Assertion: lignin's group | /r/MadeOf | oxalic acid
Facets:
Source sentences:
text: The general method of resol resin production also contemplates several specific versions such as, for example, versions specifically adopted for wood adhesive production wherein: (1) the aldehyde source is capable of producing formaldehyde, such as, for example, an aldehyde selected from the group consisting of formaldehyde, paraformaldehyde, hexamethylenetetramine, and also other aldehydes such as acetaldehyde, and furfural; (2) the demethylated lignin dissolved in the demethylated lignin-containing alkaline aqueous solution is demethylated kraft lignin; (3) the polar, partially water immiscible organic solvent is selected from the group consisting of esters such as ethyl acetate (which is preferred), propyl acetate, butyl acetate and amyl acetate and ketones such as 2-butanone (which is preferred), 2-pentanone, 3-pentanone, 2-hexanone and 3-hexanone; (4) the demethylated lignin-containing aqueous solution is acidified to a pH of from about 5 to about 2; (5) the demethylated lignin-containing aqueous solution/organic solvent mixture is acidified to a pH of about 3 by use of a mineral acid selected from the group consisting of sulfuric acid, hydrochloric acid, phosphoric acid and/or an organic carboxylic acids such as oxalic acid, formic acid acetic acid and lactic acid;
text: The general method of resol resin production also contemplates several specific versions such as, for example, versions specifically adopted for wood adhesive production wherein: (1) the aldehyde source is capable of producing formaldehyde, such as, for example, an aldehyde selected from the group consisting of formaldehyde, paraformaldehyde, hexamethylenetetramine, and also other aldehydes such as acetaldehyde, and furfural; (2) the demethylated lignin dissolved in the demethylated lignin-containing alkaline aqueous solution is demethylated kraft lignin; (3) the polar, partially water immiscible organic solvent is selected from the group consisting of esters such as ethyl acetate (which is preferred), propyl acetate, butyl acetate and amyl acetate and ketones such as 2-butanone (which is preferred), 2-pentanone, 3-pentanone, 2-hexanone and 3-hexanone; (4) the demethylated lignin-containing aqueous solution is acidified to a pH of from about 5 to about 2; (5) the demethylated lignin-containing aqueous solution/organic solvent mixture is acidified to a pH of about 3 by use of a mineral acid selected from the group consisting of sulfuric acid, hydrochloric acid, phosphoric acid and/or an organic carboxylic acids such as oxalic acid, formic acid acetic acid and lactic acid;