2. C 105, weakly acidic acrylic resin, with high exchange capacity, can remove temporary hardness and alkalinity and provide E-pole products.
3. C 106, macroporous weakly acidic acrylic resin, with excellent impact resistance, is specially used for ammoniation condensate and antibiotic fixation.
4.C 107E, macroporous weakly acidic acrylic resin, specially designed for household small barrel heat exchangers.
5. C 1 15E, weakly acidic methacrylic resin, suitable for special use (pharmaceutical, antibiotic fixation) and Carix process.
(3) Strongly basic anionic resin
This kind of resin contains strongly basic groups, such as quaternary amino group (also called quaternary amino group) -NR3OH (R is hydrocarbon group), which can dissociate OH- from water and is strongly basic. This resin is highly decomposable and can work normally at different pH values. Regenerate with strong alkali (such as NaOH).
(4) weakly basic anionic resin
This kind of resin contains weakly basic groups, such as primary amino (also called primary amino) -NH2, secondary amino (secondary amino) -NHR, or tertiary amino (tertiary amino) -NR2, which can dissociate OH- in water and become weakly basic. Cationic groups of this resin can be adsorbed and combined with anions in solution, thus generating anion exchange. In most cases, this resin absorbs all other acid molecules in the solution. It can only work under neutral or acidic conditions (such as pH 1 ~ 9). It can be regenerated by Na2CO3 and NH4OH.
(5) Transformation of ionic resin
The above are the four basic types of resins. In practical use, these resins are often converted into other ion types to meet various needs. For example, strongly acidic cationic resins often react with NaCl and are converted into sodium resins for reuse. During operation, Na+ released from sodium resin exchanges and adsorbs with Ca2+, Mg2+ and other cations in the solution, and these ions are removed. H+ is not released during the reaction, which can avoid the decrease of pH value of the solution and the resulting side effects (such as sucrose conversion and equipment corrosion). After this resin is used in the form of sodium, it can be regenerated with brine (no strong acid). Another example is that anion resin can be converted into chlorine type for reuse, and Cl- is released when working, and other anions are adsorbed and exchanged, and its regeneration only needs saline solution. Chlorine resin can also be converted into bicarbonate (HCO 3-). Strong acid resin and strong base resin will no longer have strong acid and strong base after being converted into sodium type and chlorine type, but they still have other typical properties of these resins, such as strong dissociation and wide working pH range.