Method for preparing aromatic hydrocarbon compound through blending pyrolysis of lignin and low-density polyethylene or polycarbonate or polystyrene

A low-density polyethylene and polystyrene technology, which is applied in the preparation of hydrocarbons, hydrocarbons, and organic compounds, can solve the problems of difficult conversion and degradation, and achieve the goal of reducing the amount of residual carbon, promoting the generation, and cleaning the process Effect

Inactive Publication Date: 2017-02-22
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the characteristics of plastic, it is not easy to transform and degrade after being disposed of in the environment. How to effectively deal with waste plastic products has become a focus issue

Method used

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  • Method for preparing aromatic hydrocarbon compound through blending pyrolysis of lignin and low-density polyethylene or polycarbonate or polystyrene
  • Method for preparing aromatic hydrocarbon compound through blending pyrolysis of lignin and low-density polyethylene or polycarbonate or polystyrene
  • Method for preparing aromatic hydrocarbon compound through blending pyrolysis of lignin and low-density polyethylene or polycarbonate or polystyrene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Reaction conditions: Weigh 1mg of black liquor lignin, low-density polyethylene, polycarbonate and polystyrene as a separate pyrolysis sample, and weigh 0.5mg of lignin and 0.5mg of low-density polyethylene (polycarbonate or polystyrene) Styrene), 0.5 mg of lignin was mixed with 0.5 mg of the above three polymers as a blend. Put 7 kinds of samples into quartz tubes respectively, fix both ends with quartz wool, and put them into a hot wire type fast pyrolyzer for fast pyrolysis reaction. The fast pyrolyzer is connected with gas chromatography mass spectrometry (GCMS), and the volatiles generated by pyrolysis can be detected by GCMS. The reactant is set in the fast pyrolyzer at a temperature of 500-900°C, and the heating rate is 20°C / ms to carry out the pyrolysis reaction. According to GCMS analysis, lignin and the above-mentioned polymers are blended and pyrolyzed, and the composition of the pyrolysis oil has changed to a certain extent.

[0019] Figure 1-3 The compa...

Embodiment 2

[0024] Based on the results of Example 1: rapid pyrolysis of lignin and polystyrene can effectively promote the formation of monomeric aromatic hydrocarbons, so lignin and polystyrene were selected as raw materials for the study of Example 2.

[0025] A certain amount of lignin and polystyrene were weighed and mixed, and the mass ratio of lignin to polystyrene in the mixture was about 1:4 and 4:1. Put the blends into quartz tubes respectively, fix both ends with quartz wool, and put them into a hot wire type fast pyrolyzer. The pyrolysis reaction is carried out at 20°C / ms. The fast pyrolyzer is connected with gas chromatography mass spectrometry (GCMS), and the volatiles generated by pyrolysis can be detected by GCMS. In order to analyze the effect of the blending ratio of lignin and polystyrene on the main aromatic hydrocarbons in the pyrolysis products.

[0026] Figure 4 The theoretical and experimental value comparison of the peak area of ​​aromatic hydrocarbons in the ...

Embodiment 3

[0028] Weigh 10mg of lignin and polystyrene as a separate pyrolyzed sample, and weigh 5mg of lignin and 5mg of polystyrene, mix them uniformly to obtain a blend, and pass the three samples through a thermogravimetric infrared spectrometer ( TG-FTIR) for detection of weightlessness and gas evolution. The heating range of TG-FTIR is 25-900°C, and the heating rate is set at 20°C / min. The pyrolysis weight loss and weight loss rate curves of lignin and polystyrene blends are as follows: Figure 5 As shown, the escape of small molecules during the blending and pyrolysis of the two is as follows Image 6 shown. from Figure 5 It can be seen that there is a certain interaction between lignin and polystyrene mixed pyrolysis. Table 2 shows the values ​​of the characteristic points of the TG and DTG curves of the three samples. There is no significant difference between the theoretical and actual weight loss range and the maximum weight loss rate of blend pyrolysis, but from the wei...

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Abstract

The invention discloses a method for preparing an aromatic hydrocarbon compound through blending pyrolysis of lignin and low-density polyethylene or polycarbonate or polystyrene. After the lignin and a high-molecular polymer is mixed according to a certain mass ratio, the distribution condition of blending pyrolysis products is inspected by adopting a Py-GCMS analytical means, wherein the temperature is set at 500 DEG C to 900 DEG C, and the temperature increasing rate is set at 20 DEG C/ms; the yield of aromatic hydrocarbon in the blending pyrolysis products of the lignin and polystyrene is obviously increased. Further, the weight loss condition and the small molecule escaping condition in the blending pyrolysis process of the lignin and polystyrene is inspected by adopting a TG-FTIR analytical means, wherein the temperature increasing range is set at to range from 20 DEG C to 900 DEG C, and then the blending pyrolysis mechanism is analyzed. The mode that the lignin is subjected to blending pyrolysis with low-density polyethylene or polycarbonate or polystyrene is low in cost and clean in process; meanwhile, by means of blending pyrolysis of the lignin and polystyrene, the generation amount of monomeric aromatic hydrocarbon can be effectively promoted, and directive guidance is provided for resource utilization of papermaking waste liquid and waste plastic.

Description

technical field [0001] The invention relates to the field of new energy technology, in particular to a method for preparing aromatic compounds by blending and pyrolyzing lignin with low-density polyethylene, polycarbonate or polystyrene. Background technique [0002] Biomass resources are widely distributed, renewable, CO 2 Zero emissions and SO X and NO X Features such as low emissions. Biomass pyrolysis technology can obtain chemical fuels such as bio-oil, coke and combustible gas under anaerobic conditions, and is internationally recognized as one of the most potential biomass conversion technologies. [0003] As one of the three major components of biomass, lignin is a complex, non-crystalline, three-dimensional net-like natural organic compound with aromatic rings. Every year, the by-product black liquor of global paper mills contains about 50 million tons of lignin. However, due to many problems such as complex structure, uneven physical and chemical properties, di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C1/00C07C4/22C07C15/04C07C15/06C07C15/02C07C37/54C07C39/04C07C39/07C07C39/06C07C39/16C07C39/15C07C41/18C07C43/253C07C39/08
CPCC07C1/00C07C4/22C07C37/54C07C41/18C07C15/04C07C15/06C07C15/02C07C15/58C07C39/04C07C39/07C07C39/06C07C39/16C07C39/15C07C43/253C07C39/08
Inventor 沈德魁金伟肖睿
Owner SOUTHEAST UNIV
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