The first scale inhibitor borrowed is sodium hexametaphosphate (SHMP).
In the late 1980s, many new special scale inhibitors for reverse osmosis appeared in foreign markets, such as Flocon 100 from Pfizer, AF- 100 from BFGoodrich and EL-5600 from Calgon. These new special scale inhibitors for reverse osmosis can be used in a wide pH range of water supply, and are non-corrosive and safe to operate compared with acids. Compared with SHMP, it is not easy to decompose and has a long storage period. For the purpose of competition, the formulations and components of these new special scale inhibitors for reverse osmosis are often kept secret by their manufacturers and sellers, and most of them are patented formulations. Its formula belongs to the trade secrets of manufacturers and sellers. According to the articles published at home and abroad on reverse osmosis scale inhibitors, there is no mention of the types and formulas of special scale inhibitors for reverse osmosis. The huge economic benefits brought by the special scale inhibitor for reverse osmosis make the developers and producers of reverse osmosis scale inhibitor highly confidential, unlike the scale inhibitors used in boiler water and circulating cooling water industries, which also brings difficulties to the research of the special scale inhibitor for reverse osmosis and has no reference basis.
The development of scale inhibitor itself (in terms of boiler water and circulating cooling water industry) has gone through several stages: inorganic polyphosphate-organic phosphoric acid (salt)-polycarboxylic acid-binary and ternary phosphorus-containing polymers-binary and ternary phosphorus-free polymers, and phosphorus-free scale inhibitor will be the future development direction. With the rapid development of low-phosphorus and non-phosphorus formula, low-phosphorus and non-phosphorus green water treatment agent has become a hot spot in the development of water treatment agent at home and abroad.
In order to make the special scale inhibitor for reverse osmosis conform to the current development direction, the synthesis of new scale inhibitors, namely polyaspartic acid (PASP) and polyoxysuccinic acid (PESA), which are phosphorus-free, biodegradable and environment-friendly, was studied and industrialized. The study of its performance shows that it can effectively control CaCO3, CaSO4, BaSO4, SrSO4CaF2, SiO2 and other scales at the same time, and has good stability to calcium ion concentration, alkalinity, oxidizing disinfectant chlorine dioxide and metal ions such as iron and manganese. A series of special scale inhibitors TJRO 10 1, TJRO 102 and TJRO 103 were developed by compounding PESA and PASP with other scale inhibitors. They can be used in a wide pH range of water supply, and are non-corrosive and safe to operate compared with acids. Compared with SHMP, it is not easy to decompose and has a long storage period. RO 10 1, TJRO 102 and TJRO 103 are special scale inhibitors for reverse osmosis, which are in line with the development direction of green water treatment agents and belong to low-phosphorus and non-phosphorus green environmental protection formulations. It can effectively control and prevent CaCO3, CaSO4, BaSO4, SrSO4, CaF2 _ 2 and SiO2 _ 2 from scaling at the same time; Compatibility with reverse osmosis membrane; The function is far superior to the traditional reverse osmosis scale inhibitor SHMP, and it is close to or even exceeds the function of imported scale inhibitor (such as PTP2000); American LeeKing Company). And the price is competitive.