REGENERATION OF ION EXCHANGE RESIN
PURPOSE:To enhance regeneration efficiency, in the regeneration of a basic anion exchange resin used in the purification of methacrylic acid, by substituting a resin bed with an org. solvent for extracting methacrylic acid and subsequently substituting the same with a hydrophilic solvent to wash the...
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| creator | SEGAWA HIROZO IWASAKI KOZO SEZAKI YOSHIHIRO YOGUCHI KATSUJI KURAGANO MORIMASA |
| description | PURPOSE:To enhance regeneration efficiency, in the regeneration of a basic anion exchange resin used in the purification of methacrylic acid, by substituting a resin bed with an org. solvent for extracting methacrylic acid and subsequently substituting the same with a hydrophilic solvent to wash the resin. CONSTITUTION:A methacrylic acid-containing extractant held at predetermined temp. is allowed to pass through a column packed with a basic anion exchange resin at a constant flow speed to obtain methacrylic acid containing no maleic acid and citraconic acid of a limit of detection. When the anion exchange resin reaches a breakpoint, the passage of the extractant is stopped and the residual liquid in the column is washed an substituted with an org. solvent for extracting methacrylic acid and subsequently substituted and washed with a hydrophilic solvent such as acetone or methanol and further sufficiently washed with water. Thereafter, when alkali regeneration treatment is performed using an about 5wt% aqueous caustic soda solution, the alkali regeneration efficiency of the anion exchange resin is markedly enhanced. |
| format | Patent |
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CONSTITUTION:A methacrylic acid-containing extractant held at predetermined temp. is allowed to pass through a column packed with a basic anion exchange resin at a constant flow speed to obtain methacrylic acid containing no maleic acid and citraconic acid of a limit of detection. When the anion exchange resin reaches a breakpoint, the passage of the extractant is stopped and the residual liquid in the column is washed an substituted with an org. solvent for extracting methacrylic acid and subsequently substituted and washed with a hydrophilic solvent such as acetone or methanol and further sufficiently washed with water. 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CONSTITUTION:A methacrylic acid-containing extractant held at predetermined temp. is allowed to pass through a column packed with a basic anion exchange resin at a constant flow speed to obtain methacrylic acid containing no maleic acid and citraconic acid of a limit of detection. When the anion exchange resin reaches a breakpoint, the passage of the extractant is stopped and the residual liquid in the column is washed an substituted with an org. solvent for extracting methacrylic acid and subsequently substituted and washed with a hydrophilic solvent such as acetone or methanol and further sufficiently washed with water. Thereafter, when alkali regeneration treatment is performed using an about 5wt% aqueous caustic soda solution, the alkali regeneration efficiency of the anion exchange resin is markedly enhanced.</abstract><oa>free_for_read</oa></addata></record> |
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| subjects | ACYCLIC OR CARBOCYCLIC COMPOUNDS CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY CHEMISTRY METALLURGY ORGANIC CHEMISTRY PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL SEPARATION THEIR RELEVANT APPARATUS TRANSPORTING |
| title | REGENERATION OF ION EXCHANGE RESIN |
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