Dimethyl disulphide is a light yellow liquid with a very characteristic smell and an extremely low odour threshold at 8 to 10 ppb. DMDS is an. In order to boost its ranking in the DMDS (dimethyl disulfide) global market and meet demand from its customers, Arkema (Paris:AKE) has. Dimethyl disulfide (DMDS) is an organic chemical compound with the molecular formula than the former. This pesticide is marketed as “Paladin” by Arkema.
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Markets Oil and gas. The results are collated in Table 1 below:. Health and working environment. Fuel desulfurization, the final step in refining, employs a process called hydrotreating.
Thiophene and Arkems are blended with combustible hydrocarbon fuel gas to impart a gassy odor to the fuel gas. These processes evidently combine the drawbacks described for reactions 1 and 2 with the additional difficulty of necessitating a supplementary source of hydrogen dmdw order to perform reaction 4.
The process according to claim 1, wherein the hydrocarbon charge is a hydrocarbon charge in gaseous, liquid or solid form and comprises at least one hydrocarbon having a hydrocarbon chain in saturated or unsaturated linear, branched or cyclic form. Accordingly, and in accordance with one dmdd, the process according to the invention comprises not only the recycling of the hydrogen sulphide but also the recycling of the residual compounds, in other unreacted compounds, these being carbon disulphide, optionally hydrogen, optionally the hydrocarbon charge, optionally sulphur, and optionally impurities.
Lightweight materials and design. Share capital and voting rights. Generally speaking, step a may be carried out under a pressure of between 50 mbar and bar i.
The sources of arlema charges are preferably selected from natural gas, shale gas and biogas. Home efficiency and insulation. Select the topic you are interested in: According to another preferred embodiment, the process according to the invention comprises a step e in which the hydrogen sulphide in step d is recycled into step a. Carbon nanotubes and copolymers. Expansion in high growth regions. This embodiment has the advantage of also recycling the initial hydrocarbon charge, thereby allowing a substantial improvement in the DMDS production yield in relation to the hydrocarbon charge introduced at the start.
The entirety of these compounds may be recycled into step a.
Select the topic you are interested in: Air conditioning and refrigeration. According to another embodiment, steps ab and d are carried out in succession in the same reactor. Lethal dose or concentration LDLC:.
More preferably, the hydrocarbon filler comprises at least one alkane, preferably at least methane CH 4ethane, propane or butane, and very preferably methane. One use of particular interest for the xrkema formed during the process of the invention is its use with liquid sulphur to form hydrogen sulphide, which may therefore be used in the process of the invention, as already indicated above.
METHOD FOR PREPARING DIMETHYL DISULPHIDE – ARKEMA FRANCE
Are you searching for technical information? In one preferred embodiment, a catalyst is used for the hydrogenation of the carbon disulphide to methyl mercaptan. The reason for this is that during the implementation of step bthe hydrogen H 2 and the carbon disulphide CS 2 that are obtained in step a react together directly to form hydrogen sulphide H 2 S and methyl mercaptan CH 3 SHand optionally hydrogen H 2.
Dmcs process according to the invention is an autonomous system which advantageously allows the recycling of the residual compounds to step 1for example H 2 S.
The process according to the invention dmd a process of three consecutive reaction steps steps ab and d abovewithout any need for the intermediates obtained in each step to be purified. In the present description, unless otherwise stated, the percentages referred to are percentages by weight. Innovation and sustainable solutions. The amount of catalyst used in step a and the amount of catalyst used in step b are dependent on the amount of methyl mercaptan it is desired to obtain.
Step fthe step of arkmea dimethyl sulphide, may be carried out according to any method known per se, and, for example, by degassing of the more volatile compounds, such as hydrogen and hydrogen sulphide. According to one embodiment, step arkena is implemented in the absence of sulphur, corresponding to the process of the invention in accordance with scheme a.
DMDS for oil refining and petrochemical industries
Arkema Group at a glance. Dimethyl disulfide is a widespread natural odoriferous compound emitted from many sources such as bacteria, fungi, plants and animals. Vision of HR VP. Share capital and voting rights. According to another embodiment, step a is carried out in the absence of catalyst. The methane used as initial hydrocarbon charge may be employed with one or more other gases, different from the hydrocarbon charges as described above, although for obvious reasons of subsequent purification, and ease of implementation of the process risk of accumulation with any recycling operationspreference will be given to using only mixtures of hydrocarbon charges or pure methane.
DMDS Evolution® sulfiding agent
The catalyst used in step a is preferably a supported catalyst, the support being selected preferably from alumina, silica, zeolites, activated carbons, titanium oxide, zirconium oxides, clays, hydrotalcite, hydroxyapatite, magnesia, and others.
It has been observed, moreover, that when coke is formed during the implementation of the process according to the invention, it reacts with the hydrogen sulphide and optionally the sulphur present to form hydrogen and carbon disulphide.
It is a flammable liquid with an unpleasant, garlic -like odor.