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Biogas Membrane Separation and Purification Method for Biomethane Production

A biomethane and membrane separation technology, applied in chemical instruments and methods, gas fuels, ammonia compounds, etc., can solve problems affecting the quality of calcium carbonate, and achieve the effect of low operating and operating costs

Active Publication Date: 2021-04-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing patents do not mention H 2 The whereabouts of S obviously needs to be removed in advance, otherwise the quality of calcium carbonate will be affected

Method used

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  • Biogas Membrane Separation and Purification Method for Biomethane Production

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026]Prepare phosphogypsum into an aqueous solution with a concentration of 3% by mass and add it to the ammonia absorption reactor. The ammoniated phosphogypsum slurry is injected into the liquid inlet of the secondary membrane separator by a slurry pump, and the inlet liquid pressure is kept at 15kPa. The membrane separator is made of polypropylene, and the surface pore size of the membrane is 5 μm. In the second membrane separator, the remaining part of CO in the biogas 2 to remove most of the CO in the biogas in the primary membrane separator 2 and H 2 S is removed, and then the carbonized phosphogypsum suspension slurry enters the solid-liquid separator, calcium carbonate is separated at the bottom, and the liquid at the top enters the crystallizer. After crystallization, the by-product ammonium sulfate compound fertilizer is produced, and the water is reused. After the biogas is drawn out from the biogas raw material gas storage tank, the pressure is 2kPa, and it dire...

Embodiment 2

[0028] Prepare phosphogypsum into an aqueous solution with a concentration of 9% by mass and add it to the ammonia absorption reactor. The ammoniated phosphogypsum slurry is injected into the liquid inlet of the secondary membrane separator by a slurry pump, and the inlet liquid pressure is kept at 25kPa. The membrane separator is made of polytetrafluoroethylene, and the surface pore size of the membrane is 8 μm. In the second membrane separator, the remaining part of CO in the biogas 2 to remove most of the CO in the biogas in the primary membrane separator 2 and H 2 S is removed, and then the carbonized phosphogypsum suspension slurry enters the solid-liquid separator, calcium carbonate is separated at the bottom, and the liquid at the top enters the crystallizer. After crystallization, the by-product ammonium sulfate compound fertilizer is produced, and the water is reused. After the biogas is drawn from the biogas raw material gas storage tank, the pressure is 6kPa, and ...

Embodiment 3

[0030] Phosphogypsum was prepared into an aqueous solution with a mass percent concentration of 15% and added to the ammonia absorption reactor. The ammoniated phosphogypsum slurry was injected into the liquid inlet of the secondary membrane separator by a slurry pump, and the inlet liquid pressure was kept at 40 kPa. The membrane separator is made of polyethersulfone, and the surface pore size of the membrane is 10 μm. In the second membrane separator, the remaining part of CO in the biogas 2 to remove most of the CO in the biogas in the primary membrane separator 2 and H 2 S is removed, and then the carbonized phosphogypsum suspension slurry enters the solid-liquid separator, calcium carbonate is separated at the bottom, and the liquid at the top enters the crystallizer. After crystallization, the by-product ammonium sulfate compound fertilizer is produced, and the water is reused. After the biogas is drawn out from the biogas raw material gas storage tank, the pressure is...

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Abstract

Membrane separation and purification of biogas to produce biomethane process, use waste residue phosphogypsum to prepare slurry, after ammoniation, contact biogas countercurrently in membrane separator to absorb CO 2 and H 2 S, biogas is purified to produce biomethane, and ammonium sulfate compound fertilizer and calcium carbonate are by-products. It is especially suitable for the purification of biogas obtained from various raw materials, and belongs to the technical field of carbon dioxide capture and utilization. The invention avoids the cumbersome gas pretreatment steps required by the single membrane separation method, and realizes the separation-reaction one-step resource utilization of CO 2 , achieved the purpose of treating waste with waste.

Description

technical field [0001] The biogas membrane separation and purification process method for preparing biomethane belongs to the technical field of chemical separation, and specifically relates to the technical field of carbon dioxide capture and utilization. Background technique [0002] Biogas is a combustible mixed gas produced by the fermentation of organic substances by various microbial systems under anaerobic conditions. The main components are methane and carbon dioxide, and it also contains a small amount of hydrogen, carbon monoxide, hydrogen sulfide, oxygen, nitrogen and other gases. In general, CO in biogas 2 The content is 25%~55% (mol), H 2 The S content is between 0.0006% and 2%. The calorific value of untreated biogas is 20.16~28.98 MJ / Nm 3 , with low energy density, it can only be used as civil energy for a long time, while biomethane (CH 4 Purity 99%~100%) calorific value is 38.22 MJ / Nm 3 , can be directly used as a motor fuel as a petroleum substitute. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10L3/10C01F11/18C01C1/245C05C3/00
CPCC01C1/245C01F11/18C05C3/00C10L3/101C10L2290/548
Inventor 于品华孔凡敏
Owner CHINA PETROLEUM & CHEM CORP