US 11,498,887 B2Granted

Process for producing dienes

AssigneeVersalis S.P.A.

InventorsDaniele Delledonne, Alberto Cesana, Marco Mattachini, Monica Vittoria Pastori

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Abstract

The present invention relates to a process for producing a diene, preferably a conjugated diene, more preferably 1,3-butadiene, comprising the dehydration of at least one alkenol having a number of carbon atoms greater than or equal to 4, in the presence of a catalytic material comprising at least one crystalline metalosilicate in acid form, preferably a macroporous zeolite, more preferably a zeolite with a FAU, BEA or MTW structure. Preferably, said alkenol having a number of carbon atoms greater than or equal to 4 may be obbtained directly through biosynthetic processes, or through catalytic dehydration processes of at least one diol. When said alkenol is a butenol, said diol is preferably a butanediol, more preferably 1,3-butanediol, even more preferably bio-1,3-butanediol, i.e. 1,3-butanediol deriving from biosynthetic processes. When said alkenol is 1,3-butanediol, or bio-1,3-butanediol, the diene obtained with the process according to the present invention is, respectively, 1,3-butadiene, or bio-1,3-butadiene.

Claims18

Dependent claims

A process for producing a conjugated diene comprising:

obtaining at least one alkenol selected from the group consisting of commercial alkenols, alkenols obtained from a biosynthetic process, and alkenols obtained by a catalytic dehydration, said at least one alkenol comprising a linear or branched alkenol having the general formula CnH2nO, wherein n is an integer greater than or equal to 4 and less than or equal to 8,
dehydrating said at least one alkenol in the presence of at least one catalytic material comprising at least one macroporous zeolite having an FAU, BEA, or MTW structure and in acid form, or prevalently acid form, to produce a product comprising the conjugated diene,
wherein said at least one macroporous zeolite has a molar ratio of SiO2/Al2O3 between 7 and 60,
wherein said at least one catalytic material comprises at least one inorganic binder selected from the group consisting of silica, alumina, zirconium oxide, titanium oxide and mixtures thereof, in a quantity of 5% to 80% by weight relative to a total weight of said at least one catalytic material,
provided that if said at least one alkenol is derived from catalytic dehydration of at least one diol, said catalytic dehydration of at least one diol is performed under different conditions as a previous dehydration step occurring prior to the dehydrating at least one alkenol.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/339,186Filed 18 Oct 2017
Priority: IT 10201600010517819 Oct 2016
Published: US 2019/0241481 A18 Aug 2019
Granted: 15 Nov 2022
Term ends: Not estimatedThe source records don’t support an estimate.

Classification24 codes

C07C 1/24
Starting from organic compounds containing only oxygen atoms as heteroatoms: by elimination of water
B01J 23/10
Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00: of rare earths
B01J 29/08
Crystalline aluminosilicate zeolites; Isomorphous compounds thereof: of the faujasite type, e.g. type X or Y
B01J 29/084
Of the faujasite type, e.g. type X or Y: y-type faujasite