Processo para a preparação contínua de ésteres alquílicos de ácido (met) acrílico
In the continuous production of alkyl (meth)acrylates (AA) by reacting (meth)acrylic acid with 1-8 carbon (C) monohydric alkanols in the presence of an acid esterification catalyst; (a) a product mixture (PM) containing AA, the catalyst and a by-product (BP) with a higher b.pt. than AA is discharged...
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| creator | HEINRICH AICHINGER HERBERT EXNER GABRIELE IFFLAND MATTHIAS GEISENDORFER GERHARD NESTLER TONI DOCKNER HOLGER HERBST WILLI SCHMIDT ALBRECHT DAMS ALEXANDER WECK |
| description | In the continuous production of alkyl (meth)acrylates (AA) by reacting (meth)acrylic acid with 1-8 carbon (C) monohydric alkanols in the presence of an acid esterification catalyst; (a) a product mixture (PM) containing AA, the catalyst and a by-product (BP) with a higher b.pt. than AA is discharged from the reaction zone; and (b) AA is separated from PM by distillation in a separation zone. The novel features are that PM is separated in a rectification unit (RU) I into at least a product (I) containing AA and a product (II) containing the catalyst and product (I) is passed to another RU II, where AA is separated by rectification. Preferably the alkanol is 4-8 C alkanol, especially n-butanol or 2-ethylhexanol is used. The catalyst is para-toluene sulphonic acid (p-TSA) and/or other organic sulphonic acids, e.g. methane-, benzene- or dodecylbenzene-sulphonic acid, and/or sulphuric acid (H2SO4). The catalyst concentration in the reaction mixture is 0.1-10, especially 0.1-6 wt.% p-TSA or an equimolar amount of organic sulphonic acid and/or H2SO4. |
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The novel features are that PM is separated in a rectification unit (RU) I into at least a product (I) containing AA and a product (II) containing the catalyst and product (I) is passed to another RU II, where AA is separated by rectification. Preferably the alkanol is 4-8 C alkanol, especially n-butanol or 2-ethylhexanol is used. The catalyst is para-toluene sulphonic acid (p-TSA) and/or other organic sulphonic acids, e.g. methane-, benzene- or dodecylbenzene-sulphonic acid, and/or sulphuric acid (H2SO4). 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The novel features are that PM is separated in a rectification unit (RU) I into at least a product (I) containing AA and a product (II) containing the catalyst and product (I) is passed to another RU II, where AA is separated by rectification. Preferably the alkanol is 4-8 C alkanol, especially n-butanol or 2-ethylhexanol is used. The catalyst is para-toluene sulphonic acid (p-TSA) and/or other organic sulphonic acids, e.g. methane-, benzene- or dodecylbenzene-sulphonic acid, and/or sulphuric acid (H2SO4). The catalyst concentration in the reaction mixture is 0.1-10, especially 0.1-6 wt.% p-TSA or an equimolar amount of organic sulphonic acid and/or H2SO4.</abstract><edition>6</edition><oa>free_for_read</oa></addata></record> |
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| subjects | ACYCLIC OR CARBOCYCLIC COMPOUNDS APPARATUS THEREFOR CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY CHEMISTRY GENERAL METHODS OF ORGANIC CHEMISTRY METALLURGY ORGANIC CHEMISTRY PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL THEIR RELEVANT APPARATUS TRANSPORTING |
| title | Processo para a preparação contínua de ésteres alquílicos de ácido (met) acrílico |
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