-
公开(公告)号：US4383123A
公开(公告)日：1983-05-10
申请号：US309623
申请日：1981-10-08
IPC分类号： B01J23/00 , C07B61/00 , C07C45/00 , C07C45/38 , C07C45/78 , C07C47/052 , C07C47/055 , C07C47/058 , C07C67/00
CPC分类号： C07C45/38 , C07C45/783
摘要： Formaldehyde manufacture by oxidative-dehydrogenation of methanol over a silver or copper catalyst. Aqueous formaldehyde solution is obtained from the reaction and is substantially stripped of methanol by a low energy process at relatively low temperature by means of recycled off-gas in a stripping column comprising at least about 1.5 theoretical transfer units for stripping methanol.
摘要翻译： 通过在银或铜催化剂上甲醇氧化脱氢制备甲醛。 从反应中获得甲醛水溶液，并通过在汽提塔中的再循环废气通过低能量过程在相对低的温度下基本上除去甲醇，所述汽提塔包含至少约1.5理论转移单元用于汽提甲醇。
-
2.发明授权Formaldehyde solutions stabilized with interpolymers of vinyl acetate, vinyl acetal and vinyl alcohol 失效用乙酸乙烯酯，乙烯醇缩醛和乙烯醇的互聚物稳定的甲醛溶液
公开(公告)号：US4085079A
公开(公告)日：1978-04-18
申请号：US764784
申请日：1977-02-02
申请人： Richard C. Kmetz , Leland P. Miner
发明人： Richard C. Kmetz , Leland P. Miner
IPC分类号： C07C45/86 , C07C47/058 , C07C47/04
CPC分类号： C07C45/86
摘要： A method of stabilizing concentrated aqueous formaldehyde solutions by the addition of a stabilizing amount of an interpolymer of vinyl acetate, vinyl acetal and vinyl alcohol to the formaldehyde solution. The interpolymer comprises from about 25 to about 65 parts by weight vinyl acetate units, from about 20 to about 72 parts by weight vinyl acetal units derived from acetaldehyde and from about 3 to about 15 parts by weight of vinyl alcohol units. The interpolymer is prepared by alcoholysis and acetalization of a low molecular weight polyvinyl acetate.
摘要翻译： 通过向甲醛溶液中加入稳定量的乙酸乙烯酯，乙烯醇缩醛和乙烯醇的互聚物来稳定浓缩甲醛水溶液的方法。 共聚体包含约25至约65重量份的乙酸乙烯酯单元，约20至约72重量份衍生自乙醛的乙烯基缩醛单元和约3至约15重量份的乙烯醇单元。 通过低分子量聚乙酸乙烯酯的醇解和缩醛制备互聚物。
-
公开(公告)号：US4454354A
公开(公告)日：1984-06-12
申请号：US404210
申请日：1982-08-02
IPC分类号： C07C47/052 , B01J23/00 , C07B61/00 , C07C29/80 , C07C45/00 , C07C45/38 , C07C45/78 , C07C45/82 , C07C47/055 , C07C67/00 , C07C45/29 , C07C47/04
CPC分类号： C07C45/783 , C07C29/80 , C07C45/38 , C07C45/82 , Y02P20/52
摘要： Formaldehyde manufacture by oxidative-dehydrogenation of methanol over a silver or copper catalyst. Aqueous formaldehyde solution is obtained from the reaction and is stripped of a mixture of methanol, formaldehyde and water by a low energy process at relatively low temperature and low reflux in a still comprising at least about 1.5 theoretical plates, the stripping conditions being selected to allow substantial reduction of the methanol content of the aqueous formaldehyde solution and recycle of the methanol to the reactor.
摘要翻译： 通过在银或铜催化剂上甲醇氧化脱氢制备甲醛。 从反应中获得甲醛水溶液，并在相对低的温度和低回流的低能量过程中汽提甲醇，甲醛和水的混合物，还包含至少约1.5理论塔板，选择剥离条件以允许 显着降低甲醛水溶液的甲醇含量并将甲醇循环到反应器中。
-
公开(公告)号：US4385188A
公开(公告)日：1983-05-24
申请号：US309960
申请日：1981-10-09
IPC分类号： C07C29/80 , C07C45/00 , C07C45/78 , C07C47/058 , C07C67/00
CPC分类号： C07C29/80 , C07C45/783
摘要： Aqueous formaldehyde solutions containing minor amounts of methanol are substantially stripped of methanol by a low energy process at relatively low temperature by means of recycled inert gas in a stripping column comprising at least about 1.5 theoretical transfer units for stripping methanol.
摘要翻译： 含有少量甲醇的甲醛水溶液通过在相对较低温度下的低能量过程通过在汽提塔中的再循环的惰性气体基本上除去甲醇，所述汽提塔包含至少约1.5理论的用于汽提甲醇的转移单元。
-
公开(公告)号：US4348540A
公开(公告)日：1982-09-07
申请号：US278811
申请日：1981-06-29
IPC分类号： B01D3/14 , B01D3/34 , B01J23/00 , C07B61/00 , C07C29/76 , C07C45/00 , C07C45/38 , C07C45/78 , C07C47/055 , C07C67/00 , B01D3/16 , C07C47/058
CPC分类号： C07C45/38 , B01D3/143 , B01D3/343 , C07C29/76 , C07C45/783 , Y02P20/52 , Y10S203/20
摘要： Formaldehyde manufacture by oxidative-dehydrogenation of methanol over a silver or copper catalyst. Aqueous formaldehyde solution is obtained from the reaction and is stripped of methanol and water by a low energy process at relatively low temperature by means of recycled inert gas in a stripping column comprising at least about 1.5 theoretical transfer units for stripping methanol.
摘要翻译： 通过在银或铜催化剂上甲醇氧化脱氢制备甲醛。 从反应中获得甲醛水溶液，并通过在汽提塔中的回收惰性气体在低温下通过低能量方法汽提甲醇和水，该汽提塔包含至少约1.5理论转移单元以用于汽提甲醇。
-
-
-
-
搜索结果
5 条记录 (耗时 0.011 秒)
