Acrylic acid, water-absorbent polymer structures based on renewable resources and method for producing said structures
A technology of water-absorbing polymers, acrylic, applied in a manufacturing area that can solve the problems of increased waste volume, limited comfort, more dumping space or burning expenses
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Embodiment 1
[0128] Dehydration in the gas phase of embodiment 1
[0129] figure 2 In the described gas-phase dehydration device (the part in the dotted line), the catalyst is located in the reactor zone 9, and 100 parts by weight of Rosenthal balls (α-Al 2 o 3 ) was mixed with 25 parts by weight of 20wt.% phosphoric acid for 1 hour, and then the excess water (H 0 Values are -5.6 to -3) to obtain the catalyst. Glycerol evaporated in the evaporator at 295° C. was transported in 100 ml of the catalyst at 270° C. in a steel pipe in the reaction zone as a 20 wt. % aqueous solution with a 40 ml / h pump. The reaction mixture containing acrolein is contacted with water as a quencher in a quencher, and the resulting aqueous mixture is introduced into a conventional reactor for gas-phase oxidation of acrolein to acrylic acid for gas-phase oxidation.
Embodiment 2
[0130] Embodiment 2: liquid phase dehydration
[0131] exist image 3 In the device, the catalyst described in Example 1 is used for liquid phase dehydration (the part in the dotted line), wherein the Rosenthal balls (H 0 The value is 2~-3). The reaction temperature was 240°C. Water was used as a quencher. The acrolein synthesis is followed by gas-phase oxidation in a conventional gas-phase oxidation reactor, as in Example 1, followed by absorption by water in a quench unit.
[0132] The acrylic acid-water mixture obtained in Examples 1 and 2 was combined with 0.5 parts by volume of toluene in a glass separation funnel, and the temperature was controlled at 0°C. The mixture was shaken well and allowed to stand for 60 minutes to separate the phases. Two phases were separated. The toluene-containing phase was azeotropically distilled and the resulting acrylic acid was distilled before it was used in the polymerization.
[0133] Gas chromatography cannot identify the imp...
Embodiment 3
[0134] Example 3: Polymerization
[0135] Dissolved oxygen was removed from a monomer solution consisting of 280 g of the above-obtained acrylic acid prepared with sodium hydroxide, 466.8 g of water, 1.4 g of polyethylene glycol-300-diacrylate and 1.68 g of allyloxypolyethylene diacrylate. The alcohol acrylate was neutralized to 70 mol.% by bubbling nitrogen, and the monomer solution was cooled to an initial temperature of 4°C. After reaching the starting temperature, add the initiator solution (in 10g H 2 0.1 g of 2,2'-azobis-2-amidinopropane dihydrochloride (2,2'-azobis-2-amidinpropanedihydrochloride) in 10 g H 2 0.3 g of sodium persulfate in O, in 1 g of H 2 0.07 g of 30% hydrogen peroxide solution in O, and in 2 g of H 2 0.015g of ascorbic acid in O). After the final temperature had reached approximately 100°C, the formed gel was crushed and dried at 150°C for 90 minutes. The dried polymer is roughly chopped, ground, and sieved to obtain a powder with a size of 150-...
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Abstract
Description
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