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Stable gas membrane and method used for removing, recovering, and gathering ammonia or organic amine from dosage liquor or wastewater

An organic amine and gaseous membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve problems such as difficult to obtain by-product ammonium salt solution, low service life of components, wetting leakage, etc., to eliminate Effects of mass transfer resistance, fluid flow stability, and avoidance of backmixing

Active Publication Date: 2012-02-15
天津凯铂能膜工程技术有限公司
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AI Technical Summary

Problems solved by technology

[0005] However, the current general-purpose gaseous membrane modules have poor stability, are prone to pollution, wetting and leakage, and the service life of the modules is low, which limits their large-scale membrane industry promotion; moreover, using the existing gaseous membrane method to treat feed liquid or wastewater , the deamination process is often accompanied by osmotic distillation of water, that is, because the absorption liquid contains acid and ammonium salts, the saturated vapor pressure of water in the absorption liquid is lower than the saturated vapor pressure of water in the ammonia-containing feed liquid or waste water, resulting in water The net transfer from the ammonia-containing feed solution or waste water to the acid absorption solution results in the dilution of the acid absorption solution, and the higher the concentration of acid and salt in the absorption solution, the more severe the osmotic distillation of water, so it is difficult to obtain the desired by-products high concentration ammonium salt solution

Method used

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  • Stable gas membrane and method used for removing, recovering, and gathering ammonia or organic amine from dosage liquor or wastewater
  • Stable gas membrane and method used for removing, recovering, and gathering ammonia or organic amine from dosage liquor or wastewater
  • Stable gas membrane and method used for removing, recovering, and gathering ammonia or organic amine from dosage liquor or wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] A stable gaseous membrane device made of polypropylene hollow fiber microporous hydrophobic membrane was used to treat dilute ammonia solution. The effective membrane area based on the inner diameter of the hollow fiber membrane A that feed liquid enters is 5.10m 2 , The parameters of the membrane are: outer diameter 0.48mm, inner diameter 0.38mm, average pore diameter 0.02μm, porosity 40%.

[0045] Feed liquid: Ammonia solution: Influent ammonia concentration C 0 =5018ppm, flow rate Q=20L / h, pH=12.3, temperature T=30°C;

[0046] Absorbent: H 2 SO 4 The initial concentration is 5%, the flow rate is 10L / h, and the temperature is 30°C.

[0047] Experimental results: the concentration of ammonia nitrogen in the effluent is 45ppm, the removal rate of ammonia nitrogen is 99.1%, and the mass transfer coefficient is 5.14×10 -6 m / s. After repeated use in many experiments, the concentration of ammonium sulfate in the absorption liquid can reach 28.5%.

[0048] After one m...

Embodiment 2

[0054] The stable gaseous membrane module and its parameters are the same as in Example 1;

[0055] Feed liquid to be treated: imported ammonia nitrogen concentration C 0 =3018ppm, NaCl concentration is 15%, flow Q=20L / h, pH>12, temperature T=30°C;

[0056] Absorbing liquid: sulfuric acid solution with an initial concentration of 5%, flow rate 10L / h, temperature 20°C

[0057] Experimental results: the concentration of ammonia nitrogen in the effluent is 10ppm, the removal rate of ammonia nitrogen is 99.8%, and the mass transfer coefficient is 6.77×10 -6 m / s.

Embodiment 3

[0062] A self-made polypropylene stabilized gaseous membrane module was used to treat solutions containing ammonia and isopropanol. The effective membrane area based on the inner diameter of the hollow fiber membrane A entering the feed liquid is 1.45m 2, The parameters of the membrane are: outer diameter 0.48mm, inner diameter 0.38mm, average pore diameter 0.02μm, porosity 40%.

[0063] Feed liquid: the ammonia content is 5.015% (50150ppm), the isopropanol content is 7.28%, the flow rate is 20L / h, the initial temperature T1=30°C, and the cycle operation;

[0064] Absorbing solution: 15% sulfuric acid solution, flow rate 25L / h, initial temperature T2=42°C (caused by sulfuric acid dilution heat), cycle operation, when the pH of the absorbing solution flowing out of outlet 4>2, add more to the acid absorbing solution storage tank 98% concentrated sulfuric acid.

[0065] Experimental results:

[0066] The concentration of ammonia nitrogen in the treated feed liquid or wastewat...

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Abstract

The invention relates to a stable gas membrane used for removing, recovering, and gathering ammonia or organic amine from dosage liquor or wastewater. The gas membrane comprises a membrane shell, hollow fibrous membranes (A) and hollow fibrous membranes (B). A cavity is provided in the middle of the membrane shell. An inlet and an outlet are respectively arranged on each of the two ends of the membrane shell. The hollow fibrous membranes (A) and the hollow fibrous membranes (B) are positioned in the cavity of the membrane shell. A shell pass outlet communicating with the atmosphere is arranged on a lower end of the membrane shell. The hollow fibrous membranes (A) and the hollow fibrous membranes (B) are uniformly arranged in the membrane shell with regular spaces. Dosage liquor or wastewater containing ammonia or organic amine is delivered through the tube pass of the hollow fibrous membranes (A), and absorption liquid is delivered through the tube pass of the hollow fibrous membranes(B). With the gas membrane provided by the invention, problems of traditional gas membranes of leakage and low service life are overcome; dilution of a byproduct ammonium salt solution caused by a concomitant osmotic distillation phenomenon can be effectively inhibited; ammonium salt concentration of the byproduct ammonium salt solution can be increased from 10-20% to 20-40%; mass transfer coefficient at the acid absorption liquid side can be substantially improved; the ammonia removing efficiency is high; the ammonia removing effect is stable for a long-term; and the service life of membranesets can be improved by 3-10 times than common gas membranes.

Description

technical field [0001] The invention belongs to the field of environmental protection and wastewater treatment methods, in particular to a stable gaseous membrane device and method for removing, recycling, and enriching ammonia or organic amines in feed liquid or wastewater. Background technique [0002] Many industries, including petrochemicals, fine chemicals, fertilizers, coal chemicals, pharmaceuticals, pesticides, non-ferrous and rare metal smelting, electronics and municipal waste treatment, produce feed liquids containing ammonia or organic amines or discharge waste water containing ammonia or organic amines. The daily discharge is several million tons, and the concentration of ammonia or amine is tens to tens of thousands of milligrams per liter. Ammonia nitrogen in wastewater is an important substance for water eutrophication and environmental pollution. It can easily cause algae and some microorganisms to multiply in a short period of time, and consume dissolved ox...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D63/02B01D61/00
Inventor 秦英杰何菲刘立强崔东胜吴茵赵建敏
Owner 天津凯铂能膜工程技术有限公司
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