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Apparatus for treating solutions with high osmotic strength

一种渗透液、溶液的技术，应用在海水的装置领域，能够解决限制发展等问题，达到提高回收率、低要求、高容器生产率的效果

Active Publication Date: 2009-12-09
DOW GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The economics of reverse osmosis desalination, including the large equipment required, may limit the development of this technology

Method used

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  • Apparatus for treating solutions with high osmotic strength
  • Apparatus for treating solutions with high osmotic strength
  • Apparatus for treating solutions with high osmotic strength

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] FILMTEC SW30HR membrane is used to form the membrane element. Four elements having an effective membrane area of ​​2.6 square meters were constructed using FILMTECSW30SXLE membranes. Three SW30SXLE membrane elements were treated as follows: The membranes were immersed in 2000 ppm NaOCl aqueous solution at pH 10.5 for 30 minutes. Table 3 shows the measured standard specific fluxes and standard solute permeability for these elements.

[0082] Table 3. Components described in Example 1

[0083]

component

film

standard specific flux

L / m 2 / hr / bar (gfd / psi)

standard solute permeability

L / m 2 / hr (gfd)

A

SW30HR

1.07 (0.043)

0.29 (0.17)

B

SW30XLE

1.43 (0.058)

0.45 (0.26)

C

SW30XLE (processed)

2.12 (0.086)

0.33 (0.19)

D

SW30XLE (processed)

1.85 (0.075)

0.32 (0.19)

...

Embodiment 2

[0087] Two FILMTEC SW30XLE-380 elements were treated by immersing them for 30 minutes in an aqueous solution at pH 10.5 containing 1500 ppm and 2000 ppm NaOCl, respectively. These elements have the standard specific fluxes and standard solute permeabilities shown in Table 4, rows H and I. In addition, the standard specific flux and standard solute permeability values ​​for the FILMTECS SW30HR-380 and SW30XLE-380 elements not in contact with NaOCl are shown in rows F and G, respectively. The ratio of the standard solute permeability to the standard specific flux of the terminal element (0.064) divided by the ratio of the standard solute permeability to the standard specific flux of the leading element (0.071) is less than 1. For all elements in Table 4, the standard pressure gradient is approximately 0.2 bar / meter and the feed spacer cross-sectional area is approximately 230 cm2.

[0088] Table 4. Components described in Example 2

[0089]

component

...

Embodiment 3 and comparative example 3 and 4

[0097] Use the method of Comparative Example 2 to simulate.

[0098] Tables 5-7 below provide the results of three simulations, each with a feed rate of 174 m3 / day (46000 gpd) of 3.8% seawater and a 50% recovery. Example 3 and Comparative Examples 3 and 4 simulated a pressure vessel containing 6 elements of 35.3 square meters (380 square feet), and the average flux of the vessel was 17 liters per square meter per hour (10 gfd). The specific fluxes (A values) of the membranes used in the elements are all within the easily available range. Assuming that the membrane solute permeability value (B value) is the same (0.068 L / m2 / h) for all elements in the vessel, this value is considered to have the least effect on flux within the operating range tested. The salt passage rate of the permeate from each element is approximately proportional to the assumed B value. For Example 3, Comparative Example 3, and Comparative Example 4, the calculated total permeate concentrations were 369 p...

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Abstract

The present invention relates to a device and a method for treating solutions with high osmotic strength, especially sea water and solutions with osmotic pressure above 20 bar, by passing the solution through a vessel containing a helically wound reverse osmosis or nanofiltration element. The vessel contains at least three elements in series, and at least two of these elements have nominal specific fluxes that differ by at least 50%. The present invention allows for a more uniform flux distribution within the filtration system and can advantageously incorporate variations in element configuration and feed spacers.

Description

technical field [0001] The present invention is an apparatus and method for treating solutions of high osmotic strength, especially seawater, by passing the solution through a vessel containing a helically wound reverse osmosis or nanofiltration element. Our invention produces a more even flux distribution within the vessel. Advantageous properties compared to traditional methods include higher container production rates, improved recovery rates and lower requirements for applied pressure. Background technique [0002] Osmosis is the process by which a solvent passes through a semipermeable membrane and is transferred from a solution of low solute concentration to a solution of high solute concentration (thereby diluting the latter). In reverse osmosis (RO), pressure is applied to the high solute concentration side of the membrane and reverses the chemical potential gradient driving osmosis. The result is that the solvent flows through the membrane from the side of high so...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D63/12B01D61/02C02F1/44
CPCC02F1/44B01D61/027B01D61/025B01D63/12C02F2103/08C02F1/441C02F1/442Y02A20/131
Inventor W·E·米科斯A·R·马什M·H·皮里M·比施S·D·约恩斯S·麦克莱伦
Owner DOW GLOBAL TECH LLC
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