Weakly basic epoxy anion exchange resin

Weakly basic epoxy anion exchange resin

The domestic names used to be 331, 330, and 701

[Structural formula]

[Physical and chemical properties] White to golden yellow spherical particles, water content 55%-65%, wet true density 1.

[Preparation]

(1) Polyethylene polyamine (such as tetraethylene pentamine or pentaethylene hexaamine ) and epichlorohydrin are polycondensed

① Preparation of the pre-shrinked product.

②Suspension polycondensation: mix 132.

③After treatment, the solidified resin is pumped into the drying equipment, rinsed with gasoline 120kg, divided into four times, filtered out the gasoline, dried at 50℃, discharged, sieved, sieved 10-50mg particles, acid-base treatment, The product is obtained after washing and draining

The process flow is shown in Figure 9-9

Figure 9-9 Preparation process of weakly basic epoxy anion exchange resin

(2) When epichlorohydrin is used to react with polyvinyl polyamine, after amination and ring opening are gradually copolymerized and reacted, the polyamino anion exchange resin is directly obtained without generating or obtaining low molecular weight

One-step ball forming method: mix 910 parts of chlorobenzene, 1080 parts of dichlorobenzene and 20 parts of cis-poly 1,4-butadiene uniformly, and slowly add and dissolve in 264 parts of water under stirring at a temperature of 20-30°C Add 313 parts of epichlorohydrin dropwise to 205 parts of polyvinyl polyamine, control the temperature at 30°C, and gradually increase the temperature and stir for 6-8h to 100°C

(3) Another preparation method is as follows

①Pre-polymerized polyvinyl polyamine and epichlorohydrin into a slurry, and then suspended polymerization to complete the polycondensation reaction

Take 189 parts of tetraethylenepentamine, dissolve it in 366 parts of deionized water, control the temperature at 28-30℃, drip 277 parts of epichlorohydrin within 0.

②Add 5 parts of polystyrene to 30 parts of o-dichlorobenzene, add 98 parts of o-dichlorobenzene and 96 parts of xylene after dissolution, stir and mix well

③Tertiary amination reaction: the above resin is first soaked in formic acid and then added to a three-necked flask, then formaldehyde is added and refluxed for 12 hours to obtain a tertiary amination resin

[Application] is mainly used in water treatment to remove CI ^- , SO _.

Related Links: Macroporous Weakly Basic Acrylic Anion Exchange Resin