in water treatment, the commonly used scale inhibitors are polyphosphate, organic phosphonic acid, phosphonic acid, organic phosphonic acid, polycarboxylic acid, etc..
1) polyphosphate
commonly used phosphates are sodium tripolyphosphate and six sodium hexametaphosphate. the addition of trace amounts of polyphosphate to water destroys the normal growth of crystals such as calcium carbonate, thereby preventing formation of calcium carbonate scale. it is a common method for preventing scale in the early urban water distribution system or dc cooling system. polyphosphate, which is readily decomposed to form orthophosphate, can promote the growth of bacteria and algae. thus, the use of polyphosphate alone has been phased out and replaced by phosphate compounds. [1]
2) organic phosphonic acid scale inhibitor
commonly used are atmp, hedp, edtmps, dtpmpa, pbtca, bhmt and so on. it has a good effect on inhibiting the precipitation or precipitation of calcium carbonate, hydrated iron oxide or calcium sulfate.
organic phosphine carboxylic acid molecule containing phosphonic acid group and carboxyl group two. at present, pbtca is used more frequently in actual use. its chemical name is 2- based -1,2 butane phosphonic carboxylic acid a, water quality conditions of 4- three pbtca in high temperature, high hardness and high ph value than has better scale inhibition performance of organic phosphonic acid, compared with organic phosphonic acid, pbtca is not easy to form organic phosphonic acid insoluble calcium, and it has a corrosion inhibitor performance, especially in high doses, is an efficient inhibitor. the synergistic effect of pbtca with zinc salt and polyphosphate can produce good synergistic effect.
3) organic phosphonate
the effect of organic phosphonate on calcium sulfate scale inhibition is better, but the effect of inhibiting calcium carbonate scale is poor. although it is difficult to hydrolyze than polyphosphate, it is easy to hydrolyze and produce phosphoric acid. organophosphorus esters are very toxic to aquatic organisms, and their slow hydrolysis products are biodegradable and therefore have little impact on the environment. it is commonly used in combination with polyphosphate, zinc salt, lignin, and benzotriazole three.
4) polycarboxylic acid scale inhibitor and dispersant
polycarboxylic acid compounds have a good scale inhibition effect on calcium carbonate scale, and the dosage is very little. commonly used polyacrylic acid paa, hydrolysis maleic anhydride, hpma, aa/amps, copolymer and so on.
mainly used in various industries of water coolers, oil coolers, condensers, air coolers, evaporators, radiators, reactors, absorption towers, storage tanks, pipelines and other equipment corrosion and scale inhibition.
performance characteristics:
at the same time it has excellent temperature resistance (long-term working temperature less than 150 deg c, water medium), resistant to corrosive medium properties such as industrial water. [characteristics] density: 1.00-1.20 activity concentration: >1.5%
[instructions] when sterilizing the cooling water system, add the concentration of 50-80ppm, add frequency 1 times / week, and use alternately with hd-650. ensure uniform distribution in the system.

latest news

contact us

company: zouping dongfang chemical industry co., ltd.

tel: 0543-4501076

fax: 0543-4502242


add: haosheng town,zouping county,shandong,china

scan the qr code