Process for the manufacture of acrylic acid esters
专利汇可以提供Process for the manufacture of acrylic acid esters专利检索，专利查询，专利分析的服务。并且Improved process permitting heterogeneous catalytic reactions to be carried out continuously in liquid phase, wherein a suspension of liquid starting material and fine particulate catalyst together with resulting reaction product is continuously conveyed upwardly in a reaction zone, in accordance with the principle underlying an airlift pump, by the introduction of a gas into, near the bottom of, the reaction zone, and recycled downwardly through a by-pass reflux line to the bottom of the reaction zone, the recycled liquid material passing through an injector system interrupting its flow, the said system being situated in the bypass reflux line in a closed catalyst-separating zone containing reaction product; wherein, following establishment of the reaction equilibrium, starting material is continuously supplied to the reaction zone and crude, catalyst-free reaction product is removed near the head of the catalyst-separating zone; wherein reaction product, which is to be removed from the catalystseparating zone, is caused to flow upwardly through the catalystseparating zone with the injector system therein towards the reaction product outlet at velocity smaller than the sedimentation velocity of the catalyst in the catalyst-separating zone under the operational conditions prevailing. The improved process is more particularly used for esterifying arcylic acid in contact with an acid ion exchanger as a catalyst, at elevated temperature and under pressures substantially between 0.01 and 1 atmosphere absolute. To this end, the reaction zone is continuously supplied with a starting mixture of acrylic acid and an alkanol having between 4 and 6 carbon atoms; an inert gas is introduced into, near the bottom of, the reaction zone; the resulting suspension is heated to boiling; an azeotropic mixture of water originating from the esterification, alkanol and/or ester, is distilled off in a distillation zone placed directly above the head of the reaction zone; the azeotropic mixture is condensed and separated into a specifically lighter, predominantly organic phase and into a specifically heavier, predominantly aqueous phase, the organic phase being recycled to the head of the distillation zone and/or to the reaction zone; and resulting crude alkyl acrylate is removed near the head of the catalyst-separating zone.，下面是Process for the manufacture of acrylic acid esters专利的具体信息内容。
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