Economic process for producing xylose from hydrolysate using electrodialysis and direct recovery method

Patent metadata

Field	Value
Publication number	US-9133229-B2
Application number	US-200913503221-A
Country	US
Kind code	B2
Filing date	Oct 30, 2009
Priority date	Oct 30, 2009
Publication date	Sep 15, 2015
Grant date	Sep 15, 2015

Abstract

The present invention relates to an environmentally friendly, simple and economic process for producing xylose. The process comprises the steps of: a) countercurrently extracting tropical fruit biomass by hydrolysis with sulfuric acid to obtain a high-concentration xylose extract; b) adjusting the extract to a pH of 1.5-2.5 and decolorizing and filtering the pH-adjusted extract; c) desalting the filtrate in an electrodialysis device; and d) recycling a waste sulfuric acid solution recovered from step c), to step a), and concentrating and directly recovering the desalted filtrate to obtain xylose crystals.

First claim

The invention claimed is:

1. A process for producing xylose by hydrolyzing tropical fruit biomass with sulfuric acid, the process comprising the steps of:
a) countercurrently extracting tropical fruit biomass by hydrolysis with sulfuric acid to obtain an extract;
b) adjusting the extract to a pH of 1.5-2.5 and decolorizing and filtering the pH-adjusted extract to obtain a filtrate;
c) desalting the filtrate in an electrodialysis device; and
d) recycling a waste sulfuric acid solution recovered from step c), to step a), and concentrating and directly recovering the desalted organic material to obtain xylose crystals, wherein the process does not comprise a step of precipitation, neutralization and ion-exchange.

2. The process of claim 1 , wherein 2,000-4,000 ppm of sulfuric acid is added to the waste sulfuric acid solution recovered from step c) before the recovered waste sulfuric acid solution is recycled to step a).

3. The process of claim 1 , wherein the xylose concentration of the filtrate in step b) is 80% or more.

4. The process of claim 1 , wherein the filtrate in step c) is desalted until the filtrate reaches a conductivity of 1,000 uS/cm or less.

5. The process of claim 1 , wherein the sugar content ratio of the extract in step a) is 60-90% based on the weight of the separated mixed hydrolysates.

Assignees

• Lee Joo-Hang
• An Jun-Gap
• Park Seung-Won
• Kim Taek-Beom
• Kim Seong-Bo
• Lee Dong-Hoon
• Lee Woon-Hwa
• Son Dae-Ho
• Ji Seung-Bae
• Lee Kang-Pyo
• Cj Cheiljedang Corp

Inventors

• Lee Joo-Hang
• An Jun-Gap
• Park Seung-Won
• Kim Taek-Beom
• Kim Seong-Bo
• Lee Dong-Hoon
• Lee Woon-Hwa
• Son Dae-Ho
• Ji Seung-Bae
• Lee Kang-Pyo

Classifications

• C13K13/002

  Xylose · CPC title

• B01D61/422

  Electrodialysis · CPC title

• C07H3/02 Primary

  Monosaccharides · CPC title

• C13B20/165

  using membranes, e.g. osmosis, ultrafiltration (electrodialysis C13B20/18) · CPC title