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A method for promoting the depolymerization of kraft lignin by using discarded cigarette filters

A kraft lignin and filter technology, which is applied in the field of waste resource utilization, can solve the problems that kraft lignin is difficult to depolymerize effectively, and achieve the effects of increasing utilization value, increasing yield, and improving depolymerization efficiency

Active Publication Date: 2020-11-06
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for promoting the depolymerization of kraft lignin by using discarded cigarette filters, which is used to solve the current problems that kraft lignin is difficult to effectively depolymerize, and at the same time, it is beneficial to turn discarded cigarette filters into treasures. Realize high value use

Method used

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  • A method for promoting the depolymerization of kraft lignin by using discarded cigarette filters

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035]Mix 10g of kraft lignin with a particle size of 0.3mm to 0.5mm, 10g of discarded cigarette filters crushed to a particle size of 0.6 to 1mm, and 10g of sodium carbonate with a particle size of 500 to 800nm, and then grind the mixture evenly. Pressurize for 0.5 minutes under the condition of 30MPa, and press it into a cylindrical shape. The cylindrical mixture was placed in a microwave reactor, and nitrogen gas was introduced at 120 mL / min for 5 minutes, and then the nitrogen gas was passed through a Montessori scrubber bottle filled with dichloromethane to carry the dichloromethane with the nitrogen gas, and the carrying amount was 600 mg / min. After 5 minutes, the microwave reactor was turned on, the microwave frequency was 2.45GHz, the microwave power was 1500W, the temperature was raised to 700°C, and the temperature was kept for 10 minutes. The generated depolymerization vapor was condensed at -40°C, and 24.2g of dichloromethane was collected. The liquid product - pyr...

Embodiment 2

[0037] 10g of kraft lignin with a particle size of 0.1mm to 0.3mm was mixed with 5g of discarded cigarette filters with a particle size of 0.4 to 0.6mm and 5g of ferric oxide with a particle size of 800nm ​​to 0.2mm, and then ground. The ground mixture was pressurized for 5 minutes under the condition of 15 MPa, and pressed into a square shape. Place the square mixture in a microwave reactor, feed nitrogen gas at 60mL / min for 7 minutes, then pass the nitrogen gas through a Montessori scrubber bottle filled with dichloromethane to make the nitrogen gas carry dichloromethane, the carrying amount is 240mg / min, 5 Minutes later, the microwave reactor was turned on, the microwave frequency was 2.45GHz, the microwave power was 1200W, the temperature was raised to 600°C, and the temperature was kept for 20 minutes. The generated depolymerization vapor was condensed at -30°C, and 18.4g of dichloromethane was collected Liquid product - pyrolysis oil. Then close the microwave reactor, r...

Embodiment 3

[0039] Mix 10g of kraft lignin with a particle size of 0.01 to 0.1mm, 0.5g of discarded cigarette filters crushed into a particle size of 0.1 to 0.4mm, and 2g of silicon carbide with a particle size of 0.2 to 0.5mm, and then grind them evenly. The mixture was pressurized at 8MPa for 10 minutes and pressed into a rhombus shape. Put the rhombohedral mixture in a microwave reactor, pass nitrogen gas at 12.5 mL / min for 10 minutes, then pass nitrogen gas through a Montessori gas scrubber bottle filled with dichloromethane to carry dichloromethane with the nitrogen gas, and the carrying amount is 37.5 mg / min After 5 minutes, turn on the microwave reactor, the microwave frequency is 2.45GHz, the microwave power is 800W, the temperature is raised to 500°C, and the temperature is kept for 30 minutes. The generated depolymerization vapor is condensed at -20°C, and 10g of dichloromethane is collected. The liquid product - pyrolysis oil. Then close the microwave reactor, remove the Monte...

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Abstract

The invention discloses a method for promoting depolymerization of lignin sulfate through filter tips of abandoned cigarettes. According to the method, after the filter tips of the abandoned cigarettes are smashed, the smashed filter tips are mixed uniformly with the lignin sulfate and a microwave absorption medium, then a mixture is ground, and the ground mixture is pressed into massive mixturesin different shapes; the massive mixtures are put in a microwave reactor, nitrogen is introduced in advance to discharge air in a reaction system, then nitrogen carrying dichloromethane is introducedinto the microwave reactor, the microwave reactor is started up, and generated depolymerization steam is condensed to obtain liquid, namely pyrolytic oil; the pyrolytic oil is subjected to airtight standing at normal temperature, a low-layer organic phase is collected, the collected organic phase is dehydrated, an organic phase which does not contain moisture is obtained and subjected to normal-temperature rotary evaporation, when no distillate is distilled off, a substance which is not evaporated out is a phenol-rich compound, a liquid substance which is evaporated out is dichloromethane, andthen recycling is achieved.

Description

technical field [0001] The invention belongs to the field of waste resource utilization, and in particular relates to a method for promoting the depolymerization of kraft lignin by using waste cigarette filter tips. Background technique [0002] Kraft lignin is the main by-product of kraft pulping. It exists in the black liquor produced during the pulping process. The black liquor is usually concentrated in the alkali recovery section and burned to recover alkali, resulting in direct combustion of a large amount of lignin resources. Processing, use of low added value. Kraft lignin has the potential to replace traditional fossil resources to produce high-value fine chemicals such as monophenolic compounds due to its rich aromatic rings and a large number of hydroxyl active functional groups. Rapid pyrolysis technology is one of the thermochemical conversion technologies with great application prospects and development potential for high-value conversion of lignin resources. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C43/23C07G1/00C07C41/01C07C37/00C07C39/04C07C39/07C07C45/51C07C47/58C07C51/00C07C65/21
CPCC07C37/00C07C41/01C07C45/51C07C51/00C07G1/00C07C43/23C07C39/04C07C39/07C07C47/58C07C65/21
Inventor 王文亮黄佳乐王旭彪赵兴金
Owner SHAANXI UNIV OF SCI & TECH
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