Integrated methods of preparing renewable chemicals
View Patent ↗Isobutene, isoprene, and butadiene are obtained from mixtures of C 4 and/or C 5 olefins by dehydrogenation. The C 4 and/or C 5 olefins can be obtained by dehydration of C 4 and C 5 alcohols, for example, renewable C 4 and C 5 alcohols prepared from biomass by thermochemical or fermentation processes. Isoprene or butadiene can be polymerized to form polymers such as polyisoprene, polybutadiene, synthetic rubbers such as butyl rubber, etc. in addition, butadiene can be converted to monomers such as methyl methacrylate, adipic acid, adiponitrile, 1,4-butadiene, etc. which can then be polymerized to form nylons, polyesters, polymethylmethacrylate etc.
1. An integrated process for preparing renewable hydrocarbons, comprising:
(a) providing renewable isobutanol and renewable ethanol;
(b) dehydrating the renewable isobutanol, thereby forming a renewable butene mixture comprising one or more renewable linear butenes and renewable isobutene;
(c) dehydrating the renewable ethanol, thereby forming renewable ethylene;
(d) reacting at least a portion of the renewable butene mixture and at least a portion of the renewable ethylene to form one or more renewable C 3 -C 16 olefins;
(e) forming renewable hydrogen by one or more of:
(e1) isolating and dehydrogenating at least a portion of the linear butenes formed in step (b) and/or one or more renewable C 4 -C 16 olefins formed in step (d) thereby forming one or more renewable C 4 -C 16 dienes and renewable hydrogen;
(e2) isolating and dehydrocyclizing at least a portion of one or more renewable C 6 -C 16 olefins formed in step (d), thereby forming one or more renewable C 6 -C 16 aromatics and renewable hydrogen;
(e3) isolating and dehydrocyclizing at least a portion of one or more renewable C 6 -C 16 dienes formed in step (e1) to form one or more renewable C 6 -C 16 aromatics and renewable hydrogen; and
(f) hydrogenating at least a portion of the renewable C 3 -C 16 olefins with the renewable hydrogen formed in step (e), thereby forming a renewable saturated hydrocarbon fuel or fuel additive, wherein the amount of said dehydrogenating and/or dehydrocyclizing in step (e), and/or the amount of hydrogenating in step (f) are controlled so that the amount of renewable hydrogen formed in step (e) is essentially completely consumed in step (f).
2. The integrated process of claim 1 , wherein the one or more renewable linear butenes comprise 2-butene.
3. The integrated process of claim 1 , wherein said reacting of step (d) comprises one or more reactions selected from the group consisting of disproportionation, metathesis, oligomerization, isomerization, alkylation, dehydrodimerization, dehydrocyclization, and combinations thereof.
4. The integrated process of claim 1 , wherein said reacting of step (d) comprises dimerizing at least a portion of the renewable isobutene, thereby forming a renewable isobutene dimer mixture comprising at least one C 8 hydrocarbon selected from the group consisting of a 2,4,4-trimethylpentene, a 2,5-dimethylhexene, and 2,5-dimethylhexadienes, and combinations thereof.
5. The integrated process of claim 1 , wherein said reacting of step (d) comprises trimerizing at least a portion of the renewable isobutene, thereby forming a renewable isobutene trimer mixture comprising 2,2,4,6,6-pentamethylheptene.
6. The integrated process of claim 1 , wherein said reacting of step (d) comprises tetramerizing at least a portion of the renewable isobutene, thereby forming a renewable isobutene tetramer mixture, wherein the renewable isobutene tetramer mixture comprises 2,2,4,6,6,8,8-heptamethylnonene.
7. The integrated process of claim 1 , wherein said reacting of step (d) comprises isomerizing at least a portion of the renewable isobutene of step (b) to form an isobutene isomerization mixture comprising renewable 2-butene, wherein said reacting of step (d) further comprises disproportionating at least a portion of the renewable ethylene formed in step (c) and at least a portion of the renewable 2-butene formed by isomerizing at least a portion of the renewable isobutene of step (b), thereby forming renewable propylene.
8. The integrated process of claim 2 , wherein said reacting of step (d) comprises disproportionating at least a portion of the renewable ethylene formed in step (c) and at least a portion of the renewable 2-butene formed in step (b), thereby forming renewable propylene.
9. The integrated process of claim 2 , wherein said reacting of step (d) comprises disproportionating at least a portion of the renewable ethylene formed in step (c), and at least a portion of the renewable 2-butene formed in step (b) and renewable 2-butene formed by isomerizing the renewable isobutene formed in step (b), thereby forming renewable propylene.
10. The integrated process of claim 1 , wherein step (e) comprises step (e1).
11. The integrated process of claim 10 , wherein the one or more renewable C 4 -C 16 dienes formed in step (e1) comprise butadiene.
12. The integrated process of claim 1 , wherein step (e) comprises step (e2).
13. The integrated process of claim 12 , wherein the one or more renewable C 6 -C 16 aromatics formed in step (e2) comprise renewable p-xylene.
14. The integrated process of claim 1 , wherein step (e) comprises step (e1) and step (e2).
15. The integrated process of claim 1 , wherein step (e) comprises step (e1) and step (e3).
16. The integrated process of claim 1 , wherein step (e) comprises step (e1), step (e2), and step (e3).
17. The integrated process of claim 4 , wherein at least a portion of the renewable isobutene dimer mixture is hydrogenated in step (f), whereby the renewable saturated hydrocarbon fuel or fuel additive comprises isooctane, wherein the renewable isobutene dimer mixture is hydrogenated in step (f), whereby the renewable saturated hydrocarbon fuel or fuel additive comprises isooctane.
18. The integrated process of claim 5 , wherein at least a portion of the renewable isobutene trimer mixture is hydrogenated in step (f), whereby the renewable saturated hydrocarbon fuel or fuel additive comprises one or more pentamethylheptanes, wherein the renewable isobutene trimer mixture is hydrogenated in step (f), whereby the renewable saturated hydrocarbon fuel or fuel additive comprises one or more pentamethylheptanes.
19. The integrated process of claim 1 , wherein said reacting of step (d) further comprises mixing said renewable butene mixture and/or said renewable ethylene with at least a portion of a non-renewable butene and/or a butene mixture and/or non-renewable renewable ethylene to form one or more C 3 -C 16 olefins, and at least a portion of said one or more C 3 -C 16 olefins are renewable.