesotrione - Google Patents
Process for purifying mesotrione Download PDFInfo
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- CN1860102A CN1860102A CN 200480028185 CN200480028185A CN1860102A CN 1860102 A CN1860102 A CN 1860102A CN 200480028185 CN200480028185 CN 200480028185 CN 200480028185 A CN200480028185 A CN 200480028185A CN 1860102 A CN1860102 A CN 1860102A
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- mesotrione
- nmsba
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- enolate
- crystallization
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- 239000005578 Mesotrione Substances 0.000 title claims abstract description 158
- KPUREKXXPHOJQT-UHFFFAOYSA-N mesotrione Chemical compound [O-][N+](=O)C1=CC(S(=O)(=O)C)=CC=C1C(=O)C1C(=O)CCCC1=O KPUREKXXPHOJQT-UHFFFAOYSA-N 0.000 title claims abstract description 156
- 238000000034 method Methods 0.000 title claims abstract description 86
- 238000000746 purification Methods 0.000 claims abstract description 45
- 239000012535 impurity Substances 0.000 claims abstract description 39
- 239000000243 solution Substances 0.000 claims description 87
- 238000002425 crystallisation Methods 0.000 claims description 73
- 230000008025 crystallization Effects 0.000 claims description 63
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 50
- 229910052799 carbon Inorganic materials 0.000 claims description 50
- 238000001914 filtration Methods 0.000 claims description 41
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 27
- SKDDBIWRHFHMKM-UHFFFAOYSA-N 4-methylsulfonyl-2-nitrobenzoyl chloride Chemical compound CS(=O)(=O)C1=CC=C(C(Cl)=O)C([N+]([O-])=O)=C1 SKDDBIWRHFHMKM-UHFFFAOYSA-N 0.000 claims description 23
- 238000002360 preparation method Methods 0.000 claims description 23
- 238000006243 chemical reaction Methods 0.000 claims description 22
- -1 NMSBC) form enol ester Chemical class 0.000 claims description 16
- 238000001179 sorption measurement Methods 0.000 claims description 15
- 238000005837 enolization reaction Methods 0.000 claims description 14
- OILAIQUEIWYQPH-UHFFFAOYSA-N cyclohexane-1,2-dione Chemical compound O=C1CCCCC1=O OILAIQUEIWYQPH-UHFFFAOYSA-N 0.000 claims description 13
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 claims description 12
- 239000003960 organic solvent Substances 0.000 claims description 12
- 229910052700 potassium Inorganic materials 0.000 claims description 12
- 239000011591 potassium Substances 0.000 claims description 12
- 230000008707 rearrangement Effects 0.000 claims description 12
- 239000002904 solvent Substances 0.000 claims description 12
- 239000007864 aqueous solution Substances 0.000 claims description 9
- 230000003647 oxidation Effects 0.000 claims description 8
- 238000007254 oxidation reaction Methods 0.000 claims description 8
- 230000010354 integration Effects 0.000 claims description 7
- 238000000638 solvent extraction Methods 0.000 claims description 4
- 239000003125 aqueous solvent Substances 0.000 abstract 1
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 111
- QNOUABMNRMROSL-UHFFFAOYSA-N 110964-79-9 Chemical compound CS(=O)(=O)C1=CC=C(C(O)=O)C([N+]([O-])=O)=C1 QNOUABMNRMROSL-UHFFFAOYSA-N 0.000 description 80
- JFDZBHWFFUWGJE-UHFFFAOYSA-N benzonitrile Chemical compound N#CC1=CC=CC=C1 JFDZBHWFFUWGJE-UHFFFAOYSA-N 0.000 description 65
- 238000011005 laboratory method Methods 0.000 description 47
- ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical compound CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 description 46
- 238000010561 standard procedure Methods 0.000 description 38
- WEVYAHXRMPXWCK-UHFFFAOYSA-N Acetonitrile Chemical compound CC#N WEVYAHXRMPXWCK-UHFFFAOYSA-N 0.000 description 33
- 239000000203 mixture Substances 0.000 description 30
- 238000004821 distillation Methods 0.000 description 26
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 24
- YGYAWVDWMABLBF-UHFFFAOYSA-N Phosgene Chemical compound ClC(Cl)=O YGYAWVDWMABLBF-UHFFFAOYSA-N 0.000 description 9
- 150000001263 acyl chlorides Chemical class 0.000 description 9
- 229910017053 inorganic salt Inorganic materials 0.000 description 9
- 238000000605 extraction Methods 0.000 description 8
- 239000002594 sorbent Substances 0.000 description 7
- OXBDLEXAVKAJFD-UHFFFAOYSA-N 1-methyl-4-methylsulfonyl-2-nitrobenzene Chemical compound CC1=CC=C(S(C)(=O)=O)C=C1[N+]([O-])=O OXBDLEXAVKAJFD-UHFFFAOYSA-N 0.000 description 6
- 239000002994 raw material Substances 0.000 description 6
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 4
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 3
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 3
- 239000012074 organic phase Substances 0.000 description 3
- 238000005406 washing Methods 0.000 description 3
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 description 2
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- NTIZESTWPVYFNL-UHFFFAOYSA-N Methyl isobutyl ketone Chemical compound CC(C)CC(C)=O NTIZESTWPVYFNL-UHFFFAOYSA-N 0.000 description 2
- JUJWROOIHBZHMG-UHFFFAOYSA-N Pyridine Chemical compound C1=CC=NC=C1 JUJWROOIHBZHMG-UHFFFAOYSA-N 0.000 description 2
- 239000008346 aqueous phase Substances 0.000 description 2
- 229920001429 chelating resin Polymers 0.000 description 2
- 239000012071 phase Substances 0.000 description 2
- 238000006462 rearrangement reaction Methods 0.000 description 2
- 230000000717 retained effect Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000003021 water soluble solvent Substances 0.000 description 2
- YIWUKEYIRIRTPP-UHFFFAOYSA-N 2-ethylhexan-1-ol Chemical compound CCCCC(CC)CO YIWUKEYIRIRTPP-UHFFFAOYSA-N 0.000 description 1
- 240000008042 Zea mays Species 0.000 description 1
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 description 1
- 235000002017 Zea mays subsp mays Nutrition 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 150000008359 benzonitriles Chemical class 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000006482 condensation reaction Methods 0.000 description 1
- 235000005822 corn Nutrition 0.000 description 1
- AJIPIJNNOJSSQC-NYLIRDPKSA-N estetrol Chemical compound OC1=CC=C2[C@H]3CC[C@](C)([C@H]([C@H](O)[C@@H]4O)O)[C@@H]4[C@@H]3CCC2=C1 AJIPIJNNOJSSQC-NYLIRDPKSA-N 0.000 description 1
- 230000002363 herbicidal effect Effects 0.000 description 1
- 239000004009 herbicide Substances 0.000 description 1
- 239000002808 molecular sieve Substances 0.000 description 1
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 1
- UMJSCPRVCHMLSP-UHFFFAOYSA-N pyridine Natural products COC1=CC=CN=C1 UMJSCPRVCHMLSP-UHFFFAOYSA-N 0.000 description 1
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 1
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- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Steroid Compounds (AREA)
Abstract
A process for reducing the levels of undesirable impurities in a mesotrione sample is disclosed, said process comprising the steps of: (i) forming a mesotrione enolate solution in an aqueous solvent, (ii) carrying out one or more purification processes, and (iii) crystallising the purified mesotrione out of solution.
Description
The present invention relates to reduce the novel method of impurity level in the mesotrione sample.
Mesotrione (2-(2 '-nitro-4 '-methyl sulphonyl benzoyl)-hydroresorcinol) is selective corn herbicide and has formula (I) structure:
Shown in the reacting flow chart of the face that is prepared as follows of mesotrione, the reaction of 2-nitro-4-methyl alkylsulfonyl Benzoyl chloride and cyclohexanedione generates enol ester, with after rearrangement reaction generates mesotrione:
2-nitro-4-methylsulfonyl Benzoyl chloride (NMSBC) is by corresponding 2-nitro-4-methyl sulfonylbenzoic acid (NMSBA) preparation, and NMSBA is again by oxidation 2-nitro-4-methylsulfonyl toluene (NMST) preparation.More detailed preparation route can be referring to US4695673.
But we have found that this method causes existing the impurity of undesirable level usually in final mesotrione product.A kind of method that we have found to reduce impurity is to make NMSBA carry out purification step before being converted into NMSBC, as described in detail among the WO02/076934.But purifying NMSBA can't always guarantee not contain in the finished product or contain enough low-level these impurity.
Therefore, the purpose of this invention is to provide and reduce improving one's methods of impurity level in the mesotrione sample.
Therefore, the invention provides a kind of method that reduces impurity level in the mesotrione sample, described method comprises the steps:
(i) in water-containing solvent, form mesotrione enolate solution,
(ii) carry out one or more purification process, and
(iii) crystallization goes out the mesotrione of purifying from solution.
Randomly, this method can further comprise distilation steps, and it suitably carried out before forming the mesotrione enolate.Usually, this distilation steps will be only, although be not necessary, is used to prepare when not separating its product behind the mesotrione.
Can be by adding suitable alkali for example NaOH, KOH, NH
4OH, pyridine or triethylamine and form enolate solution aptly, form enolate by adding NaOH or KOH.Aptly, water-containing solvent is a water, but may need under the certain situation other solvent for example acetonitrile, methyl alcohol, ethanol, acetone, dimethyl formamide etc. to guarantee the dissolving fully of mesotrione enolate.Mesotrione enolate solution forms at pH 6-13 aptly.
Described one or more purification process can be selected from following:
(a) filter,
(b) use suitable sorbent material such as absorption such as carbon, clay,
(c) extraction with an organic solvent, or
(d) decant.
Can carry out the purification process of any number of times and they can carry out with any order.Aptly, carry out at least two kinds of purification process and preferably at least three kinds.This purification process now is described in further detail.
Filter to remove any insoluble impurities that is retained in the mesotrione enolate solution.This filtration can be undertaken by any proper method well known by persons skilled in the art.
Adsorption treatment has been adsorbed the impurity in the mesotrione enolate solution.Be suitably with 1-30% and the mesotrione enolate solution that is preferably 8-11% with in batches or the successive mode contact several hours with carbon.The concentration of sorbent material solution is suitably 2-40% and preferred 10-20% with respect to the concentration of the mesotrione solution of enolate form.The pH of adsorption treatment is suitably pH 5 to 13, and is preferably pH9 to 11.
Carrying out organic solvent extraction anyly is dissolved in organic phase but is insoluble to the impurity of water to remove.Add organic solvent in the mesotrione enolate aqueous solution and some impurity will be preferably dissolved in the organic phase, remove organic phase then and throw aside." washing " mesotrione enolate aqueous solution several times with an organic solvent, as once, twice, three times, four inferior or in the adverse current king-post Continuous Contact.Unlikely needs are surpassed four times " washing ", may after " washing " of this number of times, be removed because be dissolved in all impurity of organic solvent.Suitable organic solvent is known to those skilled in the art, can comprise benzonitrile, acetonitrile/dimethylbenzene, dimethylbenzene, methylene dichloride, MIBK, ether, normal hexane and 1, the 2-ethylene dichloride.
In brief, decant is meant and removes any organic solvent from solution.If the mesotrione product does not separate after its preparation and do not carry out distilation steps, organic solvent is retained in the mesotrione enolate aqueous solution probably so.Removing organic solvent will remove and be dissolved in this organic solvent but any impurity in the water insoluble solution.
Optional distilation steps before forming mesotrione enolate solution, carry out aptly and will remove above-mentioned condensation/rearrangement reaction after residual any organic solvent.
Crystallisation step can carry out by any method known to those skilled in the art.For example, this operation can be method in batches, the method for half batch or the method for continuous crystallisation.Described crystallization adds sour example hydrochloric acid by reducing the pH of mesotrione enolate solution for example controlledly, carries out.Can use mesotrione seed assisting crystallisation process.Randomly, can add water-soluble solvent, because having of water-soluble solvent such as acetonitrile helps reduce the impurity level that exist this moment.
In specific embodiments of the present invention, this method comprises: distilation steps; Form mesotrione enol solution, preferred enolization potassium; One or more purification steps; And crystallization mesotrione.
In second specific embodiments of the present invention, this method comprises: form mesotrione enol solution, preferred enolization potassium solution; Decant, filtration and the adsorption treatment of carrying out with any order (although preferably at first carry out decant operation); And crystallization mesotrione.
By implementing method of the present invention, the impurity level in the final mesotrione product is reduced to acceptable level.
The further advantage of the inventive method is that it can be integrated among the preparation method of mesotrione, has eliminated the needs that separate thick mesotrione and carry out purifying afterwards thus.Therefore, the present invention provides the preparation/purification process of the integration of mesotrione on the other hand, and described method comprises the steps:
(i) make the reaction of cyclohexanedione and 2-nitro-4-methylsulfonyl Benzoyl chloride (NMSBC) form enol ester, with after rearrangement process obtains mesotrione;
(ii) form the mesotrione enolate aqueous solution;
(iii) carry out one or more purification process; And
(iv) crystallization goes out the mesotrione of purifying from solution.
Randomly, this method can further comprise distilation steps, and it suitably carried out before forming the mesotrione enolate.
Randomly, NMSBC at first handles through carbon sublimated.
Thus, a specific embodiments of this aspect of the present invention provides the preparation/purification process of the integration of mesotrione, described method comprises: make the reaction of cyclohexanedione and 2-nitro-4-methylsulfonyl Benzoyl chloride (NMSBC) form enol ester, with after rearrangement process obtains mesotrione; Distilation steps; Form mesotrione enolization potassium solution; One or more purification process; And crystallization mesotrione.
Second specific embodiments of this aspect of the present invention provides the preparation/purification process of the integration of mesotrione, described method comprises: make the reaction of cyclohexanedione and 2-nitro-4-methylsulfonyl Benzoyl chloride (NMSBC) form enol ester, with after rearrangement process obtains mesotrione; Form mesotrione enolate solution, preferred enolization potassium solution; Decant, filtration and the adsorption treatment of carrying out with any order (although preferably at first carry out decant operation); And crystallization mesotrione.
In the past, in order to attempt to obtain to have the final mesotrione product of acceptable level impurity, must make thick NMSBA (by oxidation NMST preparation) carry out purification process, described in WO02/076934.Yet as mentioned above, this does not always make the impurity level in final mesotrione product enough be low to moderate acceptable level.Astoundingly, we have now found that if adopt method of the present invention, the purifying of NMSBA no longer is essential or only needs " part " purifying at the most, as disclosed two steps or three steps among single step purification rather than the WO02/076934; Just when use degree of purification lower or even during thick NMSBA, also can make the impurity that contains acceptable level in the final mesotrione product.Therefore, the present invention provides the preparation method of mesotrione on the other hand, and described method comprises:
(i) oxidation NMST generates thick NMSBA;
(ii) NMSBA is converted into NMSBC;
(iii) make the reaction of cyclohexanedione and 2-nitro-4-methylsulfonyl Benzoyl chloride (NMSBC) form enol ester, with after rearrangement process obtains mesotrione;
(iv) form the mesotrione enolate aqueous solution;
(v) carry out one or more purification process; With
(vi) crystallization goes out the mesotrione of purifying from solution.
Randomly, this method can further comprise the thick NMSBA of partial purification.
Randomly, this method can further comprise distilation steps, and it suitably carried out before forming the mesotrione enolate.
Thus, a specific embodiments of this aspect of the present invention provides the preparation method of mesotrione, and described method comprises: oxidation NMST generates thick NMSBA; The thick NMSBA of optional part purifying; NMSBA is converted into NMSBC; Make the reaction of cyclohexanedione and 2-nitro-4-methylsulfonyl Benzoyl chloride (NMSBC) form enol ester, with after rearrangement process obtains mesotrione; Distilation steps; Form mesotrione enolate solution, preferred enolization potassium; One or more purification steps; And crystallization mesotrione.
Second specific embodiments of this aspect of the present invention provides the preparation method of mesotrione, and described method comprises: oxidation NMST generates thick NMSBA; The thick NMSBA of optional part purifying; NMSBA is converted into NMSBC; Make the reaction of cyclohexanedione and 2-nitro-4-methylsulfonyl Benzoyl chloride (NMSBC) form enol ester, with after rearrangement process obtains mesotrione; Form mesotrione enolate solution; With any decant in sequence, filtration and adsorption treatment; And crystallization mesotrione.
The present invention now will only be described further by embodiment.
Embodiment 1
This embodiment handles the example that (using carbon as sorbent material) contains the previous isolating mesotrione of high-level impurity for solid absorption.Use pre-filtered other purifying option in these embodiments.
Table 1
| Embodiment number | Handle | Initial foreign matter content (PPM) | Handle rear impurity content (PPM) | Foreign matter content reduces % |
| 1A | Form the 10% enolate solution of pH9.5 with the isolating mesotrione of KOH dissolving.This mixture through pre-filtering and with filter after 15% carbon contacts 2.5 hours and according to the laboratory method crystallization in batches of standard. | 7900 | 2800 | 65% |
| 1B | Form the 10% enolate solution of pH9.5 with the isolating mesotrione of KOH dissolving.This mixture through pre-filtering and with filter after 15% carbon contacts 2.5 hours and according to the laboratory method crystallization in batches of standard. | 7400 | 4500 | 39% |
| 1C | Form the 10% enolate solution of pH9.5 with the isolating mesotrione of NaOH/ acetonitrile dissolving.This enolate through pre-filtering and with filter after 15% carbon contacts 2.5 hours and according to the laboratory method crystallization in batches of standard. | 7400 | 2300 | 69% |
| 1D | Form the 10% enolate solution of pH9.5 with the isolating mesotrione of NaOH/ acetonitrile dissolving.This enolate was handled 3 hours through pre-filtering and with 9% carbon bulk carbon.Filter described carbon and according to laboratory method this enolate of crystallization in flow reactor of standard. | 8800 | 1900 | 78% |
| 1E | Form the 10% enolate solution of pH9.5 with the isolating mesotrione of triethylamine dissolving.This enolate was handled 3 hours through pre-filtering and with 9% carbon bulk carbon.Filter described carbon and according to laboratory method this enolate of crystallization in flow reactor of standard. | 8800 | 3100 | 65% |
| 1F | Form the 10% enolate solution of pH9.5 with the isolating mesotrione of NaOH/ acetonitrile dissolving.This mixture contacts 2.5 hours through pre-filtering and with 15% carbon, filters afterwards and according to the laboratory method crystallization in batches of standard. | 7900 | 4600 | 42% |
| 1G | Form the 10% enolate solution of pH9.5 with the isolating mesotrione of NaOH dissolving.This mixture contacts 2.5 hours through pre-filtering and with 15% carbon, filters afterwards and according to the laboratory method crystallization in batches of standard. | 7400 | 4600 | 38％ |
Embodiment 2
This embodiment handles the previous isolating mesotrione that contains high-level impurity for solvent extraction.
Table 2
| Embodiment number | Handle | Initial foreign matter content (PPM) | Handle rear impurity content (PPM) | Foreign matter content reduces % |
| 2A | Form the 10% enolate solution of pH 12.5 with the isolating mesotrione of KOH dissolving.This mixture and 1, the contact of 2-ethylene dichloride, this is 1 years old, the 2-ethylene dichloride is through extraction, and residual water layer is according to the laboratory method crystallization in batches of standard. | 8000 | 4100 | 49% |
| 2B | Form the 10% enolate solution of pH 12.5 with the isolating mesotrione of KOH dissolving.This mixture contacts with benzonitrile, and this benzonitrile is through extraction, and residual water layer is according to the laboratory method crystallization in batches of standard. | 8000 | 4300 | 46％ |
Embodiment 3
This embodiment is for integrating the example of the mesotrione enolate in the adsorption treatment process.NMSBA through the standard method purifying is used as starting raw material.Distillating mixture and introduce the pre-filtering purification unit before enolization is handled.Different sorbent material load in the embodiment of following table, have been shown.
Table 3
| Embodiment number | Handle | Initial foreign matter content (PPM) | Handle rear impurity content (PPM) | Foreign matter content reduces % |
| 3A | Use standard method to prepare mesotrione from the NMSBA that crosses through the standard method purifying.After the distillation, form the enolate solution of pH9.5 with KOH.This mixture contacts 2 hours through pre-filtering and with 13% carbon, filters afterwards and according to the laboratory method crystallization in batches of standard. | 13800 | 11100 | 20% |
| 3B | Use standard method to prepare mesotrione from the NMSBA that crosses through the standard method purifying.After the distillation, form the enolate solution of pH9.5 with KOH.This mixture contacts 3.5 hours through pre-filtering and with 27% carbon, filters afterwards and according to the laboratory method crystallization in batches of standard. | 13800 | 5100 | 63% |
| 3C | Use standard method to prepare mesotrione from the NMSBA that crosses through the standard method purifying.After the distillation, form the enolate solution of pH9.5 with KOH.This mixture contacts 2 hours through pre-filtering and with 40% carbon, filters afterwards and according to the laboratory method crystallization in batches of standard. | 13800 | 5700 | 59% |
| 3D | Use standard method to prepare mesotrione from the NMSBA that crosses through the standard method purifying.After the distillation, form the enolate solution of pH9.5 with KOH.This mixture contacts 2 hours through pre-filtering and with 53% carbon, filters afterwards and according to the laboratory method crystallization in batches of standard. | 13800 | 5800 | 58% |
| 3E | Use standard method to prepare mesotrione from the NMSBA that crosses through the standard method purifying.After the distillation, form the enolate solution of pH9.5 with KOH.This mixture contacts 2 hours through pre-filtering and with 5% carbon, filters afterwards and according to the laboratory method crystallization in batches of standard. | 17900 | 15900 | 11% |
| 3F | Use standard method to prepare mesotrione from the NMSBA that crosses through the standard method purifying.After the distillation, form the enolate solution of pH9.5 with KOH.This mixture contacts 2 hours through pre-filtering and with 10% carbon, filters afterwards and according to the laboratory method crystallization in batches of standard. | 17900 | 15000 | 16% |
| 3G | Use standard method to prepare mesotrione from the NMSBA that crosses through the standard method purifying.After the distillation, form the enolate solution of pH9.5 with KOH.This mixture contacts 2 hours through pre-filtering and with 20% carbon, filters afterwards and according to the laboratory method crystallization in batches of standard. | 17900 | 12300 | 31％ |
Embodiment 4
This embodiment is the example of the mesotrione enolate in the adsorption treatment process of integrating.NMSBA through the standard method purifying is used as starting raw material.Distillating mixture and introduce the pre-filtering purification unit before enolate is handled.Use the different filtration condition in this embodiment table.
Table 4
| Embodiment number | Handle | Initial foreign matter content (PPM) | Handle rear impurity content (PPM) | Foreign matter content reduces % |
| 4A | Use standard method to prepare mesotrione from the NMSBA that crosses through the standard method purifying.After the distillation, form the enolate solution of pH7 with KOH.This mixture contacts 2 hours through pre-filtering and with 10% carbon, filters afterwards and according to the laboratory method crystallization in batches of standard. | 15800 | 7400 | 53% |
| 4B | Use standard method to prepare mesotrione from the NMSBA that crosses through the standard method purifying.After the distillation, form the enolate solution of pH7 with KOH.This mixture contacts 2 hours through pre-filtering and with 10% carbon, filters afterwards and according to the laboratory method crystallization in batches of standard. | 15800 | 7700 | 51% |
| 4C | Use standard method to prepare mesotrione from the NMSBA that crosses through the standard method purifying.After the distillation, form the enolate solution of pH9.5 with KOH.This mixture contacts 2 hours through pre-filtering and with 10% carbon, filters afterwards and according to the laboratory method crystallization in batches of standard. | 15800 | 10400 | 34% |
| 4D | Use standard method to prepare mesotrione from the NMSBA that crosses through the standard method purifying.After the distillation, form the enolate solution of pH9.5 with KOH.This mixture contacts 2 hours through pre-filtering and with 10% carbon, filters afterwards and according to the laboratory method crystallization in batches of standard. | 15800 | 8600 | 46％ |
Embodiment 5
This embodiment is the example of the mesotrione enolate in the solvent extraction treatment process of integrating.Thick NMSBA is as starting raw material.This mixture distills before enolization is handled.
Table 5
| Embodiment number | Handle | Initial foreign matter content (PPM) | Handle rear impurity content (PPM) | Foreign matter content reduces % |
| 5A | Use standard method to prepare mesotrione from thick NMSBA.After the distillation, form the enolate solution of pH13 with KOH.This mixture and 1, the contact of 2-ethylene dichloride, extraction 1, the 2-ethylene dichloride, and residual water layer is according to the laboratory method crystallization in batches of standard. | 11000 | 7800 | 29％ |
Embodiment 6
This embodiment is the example of the mesotrione enolate in the adsorption treatment process of integrating.Partially purified NMSBA is as starting raw material.This mixture distills before enolate is handled.
Table 6
| Embodiment number | Handle | Initial foreign matter content (PPM) | Handle rear impurity content (PPM) | Foreign matter content reduces % |
| 6A | Use standard method to prepare mesotrione from partially purified NMSBA.After the distillation, form the enolate solution of pH5 with NaOH and CAN.This mixture contacts 2 hours with 20% carbon, filters afterwards and according to the laboratory method crystallization in batches of standard. | 13300 | 6300 | 53% |
| 6B | Use standard method to prepare mesotrione from partially purified NMSBA.After the distillation, form the enolate solution of pH9 with NaOH and ACN.This mixture contacts 2 hours with 20% carbon, filters afterwards and according to the laboratory method crystallization in batches of standard. | 8500 | 4900 | 42％ |
Embodiment 7
This embodiment is the example of the mesotrione enolate in the king-post adsorption treatment process of integrating.Thick NMSBA is as starting raw material.This mixture distills before enolate is handled.
Table 7
| Embodiment number | Handle | Initial foreign matter content (PPM) | Handle rear impurity content (PPM) | Foreign matter content reduces % |
| 7A | Use the standard laboratory method to prepare mesotrione from thick NMSBA.After the distillation, form the enolate solution of pH9.5 with KOH.This mixture is through pre-filtering and by using the carbon post of 14.9% carbon.Sample is according to the laboratory method crystallization in batches of standard. | 11400 | 10500 | 8% |
| 7B | Use the standard laboratory method to prepare mesotrione from thick NMSBA.After the distillation, form the enolate solution of pH9.5 with KOH.This mixture is through pre-filtering and by using the carbon post of 5.08% carbon.Sample is according to the laboratory method crystallization in batches of standard. | 11400 | 10100 | 11% |
| 7C | Use the standard laboratory method to prepare mesotrione from thick NMSBA.After the distillation, form the enolate solution of pH9.5 with KOH.This mixture is through pre-filtering and by using the carbon post of 2.93% carbon.Sample is according to the laboratory method crystallization in batches of standard. | 11400 | 6600 | 42％ |
Embodiment 8
This embodiment is the example of the mesotrione enolate in the adsorption treatment process of integrating.NMSBA purifying or thick is as starting raw material.Introduce the TEA decant as purification unit.Mixture distills before enolate is handled.
Table 8
| Embodiment number | Handle | Initial foreign matter content (PPM) | Handle rear impurity content (PPM) | Foreign matter content reduces % |
| 8A | Use standard method to prepare mesotrione from thick NMSBA.Form the enolate solution of pH13 with KOH.Decant TEA, and enolate contacts 2 hours in pH9.5 with 20% carbon, filters afterwards and according to the laboratory method crystallization in batches of standard. | 11400 | 5600 | 51% |
| 8B | Use standard method to prepare mesotrione from thick NMSBA.After the distillation, form the enolate solution of pH13 with KOH.Decant TEA, and enolate contacts 2 hours in pH9.5 with 20% carbon, filters afterwards and according to the laboratory method crystallization in batches of standard. | 20600 | 8900 | 57% |
| 8C | Use standard method to prepare mesotrione from thick NMSBA.After the distillation, form the enolate solution of pH13 with KOH.Decant TEA, and enolate contacts 2 hours in pH9.5 with 20% carbon, filters afterwards and according to the laboratory method crystallization in batches of standard. | 15000 | 6300 | 58% |
| 8D | Use standard method to prepare mesotrione from the NMSBA of purifying.Form the enolate solution of pH13 with KOH.Decant TEA, and enolate contacts 2 hours in pH9.5 with 20% carbon, filters afterwards and according to the laboratory method crystallization in batches of standard. | 6300 | 3400 | 46% |
| 8E | Use standard method to prepare mesotrione from the NMSBA of purifying.Finish solvent distillation back forms pH13 with KOH enolate solution.Decant TEA, and enolate contacts 2 hours in pH9.5 with 20% carbon, filters afterwards and according to the laboratory method crystallization in batches of standard. | 7300 | 2900 | 60% |
| 8F | Use standard method to prepare mesotrione from the NMSBA of purifying.Finish solvent distillation back forms pH13 with KOH enolate solution.Decant TEA, and enolate contacts 2 hours in pH9.5 with 20% carbon, filters afterwards and according to the laboratory method crystallization in batches of standard. | 6600 | 3300 | 50％ |
Embodiment 9
Present embodiment is the example of the existence of acetonitrile in the crystallisation process for the influence of mesotrione foreign matter content.Carried out the purifying of integrating, it uses TEA decant purification unit and have acetonitrile in crystallisation process.This mixture of distillation before enolate is handled.Thick NMSBA is as initial feed.
Table 9
| Embodiment number | Handle | Initial foreign matter content (PPM) | Handle rear impurity content (PPM) | Foreign matter content reduces % |
| 9A | Use standard method to prepare mesotrione from thick NMSBA.After the solvent distillation, enolization potassium solution and the decant TEA of preparation pH13.Except in crystallisation process, existing the acetonitrile according to the laboratory method of standard this enolate of crystallization in batches. | 21800 | 12800 | 41% |
| 9B | Use standard method to prepare mesotrione from thick NMSBA.After the solvent distillation, enolization potassium solution and the decant TEA of preparation pH13.Except in crystallisation process, existing the acetonitrile according to the laboratory method of standard this enolate of crystallization in batches. | 21800 | 12800 | 41% |
| 9C | Use standard method to prepare mesotrione from thick NMSBA.After the solvent distillation, enolization potassium solution and the decant TEA of preparation pH13.Except in crystallisation process, existing the acetonitrile according to the laboratory method of standard this enolate of crystallization in batches. | 30900 | 9000 | 71％ |
Embodiment 10
Present embodiment is the method with the initial integration of thick NMSBA, and wherein part NMSBA purifying directly is incorporated in this method.Use decant and adsorption treatment purification unit in these embodiments.
Table 10
| Embodiment number | Handle | Initial foreign matter content (PPM) | Handle rear impurity content (PPM) | Foreign matter content reduces % |
| 10A | With the initial mesotrione for preparing in water of thick NMSBA, NMSBA is through partial purification and dephlegmate according to the method for integrating.Adding benzonitrile prepares NMSBA solution and distills residual water.Remove after the excess phosgene filtering inorganic salt from acyl chlorides.Carry out C/R by normal reaction conditions.Form the enolate solution of pH13 with KOH.Decant TEA contacts 2 hour in pH9.5 with 20% carbon with benzonitrile and enolate, filters afterwards and according to the laboratory method crystallization in batches of standard. | 2900 | 2500 | 53% |
| 10B | With the initial mesotrione for preparing in water of thick NMSBA, NMSBA is through partial purification and dephlegmate according to the method for integrating.Adding benzonitrile prepares NMSBA solution and distills residual water.Remove after the excess phosgene filtering inorganic salt from acyl chlorides.Carry out C/R by normal reaction conditions.Form the enolate solution of pH13 with KOH.Decant TEA contacts 2 hour in pH9.5 with 20% carbon with benzonitrile and enolate, filters afterwards and according to the laboratory method crystallization in batches of standard. | 2900 | 1100 | 62% |
| 10C | With the initial mesotrione for preparing in water of thick NMSBA, NMSBA is through partial purification and dephlegmate according to the method for integrating.Adding benzonitrile prepares NMSBA solution and distills residual water.Remove after the excess phosgene filtering inorganic salt from acyl chlorides.Carry out C/R by normal reaction conditions.Form the enolate solution of pH13 with KOH.Decant TEA contacts 2 hour in pH9.5 with 20% carbon with benzonitrile and enolate, filters afterwards and according to the laboratory method crystallization in batches of standard. | 2900 | 2100 | 28% |
| 10D | With the initial mesotrione for preparing in water of thick NMSBA, NMSBA is through partial purification and dephlegmate according to the method for integrating.Adding benzonitrile prepares NMSBA solution and distills residual water.Remove after the excess phosgene filtering inorganic salt from acyl chlorides.Carry out C/R by normal reaction conditions.Form the enolate solution of pH13 with KOH.Decant TEA contacts 2 hour in pH9.5 with 20% carbon with benzonitrile and enolate, filters afterwards and according to the laboratory method crystallization in batches of standard. | 2900 | 1600 | 45% |
| 10E | With the initial mesotrione for preparing in water of thick NMSBA, NMSBA is through partial purification and distillation according to the method for integrating | 2900 | 1900 | 34% |
| Remove and anhydrate.Adding benzonitrile prepares NMSBA solution and distills residual water.Remove after the excess phosgene filtering inorganic salt from acyl chlorides.Carry out C/R by normal reaction conditions.Form the enolate solution of pH13 with KOH.Decant TEA contacts 2 hour in pH9.5 with 20% carbon with benzonitrile and enolate, filters afterwards and according to the laboratory method crystallization in batches of standard. | ||||
| 10F | With the initial mesotrione for preparing in water of thick NMSBA, NMSBA is through partial purification and in pH 0.8 dephlegmate according to the method for integrating.Add the NMSBA solution of benzonitrile preparation 20% and distill residual water.Remove after the excess phosgene filtering inorganic salt from acyl chlorides.Carry out C/R by normal reaction conditions.Form the enolate solution of pH13 with KOH.Decant TEA contacts 2 hour in pH13 with 20% carbon with benzonitrile and enolate, filters afterwards and according to the laboratory method crystallization in batches of standard. | 2900 | 1500 | 48% |
| 10G | With the initial mesotrione for preparing in water of thick NMSBA, NMSBA is through partial purification and dephlegmate according to the method for integrating.Adding benzonitrile prepares NMSBA solution and distills residual water.Remove after the excess phosgene filtering inorganic salt from acyl chlorides.Carry out C/R by normal reaction conditions.Form the enolate solution of pH13 with KOH.Decant TEA contacts 2 hour in pH9.5 with 20% carbon with benzonitrile and enolate, filters afterwards and according to the laboratory method crystallization in batches of standard. | 4900 | 3100 | 37% |
| 10H | With the initial mesotrione for preparing in water of thick NMSBA, NMSBA is through partial purification and dephlegmate according to the method for integrating.Adding benzonitrile prepares NMSBA solution and distills residual water.Remove after the excess phosgene filtering inorganic salt from acyl chlorides.Carry out C/R by normal reaction conditions.Form the enolate solution of pH13 with KOH.Decant TEA contacts 2 hour in pH9.5 with 20% carbon with benzonitrile and enolate, filters afterwards and according to the laboratory method crystallization in batches of standard. | 3200 | 2500 | 22% |
| 10I | With the initial mesotrione for preparing in water of thick NMSBA, NMSBA is through partial purification and dephlegmate according to the method for integrating.Adding benzonitrile prepares NMSBA solution and distills residual water.Remove after the excess phosgene filtering inorganic salt from acyl chlorides.Carry out C/R by normal reaction conditions.Form the enolate solution of pH13 with KOH.Decant TEA contacts 2 hour in pH9.5 with 20% carbon with benzonitrile and enolate, filters afterwards and according to the laboratory method crystallization in batches of standard. | 3200 | 2000 | 38％ |
Embodiment 11
By add the dissolving of rare potassium hydroxide by the previous isolating mesotrione of thick NMSBA preparation to form 9.1%w/w enolization potassium solution, pH is respectively 7,9.5 and 11.By removing by filter residual solids very in a small amount.
Extraction
Use solvent (150ml) extraction mesotrione (183g) enolization aqueous solutions of potassium four times.Each time extraction back is separated each phase and is abandoned solvent phase.After the 4th extraction, reclaim mesotrione by continuous crystallisation from aqueous phase according to standard method.Analysis revealed impurity reduces (table 11A).Numeral in the bracket is to handle the per-cent of back residual impurity.
Table 11A
| Solvent | Impurity summation (%) in the mesotrione sample | |||
| Before | After the pH7 | After the pH9.5 | After the pH11 | |
| MIBK | 3.419 | 0.258(7.55％) | 1.305(38.2％) | 1.308(38.3％) |
| Ethyl acetate | 3.419 | 1.997(58.4％) | 1.941(56.8％) | 2.098(61.4％) |
| Benzonitrile | 3.419 | 1.991(58.2％) | 1.018(29.8％) | 1.652(48.3％) |
| 2-Ethylhexyl Alcohol | 5.627 | 0.182(3.2％) | 1.361(24.2％) | 1.217(21.6％) |
Absorption
In envrionment temperature (～25 ℃), mesotrione (183g) enolization aqueous solutions of potassium was stirred 30 minutes with the 5g sorbent material.By removing by filter this sorbent material and reclaiming mesotrione by continuous crystallisation from aqueous phase according to standard method.Analysis revealed impurity reduces (table 11B).Numeral in the bracket is to handle the per-cent of back residual impurity.
Table 11B
| Sorbent material | Impurity summation (%) in the mesotrione sample | |||
| Before | After the pH7 | After the pH9.5 | After the pH11 | |
| Ambersorb 348F | 5.627 | 0.383(6.81％) | 0.680(12.1％) | 0.171(3.04％) |
| Amberlite XAD4 | 5.627 | 0.892(15.9％) | 1.692(30.1％) | |
| Amberlite XAD16 | 3.419 | 0.245(7.17％) | 0.063(1.84％) | 0.145(4.24％) |
| Molecular sieve 5A | 5.627 | 1.414(25.1％) | 1.792(31.8％) | |
Claims (15)
1, reduce the method for undesirable impurity level in the mesotrione sample, said method comprising the steps of:
(i) in water-containing solvent, form mesotrione enolate solution,
(ii) carry out one or more purification process, and
(iii) crystallization goes out the mesotrione of purifying from solution.
2, according to the process of claim 1 wherein that this method further comprises distilation steps.
3, according to the method for claim 1 or 2, wherein one or more purification process are selected from: filtration, adsorption treatment, with an organic solvent extraction and decant.
4, reduce the method for undesirable impurity level in the mesotrione sample, described method comprises: distilation steps forms mesotrione enolate solution; One or more purification process; And crystallization mesotrione.
5, reduce the method for undesirable impurity level in the mesotrione sample, described method comprises: form mesotrione enolate solution; Decant, filtration and the adsorption treatment of carrying out with any order; And crystallization mesotrione.
6, the preparation/purification process of the integration of mesotrione said method comprising the steps of:
(i) make the reaction of cyclohexanedione and 2-nitro-4-methylsulfonyl Benzoyl chloride (NMSBC) form enol ester, with after rearrangement process obtains mesotrione;
(ii) form the mesotrione enolate aqueous solution;
(iii) carry out one or more purification process; With
(iv) crystallization goes out the mesotrione of purifying from solution.
7, according to the method for claim 6, wherein said method further comprises distilation steps.
8, according to the method for claim 6 or 7, wherein NMSBC at first handles through carbon sublimated.
9, the preparation/purification process of the integration of mesotrione, described method comprises: make the reaction of cyclohexanedione and 2-nitro-4-methylsulfonyl Benzoyl chloride (NMSBC) form enol ester, with after rearrangement process obtains mesotrione; Distilation steps; Form mesotrione enolate solution; One or more purification steps; And crystallization mesotrione.
10, the preparation/purification process of the integration of mesotrione, described method comprises: make the reaction of cyclohexanedione and 2-nitro-4-methylsulfonyl Benzoyl chloride (NMSBC) form enol ester, with after rearrangement process obtains mesotrione; Form mesotrione enolate solution; Decant, filtration and the adsorption treatment of carrying out with any order; And crystallization mesotrione.
11, the preparation method of mesotrione, described method comprises:
(i) oxidation NMST generates thick NMSBA;
(ii) NMSBA is converted into NMSBC;
(iii) make the reaction of cyclohexanedione and 2-nitro-4-methylsulfonyl Benzoyl chloride (NMSBC) form enol ester, with after rearrangement process obtains mesotrione;
(iv) form the mesotrione enolate aqueous solution;
(v) carry out one or more purification process; And
(vi) crystallization goes out the mesotrione of purifying from solution.
12, according to the method for claim 11, wherein this method further comprises the described thick NMSBA of partial purification.
13, claim 11 or 12 method, wherein this method further comprises distilation steps.
14, the preparation method of mesotrione, described method comprises: oxidation NMST generates thick NMSBA; The thick NMSBA of optional part purifying; NMSBA is converted into NMSBC; Make the reaction of cyclohexanedione and 2-nitro-4-methylsulfonyl Benzoyl chloride (NMSBC) form enol ester, with after rearrangement process obtains mesotrione; Distilation steps; Form mesotrione enolization potassium solution; One or more purification steps; And crystallization mesotrione.
15, the preparation method of mesotrione, described method comprises: oxidation NMST generates thick NMSBA; The thick NMSBA of optional part purifying; NMSBA is converted into NMSBC; Make the reaction of cyclohexanedione and 2-nitro-4-methylsulfonyl Benzoyl chloride (NMSBC) form enol ester, with after rearrangement process obtains mesotrione; Form mesotrione enolate solution; Decant, filtration and the adsorption treatment of carrying out with any order; And crystallization mesotrione.
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| GB0323090A GB0323090D0 (en) | 2003-10-02 | 2003-10-02 | Novel process |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100537530C (en) * | 2007-06-08 | 2009-09-09 | 浙江工业大学 | Synthesis process of sulcoatrione |
| CN102649774A (en) * | 2012-02-02 | 2012-08-29 | 北京颖泰嘉和生物科技有限公司 | Method of reducing cyanide in sulcotrione |
| CN103373946A (en) * | 2012-04-23 | 2013-10-30 | 中国中化股份有限公司 | Method for preparing mesotrione with stable crystal form |
| CN103588685A (en) * | 2013-10-18 | 2014-02-19 | 浙江省诸暨合力化学对外贸易有限公司 | Triketone ammonium salt compounds and preparation method and application thereof |
| WO2016197900A1 (en) * | 2015-06-08 | 2016-12-15 | Rotam Agrochem International Company Limited | Process for preparing mesotrione |
| CN106699616A (en) * | 2016-11-17 | 2017-05-24 | 北京颖泰嘉和生物科技股份有限公司 | Purification method of new 2-nitro-4-methylsulfonylbenzoic acid |
| CN111440099A (en) * | 2020-04-09 | 2020-07-24 | 利民化学有限责任公司 | Purification method of tembotrione product |
| CN111909066A (en) * | 2020-06-24 | 2020-11-10 | 天津大学 | Crystallization treatment method for improving quality of mesotrione product |
| CN114671789A (en) * | 2021-10-25 | 2022-06-28 | 上虞颖泰精细化工有限公司 | Method for continuous crystallization of mesotrione |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103910659B (en) * | 2013-11-04 | 2016-05-11 | 迈克斯(如东)化工有限公司 | Process for purification and the intermediate thereof of 2-nitro-4-methyl sulfonylbenzoic acid |
| CN105712912B (en) * | 2014-12-02 | 2017-09-01 | 浙江省诸暨合力化学对外贸易有限公司 | A kind of preparation method of trione compounds and its intermediate |
| CN110078647B (en) * | 2019-05-15 | 2021-04-13 | 北京颖泰嘉和生物科技股份有限公司 | Post-treatment method of mesotrione reaction product |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB9725135D0 (en) * | 1997-11-27 | 1998-01-28 | Zeneca Ltd | Chemical process |
| WO2002076934A2 (en) * | 2001-03-26 | 2002-10-03 | Syngenta Limited | Purification of 2-nitro-4-methylsulphonylbenzoic acid |
-
2003
- 2003-10-02 GB GB0323090A patent/GB0323090D0/en not_active Ceased
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2004
- 2004-01-10 UA UAA200604618A patent/UA82722C2/en unknown
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- 2004-10-01 CN CNB2004800281851A patent/CN100378071C/en not_active Expired - Lifetime
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| CN100537530C (en) * | 2007-06-08 | 2009-09-09 | 浙江工业大学 | Synthesis process of sulcoatrione |
| CN102649774A (en) * | 2012-02-02 | 2012-08-29 | 北京颖泰嘉和生物科技有限公司 | Method of reducing cyanide in sulcotrione |
| CN103373946A (en) * | 2012-04-23 | 2013-10-30 | 中国中化股份有限公司 | Method for preparing mesotrione with stable crystal form |
| CN103373946B (en) * | 2012-04-23 | 2015-04-29 | 中国中化股份有限公司 | Method for preparing mesotrione with stable crystal form |
| CN103588685A (en) * | 2013-10-18 | 2014-02-19 | 浙江省诸暨合力化学对外贸易有限公司 | Triketone ammonium salt compounds and preparation method and application thereof |
| CN103588685B (en) * | 2013-10-18 | 2016-01-13 | 浙江省诸暨合力化学对外贸易有限公司 | Three ketones ammonium salt compound and preparation method thereof and application |
| WO2016197900A1 (en) * | 2015-06-08 | 2016-12-15 | Rotam Agrochem International Company Limited | Process for preparing mesotrione |
| CN107922327A (en) * | 2015-06-08 | 2018-04-17 | 龙灯农业化工国际有限公司 | The method for preparing mesotrione |
| US10421714B2 (en) | 2015-06-08 | 2019-09-24 | Rotam Agrochem International Company Limited | Process for preparing mesotrione |
| CN106699616A (en) * | 2016-11-17 | 2017-05-24 | 北京颖泰嘉和生物科技股份有限公司 | Purification method of new 2-nitro-4-methylsulfonylbenzoic acid |
| CN111440099A (en) * | 2020-04-09 | 2020-07-24 | 利民化学有限责任公司 | Purification method of tembotrione product |
| CN111909066A (en) * | 2020-06-24 | 2020-11-10 | 天津大学 | Crystallization treatment method for improving quality of mesotrione product |
| CN114671789A (en) * | 2021-10-25 | 2022-06-28 | 上虞颖泰精细化工有限公司 | Method for continuous crystallization of mesotrione |
| CN114671789B (en) * | 2021-10-25 | 2023-11-03 | 上虞颖泰精细化工有限公司 | Method for continuously crystallizing mesotrione |
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| CN100378071C (en) | 2008-04-02 |
| GT200400195A (en) | 2005-05-02 |
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| ZA200601864B (en) | 2007-07-25 |
| GB0323090D0 (en) | 2003-11-05 |
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