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Methods for detoxifying a lignocellulosic hydrolysate

A technology for lignocellulose and hydrolyzate, which is applied in the field of detoxification of lignocellulose hydrolyzate, and can solve problems such as raising maintenance cost and pipeline blockage.

Inactive Publication Date: 2014-12-31
BP CORP NORTH AMERICA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Gypsum formation causes scaling and line blockage, which significantly increases maintenance costs

Method used

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  • Methods for detoxifying a lignocellulosic hydrolysate
  • Methods for detoxifying a lignocellulosic hydrolysate
  • Methods for detoxifying a lignocellulosic hydrolysate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0090] Example 1: Hydrolysis of Lignocellulosic Biomass (Section 5.1)

[0091] Lignocellulosic biomass (such as energy cane or sugarcane) is harvested and cut to size using a feed chopper, inoculated with a Lactobacillus bacterial preparation and stored in agricultural bags until use. Prior to dilute acid hydrolysis, lignocellulosic biomass was removed from the bags and washed with process water to remove organic acids, then dehydrated using a screw press. The biomass is then sent to a pressurized reaction chamber (ie hydrolyzer) along with water and sulfuric acid (0.2% to 3%). The liquid / solid ratio of the slurry is minimized to maximize the concentration of dissolved sugars in the hydrolyzate after hydrolysis. The residence time in the hydrolyzer and the temperature of the hydrolyzer depend on the parameters of the biomass (such as humidity and dextran level). Generally, the temperature of the hydrolyzer is in the range of 120°C to 180°C, and the residence time is in the r...

Embodiment 2

[0096] Example 2: Two-step detoxification of sugarcane hydrolyzate using magnesium hydroxide and ammonium hydroxide - batch process (Section 5.2)

[0097] Materials and methods (Section 5.2.1)

[0098] Sugarcane DP 110105 (section 5.2.1.1)

[0099] The hydrolyzate DP 110105 obtained from sugar cane was placed in a 1 L reactor vessel suitable for overhead stirring, heated to 47°C by means of a heating mantle and mixed vigorously. While the hydrolyzate solution was warming, the target amount of magnesium hydroxide slurry (ie supersaturated solution of magnesium hydroxide in water) was weighed. The total amount of magnesium hydroxide added to the hydrolyzate was determined from the titration of the hydrolyzate solution with sodium hydroxide. See Martinez et al., 2001, Biotechnol. Prog. 17(2):287-293. A magnesium hydroxide slurry was added to the hydrolyzate solution at a dose of 15.73 g / Kg hydrolyzate at 47°C while the solution was vigorously mixed and held for 5 minutes. Aft...

Embodiment 3

[0111]Example 3: Two-step batch detoxification procedure of sugarcane hydrolyzate DP 110505 with magnesium hydroxide and ammonium hydroxide - effect of pH (Section 5.3)

[0112] Materials and methods (Section 5.3.1)

[0113] Detoxification from sugarcane DP110105 was performed using a two-step batch detoxification process using magnesium hydroxide and ammonium hydroxide in a manner similar to that described in Section 5.2.1.2. Experiments were performed to measure the effect of pH on selectivity (furfural elimination versus xylose degradation) at various time points after ammonium hydroxide.

[0114] Yellow hydrolyzate DP 110105 (800 g) was placed in a 1 L unbaffled reactor vessel suitable for overhead stirring, heated to 47°C by a heating mantle and stirred at 420 rpm. After heating the hydrolyzate solution to the desired temperature, a slurry of magnesium hydroxide was added rapidly to the hydrolyzate solution at 47°C to pH 5.8 while stirring and held for 5 minutes. Ammoni...

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Abstract

The present disclosure relates to methods for detoxifying a hydrolysate obtained from a lignocellulosic biomass and methods of producing ethanol from the detoxified hydrolysate. The present methods provide detoxified hydrolysates in which the quantity of compounds that are deleterious to fermenting microorganisms are substantially reduced relative to the starting hydrolysate and in which the amount of total fermentable sugars loss is minimal.

Description

Background technique [0001] Many industrial products are produced by microorganisms grown in culture. Microbial growth can be supported by soluble sugar molecules released from lignocellulosic biomass. Lignocellulosic biomass is mainly composed of cellulose (a polymer of glucose linked by β-1,4-glycosidic bonds), hemicellulose (a polymer of five-carbon (C5 ) sugars and polysaccharides composed of six-carbon (C6) sugars) and lignin (a complex polymer composed of phenylpropane units linked by ether bonds or carbon-carbon bonds). In some cases, lignocellulosic biomass is subjected to dilute acid hydrolysis, during which hemicellulose is hydrolyzed into monomeric sugars (liquid stream) and the crystalline structure of the cellulose is disrupted for future enzymatic digestion (solid fiber). A liquid containing C5 and C6 sugars, the so-called hydrolyzate, is separated from the cellulose and lignin solids and can be fermented into various products such as ethanol. However, in add...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P19/00
CPCC12P19/00Y02E50/10C12P7/10
Inventor 马乌戈热塔·斯卢普斯卡佐藤裕纪子卡伦·库斯特佐黄永宁
Owner BP CORP NORTH AMERICA INC
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