Cracking catalytic circulation method of three reaction cabins

A pyrolysis catalysis and reaction chamber technology, applied in chemical instruments and methods, carbon compounds, inorganic chemistry, etc., can solve the problems of poor product gas delivery, rising pressure in the reaction system, and reduced equipment utilization, and achieve a balanced reaction. Right shift, increase the rate of detachment, improve the effect of diffusion uniformity

Active Publication Date: 2022-04-29
无锡碳谷科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Common problems in these reactors include: 1. Low mass transfer efficiency: (1) Lack of gas path design for raw material gas, resulting in insufficient contact between raw material gas and catalyst, and low effective utilization rate
On the other hand, the hydrogen produced can only diffuse away from the catalyst surface through the same path in the opposite direction.
The shortage of raw material gas and the retention of product gas will inevitably lead to the left shift of the reaction balance and reduce the reaction rate.
(2) The product gas is not carried out smoothly, which leads to the left shift of the reaction balance and the low conversion rate of biogas
(3) Lack of reasonable utilization design for exhaust gas, resulting in waste of resources and increased costs
[0004] 2. Adopting the intermittent operation mode, the equipment cannot realize continuous production. It has to go through the process of heating up, reducing, catalytic cracking, and cooling down. The production preparation time and post-processing time are too long, resulting in a great reduction in equipment utilization
At the same time, product collection and separation are difficult
[0005] 3. Safety risk: As catalysts, carbon products and other impurity particles move with the fluid and deposit in the throat and pores, blockage will be caused, which will lead to the increase of air pressure in the reaction system and threaten the safety of production operations

Method used

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  • Cracking catalytic circulation method of three reaction cabins
  • Cracking catalytic circulation method of three reaction cabins
  • Cracking catalytic circulation method of three reaction cabins

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The present embodiment provides a kind of cracking catalytic cycle method of three reaction chambers, comprising the following steps:

[0035] S1: Prepare the first reaction chamber 01, the second reaction chamber 02, and the third reaction chamber 03; the three reaction chambers have the same structure, which can be easily replaced and used, and the serial numbers are marked between the three reaction chambers for distinction; the three reaction chambers All can independently realize the process of heating, reducing, cracking and catalyzing, and cooling;

[0036] The bottom side of the first reaction chamber 01 is connected with the first feed gas pipe 010; the first gas inlet pipe is made of plastic pipe or metal pipe for guiding the gas flow; the middle part of the first feed gas pipe 010 is connected with the first stop valve 0100; the first stop valve 0100 is used to control the outflow of gas from the middle of the first feed gas pipe 010, and open or close the fi...

Embodiment 2

[0066] S1 step is identical with embodiment 1;

[0067] S2: Heating the temperature of the first reaction chamber 01, the mixed gas composed of nitrogen and hydrogen, the mixed gas is N2:H2=1:1; through the main feed gas pipe 05 and through the three selection valve 04, introduce the first reaction chamber 01 to react, Open the fourth stop valve 0110, the second stop valve 0200, and close the other stop valves; the total flow rate of reducing gas is 1.0L / min, the furnace temperature is 500±10°C, and the reduction time is 30min; reduction reaction: MOx+xH2 →M+xH2O, MOx refers to the metal oxide in the reduction reaction. All other check valves are closed;

[0068] S3: Through the main feed air pipe 05, biogas is introduced into the first reaction chamber 01 for reaction, and the biogas is CH4:H2=10:1; keep the fourth through-stop valve 0110 and the second through-stop valve 0200 in the card open state ;The total flow rate of biogas is 1.5L / min, the furnace temperature is 600±...

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Abstract

The invention discloses a cracking catalytic circulation method of three reaction cabins, which comprises the following steps: S2, heating a first reaction cabin, introducing a mixed gas composed of nitrogen and hydrogen into the first reaction cabin through a main feeding gas pipe and a three-way selection valve for reaction, opening a fourth on-off valve and a second on-off valve, and closing other on-off valves; s3, biogas is introduced into a first reaction cabin for reaction through a main feeding gas pipe, and a fourth on-off valve and a second on-off valve are kept in a clamping opening state; s4, biogas enters a second reaction cabin for reaction through a main feeding gas pipe and a three-phase selection valve, and a fifth on-off valve and a third on-off valve are opened; and taking out the carbon nanotubes in the first reaction cabin for recycling. The mass transfer efficiency of the reaction equipment is improved, and efficient utilization of raw material gas and product gas is realized. The continuous production of reaction equipment is realized, the blank time is eliminated, and the utilization rate of the equipment is greatly improved. And the fluid direction opposite to the gravity direction is adopted, so that the production operation safety is improved.

Description

technical field [0001] The invention belongs to the technical field of chemical production, and in particular relates to a cracking catalytic cycle method with three reaction chambers. Background technique [0002] In the technical field of producing carbon nanotubes by catalytic cracking of biogas (biogas or pure methane) as raw material gas, the currently published reactors for industrial production mainly include fixed bed and fluidized bed. reactor. [0003] Common problems in these reactors include: 1. Low mass transfer efficiency: (1) Lack of gas path design for raw material gas, resulting in insufficient contact between raw material gas and catalyst, and low effective utilization rate. For example, patent CN106917163B shows a fixed-bed reactor with multi-stage cylindrical reaction vessels installed inside. Obviously, when the raw material gas passes through the structural reactor, it will form a channel flow, and only a small amount of raw material gas will reach th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J8/02C01B32/162
CPCB01J8/02B01J8/008C01B32/162
Inventor 王斌雷天辉郁志新
Owner 无锡碳谷科技有限公司
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