Scale inhibitor of reverse osmosis membranes

Abstract

The invention discloses a scale inhibitor of reverse osmosis membranes and relates to the field of chemical processes. The composition is prepared from polyepoxysuccinic acid, sodium polystyrene sulfonate, poly aspartic acid, polylactic acid, dimethyldistearylammonium bromide, benzisothiazolones and deionized water. The phosphate-free scale inhibitor of reverse osmosis membranes is capable of efficiently removing inorganic scales and colloid scales deposited on reverse osmosis membranes; in the formula, several phosphate-free or low-phosphate environment-friendly materials are used in combination, the use effect of the composite agent is greatly improved through the synergistic effect among the raw materials, and satisfactory comprehensive scale removing performance is achieved; meanwhile, by means of the phosphate-free formula and addition of a small amount of the green fungicide benzisothiazolones, the potential danger of biological pollution and bacterium standard exceeding of membrane systems can be relieved, and pollution to the environment water source is avoided.

Description

technical field [0001] The invention relates to the field of chemical technology, in particular to a reverse osmosis membrane scale inhibitor. Background technique [0002] The large-scale application of membrane separation technology began in the seawater desalination project in the 1960s. The reverse osmosis method has the advantages of small footprint, low operating cost, no secondary pollution, stable water output, and high degree of automation. The technical field has gradually replaced the ion exchange method and has become the main technology for pure water preparation. At present, it is not only used in large-scale desalination of seawater, brackish water, pure water, ultrapure water production, and sewage reuse, but also used in the food industry. , pharmaceutical industry, bioengineering and other fields. Reverse osmosis technology is a reverse osmosis process that applies external driving force to salt water to overcome the osmotic pressure so that water molecule...

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Problems solved by technology

[0004] In recent years, organic phosphoric acid reverse osmosis membrane antiscalants have developed extremely rapidly. They can be used in a wide pH range of feed water, and have good stability to calcium ion concentration, alkalinity, and metal ions such as iron and manganese. , can effectively control CaCO 3 , CaSO 4 , BaSO 4 , SrSO 4 The formation of other scales, but phosphorus is a nutrient source for bacteria and algae, and phosphorus-containing antiscalants will provide the bacteria and microorganisms in water pipes and reverse osmosis membrane systems with phosphorus-containing nutrients needed for growth, resulting in the existence of membrane systems Hidden dangers of biological pollution and bacteria exceeding the standard. With the enhancement of people's environmental protection awareness, the market demand for low-phosphorus and phosphorus-free scale inhibitors is increasing. However, common scale inhibitors are generally used due to their mediocre effect, resulting in large usage and high cost.

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