WO2023105153A1 - Method for producing tetrahydrothiophene - Google Patents
Method for producing tetrahydrothiophene Download PDFInfo
- Publication number
- WO2023105153A1 WO2023105153A1 PCT/FR2022/052248 FR2022052248W WO2023105153A1 WO 2023105153 A1 WO2023105153 A1 WO 2023105153A1 FR 2022052248 W FR2022052248 W FR 2022052248W WO 2023105153 A1 WO2023105153 A1 WO 2023105153A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- catalyst
- tetrahydrothiophene
- reaction
- alumina
- temperature
- Prior art date
Links
- RAOIDOHSFRTOEL-UHFFFAOYSA-N tetrahydrothiophene Chemical compound C1CCSC1 RAOIDOHSFRTOEL-UHFFFAOYSA-N 0.000 title claims abstract description 31
- 238000004519 manufacturing process Methods 0.000 title abstract description 9
- WERYXYBDKMZEQL-UHFFFAOYSA-N butane-1,4-diol Chemical compound OCCCCO WERYXYBDKMZEQL-UHFFFAOYSA-N 0.000 claims abstract description 41
- 239000003054 catalyst Substances 0.000 claims abstract description 33
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 26
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 claims abstract description 25
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000007789 gas Substances 0.000 claims abstract description 16
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 13
- KKCBUQHMOMHUOY-UHFFFAOYSA-N sodium oxide Chemical compound [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229910001948 sodium oxide Inorganic materials 0.000 claims abstract description 9
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 7
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 claims description 34
- 238000006243 chemical reaction Methods 0.000 claims description 19
- 238000000034 method Methods 0.000 claims description 18
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 claims description 11
- 239000012071 phase Substances 0.000 claims description 7
- 239000012074 organic phase Substances 0.000 claims description 5
- 239000008346 aqueous phase Substances 0.000 claims description 3
- 238000004821 distillation Methods 0.000 claims description 3
- 238000000746 purification Methods 0.000 claims description 3
- 229910000287 alkaline earth metal oxide Inorganic materials 0.000 claims description 2
- 238000009833 condensation Methods 0.000 claims description 2
- 230000005494 condensation Effects 0.000 claims description 2
- 238000010908 decantation Methods 0.000 claims description 2
- 238000011084 recovery Methods 0.000 claims description 2
- 238000000926 separation method Methods 0.000 claims description 2
- 229910052799 carbon Inorganic materials 0.000 abstract 1
- 230000003197 catalytic effect Effects 0.000 description 12
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000003153 chemical reaction reagent Substances 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 238000003786 synthesis reaction Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000000376 reactant Substances 0.000 description 2
- 229910052815 sulfur oxide Inorganic materials 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- 238000003916 acid precipitation Methods 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000007857 degradation product Substances 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 239000002638 heterogeneous catalyst Substances 0.000 description 1
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000007086 side reaction Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- XTQHKBHJIVJGKJ-UHFFFAOYSA-N sulfur monoxide Chemical class S=O XTQHKBHJIVJGKJ-UHFFFAOYSA-N 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D333/00—Heterocyclic compounds containing five-membered rings having one sulfur atom as the only ring hetero atom
- C07D333/02—Heterocyclic compounds containing five-membered rings having one sulfur atom as the only ring hetero atom not condensed with other rings
- C07D333/04—Heterocyclic compounds containing five-membered rings having one sulfur atom as the only ring hetero atom not condensed with other rings not substituted on the ring sulphur atom
- C07D333/06—Heterocyclic compounds containing five-membered rings having one sulfur atom as the only ring hetero atom not condensed with other rings not substituted on the ring sulphur atom with only hydrogen atoms, hydrocarbon or substituted hydrocarbon radicals, directly attached to the ring carbon atoms
- C07D333/08—Hydrogen atoms or radicals containing only hydrogen and carbon atoms
Definitions
- the present invention relates to a process for the production of tetrahydrothiophene leading to an improved yield.
- Tetrahydrothiophene is a compound of great industrial interest. It is known to be used as an additive in consumable gases to detect possible leaks due to its very characteristic smell. It is therefore present in the gas injected into the domestic supply network, in the gas transport networks, in the storage devices and in the interconnections with the other gas transport networks.
- THT tetrahydrothiophene
- BDO 1,4-butanediol
- THF tetrahydrofuran
- H2S hydrogen sulphide
- the second step is the transformation of THF, in the presence of H2S, into THT according to the following reaction:
- this synthesis can generate degradation products, such as CO2, ethylene and C1 to C4 mercaptans.
- An object of the present invention is to provide a process for the preparation of more efficient tetrahydrothiophene.
- the present inventors have surprisingly discovered that the choice of a particular catalyst associated with a particular temperature range makes it possible to significantly increase the yield of the reaction.
- the choice of the catalyst makes it possible to significantly lower the temperature of the reaction, allowing an energy saving. Moreover, the choice of this catalyst makes it possible to increase the yield of the reaction.
- the tetrahydrothiophene production process according to the invention is therefore more economical, has better performance, while being more environmentally friendly.
- the present invention relates to a process for producing tetrahydrothiophene comprising a step of reacting 1, 4-butanediol or tetrahydrofuran, in the presence of hydrogen sulphide (H2S), and optionally carbon dioxide in gas phase, at a temperature between 200 and 320° C., in the presence of alumina as catalyst comprising a sodium oxide content of less than 0.3% by weight relative to the total weight of the catalyst.
- H2S hydrogen sulphide
- the method according to the invention comprises a step of reacting 1,4-butanediol or tetrahydrofuran, in the presence of hydrogen sulphide (H2S), and optionally carbon dioxide in the gas phase, at a temperature between 200 and 320° C., in the presence of alumina as catalyst comprising a sodium oxide content of less than 0.3% by weight relative to the total weight of the catalyst.
- H2S hydrogen sulphide
- gas streams of hydrogen sulphide and 1,4-butanediol or tetrahydrofuran, each in gaseous form, are introduced into a reactor.
- These reagents can arrive in the reactor via the same flow or else separately.
- the reactants arrive via the same flow, the flow of hydrogen sulphide being heated beforehand and allowing the liquid flow of 1,4-butanediol or tetrahydrofuran to be vaporized.
- 1,4-butanediol is used as reagent.
- the reaction takes place in the gas phase and preferably continuously.
- the Catalyst can be in a fixed bed in a multitubular reactor or not, isothermal or adiabatic, with plates.
- a multizone reactor or several reactors in series with identical or different catalysts with multi-injection of BDO or THF, or not, can also be used.
- the catalyst used is preferably an alumina having a sodium oxide content of between 0% and 0.1% by weight, preferably between 0 and 0.08% and more particularly between 0.03% and 0, 08% by weight relative to the total weight of the catalyst.
- the catalyst may comprise a maximum content of alkaline oxides and alkaline-earth oxides of less than 0.3% by weight relative to the total weight of the catalyst.
- the catalyst used is an undoped alumina. It is a pure alumina.
- the sodium oxide content of less than 0.3% by weight relative to the total weight of the catalyst takes into account the sodium oxide, which comes from the alumina preparation process.
- it is not modified before its introduction into the reactor. In particular, it does not undergo any surface treatment.
- the alumina may include sodium oxide, but in a content of less than 0.3% by weight relative to the total weight of the catalyst.
- the catalyst can be dried using an inert gas, such as nitrogen, when it is placed in the reactor.
- an inert gas such as nitrogen
- the reactants are introduced into the reactor sequentially.
- Hydrogen sulfide can be introduced into the reactor first, and 1,4-butanediol or tetrahydrofuran can be introduced second.
- the catalyst is placed in the reactor, then dried, then the hydrogen sulphide is introduced first, then the 1,4-butanediol or tetrahydrofuran is introduced second into the reactor.
- the reaction is advantageously carried out at a temperature between 220 and 320°C, preferably between 220 and 280°C. It is preferably carried out under a pressure of between 1 and 100 bars, preferably between 1 and 50 bars.
- the molar ratio of hydrogen sulphide relative to 1,4-butanediol is between 0.1 and 100, preferably between 0, 1 and 50, more preferably between 0.5 and 10.
- the molar ratio of hydrogen sulphide relative to tetrahydrofuran is between 0.1 and 100, preferably between 0.1 and 50, even more preferably between 0.5 and 10.
- the reaction is carried out lised in the presence of carbon dioxide in the gas phase, at a temperature between 220 and 280°C.
- the method according to the invention may comprise the following successive steps: b) condensation of the flow resulting from the reaction step defined above to obtain a flow rich in tetrahydrothiophene and gaseous vents containing the incondensables possibly formed at the outcome of the previous step; c) at least one stage of purification, preferably by decantation, of the flow rich in tetrahydrothiophene resulting from the preceding stage with separation of the aqueous phase, the organic phase and the gaseous vents; d) optionally at least one distillation of the organic phase from the previous step to isolate the tetrahydrothiophene from the gaseous vents; e) recovery of the tetrahydrothiophene isolated in the preceding steps c) and optionally d), steps b) and c) possibly being successive or simultaneous.
- the method may include intermediate purification steps.
- Example 1 Production of THT from BDO and acid gas (H2S/CO2)
- a tubular steel catalytic reactor 70 ml (49 g) of a catalyst consisting of an alumina containing 700 ppm of Na2O were introduced.
- the catalyst tested here is Spheralite 505® from Axens.
- the height of the catalytic bed is 15 cm.
- This reactor was fed with 43 g/h of BDO, 31.1 g/h of h ⁇ S and 32.9 g/h of CO2.
- the pressure in the reactor is kept constant at 3 bars absolute.
- the average temperature of the catalytic bed is 225°C.
- Example 2 Production of THT from BDO and pure H2S
- a tubular steel catalytic reactor In a tubular steel catalytic reactor, were introduced 70 ml (49 g) a catalyst consisting of an alumina containing 700 ppm of Na2O.
- the catalyst tested here is Spheralite 505® from Axens.
- the height of the catalytic bed is 15 cm.
- This reactor is fed with 43 g/h of BDO and 31.1 g/h of h ⁇ S
- the pressure in the reactor is kept constant at 3 bars absolute.
- the average temperature of the catalytic bed is 280°C.
- a tubular steel catalytic reactor 70 ml (52 g) of a catalyst consisting of an alumina containing 4000 ppm of Na2O are introduced.
- the catalyst tested here is Alumina A 2-5 from Axens.
- the height of the catalytic bed is 15 cm.
- This reactor is fed with 43 g/h of BDO, 31.1 g/h of H2S and 32.9 g/h of CO2.
- the pressure in the reactor is kept constant at 3 bar absolute.
- the average temperature of the catalytic bed is 220°C.
- Example 4 Production of THT from BDO and pure H2S
- a tubular steel catalytic reactor 70 ml (49 g) of a catalyst consisting of an alumina containing 700 ppm of Na2O were introduced.
- the catalyst tested here is Spheralite 505® from Axens.
- the height of the catalytic bed is 15 cm.
- This reactor is fed with 43 g/h of BDO and 31.1 g/h of H2S
- the pressure in the reactor is kept constant at 3 bars absolute.
- the average temperature of the catalytic bed is 280°C.
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)
- Heterocyclic Carbon Compounds Containing A Hetero Ring Having Oxygen Or Sulfur (AREA)
Abstract
The invention relates to a method for producing tetrahydrothiophene, comprising a step of reacting 1,4-butanediol or tetrahydrothiophene, in the presence of hydrogen sulfide (H2S), and optionally carbon dioxide in the gas phase, at a temperature of between 200 and 320° C, in the presence of alumina as a catalyst having a sodium oxide content of less than 0.3% by weight relative to the total weight of the catalyst.
Description
Procédé de production de tétrahydrothiophène Process for the production of tetrahydrothiophene
[0001] La présente invention concerne un procédé de production de tétrahydrothiophène conduisant à un rendement amélioré. The present invention relates to a process for the production of tetrahydrothiophene leading to an improved yield.
[0002] Le tétrahydrothiophène est un composé présentant un grand intérêt industriel. Il est connu pour être utilisé comme additif dans les gaz consommables pour déceler d’éventuelles fuites en raison de son odeur très caractéristique. De ce fait, il est présent dans le gaz injecté sur le réseau d’alimentation domestique, dans les réseaux de transport de gaz, dans les appareils de stockage et dans les interconnexions avec les autres réseaux de transport de gaz. [0002] Tetrahydrothiophene is a compound of great industrial interest. It is known to be used as an additive in consumable gases to detect possible leaks due to its very characteristic smell. It is therefore present in the gas injected into the domestic supply network, in the gas transport networks, in the storage devices and in the interconnections with the other gas transport networks.
[0003] Il est connu de synthétiser le tétrahydrothiophène, ci-après noté THT, à partir de 1 ,4-butanediol, ci-après noté BDO ou bien de tétrahydrofurane, noté THF, et de sulfure d’hydrogène, ci-après noté H2S en présence de catalyseur hétérogène. It is known to synthesize tetrahydrothiophene, hereinafter denoted THT, from 1,4-butanediol, hereinafter denoted BDO or else from tetrahydrofuran, denoted THF, and hydrogen sulphide, hereinafter denoted H2S in the presence of heterogeneous catalyst.
[0004] Il est admis dans la littérature, que la première étape in situ est la transformation du BDO en THF selon la réaction suivante : [0004] It is accepted in the literature that the first step in situ is the transformation of BDO into THF according to the following reaction:
1 ,4-BDO — >THF + H2O 1,4-BDO — >THF + H2O
[0005] La deuxième étape est la transformation du THF, en présence de H2S, en THT selon la réaction suivante : The second step is the transformation of THF, in the presence of H2S, into THT according to the following reaction:
THF + H2S - THT + H2O THF + H 2 S - THT + H 2 O
[0006] Or, les réactions secondaires suivantes peuvent se produire en fonction des conditions opératoires :
[0006] However, the following side reactions can occur depending on the operating conditions:
[0007] De plus, cette synthèse peut générer des produits de dégradation, tels que du CO2, de l’éthylène et des mercaptans en Ci à C4. [0007] In addition, this synthesis can generate degradation products, such as CO2, ethylene and C1 to C4 mercaptans.
[0008] Or, au regard des considérations écologiques actuelles, il existe aujourd'hui un réel besoin pour un procédé de synthèse de tétrahydrothiophène plus performant, c’est-à-dire dont le rendement est plus élevé et le taux de produits secondaires plus faibles. [0008] However, in view of current ecological considerations, there is now a real need for a more efficient tetrahydrothiophene synthesis process, that is to say one whose yield is higher and the level of secondary products is higher. weak.
[0009] En effet, ces produits secondaires ou sous-produits de réaction sont difficilement recyclables. Ils sont généralement incinérés, et conduisent à de fortes émissions d’oxydes de soufre (SO2) dans l’atmosphère, potentiellement responsables de pluies acides. Or, à l’heure actuelle, ces rejets ne sont plus tolérés. [0009] Indeed, these secondary products or reaction by-products are difficult to recycle. They are generally incinerated, and lead to strong emissions of sulfur oxides (SO2) in the atmosphere, potentially responsible for acid rain. However, at present, these rejections are no longer tolerated.
[0010] Un objectif de la présente invention est de fournir un procédé de préparation de tétrahydrothiophène plus performant.
[0011] Les présents inventeurs ont découvert de façon surprenante que le choix d’un catalyseur particulier associé à une gamme de température particulière permettait d’augmenter significativement le rendement de la réaction. An object of the present invention is to provide a process for the preparation of more efficient tetrahydrothiophene. [0011] The present inventors have surprisingly discovered that the choice of a particular catalyst associated with a particular temperature range makes it possible to significantly increase the yield of the reaction.
[0012] En d’autres termes, le choix du catalyseur permet de baisser significativement la température de la réaction permettant une économie énergétique. Par ailleurs, le choix de ce catalyseur permet d’augmenter le rendement de la réaction. [0012] In other words, the choice of the catalyst makes it possible to significantly lower the temperature of the reaction, allowing an energy saving. Moreover, the choice of this catalyst makes it possible to increase the yield of the reaction.
[0013] Le procédé de production de tétrahydrothiophène selon l’invention est donc plus économique, présente des meilleures performances, tout en étant plus respectueux de l’environnement. The tetrahydrothiophene production process according to the invention is therefore more economical, has better performance, while being more environmentally friendly.
Brève description de l’invention Brief description of the invention
[0014] Ainsi, la présente invention a pour objet un procédé de production de tétrahydrothiophène comprenant une étape de réaction de 1 ,4-butanediol ou de tétrahydrofurane, en présence de sulfure d’hydrogène (H2S), et éventuellement de dioxyde de carbone en phase gaz, à une température comprise entre 200 et 320°C, en présence d’alumine en tant que catalyseur comportant une teneur en oxyde de sodium inférieure à 0,3% en poids par rapport au poids total du catalyseur. Thus, the present invention relates to a process for producing tetrahydrothiophene comprising a step of reacting 1, 4-butanediol or tetrahydrofuran, in the presence of hydrogen sulphide (H2S), and optionally carbon dioxide in gas phase, at a temperature between 200 and 320° C., in the presence of alumina as catalyst comprising a sodium oxide content of less than 0.3% by weight relative to the total weight of the catalyst.
Description détaillée de l’invention Detailed description of the invention
[0015] D'autres caractéristiques, aspects, objets et avantages de la présente invention apparaîtront encore plus clairement à la lecture de la description qui suit. [0016] Il est précisé que les expressions « de ...à ... » et « compris entre ... et .... » utilisées dans la présente description doivent s’entendre comme incluant chacune des bornes mentionnées. [0015] Other characteristics, aspects, objects and advantages of the present invention will appear even more clearly on reading the description which follows. [0016] It is specified that the expressions "from ... to ..." and "between ... and ...." used in this description must be understood as including each of the terminals mentioned.
[0017] Le procédé selon l'invention comprend une étape de réaction de 1 ,4-butanediol ou de tétrahydrofurane, en présence de sulfure d’hydrogène (H2S), et éventuellement de dioxyde de carbone en phase gaz, à une température comprise entre 200 et 320°C, en présence d’alumine en tant que catalyseur comportant une teneur en oxyde de sodium inférieure à 0,3% en poids par rapport au poids total du catalyseur. The method according to the invention comprises a step of reacting 1,4-butanediol or tetrahydrofuran, in the presence of hydrogen sulphide (H2S), and optionally carbon dioxide in the gas phase, at a temperature between 200 and 320° C., in the presence of alumina as catalyst comprising a sodium oxide content of less than 0.3% by weight relative to the total weight of the catalyst.
[0018] Ainsi, des flux gazeux de sulfure d’hydrogène et de 1 ,4-butanediol ou de tétrahydrofurane, chacun sous forme gazeuse, sont introduits dans un réacteur. Ces réactifs peuvent arriver dans le réacteur via un même flux ou bien de manière séparée. De préférence, les réactifs arrivent via un même flux, le flux de sulfure d’hydrogène étant préalablement chauffé et permettant de vaporiser le flux liquide de 1 ,4-butanediol ou le tétrahydrofurane. Thus, gas streams of hydrogen sulphide and 1,4-butanediol or tetrahydrofuran, each in gaseous form, are introduced into a reactor. These reagents can arrive in the reactor via the same flow or else separately. Preferably, the reactants arrive via the same flow, the flow of hydrogen sulphide being heated beforehand and allowing the liquid flow of 1,4-butanediol or tetrahydrofuran to be vaporized.
[0019] De préférence, le 1 ,4-butanediol est utilisé en tant que réactif. [0019] Preferably, 1,4-butanediol is used as reagent.
[0020] La réaction se fait en phase gaz et de préférence en continu. Le catalyseur
peut être en lit fixe dans un réacteur multitubulaire ou non, isotherme ou adiabatique, à plaques. Un réacteur multizone ou plusieurs réacteurs en série avec des catalyseurs identiques ou différents avec multi-injection de BDO ou de THF, ou non, peuvent également être utilisés. The reaction takes place in the gas phase and preferably continuously. The Catalyst can be in a fixed bed in a multitubular reactor or not, isothermal or adiabatic, with plates. A multizone reactor or several reactors in series with identical or different catalysts with multi-injection of BDO or THF, or not, can also be used.
[0021] Le catalyseur utilisé est de préférence une alumine comportant une teneur en oxyde de sodium comprise entre 0% et 0,1 % en poids, de préférence entre 0 et 0,08% et plus particulièrement entre 0,03% et 0,08% en poids par rapport au poids total du catalyseur. The catalyst used is preferably an alumina having a sodium oxide content of between 0% and 0.1% by weight, preferably between 0 and 0.08% and more particularly between 0.03% and 0, 08% by weight relative to the total weight of the catalyst.
[0022] Le catalyseur peut comprendre une teneur maximale d’oxydes alcalin et d’oxydes alcalino- terreux inférieure à 0,3% en poids par rapport au poids total du catalyseur. The catalyst may comprise a maximum content of alkaline oxides and alkaline-earth oxides of less than 0.3% by weight relative to the total weight of the catalyst.
[0023] En d’autres termes, le catalyseur utilisé est une alumine non dopée. Il s’agit d’une alumine pure. La teneur en oxyde de sodium inférieure à 0,3% en poids par rapport au poids total du catalyseur tient compte de l’oxyde de sodium, qui provient du procédé de préparation de l’alumine. De préférence, il n’est pas modifié avant son introduction dans le réacteur. En particulier, il ne subit pas de traitement de surface. Ainsi, selon son mode de préparation, l’alumine peut comprendre de l’oxyde de sodium, mais en une teneur inférieure à 0,3% en poids par rapport au poids total du catalyseur. In other words, the catalyst used is an undoped alumina. It is a pure alumina. The sodium oxide content of less than 0.3% by weight relative to the total weight of the catalyst takes into account the sodium oxide, which comes from the alumina preparation process. Preferably, it is not modified before its introduction into the reactor. In particular, it does not undergo any surface treatment. Thus, depending on its method of preparation, the alumina may include sodium oxide, but in a content of less than 0.3% by weight relative to the total weight of the catalyst.
[0024] De préférence, le catalyseur peut être séché à l’aide d’un gaz inerte, tel que de l’azote, lorsqu’il est placé dans le réacteur. [0024] Preferably, the catalyst can be dried using an inert gas, such as nitrogen, when it is placed in the reactor.
[0025] Avantageusement, les réactifs sont introduits dans le réacteur de manière séquentielle. Le sulfure d’hydrogène peut être introduit en premier dans le réacteur, et le 1 ,4-butanediol ou le tétrahydrofurane peut être introduit en second. Advantageously, the reactants are introduced into the reactor sequentially. Hydrogen sulfide can be introduced into the reactor first, and 1,4-butanediol or tetrahydrofuran can be introduced second.
[0026] Selon un mode de réalisation préféré, le catalyseur est placé dans le réacteur, puis séché, ensuite le sulfure d’hydrogène est introduit en premier, puis le 1 ,4-butanediol ou le tétrahydrofurane est introduit en second dans le réacteur. [0027] La réaction est avantageusement réalisée à une température comprise entre 220 et 320°C, de préférence entre 220 et 280°C. Elle est de préférence est réalisée sous une pression comprise entre 1 et 100 bars, de préférence entre 1 et 50 bars. According to a preferred embodiment, the catalyst is placed in the reactor, then dried, then the hydrogen sulphide is introduced first, then the 1,4-butanediol or tetrahydrofuran is introduced second into the reactor. The reaction is advantageously carried out at a temperature between 220 and 320°C, preferably between 220 and 280°C. It is preferably carried out under a pressure of between 1 and 100 bars, preferably between 1 and 50 bars.
[0028] De préférence, lorsque le 1 ,4-butanediol est utilisé en tant que réactif, le ratio molaire de sulfure d’hydrogène par rapport au 1 ,4-butanediol est compris entre 0,1 et 100, de préférence entre 0,1 et 50, de manière encore préférée entre 0,5 et 10. [0028] Preferably, when 1,4-butanediol is used as a reagent, the molar ratio of hydrogen sulphide relative to 1,4-butanediol is between 0.1 and 100, preferably between 0, 1 and 50, more preferably between 0.5 and 10.
[0029] De préférence, lorsque le tétrahydrofurane est utilisé en tant que réactif, le ratio molaire de sulfure d’hydrogène par rapport au tétrahydrofurane est compris entre 0,1 et 100, de préférence entre 0,1 et 50, de manière encore préférée entre 0,5 et 10. [0029] Preferably, when tetrahydrofuran is used as a reagent, the molar ratio of hydrogen sulphide relative to tetrahydrofuran is between 0.1 and 100, preferably between 0.1 and 50, even more preferably between 0.5 and 10.
[0030] Selon un mode de réalisation particulier de l’invention, la réaction est réa-
lisée en présence de dioxyde de carbone en phase gaz, à une température comprise entre 220 et 280°C. [0030] According to a particular embodiment of the invention, the reaction is carried out lised in the presence of carbon dioxide in the gas phase, at a temperature between 220 and 280°C.
[0031] Il a été observé, que lorsque du dioxyde de carbone est présent dans la phase gaz, il est encore possible de diminuer en température et de limiter encore le coût énergétique de la synthèse. It has been observed that when carbon dioxide is present in the gas phase, it is still possible to reduce the temperature and further limit the energy cost of the synthesis.
[0032] Le procédé selon l’invention peut comprendre les étapes successives suivantes : b) condensation du flux issu de l’étape de réaction définie ci-dessus pour obtenir un flux riche en tétrahydrothiophène et des évents gazeux contenant les incondensables éventuellement formés à l’issue de l’étape précédente ; c) au moins une étape de purification, de préférence par décantation, du flux riche en tétrahydrothiophène issu de l’étape précédente avec séparation de la phase aqueuse, de la phase organique et des évents gazeux; d) éventuellement au moins une distillation de la phase organique issue de l’étape précédente pour isoler le tétrahydrothiophène des évents gazeux ; e) récupération du tétrahydrothiophène isolé aux étapes précédentes c) et éventuellement d), les étapes b) et c) pouvant être successives ou simultanées. The method according to the invention may comprise the following successive steps: b) condensation of the flow resulting from the reaction step defined above to obtain a flow rich in tetrahydrothiophene and gaseous vents containing the incondensables possibly formed at the outcome of the previous step; c) at least one stage of purification, preferably by decantation, of the flow rich in tetrahydrothiophene resulting from the preceding stage with separation of the aqueous phase, the organic phase and the gaseous vents; d) optionally at least one distillation of the organic phase from the previous step to isolate the tetrahydrothiophene from the gaseous vents; e) recovery of the tetrahydrothiophene isolated in the preceding steps c) and optionally d), steps b) and c) possibly being successive or simultaneous.
[0033] Le procédé peut comporter des étapes de purification intermédiaires. The method may include intermediate purification steps.
[0034] Les exemples, qui suivent permettent d’illustrer la présente invention, mais ne sont en aucun cas limitatifs. The examples which follow make it possible to illustrate the present invention, but are in no way limiting.
Exemples Examples
[0035] Exemple 1 selon l’invention : Production de THT à partir de BDO et de gaz acide (H2S/CO2) Example 1 according to the invention: Production of THT from BDO and acid gas (H2S/CO2)
[0036] Dans un réacteur catalytique tubulaire en acier, on a introduit 70 ml (49 g) d’un catalyseur constitué d’une alumine contenant 700 ppm de Na2O. Le catalyseur ici testé est la Sphéralite 505® de la société Axens. La hauteur du lit catalytique est de 15 cm. In a tubular steel catalytic reactor, 70 ml (49 g) of a catalyst consisting of an alumina containing 700 ppm of Na2O were introduced. The catalyst tested here is Spheralite 505® from Axens. The height of the catalytic bed is 15 cm.
[0037] On a alimenté ce réacteur avec 43 g/h de BDO, 31 .1 g/h d’h^S et 32.9 g/h de CO2. This reactor was fed with 43 g/h of BDO, 31.1 g/h of h^S and 32.9 g/h of CO2.
[0038] La pression dans le réacteur est maintenue constante à 3 bars absolus. The pressure in the reactor is kept constant at 3 bars absolute.
[0039] La température moyenne du lit catalytique est de 225°C. The average temperature of the catalytic bed is 225°C.
[0040] Dans ces conditions, on obtient une conversion de 100% du BDO et un rendement molaire en THT de 98%. Under these conditions, a conversion of 100% of the BDO and a molar yield of THT of 98% are obtained.
[0041 ] Exemple 2 selon l’invention : Production de THT à partir de BDO et de H2S pur [0041] Example 2 according to the invention: Production of THT from BDO and pure H2S
[0042] Dans un réacteur catalytique tubulaire en acier, on a introduit 70 ml (49 g)
d’un catalyseur constitué d’une alumine contenant 700 ppm de Na2O. Le catalyseur ici testé est la Sphéralite 505® de la société Axens. La hauteur du lit catalytique est de 15 cm. In a tubular steel catalytic reactor, were introduced 70 ml (49 g) a catalyst consisting of an alumina containing 700 ppm of Na2O. The catalyst tested here is Spheralite 505® from Axens. The height of the catalytic bed is 15 cm.
[0043] On alimente ce réacteur avec 43 g/h de BDO et 31 .1 g/h d’h^SThis reactor is fed with 43 g/h of BDO and 31.1 g/h of h^S
[0044] La pression dans le réacteur est maintenue constante à 3 bars absolus. The pressure in the reactor is kept constant at 3 bars absolute.
[0045] La température moyenne du lit catalytique est de 280°C. The average temperature of the catalytic bed is 280°C.
[0046] Dans ces conditions, on obtient une conversion de 100% du BDO et un rendement molaire en THT de 98%. Under these conditions, a conversion of 100% of the BDO and a molar yield of THT of 98% are obtained.
[0047] On notera par rapport à l’exemple 1 que l’absence de CO2 ne diminue pas les performances de la réaction. It will be noted with respect to Example 1 that the absence of CO2 does not reduce the performance of the reaction.
[0048] Exemple 3 comparatif : Production de THT à partir de BDO et de gaz acide (H2S/CO2) Comparative Example 3: Production of THT from BDO and Acid Gas (H2S/CO2)
[0049] Dans un réacteur catalytique tubulaire en acier, on introduit 70 ml (52 g) d’un catalyseur constitué d’une alumine contenant 4000 ppm de Na2Û. Le catalyseur ici testé est le Alumine A 2-5 de la société Axens. La hauteur du lit catalytique est de 15 cm. In a tubular steel catalytic reactor, 70 ml (52 g) of a catalyst consisting of an alumina containing 4000 ppm of Na2O are introduced. The catalyst tested here is Alumina A 2-5 from Axens. The height of the catalytic bed is 15 cm.
[0050] On alimente ce réacteur avec 43 g/h de BDO, 31 .1 g/h d’H2S et 32.9 g/h de CO2. This reactor is fed with 43 g/h of BDO, 31.1 g/h of H2S and 32.9 g/h of CO2.
[0051] La pression dans le réacteur est maintenue constante à 3 bars absolus. The pressure in the reactor is kept constant at 3 bar absolute.
[0052] La température moyenne du lit catalytique est de 220°C. The average temperature of the catalytic bed is 220°C.
[0053] Dans ces conditions, on obtient une conversion de 100% du BDO, un rendement molaire en THT de 82%. Under these conditions, a conversion of 100% of the BDO is obtained, a molar yield of THT of 82%.
[0054] Cet essai montre que l’utilisation d’une alumine dopée conduit à une diminution du rendement. This test shows that the use of a doped alumina leads to a reduction in yield.
[0055] Exemple 4 selon l’invention : Production de THT à partir de BDO et de H2S pur Example 4 according to the invention: Production of THT from BDO and pure H2S
[0056] Dans un réacteur catalytique tubulaire en acier, on a introduit 70 ml (49 g) d’un catalyseur constitué d’une alumine contenant 700 ppm de Na2Û. Le catalyseur ici testé est la Sphéralite 505® de la société Axens. La hauteur du lit catalytique est de 15 cm. In a tubular steel catalytic reactor, 70 ml (49 g) of a catalyst consisting of an alumina containing 700 ppm of Na2O were introduced. The catalyst tested here is Spheralite 505® from Axens. The height of the catalytic bed is 15 cm.
[0057] On alimente ce réacteur avec 43 g/h de BDO et 31 .1 g/h d’H2SThis reactor is fed with 43 g/h of BDO and 31.1 g/h of H2S
[0058] La pression dans le réacteur est maintenue constante à 3 bars absolus. The pressure in the reactor is kept constant at 3 bars absolute.
[0059] La température moyenne du lit catalytique est de 280°C. The average temperature of the catalytic bed is 280°C.
[0060] Dans ces conditions, on obtient une conversion de 100% du BDO. Under these conditions, a conversion of 100% of the BDO is obtained.
[0061] Ensuite, le flux issu de cette étape de réaction est amené dans un condenseur. Les évents gazeux sont éliminés et le flux condensé riche en tétrahy- drothiophène est décanté. La phase aqueuse est éliminée et la phase organique subit une étape de distillation. Le tétrahydrothiophène est récupéré avec un rendement molaire de 98%.
Then, the flow from this reaction step is fed into a condenser. The gaseous vents are eliminated and the condensed stream rich in tetrahydrothiophene is decanted. The aqueous phase is removed and the organic phase undergoes a distillation step. The tetrahydrothiophene is recovered with a molar yield of 98%.
Claims
1. Procédé de production de tétrahydrothiophène comprenant une étape de réaction de 1 ,4-butanediol ou de tétrahydrofurane, en présence de sulfure d’hydrogène (H2S), et éventuellement de dioxyde de carbone en phase gaz, à une température comprise entre 200 et 320°C, en présence d’alumine en tant que catalyseur comportant une teneur en oxyde de sodium inférieure à 0,3% en poids par rapport au poids total du catalyseur. 1. Process for producing tetrahydrothiophene comprising a step of reacting 1,4-butanediol or tetrahydrofuran, in the presence of hydrogen sulphide (H2S), and optionally carbon dioxide in the gas phase, at a temperature between 200 and 320° C., in the presence of alumina as catalyst comprising a sodium oxide content of less than 0.3% by weight relative to the total weight of the catalyst.
2. Procédé selon la revendication 1 , caractérisé en ce que l’alumine comporte une teneur en oxyde de sodium comprise entre 0% et 0,1 % en poids, de préférence entre 0% et 0,08% et plus particulièrement entre 0,03% et 0,08% en poids par rapport au poids total du catalyseur. 2. Method according to claim 1, characterized in that the alumina has a sodium oxide content of between 0% and 0.1% by weight, preferably between 0% and 0.08% and more particularly between 0, 03% and 0.08% by weight relative to the total weight of the catalyst.
3. Procédé selon la revendication 1 ou 2, caractérisé en ce que la réaction est réalisée à une température comprise entre 220 et 320°C, de préférence entre 220 et 280°C. 3. Process according to claim 1 or 2, characterized in that the reaction is carried out at a temperature of between 220 and 320°C, preferably between 220 and 280°C.
4. Procédé selon l’une quelconque des revendications précédentes, caractérisé en ce que la réaction est réalisée sous une pression comprise entre 1 et 100 bars, de préférence entre 1 et 50 bars. 4. Method according to any one of the preceding claims, characterized in that the reaction is carried out under a pressure of between 1 and 100 bars, preferably between 1 and 50 bars.
5. Procédé selon l’une quelconque des revendications précédentes, caractérisé en ce que le ratio molaire de sulfure d’hydrogène par rapport au 1 ,4-butanediol est compris entre 0,1 et 100, de préférence entre 0,1 et 50, de manière encore préférée entre 0,5 et 10. 5. Method according to any one of the preceding claims, characterized in that the molar ratio of hydrogen sulphide relative to 1,4-butanediol is between 0.1 and 100, preferably between 0.1 and 50, more preferably between 0.5 and 10.
6. Procédé selon l’une quelconque des revendications précédentes, caractérisé en ce que le ratio molaire de sulfure d’hydrogène par rapport au tétrahydrofurane est compris entre 0,1 et 100, de préférence entre 0,1 et 50, de manière encore préférée entre 0,5 et 10. 6. Method according to any one of the preceding claims, characterized in that the molar ratio of hydrogen sulphide relative to tetrahydrofuran is between 0.1 and 100, preferably between 0.1 and 50, even more preferably between 0.5 and 10.
/.Procédé selon l’une quelconque des revendications précédentes, caractérisé en ce que la réaction est réalisée en présence de dioxyde de carbone en phase gaz, à une température comprise entre 220 et 280°C. /.Process according to any one of the preceding claims, characterized in that the reaction is carried out in the presence of carbon dioxide in the gas phase, at a temperature of between 220 and 280°C.
8. Procédé selon l’une quelconque des revendications précédentes, caractérisé en ce que le catalyseur comprend une teneur maximale d’oxydes alcalin et d’oxydes alcalino- terreux inférieure à 0,3% en poids par rapport au poids total du catalyseur. 8. Process according to any one of the preceding claims, characterized in that the catalyst comprises a maximum content of alkaline oxides and alkaline-earth oxides of less than 0.3% by weight relative to the total weight of the catalyst.
9. Procédé selon l’une quelconque des revendications précédentes, caractérisé en ce qu’il comprend les étapes successives suivantes : b) condensation du flux issu à l’étape définie à l’une quelconque des revendications précédentes pour obtenir un flux riche en tétrahydrothiophène et
des évents gazeux contenant les incondensables éventuellement formés à l’issue de l’étape définie à l’une quelconque des revendications précédentes ; c) au moins une étape de purification, de préférence par décantation, du flux riche en tétrahydrothiophène issu de l’étape b) avec séparation de la phase aqueuse, de la phase organique et des évents gazeux ; d) éventuellement au moins une distillation de la phase organique pour isoler le tétrahydrothiophène des évents gazeux ; e) récupération du tétrahydrothiophène isolé à l’étape c) et éventuellement à l’étape d), les étapes b) et c) pouvant être successives ou simultanées.
9. Method according to any one of the preceding claims, characterized in that it comprises the following successive steps: b) condensation of the stream resulting from the step defined in any one of the preceding claims to obtain a stream rich in tetrahydrothiophene And gaseous vents containing the incondensables possibly formed at the end of the step defined in any one of the preceding claims; c) at least one stage of purification, preferably by decantation, of the stream rich in tetrahydrothiophene resulting from stage b) with separation of the aqueous phase, of the organic phase and of the gaseous vents; d) optionally at least one distillation of the organic phase to isolate the tetrahydrothiophene from the gas vents; e) recovery of the tetrahydrothiophene isolated in step c) and optionally in step d), steps b) and c) possibly being successive or simultaneous.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP22835096.3A EP4444706A1 (en) | 2021-12-06 | 2022-12-05 | Method for producing tetrahydrothiophene |
CN202280080367.1A CN118355003A (en) | 2021-12-06 | 2022-12-05 | Process for the preparation of tetrahydrothiophenes |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FRFR2112997 | 2021-12-06 | ||
FR2112997A FR3129941B1 (en) | 2021-12-06 | 2021-12-06 | Process for the production of tetrahydrothiophene |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2023105153A1 true WO2023105153A1 (en) | 2023-06-15 |
Family
ID=80122434
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2022/052248 WO2023105153A1 (en) | 2021-12-06 | 2022-12-05 | Method for producing tetrahydrothiophene |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP4444706A1 (en) |
CN (1) | CN118355003A (en) |
FR (1) | FR3129941B1 (en) |
WO (1) | WO2023105153A1 (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3819651A (en) * | 1969-07-18 | 1974-06-25 | Glanzstoff Ag | Process for the production of tetrahydrothiophene |
-
2021
- 2021-12-06 FR FR2112997A patent/FR3129941B1/en active Active
-
2022
- 2022-12-05 EP EP22835096.3A patent/EP4444706A1/en active Pending
- 2022-12-05 CN CN202280080367.1A patent/CN118355003A/en active Pending
- 2022-12-05 WO PCT/FR2022/052248 patent/WO2023105153A1/en active Application Filing
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3819651A (en) * | 1969-07-18 | 1974-06-25 | Glanzstoff Ag | Process for the production of tetrahydrothiophene |
Non-Patent Citations (1)
Title |
---|
MASHKINA A.V. ET AL: "Catalytic synthesis of thiolane from tetrahydrofuran and H2S", APPLIED CATALYSIS A: GENERAL, vol. 116, no. 1-2, 1 September 1994 (1994-09-01), AMSTERDAM, NL, pages 95 - 108, XP055934351, ISSN: 0926-860X, DOI: 10.1016/0926-860X(94)80282-3 * |
Also Published As
Publication number | Publication date |
---|---|
EP4444706A1 (en) | 2024-10-16 |
CN118355003A (en) | 2024-07-16 |
FR3129941B1 (en) | 2024-10-11 |
FR3129941A1 (en) | 2023-06-09 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
FR2902787A1 (en) | PROCESS FOR PRODUCING 1,2-DICHLOROETHANE | |
CN105793216B (en) | The method for producing butadiene by oxidative dehydrogenation | |
FR2902786A1 (en) | PROCESS FOR PRODUCING 1,2-DICHLOROETHANE | |
EP2349558B1 (en) | Process of catalytic hydrogenation of carbon disulphide to methyl mercaptan | |
EP2670730A1 (en) | Preparation of diamine via the preparation of aminonitrile | |
AU668529B2 (en) | Process for the fluidized bed oxidation of ethane to acetic acid | |
EP0668257B1 (en) | Catalyst and process for the hydrogenation of benzene using the said catalyst | |
EP4444706A1 (en) | Method for producing tetrahydrothiophene | |
CN114364650A (en) | Method for producing 1, 3-butadiene | |
CN214973860U (en) | Process system for synthesizing chloroethylene by mercury-free catalyst | |
JP4401105B2 (en) | Method for producing chlorine and method for producing aromatic polycarbonate | |
EP2621896B1 (en) | Process for preparing dimethyl disulfide | |
EP1165481B1 (en) | Process for the oxidation of cycloalkanes, cycloalcohols and/or cycloketones | |
US10689584B2 (en) | Oxidative desulfurization of liquid fuels using metal sulfide quantum dots/graphen oxid hybrid nanocatalyst | |
EP0679709A1 (en) | Process for the conversion of natural gas into hydrocarbons | |
EP3354327B1 (en) | Monomer recovery | |
CN112871090A (en) | Process system and method for synthesizing chloroethylene by mercury-free catalyst | |
EP4444702A1 (en) | Method for producing tetrahydrothiophene | |
JP2009102260A (en) | Method for producing light olefin | |
JP5060492B2 (en) | Butane absorption system for emission control and ethylene purification | |
EP4359378A1 (en) | Method for preparing mercaptans by sulfhydrolysis of dialkyl sulfides with catalyst pretreatment | |
US20220402837A1 (en) | Method for preparing 1-butene and propylene | |
RU1799865C (en) | Method of methanol production | |
KR20240061949A (en) | Method for preparing 2,2,4,4-tetramethyl cyclobutanedione | |
JP2013126978A (en) | Method for producing propylene oxide |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 22835096 Country of ref document: EP Kind code of ref document: A1 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2022835096 Country of ref document: EP |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
ENP | Entry into the national phase |
Ref document number: 2022835096 Country of ref document: EP Effective date: 20240708 |