Circular economy methods of preparing unsaturated compounds
AssigneeInternational Flavors & Fragrances Inc.
InventorsSunitha Rao TADEPALLI, Geatesh Karunakaran TAMPY, Anubhav P.S. NARULA
Life of this patent
Estimating the term…
Abstract
Methods of preparing unsaturated compounds or analogs through dehydrogenation of corresponding saturated compounds and/or hydrogenation of aromatic compounds are disclosed.
Claims20
A method of preparing an unsaturated compound, comprising dehydrogenation of a corresponding saturated compound in the presence of a catalyst system under conditions that effect loss of one or more molecules of hydrogen (H2) per molecule of the saturated compound.
A method of preparing a compound of formula I(a) or I(b), comprising selective hydrogenation of a compound of formula III in the presence of a catalyst:
- wherein Q is CH2, CH2CH2, CH(CH3), or C(CH3)2.
A process of preparing 1,1,2,3,3-Pentamethyl-4,5,6,7-tetrahydro-1H-indene (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 by-product, 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 flow reactor having a second catalyst;
- (e) dehydrogenating HHPMI to PMI in the second flow reactor to obtain a dehydrogenation stream;
- (f) feeding the dehydrogenation stream into the first flow 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 flow reactor;
- and
- (i) collecting the product stream containing THPMI.
Dependencies are inferred from the claim text.