WO2000048995A1 - Procede de preparation de disulfures de tetra-alkylthiurame - Google Patents
Procede de preparation de disulfures de tetra-alkylthiurame Download PDFInfo
- Publication number
- WO2000048995A1 WO2000048995A1 PCT/EP2000/000868 EP0000868W WO0048995A1 WO 2000048995 A1 WO2000048995 A1 WO 2000048995A1 EP 0000868 W EP0000868 W EP 0000868W WO 0048995 A1 WO0048995 A1 WO 0048995A1
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- WO
- WIPO (PCT)
- Prior art keywords
- disulfide
- alkylthiuram
- reaction
- tetra
- reaction mixture
- Prior art date
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Classifications
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C333/00—Derivatives of thiocarbamic acids, i.e. compounds containing any of the groups, the nitrogen atom not being part of nitro or nitroso groups
- C07C333/14—Dithiocarbamic acids; Derivatives thereof
- C07C333/30—Dithiocarbamic acids; Derivatives thereof having sulfur atoms of dithiocarbamic groups bound to other sulfur atoms
- C07C333/32—Thiuramsulfides; Thiurampolysulfides
Definitions
- the present invention relates to a new process for the preparation of tetra-alkylthiuram disulphides, in which a dialkylammonium dialkyldithiocarbamate is oxidized in aqueous solution with oxygen, in the presence of carbon disulphide, a dispersing agent and d 'a metal catalyst.
- a dialkyldithiocarbamate salt is first prepared in aqueous solution, by reaction between a dialkylamine and carbon disulfide in basic medium.
- the dialkyldithiocarbamate salt thus obtained is then oxidized to DTAT by various oxidants, for example hydrogen peroxide (patent DE 2,527,898), chlorine (US patents 2,751,415 and US
- 1.322.579 and FR 1.322.580 describe 2 very similar processes for the preparation of substituted thiuram disulfides, the first from alkali salts of substituted dithiocarbamic acids, the second from disubstituted secondary amines and carbon sulfide.
- the oxidation is produced by the oxygen in the air in the presence of phthalocyanines of group VIII metals as catalysts and the solvent can be water, the pH being maintained between 7 and 12.
- the yield of the first process reaches about 80% maximum, while it is limited to about 30% in the second.
- the solvent preferably used as reaction medium is an aromatic hydrocarbon, a low molecular weight alcohol, or a mixture of the latter with water.
- the yield is practically quantitative and the products obtained generally have sufficient purity so there is no need to further purify them.
- pure water the reaction is possible, but it is much slower and the yield and the selectivity are less good, which constitutes a considerable disadvantage.
- patent BE 892,144 a process is described which is essentially distinguished from that of patent BE 892,143 only by the fact that ammonia or a tertiary amine is added to the reactants, and that the choice of catalytic metals is wider. It would be interesting to have a DTAT synthesis process in which:
- the product obtained should be at a sufficiently high concentration in the reaction medium so that the latter can be directly spray-dried, without the need for filtration and washing giving mother liquors. whose disposition or processing would cause problems.
- the DTAT must above all be of high purity.
- the present invention relates to a process for the preparation of tetraalkylthiuram disulfides (DTAT), in which a dialkylammonium dialkyldithiocarbamate (DADTC) is oxidized in aqueous solution with oxygen, with the addition of carbon disulfide and in the presence of a metal catalyst, characterized in that the reaction is carried out in the presence of a synthetic dispersing agent, at a pH value of the reaction mixture of between 7.0 and 8.0.
- DTAT tetraalkylthiuram disulfides
- DADTC dialkylammonium dialkyldithiocarbamate
- alkyl groups of tetraalkylthiuram disulphides (DTAT) targeted by the present invention, as well as DADTCs used as reactants, are groups linear or branched, and they have from 1 to 8, preferably 1 to 4, carbon atoms. These groups are chosen from methyl, ethyl, propyl, isopropyl, butyl, isobutyl, sec.-butyl, tert.-butyl, pentyl, hexyl, etc. groups.
- any dispersing agent whether of the anionic or nonionic type, can be used according to the present invention.
- the dispersing agent is used in an amount of 0.1 to 3%, preferably 0.1 to 1% by weight, calculated on the theoretical amount of DTAT to be formed.
- This DADTC is in turn oxidized to DTAT following the first reaction.
- Alk. represents a linear or branched alkyl group having from 1 to 8 carbon atoms, as described above. If a temporary excess of carbon disulfide is admitted during oxidation, there is a risk of inhibiting oxidation, agglomeration of DTAT on the surfaces of the reactor and explosion of the gas phase. . If, on the contrary, too little carbon disulfide is admitted, there will be a temporary excess of dialkylamine which will lead to the formation of side products and a loss of selectivity for DTAT.
- the solution to this problem consists in automatically regulating the flow rate of carbon disulfide as a function of the pH measured continuously in the reaction mixture.
- the pH is maintained between 7.0 and 7.3, which makes it possible to obtain a selectivity close to 99.5% in DTAT.
- the metal catalyst used in the synthesis of DTATs according to the present invention is chosen from copper, manganese, cerium, molybdenum, vanadium and their compounds.
- catalysts copper, manganese and cerium are preferred because they are the most active.
- These catalysts can be used in elementary form, in the form of inorganic or organic salts, in the form of complexes or alternatively of oxides or hydroxides, alone or as a mixture.
- Copper for example can be used in the form of powder and in the form of a host of compounds such as cuprous and cupric oxides, chlorides and other cuprous and cupric halides, cuprous and cupric sulfides, alkaline chlorocuprates such as potassium, potassium tricyanocuprate, cupric and cupric acetates, thiocyanates and dithiocarbamates.
- Manganese in elementary powder form, manganese dioxide, manganese sulfate, manganese acetate and dithiocarbamate, potassium permanganate are well suited as catalysts.
- Cerium can also be used in elementary powder form, as dioxide, chloride, nitrate, sulphate, carbonate, sulphide, oxalate and complex chlorine salts.
- Vanadium and molybdenum can be used as oxides, chlorides, sulfates, alkaline molybdates, alkaline vanadates and well known complex salts.
- the metal catalyst is used in an amount of 0.5 to 100 mg, preferably from 1 to 10 mg of metal per 1 kg of tetraalkylthiuram disulfide to be formed.
- the best results are obtained according to the invention if the oxidation of DADTC is carried out at temperatures between ambient temperature and 120 ° C, preferably between 50 and 90 ° C, and under pressures between 1 and 20 atmospheres, preferably 2 and 10 atmospheres. The pressure is kept constant by adding oxygen until the end of the oxidation.
- DADTC in aqueous solution used as reagent in the process for preparing DTAT according to the present invention, can be obtained by methods well known to those skilled in the art, for example by reaction between dialkylamine in aqueous solution and disulfide of carbon. Aqueous solutions of high concentration of DADTC are easily obtained, which are very suitable as reagents according to the invention.
- the reaction mixture as obtained at the end of the reaction according to the process of the present invention can be treated in different ways, depending on the intended use of the DTAT it contains.
- the reaction mixture is filtered, the filter cake is washed to remove the dispersing agent and the traces of products secondary formed and dried.
- a product thus obtained can also be used to prepare formulations for agrochemicals.
- DTAT formed is intended immediately for agrochemical uses, it is not necessary to further purify the reaction mixture which can be directly spray-dried, as it is, to provide DTAT usable as fungicide.
- the DTAT will essentially be tetramethylthiuram disulfide.
- the present invention also relates to a process for the preparation of tetraalkylthiuram disulfide (DTAT), characterized in that:
- a DTAT is prepared according to its aforementioned preparation process; “The reaction mixture obtained according to this process is directly spray-dried. Alternatively for agrochemical applications in the form of water-dispersible granules, the reaction mixture containing the DTAT suspension can be ground to a sufficiently fine particle size, adding the usual ingredients such as a supplement of dispersion, wetting agents and inert fillers, and granulate the mixture by spraying. This is why, the present invention also relates to a process for the preparation of water-dispersible granules containing a tetraalkylthiuram disulfide (DTAT), characterized in that: • a DTAT is prepared according to its aforementioned preparation process;
- DTAT tetraalkylthiuram disulfide
- the process for preparing DTAT by oxygen oxidation of DADTC in aqueous solution, in the presence of a metal catalyst and a dispersing agent, according to the present invention, has many advantages:
- reaction medium is water, which avoids the numerous drawbacks of organic solvents
- the oxygen used as an oxidant is inexpensive and non-toxic, unlike other oxidants used in the prior art to prepare DTATs (chlorine, nitrite, etc.); • for agrochemical applications, the almost non-existent formation of secondary products makes it possible to use the reaction mixture containing the DTAT directly, without prior filtration, which avoids filtration cakes and washing water; therefore, the process is economical and not harmful to the environment;
- a reactor supporting pressures of 20 atmospheres or more comprising an agitator of a type ensuring good contact between the liquid phase and the gaseous atmosphere above the liquid.
- the reactor is first loaded with the aqueous solution of DADTC and then the catalyst, the dispersing agent and water are added in such a quantity as to obtain at the end of the reaction a suspension containing between 35 and 45 % of
- oxygen is added to a pressure of 1 to 20 atmospheres. Then, the contents of the reactor are heated to a temperature high enough to initiate the oxidation reaction.
- the temperature is maintained at a fixed value (between ambient temperature and
- the initial pressure is maintained by constant addition of oxygen, regulated by a pressure switch.
- the pH of the reaction mixture is maintained between 7.0 and 8.0 by continuous addition of carbon sulfide, regulated by an automatic valve actuated by a pH-stat signal.
- reaction is complete when the consumption of oxygen and carbon sulphide stop.
- the reactor is then emptied and the last traces of carbon sulphide are removed by entrainment by means of a stream of nitrogen.
- reaction mixture is then treated as explained above. Either it is filtered, washed and dried, or it is dried directly by spraying in a dryer, like for example an atomizer, a fluidized bed or a "flash-drier" (according to English terminology).
- the temperature of the reactor is brought to 80 ° C. and oxygen is added up to a pressure of 4 atmospheres.
- Oxygen consumption begins as soon as it is added and the pressure is kept constant by continual addition of oxygen.
- Oxygen consumption is determined using a flow meter.
- carbon disulfide is admitted to the reactor.
- the reaction mixture is filtered and the filter cake is washed with demineralized water and dried. 355 g of tetramethylthiuram disulphide are obtained, ie a yield of 99.1% relative to the theoretical value.
- the product has a melting point of 153.3 ° C.
- Example 2 The procedure is as in Example 1, with the same quantities of reagents, at the same concentrations and in the same apparatus, omitting however to control the operation of the piston pump delivering the carbon disulfide to the electrode measuring the pH. of the reaction mixture. Conversely, carbon disulfide is added to the reactor by manually adjusting the flow rate of the pump, gradually reducing this flow rate as the oxygen is consumed in the reaction. Oxygen consumption stops after 120 minutes. 329 g of tetramethylthiuram disulfide are thus obtained, which represents a yield of 91.8%.
- DTMT tetramethylthiuram disulfide
- Supragil GN brand name of sodium phenysulfonate sold by the company Rhône-Poulenc Geronazzo S. p. AT.;
- Supragil MNS90 brand name of sodium methylnaphthalenesulfonate marketed by the same company
- Soprophor FL brand name of an ethoxylated polyaiylphenol phosphate marketed by the company Rhône-Poulenc Geronazzo SpA;
- Example 11 The procedure is as in Example 11, however using 160 g of Supragil GN and 660 mg of manganese sulphate, ie 5 mg of manganese for 1 kg of tetramethylthiuram disulphide which it is theoretically possible to obtain. Oxygen consumption stopped after 150 minutes, and a total of 10.190 kg of carbon disulfide was added (133.83 moles). After elimination of the traces of residual carbon disulfide by means of a stream of nitrogen, filtration, washing and drying of the filter cake, 31.750 kg of a tetramethylthiuram disulfide are obtained, the melting point of which is 153, 5 ° C, or a yield of 98.75% of the theoretical value.
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP00903668A EP1153012A1 (fr) | 1999-02-19 | 2000-02-03 | Procede de preparation de disulfures de tetra-alkylthiurame |
AU25465/00A AU2546500A (en) | 1999-02-19 | 2000-02-03 | Method for preparing tetra-alkylthiuram disulphides |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BE9900115 | 1999-02-19 | ||
BE9900115A BE1013030A3 (fr) | 1999-02-19 | 1999-02-19 | Procede de preparation de disulfures de tetra-alkylthiurame. |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2000048995A1 true WO2000048995A1 (fr) | 2000-08-24 |
Family
ID=3891772
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2000/000868 WO2000048995A1 (fr) | 1999-02-19 | 2000-02-03 | Procede de preparation de disulfures de tetra-alkylthiurame |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1153012A1 (fr) |
AU (1) | AU2546500A (fr) |
BE (1) | BE1013030A3 (fr) |
WO (1) | WO2000048995A1 (fr) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
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CN114751847B (zh) * | 2022-05-07 | 2024-03-29 | 包头稀土研究院 | 稀土配合物及其制备方法和用途以及硫化橡胶组合物 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4459424A (en) * | 1981-02-16 | 1984-07-10 | Akzona Incorporated | Process for the preparation of thiuram disulfides |
JPH01261361A (ja) * | 1988-04-13 | 1989-10-18 | Oouchi Shinko Kagaku Kogyo Kk | ジペンタメチレンチウラムヘキサスルフィドの製造法 |
US5021603A (en) * | 1984-10-27 | 1991-06-04 | Akzo N.V. | Thiuram polysulfide production |
-
1999
- 1999-02-19 BE BE9900115A patent/BE1013030A3/fr active
-
2000
- 2000-02-03 WO PCT/EP2000/000868 patent/WO2000048995A1/fr active Search and Examination
- 2000-02-03 AU AU25465/00A patent/AU2546500A/en not_active Abandoned
- 2000-02-03 EP EP00903668A patent/EP1153012A1/fr not_active Withdrawn
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4459424A (en) * | 1981-02-16 | 1984-07-10 | Akzona Incorporated | Process for the preparation of thiuram disulfides |
US5021603A (en) * | 1984-10-27 | 1991-06-04 | Akzo N.V. | Thiuram polysulfide production |
JPH01261361A (ja) * | 1988-04-13 | 1989-10-18 | Oouchi Shinko Kagaku Kogyo Kk | ジペンタメチレンチウラムヘキサスルフィドの製造法 |
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 014, no. 020 (C - 676) 17 January 1990 (1990-01-17) * |
Also Published As
Publication number | Publication date |
---|---|
AU2546500A (en) | 2000-09-04 |
BE1013030A3 (fr) | 2001-08-07 |
EP1153012A1 (fr) | 2001-11-14 |
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