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Systems and methods for acid recycle

A technology of acid solution and biomass, applied in the field of acid recovery systems and methods, capable of solving problems such as excess minerals

Inactive Publication Date: 2014-06-04
POET RES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Neutralization also comes with significant costs and can cause excess minerals that can accumulate in downstream systems

Method used

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  • Systems and methods for acid recycle
  • Systems and methods for acid recycle
  • Systems and methods for acid recycle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0065] In an exemplary embodiment of the system, a limited series of examples were performed in an attempt to evaluate the effect of various recycling volumes and processing conditions. Experiments and tests were performed to evaluate the relationship of xylose concentration, glucose yield, acetic acid concentration and inhibitor levels (such as furfural) to recovery volume, number of cycles and processing conditions. The following experiments are intended to illustrate some examples of systems and modes of operation and are not intended to limit the scope of the aspects disclosed herein.

[0066]

[0067] Table 5 provides a summary of the experimental conditions of the examples, including pretreatment temperature, number of cycles, sulfuric acid concentration, and timing. For all examples, sugar, furfural / 5-hydroxy-methylfurfural (HMF), and acetic acid levels were measured using known HPLC (high performance liquid chromatography) analytical techniques. After the saccharific...

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Abstract

Methods and systems for pretreating lignocellulosic biomass are disclosed. An acid solution between 1% to 1.6% sulfuric acid is applied to the biomass. The biomass is subjected to an elevated temperature to cause the production of xylose, glucose, and furfural. Adjustments to temperature, acid concentration, and time can generate at least 80% or 90% of theoretical xylose, 45% or 50% of the theoretical glucose, and less than 4000 ppm of furfural in the xylose liquor. A portion of the resulting xylose liquor may be separated from the glucan solids. The xylose liquor, still highly acidic, can be recycled to reduce subsequent acid loading requirements. Makeup acid solution is added to the xylose liquor and subsequent biomass to ensure a proper solids to liquids ratio. The biomass is again treated to higher temperatures to yield sugars. The process may be repeated for each subsequent cycle.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of US Provisional Application Serial No. 61 / 505,389, filed July 7, 2011, entitled "SYSTEMS AND METHODS FOR ACID RECYCLE," which is hereby incorporated by reference in its entirety. technical field [0003] The present invention relates to a system and method for recovering acids from xylose solutions for the production of ethanol from cellulosic feedstocks. The present invention also relates to systems and methods for pretreating biomass prior to providing it to a hydrolysis system and subsequently to a fermentation system to facilitate efficient ethanol production. Background technique [0004] Grains (e.g., corn, sorghum / milo, barley, wheat, soybeans, etc.), sugars (e.g., sugarcane, sugar beet, etc.), and biomass (e.g., cellulosic materials such as switchgrass, corn cobs, and straw) can be used , wood or other plant material) to produce ethanol. [0005] Biomass includes plant ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C13B10/14
CPCC12P2203/00C13K13/007C12P2201/00Y02E50/16C13K1/02C13K13/002Y02E50/10
Inventor 威廉·F.·麦克唐纳夏伦·斯科特·厄本贾森·L.·马丁
Owner POET RES INC
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