Method for co-production of nitrogen-containing heterocyclic chemicals and nitrogen-doped carbon by nitrogen-rich catalytic pyrolysis

A technology of catalytic pyrolysis and nitrogen heterocycle, applied in organic chemistry, carbon preparation/purification, etc., can solve problems such as corrosion, low selectivity of liquid products, difficulty in balancing liquid and solid products, etc., achieve low cost, increase ammonia Utilization rate, low corrosion effect

Active Publication Date: 2020-06-19
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
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Problems solved by technology

[0005] In view of the above defects or improvement needs of the prior art, the object of the present invention is to provide a method for the co-production of nitrogen-containing heterocyclic chemicals and nitrogen-doped carbon by nitrogen-rich catalytic pyrolysis, wherein the overall flow process design of the method, participation in The reactants of the reaction are improved. By introducing a small proportion of activators, combined with ammonia and molecular sieve catalysts, the conversion of organic solid waste to nitrogen-containing heterocyclic chemicals and porous nitrogen-doped carbon can be realized. The preparation process is green and environmentally friendly. Low corrosion, high selectivity of nitrogen-containing heterocyclic chemicals, good compatibility of liquid and solid products, effectively improving the utilization value of organic solid waste, compared with the existing technology, it can effectively solve the problem of high value-added utilization of organic solid waste and liquid products Problems such as low selectivity, equipment corrosion, and difficulty in balancing liquid and solid products

Method used

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  • Method for co-production of nitrogen-containing heterocyclic chemicals and nitrogen-doped carbon by nitrogen-rich catalytic pyrolysis

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Embodiment 1

[0046] The embodiment of the present invention describes a method for nitrogen-rich catalytic pyrolysis to co-produce nitrogen-containing heterocyclic chemicals and nitrogen-doped carbon. The method specifically includes the following steps:

[0047] S1: After crushing the sawdust, soak it with excess wood vinegar for 24 hours to remove impurities such as alkali metals in the sawdust, filter, rinse and dry to obtain pickled raw materials, the drying temperature is 105°C, and the drying time is 24 hours ,

[0048] S2: Fully mechanically mix the acid-washed sawdust with the green activator, the green activator KHCO 3 The mass ratio with sawdust is 1:20 to obtain a mixed sample,

[0049] S3: Put 2g of the mixed sample into the first stage of a two-stage fixed-bed reactor (diameter 45mm, length 60cm), and feed pure ammonia gas for nitrogen-enriched pyrolysis reaction, ammonia gas and green activator KHCO 3 The synergistic effect promotes the pore-forming reaction of sawdust mixe...

Embodiment 2

[0056] S1: After crushing the sawdust, soak it with excess wood vinegar for 24 hours to remove impurities such as alkali metals in the sawdust, filter, rinse and dry to obtain pickled raw materials, the drying temperature is 105°C, and the drying time is 24 hours ,

[0057] S2: Fully mechanically mix the acid-washed sawdust with the green activator, the green activator KHCO 3 The mass ratio with sawdust is 1:15 to obtain a mixed sample,

[0058] S3: Put 2g of the mixed sample into the first stage of a two-stage fixed-bed reactor (diameter 45mm, length 60cm), and feed pure ammonia gas for nitrogen-enriched pyrolysis reaction, ammonia gas and green activator KHCO 3 The synergistic effect promotes the pore-forming reaction of sawdust mixed with nitrogen. The reaction temperature is 550°C, the reaction time is 20min, and the ammonia flow rate is 200mL / min.

[0059] S4: Pass nitrogen-rich pyrolysis volatiles into the second stage of the two-stage fixed-bed reactor, and carry out ...

Embodiment 3

[0065] S1: After crushing the sawdust, soak it with excess wood vinegar for 24 hours to remove impurities such as alkali metals in the sawdust, filter, rinse and dry to obtain pickled raw materials, the drying temperature is 105°C, and the drying time is 24 hours ,

[0066] S2: Fully mechanically mix the acid-washed sawdust with the green activator, the green activator KHCO 3 The mass ratio with sawdust is 1:10 to obtain a mixed sample,

[0067] S3: Put 2g of the mixed sample into the first stage of a two-stage fixed-bed reactor (diameter 45mm, length 60cm), and feed pure ammonia gas for nitrogen-enriched pyrolysis reaction, ammonia gas and green activator KHCO 3 The synergistic effect promotes the pore-forming reaction of sawdust mixed with nitrogen. The reaction temperature is 600°C, the reaction time is 40min, and the ammonia flow rate is 500mL / min.

[0068]S4: Pass nitrogen-rich pyrolysis volatiles into the second stage of the two-stage fixed-bed reactor, and carry out o...

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Abstract

The invention belongs to the field of organic solid waste utilization, and discloses a method for co-production of nitrogen-containing heterocyclic chemicals and nitrogen-doped carbon by nitrogen-richcatalytic pyrolysis. The method comprises the following steps: crushed organic solid waste sufficiently reacts with acid to remove alkali metals and other impurities in the organic solid waste; then,the solid carbon product forms a developed pore structure under the synergistic effect of sufficient ammonia gas and a small amount of activating agent, rich active nitrogen-containing functional groups are enriched, and the porous nitrogen-doped carbon material is obtained; meanwhile, a large number of nitrogen-containing intermediates are formed and react under the action of a molecular sieve catalyst to obtain a large number of nitrogen-containing heterocyclic chemicals. A small proportion of activating agent is introduced and cooperated with ammonia gas and the molecular sieve catalyst, conversion from organic solid waste to nitrogen-containing heterocyclic chemicals and porous nitrogen-doped carbon can be achieved, the preparation process is environmentally friendly, equipment corrosion is small, the selectivity of the nitrogen-containing heterocyclic chemicals is high, liquid-solid products are good in consideration and the utilization value of the organic solid waste is effectively improved.

Description

technical field [0001] The invention belongs to the field of organic solid waste utilization, and more specifically relates to a method for nitrogen-enriched catalytic pyrolysis to co-produce nitrogen-containing heterocyclic chemicals and nitrogen-doped carbon. Background technique [0002] With the rapid development of the economy and society, the discharge of various organic solid wastes in the process of life is increasing. According to statistics, in 2018, the annual volume of urban waste removal in my country has exceeded 200 million tons. It is of great significance to reduce the pollution of organic solid wastes to the environment. Therefore, how to treat organic solid waste in a harmless, resourceful, and high-value manner is an important research direction at present. Organic solid waste pyrolysis can effectively convert organic solid waste into high-value gas, liquid, and carbon products, but the added value of its products still needs to be further improved. [0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/05C07D207/323C07D213/06C07D213/09
CPCC07D207/323C07D213/06C07D213/09C01B32/05
Inventor 陈伟陈应泉杨海平王贤华邵敬爱杨晴张雄陈旭张世红陈汉平
Owner HUAZHONG UNIV OF SCI & TECH
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