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公开(公告)号：US4455439A
公开(公告)日：1984-06-19
申请号：US327510
申请日：1981-12-04
申请人： Dieter Arnold , Jorg Bartels , Heinrich Lenzmann , Gunter Jacobsen , Heinz Wendt , Manfred Stoltenberg
发明人： Dieter Arnold , Jorg Bartels , Heinrich Lenzmann , Gunter Jacobsen , Heinz Wendt , Manfred Stoltenberg
摘要： In this process for the preparation of ketene by the thermal, catalytic cracking of acetic acid under reduced pressure, the hot cracked gases are cooled to approx. 0.degree. to -10.degree. C. and, in the course thereof, water, unreacted acetic acid and acetic anhydride are condensed. The quantity of acetic acid employed for the thermal cracking reaction should be 0.5 to 2.5 t.times.hours.sup.-1 .times.m.sup.-3, relative to the volume V of a shell-and-tube heat exchanger through which the cracked gas is passed. The pressure drop in the tubular heat exchanger should be 50 to 150 mbars and the surface/volume ratio should be 60 to 120 m.sup.-1.
摘要翻译： 在该方法中，通过在减压下热乙酸催化裂化制备乙烯酮，将热裂解气体冷却至约 0℃至-10℃，并且在其过程中，将水，未反应的乙酸和乙酸酐缩合。 用于热裂解反应的乙酸的量相对于裂化气体通过的管壳式热交换器的体积V为0.5〜2.5×t×1〜1mm -3。 管式热交换器的压降应为50至150 mbars，表面/体积比应为60至120 m-1。
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公开(公告)号：US4001332A
公开(公告)日：1977-01-04
申请号：US639110
申请日：1975-12-09
申请人： Gunter Mau , Gunter Jacobsen , Erich Brandes
发明人： Gunter Mau , Gunter Jacobsen , Erich Brandes
CPC分类号： C07C45/90
摘要： Ketene is compressed by means of a liquid ring pump using ketene-containing diketene as operating liquid.
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公开(公告)号：US3935274A
公开(公告)日：1976-01-27
申请号：US817961
申请日：1969-04-21
CPC分类号： C07C45/75
摘要： Process for the continuous preparation of hydroxypivalaldehyde by the reaction of isobutyraldehyde with aqueous formaldehyde in a cascade of stirred vessels in the presence of an alcohol and of an alkali metal hydroxide as a catalyst.
摘要翻译： 通过在醇和碱金属氢氧化物作为催化剂的存在下，在搅拌容器的级联中通过异丁醛与甲醛水溶液的反应连续制备羟基新戊醛的方法。
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