Co-production method for nano calcium carbonate through marsh gas purification

A nano-calcium carbonate and biogas technology, applied in the field of separation engineering, can solve the problems of low energy utilization efficiency and limited application range, and achieve the effects of small footprint, small number of equipment, and simple control

Inactive Publication Date: 2015-12-16
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The calorific value of biogas is about 20-25MJ / m 3 , lm 3 The calorific value of biogas is equivalent to 0.8kg of natural gas, which is higher than the calorific value of biomethane (39.8MJ / m 3 ) is low, its scope of application is limited, and its energy utilization efficiency is low

Method used

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  • Co-production method for nano calcium carbonate through marsh gas purification
  • Co-production method for nano calcium carbonate through marsh gas purification

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] like figure 1 The device for biogas purification and co-production of nano-calcium carbonate shown includes a raw material storage tank 2, a membrane reactor a5, a gas-liquid separator a6, a membrane reactor b7, a gas-liquid reactor b8 and a product storage tank 12 connected in sequence, And the biogas tank 11 and the biogas conveying assembly separately connected to the membrane reactor b8, the gas phase outlet of the gas-liquid separator b8 is connected to the membrane reactor a5; the gas phase outlet of the membrane reactor a5 is connected to the CO 2 A sensor 15; a diverter valve 16 is also provided between the gas-liquid separator a and the raw material storage tank.

[0041] Wherein, the membrane reactor a and the membrane reactor b are the same known structure, the average pore diameter of the dispersed membrane is 6 μm, and 19 microchannels are arranged side by side, and the gas phase is pressed into the other phase by pressure, and the two phases are in Rapid...

Embodiment 2

[0047] The quicklime is digested, matured, filtered and diluted to prepare the lime milk concentrate. In the Ca(OH)2 suspension with a concentration of 3%, add sucrose with a mass ratio of 0.1%, inject it into the raw material storage tank, and enter the membrane reactor a and membrane reactor b in sequence through the control of the pump and flowmeter, and flow to the membrane Feed biogas into reactor b, control the liquid flow rate, and terminate the reaction at pH=6.72. The obtained nano calcium carbonate solution is centrifuged and dried at 70°C. The gas discharged from the membrane reactor a enters the membrane reactor a and then undergoes a purification reaction. The methane content in the carbonized and purified biogas reaches 96% through gas phase detection. Observed under a transmission electron microscope, the calcium carbonate particles have agglomeration phenomenon, the particle size distribution is 40-100nm, and the dispersion effect is not ideal. This shows that...

Embodiment 3

[0049] The quicklime is digested, matured, filtered and diluted to prepare the lime milk concentrate. In the Ca(OH)2 suspension with a concentration of 6%, add sucrose with a mass ratio of 0.5%, inject it into the raw material storage tank, and enter the membrane reactor a and membrane reactor b in sequence through the control of the pump and flow meter, and feed the reaction Feed biogas into device b, control the liquid flow rate, and terminate the reaction at pH=6.82. The obtained nano-calcium carbonate solution is centrifuged and dried at 60°C. The gas discharged from the membrane reactor a enters the membrane reactor a and then undergoes a purification reaction. The methane content in the carbonized and purified biogas reaches 98% through gas phase detection. Observed under a transmission electron microscope, the calcium carbonate particles are cubic (see figure 2 ), the dispersion is good, and the average particle size distribution is about 50nm. This shows that when t...

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Abstract

The invention provides a method for purifying marsh gas to make the methane content of the marsh gas reach the automotive fuel gas standard and obtaining high-added-value nano calcium carbonate in the purifying process. The method includes the steps that quick lime is slaked and filtered to obtain lime milk refined slurry, and the lime milk refined slurry is added into a storage tank of a carbonization device and added with a dispersant; marsh gas is injected into membrane reactors for a carbonization reaction, online monitoring is carried out, and when the pH value is smaller than 7, the reaction is stopped. The membrane reactor a and the membrane reactor b of the process represent a purification stage and a carbonization stage respectively, and the calcium carbonate product carbonized completely is obtained while it is ensured that the marsh gas is completely purified. Calcium carbonate emulsion obtained after the reaction is centrifuged to obtain a calcium carbonate filter cake and dried and smashed to obtain the nano calcium carbonate product. By using the novel membrane reactors, while high-purity biomethane is obtained by purifying the marsh gas, the high-performance nano calcium carbonate can be obtained.

Description

[0001] This case is a divisional application of the invention patent application with the original application number 201410153531.4 and the application date of April 17, 2014. technical field [0002] The invention relates to a biogas purification method, which belongs to the separation engineering technology. The membrane reactor is used to purify biogas to obtain high-purity biomethane, and at the same time obtain nano-calcium carbonate with excellent performance. Background technique [0003] The calorific value of biogas is about 20-25MJ / m 3 , lm 3 The calorific value of biogas is equivalent to 0.8kg of natural gas, which is higher than the calorific value of biomethane (39.8MJ / m 3 ) is low, its application range is limited, and its energy utilization efficiency is low. Some scholars at home and abroad are also researching more use values ​​of biogas. In addition to methane, biogas contains about 40% CO 2 , a small amount of water and hydrogen sulfide. In order to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L3/10C01F11/18B82Y30/00
Inventor 李晖张艳曹逊李干禄韦萍欧阳平凯
Owner NANJING TECH UNIV
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