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Scale inhibitor and dispersant for 3 times concentrated low temperature multi-effect seawater desalination and preparation method

A scale inhibitor dispersant, low temperature technology, applied in chemical instruments and methods, seawater treatment, descaling and water softening, etc., can solve the problems of shortage, high operation cost, difficulty in popularizing LT-MED, etc., and achieve excellent inhibition effect, Excellent dispersion effect

Active Publication Date: 2018-11-13
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional acidification treatment and antiscalant addition control technology can no longer meet the requirements of high-rate concentration of seawater, and it is necessary to develop antiscalant with better performance and research integrated optimization treatment technology; on the other hand, the current large-scale low-temperature multi-effect device Most of the scale inhibitors used are imported, and the operating costs are high, which brings difficulties to the promotion of LT-MED
Domestic research on low-temperature multi-effect distillation scale inhibitors is still relatively lacking, and there are few reports on the synthesis and application of LT-MED scale inhibitors

Method used

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  • Scale inhibitor and dispersant for 3 times concentrated low temperature multi-effect seawater desalination and preparation method
  • Scale inhibitor and dispersant for 3 times concentrated low temperature multi-effect seawater desalination and preparation method
  • Scale inhibitor and dispersant for 3 times concentrated low temperature multi-effect seawater desalination and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Table 1 shows the water quality of seawater during implementation of a scale inhibitor and dispersant for 3 times concentrated low-temperature multi-effect seawater desalination of the present invention.

[0015] Table 1. Water quality indicators of seawater

[0016]

[0017]

[0018] According to the anti-scaling and dispersing agent prepared according to the weight percentage, first add 20% distilled water in the reactor, then add 0.5% thiourea in the reactor, stir for 20 minutes, add 30% polyacrylic acid, 5% polymer horse Maleic acid, 20% maleic anhydride-styrene sulfonate-acrylamide-alkyl allyl glyceryl ether (relative molecular weight: 2000), 10% 2-phosphonobutane-1,2,4-tricarboxylic acid, 10% ethylene glycol, and stirred for 40 minutes; finally the remaining 4.5% water was added and stirred for 40 minutes.

[0019] Scale inhibition performance test: Add 750mL seawater to a 1000mL volumetric flask, add 3-5mg / L scale inhibition dispersant, concentrate 3 times...

Embodiment 2

[0024] Sea water quality is the same as embodiment 1.

[0025] According to the antiscaling and dispersing agent prepared according to the weight percentage, first add 20% distilled water in the reactor, then add 1% thiourea in the reactor, stir for 30 minutes, add 28% polyacrylic acid, 5% polymer horse Maleic acid, 15% maleic anhydride-styrene sulfonate-acrylamide-alkyl allyl glyceryl ether (relative molecular weight: 2000), 12% 2-phosphonobutane-1,2,4-tricarboxylic acid, 9% ethylene glycol and stirred for 60 minutes; finally the remaining 10% water was added and stirred for 30 minutes.

[0026] The scale inhibition performance test is the same as that in Example 1.

Embodiment 3

[0028] Sea water quality is the same as embodiment 1.

[0029] According to the anti-scaling dispersant prepared according to the weight percentage, first add 20% distilled water in the reactor, then add 0.5% thiourea in the reactor, stir for 25 minutes, add 25% polyacrylic acid, 7% polymer horse Maleic acid, 15% maleic anhydride-styrene sulfonate-acrylamide-alkyl allyl glyceryl ether (relative molecular weight is 3000), 17% 2-phosphonobutane-1,2,4-tricarboxylic acid, 8% ethylene glycol, and stirred for 45 minutes; finally the remaining 7.5% water was added and stirred for 35 minutes.

[0030] The scale inhibition performance test is the same as that in Example 1.

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Abstract

The invention relates to a scale inhibiting-dispersing agent for three-time-concentrated low-temperature multiple-effect seawater desalination and a preparation method thereof. The scale inhibiting-dispersing agent is characterized by being prepared from the following components in percentage by weight: 20 percent to 30 percent of polyacrylic acid, 5 percent to 10 percent of polymaleic acid, 10 percent to 20 percent of maleic anhydride-styrene sulfonate-acrylamide-alkylallyl glycerin ether, 10 percent to 20 percent of 2-phosphonobutane-1,2,4-tricarboxylic acid, 5 percent to 10 percent of ethylene glycol, 0.5 percent to 1 percent of thiourea and 20 percent to 30 percent of water. The scale inhibiting-dispersing agent provided by the invention is applicable to a three-time-concentrated low-temperature efficient seawater desalination system and has excellent inhibition effect and dispersion effect on calcium carbonate, calcium sulfate and the like; the raw materials of the scale inhibiting-dispersing agent provided by the invention are food-grade and the boiling point of the scale inhibiting-dispersing agent is higher than 120 DEG C and does not enter product water along the distillation of seawater; the product water can be used as drinking water and indexes are much better than standards of living drinking water.

Description

technical field [0001] The invention relates to the field of seawater desalination, and relates to a scale-inhibiting dispersant for triple-concentration low-temperature multi-effect seawater desalination and a preparation method thereof. Background technique [0002] Seawater desalination, as an alternative and incremental technology for freshwater resources, has received more and more attention, and has become a feasible solution and an important way to solve the global water crisis in the future. Therefore, developing seawater desalination technology and asking for fresh water from the sea is a common trend for all countries in the world to solve the water shortage problem. [0003] At present, the industrialization technologies of seawater desalination mainly include thermal method and membrane method, among which the thermal method is mainly concentrated in the Middle East, while the membrane method is mainly distributed in other regions. Thermal method, also known as ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F5/14C02F103/08
CPCC02F5/14C02F2103/08C02F2303/22
Inventor 杨文忠尹晓爽郭惠平刘学忠刘瑛张凤友陈云
Owner NANJING TECH UNIV