Process for macroporous acrylic resins
A technology of resin beads and hole cores, applied in fractionation and other directions, can solve problems such as low efficiency
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Embodiment 1
[0031] Example 1: Standard procedure including washing
[0032] A mixture of 178.1 grams of methyl acrylate, 41.9 grams of divinylbenzene (63% active ingredient), 180.0 grams of toluene and 2.82 grams of benzoyl peroxide (78% active ingredient) was added to a tank containing 0.60 grams of methyl hydroxyethyl Base cellulose, 3.60 g boric acid, 1.8 g 50% sodium hydroxide and 594.0 g deionized water in a 2 L round bottom flask. The pH of the aqueous solution was adjusted to 9 with a small amount of additional boric acid and sodium hydroxide. The mixture was stirred until a stable dispersion of organic droplets formed in the aqueous phase, and the mixture was heated at 70° C. for 8 hours.
[0033] The resulting copolymer beads and reaction mixture were then divided into two equal portions and each portion was distilled at 90-100°C to remove the toluene porogen from the beads. Distillation was continued until no more toluene was received in the distillate receiver. The recoverie...
Embodiment 2
[0035] Example 2: Standard procedure without washing
[0036] The second batch of Example 1 was then returned to the reactor without washing and caustic hydrolysis was performed as described in that Example. After hydrolysis the resin was washed and converted to the hydrogen form using 10% sulfuric acid. The percent volume change (decrease) of the resin from the sodium form to the hydrogen form was 55% by volume. The moisture holding capacity (MHC) of the obtained resin was 59.9%, and its weight capacity and volume capacity were 10.08 eq / kg and 2.90 eq / L, respectively.
Embodiment 3
[0037] Embodiment 3: low temperature hydrolysis stripping (hydrostrip)
[0038]A mixture of 178.1 grams of methyl acrylate, 41.9 grams of divinylbenzene (63% active ingredient), 180.0 grams of toluene and 2.82 grams of benzoyl peroxide (78% active ingredient) was added to a tank containing 0.60 grams of methyl hydroxyethyl Base cellulose, 3.60 g boric acid, 1.8 g 50% sodium hydroxide and 594.0 g deionized water in a 2 L round bottom flask. The pH of the aqueous solution was adjusted to 9 with a small amount of additional boric acid and sodium hydroxide. The mixture was stirred until a stable dispersion of organic droplets formed in the aqueous phase, and the mixture was heated at 70° C. for 8 hours. The resulting copolymer beads and reaction mixture were then equally divided in two.
[0039] The first batch was immediately hydrolyzed with 327.4 grams of 50% sodium hydroxide without first removing the porogen from the resin by a distillation step. The reaction mixture was he...
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