Method for making aldehydes, alcohols, amides, and carboxylic acids from plastic pyrolysis oil
A method to make primary alcohols, carboxylic acids, amines, and other value-added chemicals from plastic waste. The method includes the steps of pyrolyzing plastic waste to yield pyrolysis oil; hydroformylating the pyrolysis oil in the absence of any added co-reactants to yield a mixture comprising aldehydes; and hydrogenating, oxidizing, aminating, or aldolizing the mixture to yield a product comprising primary alcohols, carboxylic acids, amines, or larger (>C10) chemicals with carbonyl function groups.
1. A method to make primary alcohols, di-alcohols, or esters from plastic waste, the method comprising:
(a) providing pyrolysis oil and separating the pyrolysis oil into a light cut having a boiling point less than about 175° C. and a heavy cut having a boiling point greater than about 175° C., where the light cut and the heavy cut comprise olefins, wherein the light cut consists essentially of compounds having less than 11 carbon atoms, and the heavy cut consists essentially of compounds having more than 10 carbon atoms; and then
(b) hydroformylating the light cut and/or the heavy cut, independently, at a pressure between about 50 atm and about 70 atm and at a temperature between about 100° C. and 120° C., wherein at least a portion of the olefins in the light cut and/or the heavy cut are converted to aldehydes, to yield corresponding light and/or heavy mixtures comprising aldehydes;
(c) separately hydrogenating the light mixture and/or the heavy mixture of step (b) to yield corresponding product mixture(s) comprising a product selected from the group consisting of primary alcohols, di-alcohols, esters, and combinations thereof.
2. The method of claim 1 , wherein step (a) comprises providing pyrolysis oil from plastic waste comprising a poly(alkylene).
3. The method of claim 1 , wherein step (a) comprises providing pyrolysis oil from plastic waste comprising poly(ethylene).
4. The method of claim 1 , wherein step (b) comprises contacting the pyrolysis oil with syngas and a transition metal-containing catalyst.
5. The method of claim 4 , wherein the transition metal-containing catalyst comprises cobalt or rhodium.
6. The method of claim 4 , wherein the transition metal-containing catalyst comprises HCo(CO) 4 , Co 2 (CO) 8 , a triphenylphosphine-modified cobalt-containing catalyst, a triphenylphosphine-modified rhodium-containing catalyst, a cobalt-containing salt of triphenylphosphinetrisulfonate, or a rhodium-containing salt of triphenylphosphinetrisulfonate.
7. The method of claim 4 , wherein step (c) comprises contacting the mixture of step (b) with hydrogen and a transition metal-containing catalyst, for a time, at a temperature, and at a pressure of hydrogen wherein at least a portion of aldehydes contained in the mixture of step (b) are converted into alcohols.
8. The method of claim 4 , wherein when step (c) is performed on the light cut, the product mixture comprises products having from 5 to 13 carbon atoms, and when step (c) is performed on the heavy cut, the product mixture comprises products having from 10 to 30 carbon atoms.