| abstract |
In a feedstock conversion process comprising carbohydrates, the process involves contacting the feedstock with alcohol in the first step at temperatures below 100 ° C. in the first step to produce an intermediate product, and in the second step Contacting at least a portion of the intermediate product with alcohol at a second acid catalyst condition at a temperature of at least 100 ° C. The conversion product includes hydroxymethylfurfural, hydroxymethylfurfural ethers, levulinic acid, esters thereof and furfural. do. |