Process for the manufacture of acetic anhydride
Номер патента: GB369283A
Опубликовано: 24-03-1932
Автор(ы):
Принадлежит: Boehringer Mannheim GmbH, C F Boehringer & Soehne GmbH
Опубликовано: 24-03-1932
Автор(ы):
Принадлежит: Boehringer Mannheim GmbH, C F Boehringer & Soehne GmbH
Реферат: Catalysts for the production of acetic anhydride from acetic acid are made by treating asbestos or like silicate such as leucite or analeine with acid so as to leave a skeleton of silica. The silica skeleton may be used as a support for other catalysts such as metals or charcoal which thereby acquire the same advantageous surface formation as the silica. In an example, serpentine asbestos or chrysotile is treated with hydrochloric acid so as to remove all the iron and all or most of the magnesia ; the asbestos may be first woven into net or cloth, or, if it is to be used in the form of pressed sheets or plates or the like, the acid treatment may be effected after the formation of the sheets. Platinum or carbon may be deposited on the silica skeleton. In the case of carbon, the silica may be impregnated with sugar solution, and ignited with exclusion of air. Specifications 344,482 and 362,462 are referred to.ALSO:Acetic anhydride is prepared by passing the vapour of acetic acid over a catalyst made by treating asbestos or like silicate such as leucite or analcime with acid so as to leave a skeleton of silica. The silica skeleton may be used as a support for other catalysts such as metals or charcoal which thereby acquire the same advantageous surface formation as the silica. In an example, serpentine asbestos or chrysotile is treated with hydrochloric acid so as to remove all the iron and all or most of the magnesia; the asbestos may be first woven into net or cloth or, if it is to be used in the form of pressed sheets, plates or the like, the acid treatment may be affected after the formation of the sheets. Platinum or carbon may be deposited on the silica skeleton. In the case of carbon, the silica may be impregnated with sugar solution and ignited with exclusion of air. Specifications 344,482 and 362,462 are referred to.
Process for the preparation and recovery of acetic anhydride
Номер патента: US3590081A. Автор: Shinichi Ishida,Kunio Sato,Toshiaki Yamazaki,Noboru Ohshima. Владелец: Asahi Chemical Industry Co Ltd. Дата публикации: 1971-06-29.