Nuclear chemistry

Maleic anhydride

Maleic acid

Fractionation

Geology

Atmospheric pressure

Oceanography

Polymer

Organic chemistry

Copolymer

Chemistry

Lignin

Green Chemistry

Maleic acid for wood fractionation at atmospheric pressure to result in carboxylated lignin with minimal condensation, light color, and to facilitate processing of fractionated solids. 2D <sup>1</sup>H–<sup>13</sup>C HQSC and HMBC analyses confirmed lignin esterification.

Maleic acid as a dicarboxylic acid hydrotrope for sustainable fractionation of wood at atmospheric pressure and ≤100 °C: mode and utility of lignin esterification