Method for preparing high-additional-value chemicals by different pH acid-alkali pretreatment of biomass and one-step cracking

A high value-added, biomass technology, applied in the preparation of sugar derivatives, chemical instruments and methods, preparation of carboxylate, etc., can solve the problem of unreported research on the distribution of thermal cracking products, and achieve simple operation, energy saving, The effect of improving economic efficiency

Inactive Publication Date: 2016-08-31
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, studies on the distribution of pyrolysis products with different acid and base pretreatments have not been reported

Method used

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  • Method for preparing high-additional-value chemicals by different pH acid-alkali pretreatment of biomass and one-step cracking
  • Method for preparing high-additional-value chemicals by different pH acid-alkali pretreatment of biomass and one-step cracking
  • Method for preparing high-additional-value chemicals by different pH acid-alkali pretreatment of biomass and one-step cracking

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Configured with sulfuric acid pHA pretreatment solution of 1 was used in this experiment, and the corncob powder was treated with the pretreatment solution in a continuous stirred tank reactor, that is, 3 g of corncobs and 30 ml of pretreatment solution were added to the reactor, and then in 30 min Internally heated to 373K, kept at 600rpm for 3 hours, the rotary evaporator was used to evaporate the water in the pretreatment liquid, the remaining corncobs were transferred to a 20cm glass dish, vacuum dried at 333K for 48h to obtain the product, and the above corncobs were weighed and 0.6 g HZSM-5 molecular sieve, after fully stirring evenly, pack on the quartz sand in the middle part of the reaction tube (diameter = 25 mm, length = 400 mm), feed 40ml / min of nitrogen for air tightness inspection, after passing, Continue to ventilate for 3 minutes to remove the internal air. Then, raise the temperature at a rate of 50°C / min. When the temperature rises to 500°C, stay for 1...

Embodiment 2

[0039] Configured with sulfuric acid pH The pretreatment liquid of 2 was used in this experiment, and the corncob powder was treated with the pretreatment liquid in the continuous stirred tank reactor, that is, 3g of corncobs and 30ml of the pretreatment liquid were added to the reactor, and then in 30min Internally heated to 373K, kept at 600rpm for 3 hours, the rotary evaporator was used to evaporate the water in the pretreatment liquid, the remaining corncobs were transferred to a 20cm glass dish, vacuum dried at 333K for 48h to obtain the product, and the above corncobs were weighed and 0.6 g HZSM-5 molecular sieve, after fully stirring evenly, pack on the quartz sand in the middle part of the reaction tube (diameter = 25 mm, length = 400 mm), feed 40ml / min of nitrogen for air tightness inspection, after passing, Continue to ventilate for 3 minutes to remove the internal air. Then, raise the temperature at a rate of 50°C / min. When the temperature rises to 500°C, stay for 1...

Embodiment 3

[0041] Configured with sulfuric acid pH The pretreatment solution of 3 was used in this experiment, the corn cob powder was treated with the pretreatment solution in the continuous stirred tank reactor, that is, 3g of corn cob and 30ml of the pretreatment solution were added to the reactor, and then the 30min Internally heated to 373K, kept at 600rpm for 3 hours, the rotary evaporator was used to evaporate the water in the pretreatment liquid, the remaining corncobs were transferred to a 20cm glass dish, vacuum dried at 333K for 48h to obtain the product, and the above corncobs were weighed and 0.6 g HZSM-5 molecular sieve, after fully stirring evenly, pack on the quartz sand in the middle part of the reaction tube (diameter = 25 mm, length = 400 mm), feed 40ml / min of nitrogen for air tightness inspection, after passing, Continue to ventilate for 3 minutes to remove the internal air. Then, raise the temperature at a rate of 50°C / min. When the temperature rises to 500°C, stay f...

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Abstract

The invention relates to a method for preparing high-additional-value chemicals by different pH acid-alkali pretreatment of biomass and one-step cracking. The method comprises the following steps: pulverizing the biomass into powder; pretreating the powder by using different pH acid-alkali treatment solutions; after pretreating, carrying out rotary evaporation and vacuum drying to obtain the treated biomass powder; loading the treated biomass powder and an HZSM-5 molecular sieve in a reaction tube; and carrying out thermal cracking reaction in the nitrogen atmosphere at the heating speed of 50-80 DEG C / min to obtain the chemicals. The method is easy to operate and low in requirements of equipment; and the used biomass is agricultural wastes such as sugar cane bagasse and corn cobs, the high-additional-value chemicals such as 2,3-dihydrobenzofuran, 4-ethyl-guaiacol, levoglucosenone, 1-hydroxyl-2-butanone and 1,2-cyclopentanedione are produced by the agricultural wastes, in the aspect of raw materials, the agricultural wastes are cycled, environmental pollution is reduced, and the method has high economic value and social value and has important significance.

Description

technical field [0001] The invention belongs to the technical field of chemical preparation, and in particular relates to a method for preparing high value-added chemicals by one-step pyrolysis of biomass with different pH acid-base pretreatment. Background technique [0002] Due to the excessive use of fossil energy, it is imminent to develop new energy to replace fossil energy. Due to its carbon-neutral, inedible, abundant and sustainable characteristics, biomass energy is one of the most promising energy sources for the clean production of chemicals and fuels. [0003] Pyrolysis is one of the most popular and commonly used methods for biomass conversion due to the simplicity and convenience of serial production operations. Since the first experiments in the 1970s, rapid lysis production liquids have developed rapidly. In the presence of high-temperature air, the raw materials vaporize rapidly and condense into a dark brown liquid. While traditional pyrolysis processes ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07H3/10C07H1/00C07D307/50C07D307/79C07C53/08C07C51/00C07C43/23C07C41/00C07C49/395C07C45/51C07C15/04C07C1/00C07C31/04C07C29/00C07C49/17
CPCC07C1/00C07C29/00C07C41/00C07C45/51C07C51/00C07D307/50C07D307/79C07H1/00C07H3/10C07C53/08C07C43/23C07C49/395C07C15/04C07C31/04C07C49/17
Inventor 王建国柏家奇庄桂林高义粉
Owner ZHEJIANG UNIV OF TECH
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