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US 10,435,345 B2Granted
Circular economy methods of preparing unsaturated compounds
AssigneeInternational Flavors & Fragrances Inc.
InventorsSunitha Rao Tadepalli, Geatesh Karunakaran Tampy, Anubhav P. S. Narula
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Abstract
Methods of preparing unsaturated compounds or analogs through dehydrogenation of corresponding saturated compounds and/or hydrogenation of aromatic compounds are disclosed.
Claims3
A process of preparing 1,1,2,3,3-Pentamethyl-4,5,6,7-tetrahydro-1H-indane (THPMI) comprising the steps of:
- (a) feeding 1,1,2,3,3-pentamethylindane (PMI) into a first reactor having a first catalyst;
- (b) hydrogenating PMI in the first reactor to obtain a hydrogenation mixture containing THPMI as the desired product, 1,1,2,3,3-pentamethyloctahydro-1H-indene (HHPMI) as a byproduct, and optionally unreacted PMI;
- (c) separating HHPMI from the hydrogenation mixture in a first separation column to obtain a first side stream containing HHPMI and a main stream containing THPMI and PMI;
- (d) passing the first side stream into a second reactor having a second catalyst;
- (e) dehydrogenating HHPMI to PMI in the second reactor to obtain a dehydrogenation stream;
- (f) feeding the dehydrogenation stream into the first reactor;
- (g) separating THPMI in the main stream from PMI in a second separation column to obtain a second side stream containing PMI and a product stream containing THPMI;
- (h) feeding the second side stream into the first reactor;
- and
- (i) collecting the product stream containing THPMI.
7 more elements
Dependencies are inferred from the claim text.