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Antisludging agent for hot method during sea water desalination

A technology of antiscalant and thermal method, which is applied in seawater treatment, descaling and water softening, chemical instruments and methods, etc., and can solve problems such as inapplicability

Active Publication Date: 2014-07-02
WEIHAI XIANGYU TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this antiscalant is specially used in the low-temperature multi-effect distillation seawater desalination process. The maximum evaporation temperature of this process does not exceed 70 ° C. It is not suitable for vertical tube evaporation in multi-stage flash evaporation and multi-effect distillation.

Method used

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  • Antisludging agent for hot method during sea water desalination

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Select raw materials by weight percentage

[0030] Deionized water 38.5%

[0031] Isopropanol 5%

[0032] Benzotriazole 1%

[0033] Hydrolyzed Polymaleic Anhydride 25%

[0034] Ethylenediaminetetramethylenephosphonic acid 7.5%

[0035] Carboxyethylthiosuccinate 3%

[0036] Sodium styrene sulfonate-acryloyl morpholine copolymer 20%

[0037] Add 38.5% deionized water to the reactor; then add 5% isopropanol to the reactor, mix and stir for 10 to 20 minutes; add 1% benzotriazole to the stirred solution, and Stir for 20-60 minutes; add 25% hydrolyzed polymaleic anhydride to the stirred solution, and stir for 10-30 minutes; add 7.5% ethylenediamine tetramethylene phosphonic acid to the stirred solution , and stir for 5 to 15 minutes; add 3% hydroxyethyl thiosuccinic acid to the above stirred solution, and stir for 5 to 15 minutes; add 20% styrenesulfonic acid to the above stirred solution sodium-acryloyl morpholine copolymer, and stirred for 15 to 45 minutes.

Embodiment 2

[0039] Select raw materials by weight percentage

[0040] Deionized water 36%

[0041] Ethylene glycol 8%

[0042] Tolylbenzotriazole 1%

[0043] Hydrolyzed Polymaleic Anhydride 15%

[0044] Ethylenediaminetetramethylenephosphonic acid 5%

[0045] Carboxyethylthiosuccinate 5%

[0046] Sodium styrene sulfonate-acryloyl morpholine copolymer 30%

[0047] Add 36% deionized water in the reactor; then add 8% ethylene glycol in the reactor, mix and stir for 10 to 20 minutes; add 1% tolyltriazole to the stirred solution, and Stir for 20 to 60 minutes; add 15% hydrolyzed polymaleic anhydride to the above stirred solution, and stir for 10 to 30 minutes; add 5% ethylenediamine tetramethylene phosphonic acid to the above stirred solution , and stirred for 5 to 15 minutes; added 5% hydroxyethyl thiosuccinic acid to the stirred solution, and stirred for 5 to 15 minutes; added 30% styrenesulfonic acid to the stirred solution sodium-acryloyl morpholine copolymer, and stirred for 15 to ...

Embodiment 3

[0048] Example 3 Anti-calcium carbonate scale performance experiment

[0049] The measurement of scale inhibition performance of the present invention adopts seawater concentration of 2 times in Weihai Economic Zone, then adds 250mL of concentrated seawater into a 500mL volumetric flask, and adds 1.0mL of scale inhibitor sample solution (concentration is 5000mg / L) with a pipette. Make the amount of anti-scaling dispersant to 5mg, shake well. Dilute to the mark with sea water and shake well. Place the test solution in a constant temperature water bath at (80±1)°C, place it at a constant temperature for 10 hours, take it out, cool it to room temperature and filter it with a medium-speed filter paper, and titrate the filtrate with a 0.01mol / LEDTA standard solution to determine the residual Ca 2+ Concentration, the scale inhibition rate is calculated according to the following formula:

[0050] Scale inhibition rate = (C 1 -C 2 ) / (C 0 -C 2 )

[0051] where C 1 is the Ca afte...

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Abstract

The invention provides an antisludging agent for a hot method during sea water desalination. The antisludging agent for the hot method during sea water desalination contains deionized water, alcohols, imidazoles, hydrolytic polymaleic anhydride, ethylenediamine tetramethylene phosphonate, carboxyethylthiosuccinic acid and acryloyl morph copolymer in mass percent of (30-60):(2-8):(0.5-1.5):(5-35):(5-10):(2-15):(15-30). The antisludging agent for the hot method during sea water desalination can be applied to a multiple-effect distillation and multi-stage flash distillation system, has good inhibiting effect and dispersing effect on multiple dirts such as calcium carbonate and calcium sulphate, has a good copper corrosion inhibiting effect and does not influence smell and colour of a water product.

Description

technical field [0001] The invention belongs to the field of seawater desalination, and in particular relates to a compound scale inhibitor for multistage flash evaporation or multi-effect distillation of seawater desalination. Background technique [0002] The UN's research report on unconventional water sources pointed out that in the 35 years from 1950 to 1985, the development of seawater desalination has gone through three stages, namely, the discovery stage, the development stage and the commercialization stage. Research and development efforts during this period were mainly focused on distillation, freezing, electrodialysis and reverse osmosis. In the following ten years, distillation and reverse osmosis have played a greater role, forming the main body of contemporary seawater desalination and brackish water desalination technology and market. [0003] According to the principle and method of separation, seawater desalination technology can be divided int...

Claims

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Application Information

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IPC IPC(8): C02F5/10C02F1/04C02F1/06C02F103/08
CPCY02A20/124
Inventor 孙晓丹李洪社喻果
Owner WEIHAI XIANGYU TECH
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