Method for preparing furfural and co-producing lignin and cellulosic ethanol via plant material

A technology for plant materials and cellulosic ethanol, which is applied in the field of preparing furfural from plant materials and co-producing lignin and cellulosic ethanol, can solve the problems of harming the ecological environment, waste of raw materials, etc., and achieves high acid utilization rate, reduced consumption, and small sewage discharge. Effect

Active Publication Date: 2013-07-10
SHANDONG LONGLIVE BIO TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Not only seriously endanger the ecological environment, but also cause waste of raw materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Embodiment 1 prepares furfural with corn stalks as raw material

[0037] Proceed as follows:

[0038] (1) Preparation of pentose sugars by hydrolysis of hemicellulose: mix corn stalks and sulfuric acid (mass concentration of sulfuric acid is 1.5%) at a mass ratio of 1:14, heat up, and keep warm at 120°C for 1.5 hours to hydrolyze the hemicelluloses. After hydrolysis, a box-type filter press is used to separate the slag liquid to obtain sugar slag for the preparation of lignin and cellulose ethanol; the obtained pentose sugar liquid is dehydrated and cyclized to prepare furfural.

[0039] (2) Sugar liquid preheating: After separation, the pentose sugar liquid passes through a plate heat exchanger to exchange heat with aldehyde vapor, and the temperature rises to 102°C, which is called preheating liquid, and is ready to be sprayed to heat up.

[0040] (3) Heating by spraying: The preheated liquid and steam are sprayed and heated to 159°C through the high-pressure injecto...

Embodiment 2

[0047] Example 2 Preparation of furfural and co-production of lignin and cellulosic ethanol with corn cob as raw material

[0048] Proceed as follows:

[0049] (1) Preparation of pentose sugars by hydrolysis of hemicellulose: corncobs, sulfuric acid and acetic acid solution (the mass ratio of sulfuric acid and acetic acid is 1:1, and the total acid concentration in acid water is 1.0%), mix according to 1:7, and heat up , heat preservation at 110°C for 2 hours to hydrolyze the hemifibers, and use a filter press to separate the slag liquid after hydrolysis to obtain sugar residues for the preparation of lignin and cellulose ethanol; obtain pentose sugar liquids for dehydration and cyclization to prepare furfural .

[0050] (2) Sugar liquid preheating: After separation, the pentose sugar liquid passes through a plate heat exchanger to exchange heat with aldehyde vapor, and the temperature rises to 99°C, which is called preheating liquid, and is ready to be sprayed to heat up.

...

Embodiment 3

[0059] Embodiment 3 prepares furfural with wheat straw as raw material

[0060] Proceed as follows:

[0061] (1) Preparation of pentose sugars by hydrolysis of hemicellulose: Wheat straw and sulfuric acid water (mass concentration of sulfuric acid is 1.8%) are mixed at a ratio of 1:15, heated up, and kept at 115°C for 1.5 hours to hydrolyze the hemicellulose. After hydrolysis A centrifuge is used to separate the slag liquid to obtain sugar slag for the preparation of lignin and cellulose ethanol; the obtained pentose liquid is dehydrated and cyclized to prepare furfural.

[0062] (2) Sugar liquid preheating: After separation, the pentose sugar liquid passes through a plate heat exchanger to exchange heat with aldehyde vapor, and the temperature rises to 108°C, which is called preheating liquid, and is ready to be sprayed to heat up.

[0063] (3) Heating by spraying: The preheated liquid and steam are sprayed and heated to 170°C through the high-pressure injector, and then ent...

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Abstract

The invention discloses a method for preparing furfural and co-producing lignin and cellulosic ethanol via a plant material. The method disclosed by the invention comprises the following steps of: (1) hydrolyzing hemicelluloses to prepare pentose; (2) preheating a pentose solution; (3) ejecting and heating; (4) dewatering and cyclizing; (5) flash-evaporating aldehyde steam to release pressure; (6) distilling; (7) rectifying in a manner of rectifying under vacuum and controlling the temperature at 98-120 DEG C to obtain a main fraction furfural; and (8) eluting lignin in pentose slag acquired in the step (1) by using an alkali liquor, acquiring delignification slag and a lignin solution, neutralizing the lignin solution to acquire the lignin, and carrying out enzymolysis on the delignification slag via cellulase to prepare the cellulosic ethanol. The method disclosed by the invention can be used for realizing cyclic utilization and comprehensive utilization of the plant materials, improving the utilization rate of raw materials, reducing the consumption of auxiliary materials and reducing the emission of wastes and reducing environmental protection pressure; and the method disclosed by the invention is a clean production and preparation process.

Description

technical field [0001] The invention relates to a two-step method for preparing furfural and co-producing lignin and cellulosic ethanol using plant materials (plant stalks, corn cobs, bark, bamboo and other bio-based materials) as raw materials. Background technique [0002] Furfural is an important organic chemical raw material and chemical solvent widely used in petroleum industry, chemical industry, medicine, food, synthetic rubber, synthetic resin and other industries. Furfural, also known as furan formaldehyde, is a colorless and transparent liquid at room temperature, and has a bitter almond smell, and the industrial product is slightly pale yellow. It is easy to turn black in the air. The molecular weight is 96.09, the specific gravity is 1.16, and the melting point is -36.67°C. The boiling point is 161.67°C, the relative density is 1.1596 (20°C), the ignition point is 393°C, and the critical pressure is 5.5MPa. [0003] At present, there are sulfuric acid method, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D307/48C12P7/10C12P19/14C08H7/00
CPCY02E50/10
Inventor 陈小刚覃树林袁伟岗王吉垒肖林
Owner SHANDONG LONGLIVE BIO TECH CO LTD
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