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A method for preparing guaiacol products by steam-assisted fixed-bed pyrolysis of lignin

A technology for pyrolyzing lignin and guaiacol, which is applied in the field of steam-assisted fixed-bed pyrolysis of lignin to prepare guaiacol products, which can solve the problem of unstable product selectivity, harsh reaction conditions, and waste of phenolic components. resources and other issues, to achieve the effect of flexible equipment technology, good economy, simple process and improved safety

Active Publication Date: 2022-05-06
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved: in the process of lignin pyrolysis, how to achieve the problem of unstable phenolic components and product selectivity, so as to realize the directional and stable conversion of pyrolysis products; and how to solve the problem of harsh reaction conditions and waste of resources

Method used

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  • A method for preparing guaiacol products by steam-assisted fixed-bed pyrolysis of lignin
  • A method for preparing guaiacol products by steam-assisted fixed-bed pyrolysis of lignin
  • A method for preparing guaiacol products by steam-assisted fixed-bed pyrolysis of lignin

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Experimental program
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Effect test

Embodiment 1

[0032] Add deionized water in the steam generator, close the kettle lid tightly and heat up to 250°C. Weigh 50g of pine alkali lignin and add it into the fixed bed reactor, close the kettle lid tightly and raise the temperature to 325°C. Open the outlet valve of the steam generating device, pass the saturated steam through the fixed bed reactor from bottom to top, and adjust the steam flow rate to 3g / min. After reacting for 2 hours, the steam was condensed, collected and weighed, and the aqueous phase of guaiacol products was obtained after condensation. The yield of guaiacol products was 4.36wt%, and the relative content was 87.69%.

Embodiment 2

[0034] Add deionized water in the steam generator, close the kettle lid tightly and heat up to 250°C. Weigh 50g of pine alkali lignin and add it into the fixed bed reactor, close the kettle lid tightly and raise the temperature to 325°C. Open the outlet valve of the steam generating device, pass the saturated steam through the fixed-bed reactor from bottom to top, and adjust the steam flow rate to 6g / min. After reacting for 2 hours, the steam was condensed, collected and weighed, and the aqueous phase of guaiacol products was obtained after condensation. According to calculation, the yield of guaiacol products is 6.02wt%, and the relative content is 84.79%. The guaiacol products were analyzed by GC-MS total ion chromatogram, and the analysis results were as follows: figure 1 As shown, the relative content results of GC-MS components are shown in Table 1. Depend on figure 1 It can be seen from Table 1 that the components of the water phase product are all phenolic compounds...

Embodiment 3

[0039] Add deionized water in the steam generator, close the kettle lid tightly and heat up to 250°C. Weigh 50g of pine alkali lignin and add it into the fixed bed reactor, close the kettle lid tightly and raise the temperature to 325°C. Open the outlet valve of the steam generating device, pass the saturated steam through the fixed bed reactor from bottom to top, and adjust the steam flow rate to 9g / min. After reacting for 2 hours, the steam was condensed, collected and weighed, and the aqueous phase of guaiacol products was obtained after condensation. The yield of guaiacol products was 8.22wt%, and the relative content was 90.41%.

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Abstract

The invention discloses a method for preparing guaiacol products by pyrolyzing lignin in a steam-assisted fixed bed, and belongs to the technical field of biomass resource utilization. In this method, lignin is pyrolyzed in a fixed-bed reactor to obtain pyrolysis products; the pyrolysis products are continuously removed by using saturated steam as an extraction solvent to obtain guaiacol products; the pyrolysis temperature is 220 ‑400℃, saturated steam temperature 150‑300℃, saturated steam flow 2.5‑12.5g / min, reaction time 0.5‑2h. The invention realizes the breaking of oxygen-containing ether bonds of lignin components through pyrolysis, realizes continuous removal of pyrolysis products by using saturated steam extraction, improves the yield of liquefied products and selectively prepares guaiacol products. The invention has the advantages of high purity of obtained liquefied product, simple process and easy realization of industrial promotion.

Description

technical field [0001] The invention belongs to the technical field of utilization of biomass resources, and in particular relates to a method for preparing guaiacol products by steam-assisted fixed-bed pyrolysis of lignin. Background technique [0002] The massive use of fossil energy and the resulting depletion of fossil resources, environmental pollution and other issues seriously restrict the sustainable development of the current social economy. Lignin is extracted from the pulping and papermaking process and is considered to be the only renewable aromatic resource in nature, which has great potential in the preparation of chemicals and renewable biofuels with high added value. However, only a small amount (about 2%) of lignin is used as a high value-added material. Therefore, exploring a new degradation method is the key to improving the high value-added utilization of lignin. [0003] Currently, lignin depolymerization methods mainly include pyrolysis, hydrothermal ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C41/00C07C41/18C07C41/42C07C43/23
CPCC07C41/00C07C41/18C07C41/42C07C43/23
Inventor 叶俊蒋剑春徐俊明王奎李静周铭昊夏海虹刘朋王瑞珍赵佳平
Owner INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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