Seawater desalination de-foaming agent as well as preparation method and application thereof

Abstract

The invention relates to a seawater desalination de-foaming agent as well as a preparation method and application thereof. The de-foaming agent is prepared from silicon paste, polyether modified organic silicon, an emulsifier, a thickening agent and water, wherein the mass percent of the silicon paste is 5 to 20 percent, the mass percent of the polyether modified organic silicon is 10 to 30 percent, the mass percent of the emulsifier is 2 to 10 percent and the mass percent of the thickening agent is 0.5 to 2 percent. The preparation method comprises the following steps: (1) weighing the silicon paste, the polyether modified organic silicon and the emulsifier according to the mass percent and mixing at 70 to 80 DEG C to obtain a mixture; (2) preparing the thickening agent into a water solution; (3) injecting 1 / 3 or less of the thickening agent water solution into the mixture of step (1); after uniformly mixing, adding the residual thickening agent water solution in batches to obtain thede-foaming agent. The de-foaming agent provided by the invention has the characteristics of high stability, rapid de-foaming speed, good foam inhibition performance, good compatibility with a scale inhibitor and the like and has good environment-friendly performance and a wide application prospect.

Description

technical field [0001] The invention relates to the field of defoamers, in particular to a seawater desalination defoamer and its preparation method and application. Background technique [0002] Seawater usually contains a lot of organic matter, and it is easy to generate foam under the working conditions of low-temperature multi-effect seawater desalination. If no measures are taken to suppress it, it will lead to unstable control of the seawater level and affect the normal operation of the device. During the actual operation of the low-temperature multi-effect seawater desalination plant, the way of adding defoamer is usually used to control the formation of foam. [0003] Although oil defoamers are cheap, they have poor antifoaming ability, low defoaming rate, are not easy to disperse in the water phase, and have narrow application areas, so they have been gradually eliminated by the market; polyether defoamers have good water solubility, Strong antifoaming ability, but...

AI Technical Summary

Problems solved by technology

[0003] Although oil defoamers are cheap, they have poor antifoaming ability, low defoaming rate, are not easy to disperse in the water phase, and have narrow application areas, so they have been gradually eliminated by the market; polyether defoamers have good water solubility, Strong antifoaming ability, but low foam breaking rate, once a large amount of foam is generated, it cannot be effectively eliminated at once, and the cost of use is high; silicone defoamer is a kind of defoaming agent with low toxicity and strong foam breaking ability However, due to its poor water solubility, its use in water systems is limited; with the development of defoamers, those low-grade defoamers with a single component structure and poor economic benefits will gradually be replaced by multifunctional , high-efficiency compound open-type defoamer to replace, the development of compound defoamer with strong applicability, less dosage and high stability is the current development trend of the industry

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