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Method for removing and recycling volatile alcohol organic matters in water

A recovery method and organic matter technology, applied in chemical instruments and methods, organic chemistry, separation/purification of hydroxyl compounds, etc., can solve problems such as increased impact, operating impact, discontinuous stripping, etc., to reduce condensation and improve Flux, the effect of reducing the effect of wetting

Inactive Publication Date: 2012-04-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] CN101659451 An air-lift membrane distillation high-salt water treatment method adopts pulsed air intake, which increases the impact on the membrane itself, and at the same time causes the stripping effect to be discontinuous, and also causes an impact on the operation of the vacuum side;

Method used

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  • Method for removing and recycling volatile alcohol organic matters in water
  • Method for removing and recycling volatile alcohol organic matters in water
  • Method for removing and recycling volatile alcohol organic matters in water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] The effluent of the methanol distillation tower containing 0.55wt% methanol is treated by air-lift vacuum membrane distillation. The main water quality characteristics are: water 99.15wt%, methanol 0.55wt%, ethanol 2370mg / L, isopropanol 170mg / L, n-propanol 130mg / L, n-butanol 30mg / L, isoamyl alcohol 60mg / L, n-pentanol 30mg / L, isooctane 40mg / L, solid content 12mg / L, others 120mg / L, clear appearance, pH 6 ~8. For a schematic diagram of the process, see figure 1 .

[0059] The membrane module used is polyvinylidene fluoride hydrophobic membrane module. Firstly, nitrogen gas is mixed into the water through the gas mixing device, the gas-water volume ratio is 0.2:1, and the water temperature is 65°C. The mixed water enters the inlet side of the membrane module, its average flow velocity in the fiber is 0.6m / s, and the vacuum degree of the cold side of the membrane module is -0.08MPa.

[0060] Since the pressure on the outlet side of the membrane module is lower than the s...

Embodiment 2

[0063] The water containing 5.0wt% methanol was treated by air-lift vacuum membrane distillation. The water was the condensed water on the permeate side of Example 1. The concentration of methanol was 5.0wt%, and the concentration of ethanol was 1.7wt%. For a schematic diagram of the process, see figure 1 .

[0064] The membrane module used is polyvinylidene fluoride hydrophobic membrane module. Firstly, nitrogen gas is mixed into the water through the gas mixing device, the gas-water volume ratio is 0.5:1, and the temperature is 45°C. The mixed water enters the inlet side of the membrane module, its average flow velocity in the fiber is 0.3m / s, and the vacuum degree of the cold side of the membrane module is -0.08MPa.

[0065] After passing through the gas condensation, the concentration of methanol in the condensate is 46wt%, enriched by 9.2 times, and the concentration of ethanol is 12wt%, enriched by 7.1 times; the concentration of methanol in the waste water after treat...

Embodiment 3

[0067] The effluent of the methanol distillation tower containing 0.55wt% methanol is treated by air-lift vacuum membrane distillation. The schematic diagram of the process flow is shown in figure 1 .

[0068] The composition of water is the same as in Example 1.

[0069] The membrane module used is a polypropylene hydrophobic membrane module. Firstly, air is mixed into the water through an air mixing device, the air-water volume ratio is 0.5:1, and the temperature is 45°C. The mixed water enters the inlet side of the membrane module, its flow velocity in the membrane fiber is 0.6m / s, and the vacuum degree of the cold side of the membrane module is -0.08MPa.

[0070] After passing through the gas condensation, the concentration of methanol in the condensate was measured to be 5.5wt%, which was enriched by 10 times, and the concentration of ethanol was 1.9wt%, which was enriched by 8 times; the concentration of methanol in the treated waste water was 0.03wt%, The concentrati...

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Abstract

The invention relates to a method for removing and recycling volatile alcohol organic matters in water. The method comprises the following steps of: 1, mixing a certain ratio of gas into feeding side waste water; 2, making gas and liquid continuously enter a vacuum film distilling assembly together, vacuumizing a seepage side, and condensing gas, water stream and organic matter steam in waste water on the seepage side through a seepage film hole; 3, making volatile organic matters pass through a hydrophobic film for enriching; and 4, directly reapplying waste water which reaches the use requirements to the production process, if the waste water does not reach the use requirements, performing further treatment. In the method, gas is mixed into a feeding liquid, and the gas and liquid continuously enter the vacuum film distilling assembly together, so that a layer of air film is formed more easily on the surface of a feeding side film, the wetting influence of water and an organic solvent on the hydrophobic film is lowered, the disturbance action in waste water is enhanced, the condensation of steam in the film hole is reduced simultaneously, the running cycle of the film assembly is prolonged, and the flux of the film is increased.

Description

technical field [0001] The invention relates to a process for removing and recovering volatile organic compounds in water, in particular to a method for removing and recovering volatile alcohol organic compounds in water. In particular, it refers to an air-lifting vacuum membrane distillation treatment method for waste water containing volatile alcoholic organic compounds. Background technique [0002] The wastewater containing methanol and ethanol comes from the wastewater generated during the production or utilization of methanol and ethanol, such as the distillation raffinate discharged from the bottom of the rectification tower. The main component is soft water, which is usually relatively clear, and the main pollutant is methanol or ethanol , its mass fraction is about 0.03% to 5%, and the rest of the pollutants are trace organic matter, mainly containing higher alcohols, aldehydes, ethers, etc., and also containing a small amount of long-chain compounds. [0003] Meth...

Claims

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Application Information

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IPC IPC(8): C02F1/20C02F1/04C02F1/58C07C31/04C07C31/08C07C29/76
Inventor 高凤霞张新妙程学文莫馗张宾
Owner CHINA PETROLEUM & CHEM CORP
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