Back to results
US 10,329,230 B2Granted
Process for the separation and purification of a mixed diol stream
AssigneeEastman Chemical Company
InventorScott Donald Barnicki
Life of this patent
Estimating the term…
Abstract
Disclosed is a process for the purification of a mixed diol stream. The mixed diol stream comprising two-, three-, and four-carbon diols is separated into component diols by extraction with a hydrophobic solvent mixture. The diols recovered in the extractant may be removed from the extractant stream by back extraction with water or by distillation with an azeotrope-forming agent present, preferably an azeotroping agent already present in the extractant mixture.
Claims9
A process for recovering diols from a mixed diol stream, comprising
- (A) extracting said mixed diol stream, comprising
- (i) 0.1 weight percent to 50 weight percent of one or more diols selected from the group consisting of ethylene glycol, 1,2-propanediol, 1,3-propanediol, 1,2-butanediol, 1,3-butanediol, 1,4-butanediol, and 2,3-butanediol;
- (ii) 5 weight percent to 90 weight percent glycerol;
- and
- (iii) 5 weight percent to 90 weight percent water;
- each based on the total weight of said mixed diol steam stream, with an extractant, comprising
- (i) a hydrophobic solvent selected from alkanols having from 6 to 20 carbon atoms, ketones having from 5 to 20 carbon atoms, esters having from 5 to 20 carbon atoms, ethers having from 5 to 20 carbon atoms, carboxylic acids having from 5 to 20 carbon atoms, trialkylphosphine oxides having from 18 to 48 carbon atoms, and mixtures thereof;
- and
- (ii) optionally, a second modifying hydrophobic solvent selected from hydrocarbons having from 5 to 20 carbon atoms;
- to form a raffinate phase comprising a major amount of said glycerol and a minor amount of said diols contained in said mixed diol stream and an extract phase comprising a major amount of said diols and a minor amount of said glycerol contained in said mixed diol stream;
- and
- (B) separating said raffinate phase and said extract phase.
9 more elements
A process for recovering diols from a mixed diol stream, comprising
- (A) extracting said mixed diol stream, comprising
- (i) 0.1 weight percent to 30 weight percent of one or more diols selected from the group consisting of ethylene glycol, 1,2-propanediol, 1,3-propanediol, 1,2-butanediol, 1,3-butanediol, 1,4-butanediol, and 2,3-butanediol;
- (ii) 5 weight percent to 50 weight percent glucose;
- and
- (iii) 50 weight percent to 90 weight percent water;
- each based on the total weight of said mixed diol steam stream, with an extractant, comprising
- (i) a hydrophobic solvent selected from alkanols having from 6 to 20 carbon atoms, ketones having from 5 to 20 carbon atoms, esters having from 5 to 20 carbon atoms, ethers having from 5 to 20 carbon atoms, carboxylic acids having from 5 to 20 carbon atoms, trialkylphosphine oxides having from 18 to 48 carbon atoms, and mixtures thereof;
- and
- (ii) optionally, a second modifying hydrophobic solvent selected from hydrocarbons having from 5 to 20 carbon atoms;
- to form a raffinate phase comprising a major amount of said glycerol and a minor amount of said diols contained in said mixed diol stream and an extract phase comprising a major amount of said diols and a minor amount of said glycerol contained in said mixed diol stream;
- and
- (B) separating said raffinate phase and said extract phase.
9 more elements
A process for recovering purified three-carbon diols from a mixed diol stream, comprising
- (A) extracting said mixed diol stream, comprising
- (i) 1 weight percent to 99.5 weight of one or more three-carbon diols selected from 1,2-propanediol and 1,3-propanediol;
- (ii) 20 ppm by weight to 99 weight percent of one or more four-carbon diols selected from 1,2-butanediol, 1,3-butanediol, 1,4-butanediol, and 2,3-butanediol;
- each based on the total weight of said diols, and
- (iii) 0 weight percent to 50 weight percent water, based on the total weight of said diols and said water, with an extractant, comprising
- (i) a hydrophobic solvent selected from alkanols having from 6 to 20 carbon atoms, ketones having from 5 to 20 carbon atoms, esters having from 5 to 20 carbon atoms, ethers having from 5 to 20 carbon atoms, carboxylic acids having from 5 to 20 carbon atoms, trialkylphosphine oxides having from 18 to 48 carbon atoms, and mixtures thereof;
- and
- (ii) optionally, a second modifying hydrophobic solvent selected from hydrocarbons having from 5 to 20 carbon atoms;
- to form a raffinate phase comprising a major amount of said three-carbon diols and a minor amount of said four-carbon diols contained in said mixed diol stream and an extract phase comprising a major amount of said four-carbon diols and a minor amount of said three-carbon diols contained in said mixed diol stream;
- and
- (B) separating said raffinate phase and said extract phase.
8 more elements
Dependencies are inferred from the claim text.