Method for preparing methyl mercaptan
AssigneeArkema France
InventorsGeorges Fremy, Patrice Barre, Jean-Michel Raymond
Life of this patent
Estimating the term…
Abstract
The present invention relates to a method for preparing methyl mercaptan, in batches or continuously, preferably continuously, said method including at least the following steps: a) reacting at least one hydrocarbon feedstock in the presence of hydrogen sulphide (H2S) and optionally sulphur (S) such as to form carbon disulphide (CS2) and hydrogen (H2); b) reacting said carbon disulphide (CS2) by hydrogenation in the presence of said hydrogen (H2) obtained in step a) such as to form methyl mercaptan (CH3SH), hydrogen sulphide (H2S) and possibly hydrogen (H2); c) optionally recirculating said hydrogen sulphide (H2S) formed during step b) to step a); and d) recovering the methyl mercaptan.
Claims21
A process for preparing methyl mercaptan, batchwise or continuously, said process comprising at least the following steps:
- a) reacting at least one hydrocarbon charge in the presence of hydrogen sulphide (H2S) to form carbon disulphide (CS2) and hydrogen (H2), wherein the molar H2S/hydrocarbon charge ratio is between 0.5 and 10, endpoints included,
- b) carrying out a hydrogenation reaction of said carbon disulphide (CS2) in the presence of said hydrogen (H2), both obtained in step a), to form methyl mercaptan (CH3SH), hydrogen sulphide (H2S) and optionally hydrogen (H2),
- c) optionally, recycling said hydrogen sulphide (H2S) formed in step b) to step a), and
- d) recovering the methyl mercaptan.
Dependencies are inferred from the claim text.