The present invention relates to a method for producing vanillin, including the steps of: (A) distilling a solution containing crude vanillin and an aliphatic dicarboxylic acid dialkyl ester to obtain a vanillin solution; and (B) subjecting the vanillin solution to anti-solvent crystallization. The method for producing vanillin according to the present invention enables production of high-purity vanillin with industrially sufficient efficiency without use of a special apparatus.

The present invention relates to a method for producing vanillin, including the steps of: (A) distilling a solution containing crude vanillin and an aliphatic dicarboxylic acid dialkyl ester to obtain a vanillin solution; and (B) subjecting the vanillin solution to anti-solvent crystallization. The method for producing vanillin according to the present invention enables production of high-purity vanillin with industrially sufficient efficiency without use of a special apparatus.

Provided is a small-size, inexpensive gas detection material capable of detecting aldehyde-based gas. The gas detection material includes: a porous body having pores; an alkaline compound carried inside the pores; and a gas sensing agent carried inside the pores.

Provided is a small-size, inexpensive gas detection material capable of detecting aldehyde-based gas. The gas detection material includes: a porous body having pores; an alkaline compound carried inside the pores; and a gas sensing agent carried inside the pores.

The present invention provides for a method to produce a deep eutectic solvent (DES) comprising: (a) providing one or more lignin derived monomeric phenol, or a mixture thereof, in a solution, (b) introducing one or more hydrogen acceptors, or a mixture thereof, to the solution, and (c) heating the solution, such that steps (b) and (c) together result in the synthesis of a DES.

A process for preparing an aromatic compound or compounds where at least one mandelic group CHOHCOOH is described, comprising a reaction for condensation of at least one aromatic compound with glyoxylic acid or derivatives thereof, wherein said condensation reaction is carried out substantially in the absence of any acid or any base added to the reaction medium. The condensation reaction is followed by an oxidation reaction in order to obtain aromatic aldehyde.

A process for preparing an aromatic compound or compounds where at least one mandelic group CHOHCOOH is described, comprising a reaction for condensation of at least one aromatic compound with glyoxylic acid or derivatives thereof, wherein said condensation reaction is carried out substantially in the absence of any acid or any base added to the reaction medium. The condensation reaction is followed by an oxidation reaction in order to obtain aromatic aldehyde.

A method efficiently produces hydroxycinnamic acids having a high quality, from a cellulose-containing biomass. More specifically, the method includes the steps of: obtaining an alkaline filtrate by allowing an alkaline aqueous medium to pass through a cellulose-containing biomass; obtaining a hydroxycinnamic acid extraction liquid by allowing the alkaline filtrate to repeatedly pass through the cellulose-containing biomass; and separating the hydroxycinnamic acid from the hydroxycinnamic acid extraction liquid.

A method efficiently produces hydroxycinnamic acids having a high quality, from a cellulose-containing biomass. More specifically, the method includes the steps of: obtaining an alkaline filtrate by allowing an alkaline aqueous medium to pass through a cellulose-containing biomass; obtaining a hydroxycinnamic acid extraction liquid by allowing the alkaline filtrate to repeatedly pass through the cellulose-containing biomass; and separating the hydroxycinnamic acid from the hydroxycinnamic acid extraction liquid.

The present invention relates to a method for the purification of natural vanillin, comprising a step involving the stripping of a liquid flow F2 containing natural vanillin. The invention also relates to the natural vanillin that can be obtained using the method of the invention, as well as a device for purifying natural vanillin.