Method of obtaining an organic salt or acid from an aqueous sugar stream
First Claim
1. A process for obtaining one or more than one organic salt or organic acid from an aqueous sugar stream comprising one or more than one mineral acid, one or more than one organic acid, and a sugar selected from the group consisting of xylose, glucose, arabinose, galactose, mannose and a combination thereof, said process comprising:
- (i) introducing the aqueous sugar stream to a first anion exchange unit comprising one or more than one bed comprising an anion exchange resin, wherein the mineral acid, an anion of the mineral acid, or a combination thereof, binds to the resin;
(ii) producing an effluent stream comprising the sugar and the organic acid from the first anion exchange unit and regenerating the anion exchange resin with one or more regenerants, thereby producing one or more outlet streams comprising the mineral acid, a salt of the mineral acid or a combination thereof;
(iii) feeding the effluent stream comprising the sugar and the organic acid to a second anion exchange unit comprising one or more than one bed comprising an anion exchange resin, wherein the organic acid or an anion of the organic acid binds to the resin;
(iv) obtaining a stream from the second anion exchange unit comprising the sugar, which stream is substantially free of the mineral acid and the organic acid and regenerating the second anion exchange unit with one or more regenerants, thereby producing one or more product streams comprising a salt of the organic acid, the organic acid or a combination thereof; and
(v) recovering the one or more product streams, wherein the organic acid is selected from the group consisting of acetic acid, formic acid, glucuronic acid, galacturonic acid and a combination thereof and the mineral acid is selected from the group consisting of sulfuric acid, hydrochloric acid, sulfurous acid, phosphoric acid and a combination thereof.
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Accused Products
Abstract
A process for obtaining one or more than one salt of an organic acid(s), or organic acid(s), from an aqueous sugar stream comprising one or more than one mineral acid and the organic acid(s) is provided. The process comprises introducing the aqueous sugar stream to a separation system comprising one or more beds of anion exchange resin and obtaining a stream therefrom comprising the sugar. The one or more beds of anion exchange resin are then regenerated in one or more stages to produce at least one product stream comprising the organic acid, a salt of the organic acid, or a combination thereof, and a separate outlet stream comprising the mineral acid, a salt of the mineral acid, or a combination thereof. The product stream is then recovered. The separation may be conducted with two separation units, or using a single anion exchange unit.
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Citations
47 Claims
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1. A process for obtaining one or more than one organic salt or organic acid from an aqueous sugar stream comprising one or more than one mineral acid, one or more than one organic acid, and a sugar selected from the group consisting of xylose, glucose, arabinose, galactose, mannose and a combination thereof, said process comprising:
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(i) introducing the aqueous sugar stream to a first anion exchange unit comprising one or more than one bed comprising an anion exchange resin, wherein the mineral acid, an anion of the mineral acid, or a combination thereof, binds to the resin; (ii) producing an effluent stream comprising the sugar and the organic acid from the first anion exchange unit and regenerating the anion exchange resin with one or more regenerants, thereby producing one or more outlet streams comprising the mineral acid, a salt of the mineral acid or a combination thereof; (iii) feeding the effluent stream comprising the sugar and the organic acid to a second anion exchange unit comprising one or more than one bed comprising an anion exchange resin, wherein the organic acid or an anion of the organic acid binds to the resin; (iv) obtaining a stream from the second anion exchange unit comprising the sugar, which stream is substantially free of the mineral acid and the organic acid and regenerating the second anion exchange unit with one or more regenerants, thereby producing one or more product streams comprising a salt of the organic acid, the organic acid or a combination thereof; and (v) recovering the one or more product streams, wherein the organic acid is selected from the group consisting of acetic acid, formic acid, glucuronic acid, galacturonic acid and a combination thereof and the mineral acid is selected from the group consisting of sulfuric acid, hydrochloric acid, sulfurous acid, phosphoric acid and a combination thereof. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A process for obtaining an organic salt or organic acid from an aqueous sugar stream comprising a mineral acid, an organic acid, and a sugar selected from the group consisting of xylose, glucose, arabinose, galactose, mannose and a combination thereof, said process comprising the steps of:
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(i) introducing the aqueous sugar stream to a separation system comprising one or more beds of anion exchange resin and obtaining at least one stream therefrom comprising the sugar; (ii) regenerating the one or more beds of anion exchange resin in one or more stages, thereby producing at least one stream comprising the mineral acid, a salt of the mineral acid, or a combination thereof, and at least one separate product stream comprising the organic acid, a salt of the organic acid, or a combination thereof; and (iii) recovering the at least one product stream, wherein the organic acid is selected from the group consisting of acetic acid, formic acid, glucuronic acid, galacturonic acid and a combination thereof and the mineral acid is selected from the group consisting of sulfuric acid, hydrochloric acid, sulfurous acid, phosphoric acid and a combination thereof, wherein steps (i) and (ii) are carried out by anion exchange. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44)
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45. A process for obtaining acetate salt, acetic acid or a combination thereof, from a lignocellulosic feedstock, comprising the steps of:
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(i) obtaining an aqueous sugar stream resulting from hydrolysis of the lignocellulosic feedstock, said hydrolysis comprising one or more stages of sulfuric acid addition, said sugar stream comprising acetic acid, acetate salt, or a combination thereof, sulfuric acid and one or more sugars selected from xylose, glucose, arabinose, galactose, mannose and a combination thereof; (ii) introducing the aqueous sugar stream to a Simulated Moving Bed separation system comprising one or more beds of anion exchange resin and obtaining at least one stream therefrom comprising the one or more sugars; (iii) regenerating the one or more beds of anion exchange resin with sulfuric acid, thereby producing at least one organic acid product stream comprising the acetic acid and, thereafter, regenerating the one or more beds of anion exchange resin with ammonium hydroxide to produce at least one separate outlet stream comprising ammonium sulfate; and (iv) recovering the at least one product stream. - View Dependent Claims (46, 47)
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Specification