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Process for the Removal of Unreacted Ammonia in the Production of Acrylonitrile

机译:丙烯腈生产中未反应氨的去除方法

摘要

1,199,697. Removal of ammonia in the production of acrylonitrile. NITTO CHEMICAL INDUSTRY CO. Ltd. 7 Nov., 1968 [13 Nov., 1967], No. 52840/68. Heading C2C. [Also in Division C1] Unreacted ammonia is removed from the gaseous product resulting from the reaction producing acrylonitrile, which comprises contacting a gaseous phase mixture of ammonia, molecular oxygen and propylene with a catalyst at an elevated temperature, by cooling the resulting reaction product gas in at least two stages by direct contact with quenching water while adding an acid to the first cooling stage in an amount sufficient to neutralize substantially all the unreacted ammonia while maintaining the temperature of the effluent gas from the first cooling stage at a level to condense a minor portion of the water contained in the reaction product gas, thereby recovering the unreacted ammonia in the form of a salt solution of at least 10% by wt. concentration, and condensing the major portion of the water contained in the reaction product gas in the subsequent cooling stages. A small amount of the acid, e.g. a mineral acid such as sulphuric acid, may also be added in the subsequent cooling stages; the concentration of the ammonium salt formed by the neutralization and contained in the liquor withdrawn from the first cooling stage is suitably in the range 15-40% by wt.
机译:1,199,697。除去丙烯腈生产中的氨。 NITTO CHEMICAL INDUSTRY CO。Ltd.,1968年11月7日[1967年11月13日],第52840/68号。标题C2C。 [也在C1区中]从反应产生的丙烯腈的气态产物中除去未反应的氨,该反应包括通过冷却所得的反应产物气使氨,分子氧和丙烯的气相混合物与催化剂在高温下接触。在至少两个阶段中,通过与骤冷水直接接触,同时向第一冷却阶段中添加酸的量,该酸的量足以中和基本上所有未反应的氨,同时将来自第一冷却阶段的废气的温度保持在一定水平以冷凝水。反应产物气体中所含水的一小部分,从而以至少10重量%的盐溶液的形式回收未反应的氨。浓缩,并在随后的冷却步骤中冷凝反应产物气体中所含的大部分水。少量的酸,例如在随后的冷却步骤中也可以加入无机酸,例如硫酸。由中和形成的并包含在从第一冷却阶段排出的液体中的铵盐的浓度合适地为15-40重量%。

著录项

  • 公开/公告号GB1199697A

    专利类型

  • 公开/公告日1970-07-22

    原文格式PDF

  • 申请/专利权人 NITTO CHEMICAL INDUSTRY CO. LTD.;

    申请/专利号GB19680052840

  • 发明设计人

    申请日1968-11-07

  • 分类号C01C1/12;C01C1/24;C01C1/242;

  • 国家 GB

  • 入库时间 2022-08-23 10:31:08

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