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1. (WO2017003294) PROCÉDÉ DE PRÉPARATION D'UN DÉRIVÉ DE FURFURAL COMPRENANT LA NEUTRALISATION D'UN MÉLANGE RÉACTIONNEL ACIDE
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CLAIMS

1. Process for the preparation of a furfural derivative having the chemical formula (1)


wherein R represents hydrogen, an alkyl group or an acyl group, which process comprises

reacting a fructose- and/or glucose-containing starting material with a liquid hydroxyl group-containing compound of formula R-OH in the presence of an acid catalyst at a reaction temperature in the range of 150 to 300 °C to produce a primary acid reaction mixture comprising the furfural derivative of chemical formula (1);

separating at least part of the liquid hydroxyl group-containing compound from the primary acid reaction mixture to yield a secondary acid reaction mixture;

neutralizing the secondary acid reaction mixture to a pH-value of at least 3 to obtain a neutralized reaction mixture; and

purifying the neutralized reaction mixture to recover the furfural derivative of chemical formula (1).

2. Process according to claim 1 , wherein R represents an alkyl group.

3. Process according to claim 1 or 2, wherein the liquid hydroxyl group-containing compound is water or methanol or a mixture thereof.

4. Process according to any one of claims 1 to 3, wherein the acid catalyst is a Br0nsted acid selected from the group consisting of mineral inorganic acids, organic acids and mixtures thereof.

5. Process according to any one of claims 1 to 4, wherein the secondary acid reaction mixture has a pH of smaller than 2.

6. Process according to any one of claims 1 to 5, wherein the secondary acid reaction mixture is neutralized by the addition of an alkali metal or alkaline earth metal hydroxide or alkoxide.

7. Process according to any one of claims 1 to 6, wherein the neutralized reaction mixture is subjected to separation of at least part of the liquid hydroxyl group-containing compound from the neutralized reaction mixture to yield a product mixture; and to recovery of the furfural derivative with the chemical formula (1) from the product mixture.

8. Process according to claim 7, wherein the neutralized reaction mixture is subjected to evaporation to yield the product mixture.

9. Process according to any one of claims 1 to 8, wherein the furfural derivative with the chemical formula (1) is recovered by evaporation or distillation to yield the furfural derivative with the chemical formula (1) and a bottom residue comprising acid catalyst.

10. Process according to claim 9, wherein the bottom residue is washed with an aqueous liquid.

1 1. Process according to any one of claims 1 to 10, wherein the secondary acid reaction mixture is neutralized at a temperature in the range of 25 to 150 °C and a pressure of 0.1 to 40 bar.