Method and apparatus for methanol and other fuel production
View Patent ↗A method and apparatus for converting organic waste feed streams into usable liquid fuels by adjusting the ratio of carbon dioxide, carbon monoxide, and hydrogen in the effluent gas of a high temperature waste treatment system. A pressure swing adsorption (PSA) unit is used to remove carbon dioxide from the effluent gas of a high temperature waste treatment system, while leaving carbon monoxide and hydrogen, thereby producing a gas stream amenable to the production of methanol and other liquid fuels using commercially available catalytic reactors.
1. A method for converting an organic waste stream into an organic liquid comprising the steps of:
a. heating the waste in the presence of oxygen and steam to produce a synthesis gas having a stoichiometric number of less than 1,
b. removing a sufficient amount of CO 2 to adjust the stoichiometric number of the synthesis gas to over 1 by introducing a flow of the synthesis gas through a pressure swing adsorber,
c. maintaining the flow of synthesis gas through the pressure swing adsorber until the capacity of the pressure swing adsorber to adsorb additional H 2 and CO is substantially exhausted, and the capacity of the pressure swing adsorber to adsorb additional CO 2 is not substantially exhausted, and
d. exposing the synthesis gas to a catalyst at sufficient heat and pressure to produce an organic liquid.
2. The method of claim 1 further comprising the step of cleaning the synthesis gas to remove at least one contaminant selected from the group particulate, HCl, H 2 S.
3. The method of claim 1 wherein the organic liquid is selected from methanol, ethanol, propanol, butanol, di-methyl ether, Fischer Tropsch liquids, and combinations thereof.
4. The method of claim 1 wherein the synthesis gas is exposed to the catalyst at pressures between about 10 bar and about 100 bar, and temperatures between about 200 and 400 C.
5. The method of claim 1 wherein the synthesis gas in the pressure swing adsorber is at a pressure of from about 5 psia and 200 psia.
6. The method of claim 1 wherein the catalyst is selected as low temperature methanol synthesis catalysts, including but not limited to, copper oxide, zinc oxide, and alumina; dimethyl ether catalysts, dehydration catalysts, metals, metal oxides, and combinations thereof.
7. The method of claim 1 further comprising the step of removing mercury from the synthesis gas.
8. The method of claim 1 further comprising the step of removing organic contaminants from the synthesis gas.
9. The method of claim 1 further comprising the step of removing organic contaminants from the synthesis gas in the pressure swing adsorber.