Method for preparing ethanol by using raw material containing cellulose

A technology for cellulose and raw materials, applied in the field of ethanol preparation, can solve the problems of low ethanol yield, lower ethanol yield, lower cellulose ratio, etc., and achieve the effects of increasing sugar conversion rate, increasing yield, and increasing production efficiency

Active Publication Date: 2009-09-09
COFCO GROUP
View PDF2 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] The purpose of the present invention is to overcome the defects of the low yield of ethanol in the existing method for preparing ethanol from cellulose-containing raw materials, and provide a method for preparing ethanol using cellulose-containing raw materials with higher ethanol yield
The presumed reason may be that due to the large amount of cellulose-containing raw materials put into the steam explosion device in each batch, and the difference in the accumulation mode of each batch of raw materials or the instability of steam explosion conditions, it is impossible to ensure that all the cellulose-containing raw materials The cellulose raw material fully absorbs the water vapor within a few minutes after being steamed, so there are still most of the cellulose-containing raw materials that cannot be completely exploded by the water vapor inside because they cannot fully absorb the water vapor. As a result, the lignin sheath embedding cellulose and hemicellulose in the cellulose-containing raw material cannot be fully destroyed, reducing the proportion of cellulose in the cellulose-containing raw material that can be contacted with enzymes, thereby reducing the yield of ethanol

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
  • Method for preparing ethanol by using raw material containing cellulose
  • Method for preparing ethanol by using raw material containing cellulose
  • Method for preparing ethanol by using raw material containing cellulose

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] This example is used to illustrate the method of the present invention for producing ethanol from cellulose-containing raw materials.

[0066] (1) Continuous steam explosion

[0067] test as figure 1 For the corn stalk raw material shown, the water content of the corn stalk measured by the above-mentioned method is 20% by weight, the raw material is cut into small sections of 1.5 cm × 0.2 cm × 0.5 cm, and the corn stalk section with a water content of 20% by weight is It is fed continuously from the feeder, and water drenched before being transported to the heat preservation pressure device, and the water drench makes the water content of the corn stalks 40% by weight. Then 2000 grams of corn stalks with a water content of 40% by weight are continuously transported to the heat preservation pressure device, the pressure of the heat preservation pressure device is 1.6 MPa, and the temperature is 195 ° C. Transmission, the linear speed of transmission enables the corn st...

Embodiment 2

[0078] This example is used to illustrate the method of the present invention for producing ethanol from cellulose-containing raw materials.

[0079] Prepare ethanol according to the method of Example 1, the difference is that the corn stalk section with a water content of 20% by weight is continuously fed from the feeder, and water drenched before being transported to the heat preservation pressure device, the water drench makes The moisture content of the corn stover segment was 75% by weight. Then according to the conditions and methods of Example 1, 2000 grams of corn stalks with a moisture content of 75% by weight are continuously delivered to the heat preservation pressure device for continuous steam explosion, and the steam explosion waste is collected and washed to obtain a total of 3000 grams of solid steam explosion waste ( The water content was 83.3% by weight).

[0080] According to the method for the steam explosion product of hydrolysis of sulfuric acid hydrolys...

Embodiment 3

[0083] This example illustrates the process of the present invention for producing ethanol from cellulose-containing feedstocks.

[0084] Ethanol was prepared according to the method of Example 1, the difference was that 2000 grams of corn stalks with a water content of 20% by weight were continuously sent from the feeder without water showering and directly transported to the heat preservation pressure device for continuous steaming Explosion, the condition of steam explosion is the same as embodiment 1, obtains 3556 grams of solid steam explosion waste (water content is 55% by weight) altogether after collecting steam explosion waste and washing.

[0085] According to the method for the steam explosion product of hydrolysis of sulfuric acid hydrolysis by HPLC described in Example 1, record 3556 grams of steam explosion product containing 680 grams of cellulose and 193.8 grams of hemicellulose.

[0086] According to the method of Example 1, the steam explosion product was enz...

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

No PUM Login to view more

Abstract

The invention discloses a method for preparing ethanol by using a raw material containing cellulose, which comprises the steps of subjecting the raw material containing cellulose to steam explosion, mixing an obtained product of the steam explosion with an enzyme for enzymolysis, and fermenting the obtained enzymatic product, wherein a method for the steam explosion of the raw material containing cellulose comprises the steps of continuously delivering the raw material containing cellulose to a heat-preservation pressure unit, keeping the raw material containing cellulose in the heat-preservation pressure unit for 3 to 10 minutes and then releasing part of the raw material containing cellulose in the heat-preservation pressure unit to normal pressure every other 5 to 12 seconds; and a method for mixing the product of the steam explosion and the enzyme comprises the step of mixing the product of the steam explosion with the enzyme in batches, wherein the batches are at least two batches, and in each batch, the additive amount of the product of the steam explosion accounts for 60 percent of the total weight of the product of explosion at most. The method of the invention can effectively improve the sugar conversion rate of the raw material, thereby greatly improving ethanol yield.

Description

technical field [0001] The present invention relates to a process for the production of ethanol, and more particularly to a process for producing ethanol from cellulose-containing raw materials. Background technique [0002] The prior art method for producing ethanol from cellulose-containing raw materials, such as straw, mainly includes three steps: 1. pretreatment of cellulose-containing raw materials, 2. enzymatic hydrolysis of cellulose; 3. fermentation of sugar to produce ethanol. [0003] Cellulose-containing raw materials are generally roots, stems and leaves of plants, including straw. The stalks are the roots, stems and leaves left after harvesting fruits of crops (generally herbaceous plants), mainly stems and leaves, such as corn stalks, sorghum stalks, wheat straws and other cereal plant stalks. The main component of straw is lignocellulose. The lignocellulose is a mixture of cellulose, hemicellulose and lignin, and the cellulose, hemicellulose and lignin are c...

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): C12P7/06C12R1/84C12R1/865
CPCY02E50/17Y02E50/10
Inventor 岳国君刘甲申李春玲王国忠林海龙于天杨
Owner COFCO GROUP
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