Clean production method for preparing xylitol by using agricultural and forestry waste

A technology of agricultural and forestry waste and xylitol, applied in the direction of microorganism-based methods, biochemical equipment and methods, microorganisms, etc., can solve problems such as high energy consumption, high pollution, and low recovery rate

Active Publication Date: 2010-12-01
BEIJING UNIV OF CHEM TECH
View PDF1 Cites 12 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method can efficiently utilize agricultural and forestry waste such as corncobs or cottonseed hulls to produce xylitol, and can also effectively solve the problems of high pollution, high energy consumption, and low recovery rate in the existing industrial production of xylitol

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Clean production method for preparing xylitol by using agricultural and forestry waste
  • Clean production method for preparing xylitol by using agricultural and forestry waste
  • Clean production method for preparing xylitol by using agricultural and forestry waste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Corn cob pretreatment process

[0057] After crushing, dedusting, and water washing pretreatment, the corncob particles weighed 10Kg after being air-dried, added 50L of sulfuric acid solution with a mass fraction of 0.2%, soaked in a water bath at 50°C for 24 hours, and could be left standing or stirred appropriately to make the pigment Dissolution, particle swelling; plate filter to collect dilute acid solution for reuse, filter to obtain corn cob solids, wash the corn cob with a certain amount of deionized water, wash off the attached acid solution, and adjust the surface and internal ions of the corn cob strength.

[0058] Preparation of hydrolyzate by high temperature cooking

[0059] The granular corncobs (dry weight 6Kg) that have been pretreated and soaked in dilute acid are added to a high-temperature reactor, 75L of tap water is added, sealed and heated at high pressure, the temperature is set at 165°C, and the temperature is kept at a stirring speed of 60-150...

Embodiment 2

[0082] Example 2. Preparation of xylitol by fermentation in a cooking liquid fermenter

[0083] The seed liquor cultivated in the seed tank of Example 1 is pumped into the fermenter, the inoculation amount is 10% (volume fraction), and the temperature in the fermenter is maintained at 30°C; potassium dihydrogen phosphate-dipotassium hydrogen phosphate buffer salt is added The pH of the fermentation broth in the tank is controlled at 6.0; the ventilation rate adopts the three-step method of dissolved oxygen regulation method: the dissolved oxygen level in the fermentation tank is controlled in three ways of ventilation rate in different periods during the whole fermentation process. Adjust the ventilation in the tank to 1.1vv in the early stage of fermentation -1 m -1 , the rotation speed is 250rpm, when the wet weight of the bacteria reaches 25g / L, that is, when the fermentation time is 16h, adjust the ventilation in the tank to 0.6vv -1 m -1 , the rotation speed is 210rpm,...

Embodiment 3

[0085] Embodiment 3. Shake flask multi-batch fermentation prepares xylitol

[0086] According to the fermentation results of a single batch in Example 1, the yeast after the fermentation was reverted to produce xylitol by continuous fermentation. The method adopted for batch fermentation can adopt the following two methods: one is to put the empty triangular flask and the fresh medium to be batched into the ultra-clean bench, and sterilize it for 15 minutes by ultraviolet light. The shake flask completed for the first time is left to stand for about 15 minutes, so that the bacteria naturally settle to the bottom of the bottle, and then perform aseptic operation in the ultra-clean bench, pour out about 75% of the supernatant of the fermentation broth that the previous batch of fermentation has completed, and then pour it into The same volume of fresh culture medium is used for the next batch of fermentation. Pay attention to be careful during the pouring process, and do not sha...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
boiling pointaaaaaaaaaa
Login to view more

Abstract

The invention discloses a clean production method for preparing xylitol by using agricultural and forestry waste. The method comprises the following steps of: performing crushing, dust removal and washing pretreatment on an agricultural and forestry waste raw material; soaking the obtained agricultural and forestry waste granules; performing high-temperature digestion treatment on the treated agricultural and forestry waste granules; performing neutralization or over-neutralization treatment on the treated system; performing solid-liquid separation on the treated system, and performing decolorization and detoxification treatment on the obtained liquid components by using active carbon or ion exchange resin; concentrating the treated liquid components to obtain high-concentration digestion liquid for xylitol fermentation; screening and breading high-yield strains for producing the xylitol by substrate fermentation; and producing the xylitol by fermentation. The method is a novel clean process for producing the xylitol, has simple process and easy operation, and is favorable for purification and quality control of a product.

Description

technical field [0001] The invention relates to a clean production method for preparing xylitol from agricultural and forestry wastes, in particular to a method for fermenting and producing xylitol from hemicellulose hydrolyzate of agricultural and forestry wastes such as corn cobs by using a new high-temperature cooking process. Background technique [0002] The molecular formula of xylitol is C 5 h 12 o 5 , molecular weight 152.15. It is easily soluble in water, with a solubility of 1.6kg / L, slightly soluble in ethanol and methanol, with a melting point of 92-96°C and high thermal stability, and a boiling point of 216°C under normal pressure. The finished product of xylitol is white crystal or crystalline powder, sweet in taste, and the sweetness is equivalent to that of sucrose. 1 gram of xylitol is completely metabolized to produce 4.06 calories, which is equivalent to glucose. The heat of solution is -145.6 J / g, so it produces a pleasant cooling sensation in the mo...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): C12P7/18C12N1/20C12R1/74
Inventor 袁其朋王乐王文雅范晓光朱新涛
Owner BEIJING UNIV OF CHEM TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap