公开(公告)号：US5000006A

公开(公告)日：1991-03-19

申请号：US310929

申请日：1989-02-16

申请人： Hiroyuki Itoh ,  Yoshitsugu Kono ,  Isao Kikuchi ,  Shinji Takenaka ,  Masanobu Ajioka ,  Mitsuo Kudoh

发明人： Hiroyuki Itoh ,  Yoshitsugu Kono ,  Isao Kikuchi ,  Shinji Takenaka ,  Masanobu Ajioka ,  Mitsuo Kudoh

IPC分类号： C01B7/01 ,  B01D53/68 ,  C01B7/07

CPC分类号： B01D53/68 ,  C01B7/0743 ,  Y10S62/921

摘要： A gaseous mixture containing chlorine, carbon dioxide and non-condensable gas is compressed and cooled to separate it into a residual gas formed principally of a major portion of the non-condensable gas and a condensate formed primarily of chlorine. The condensate is fed to a stripping column to desorb carbon dioxide and a minor portion of the non-condensable gas dissolved in the condensate. The stripped gas formed primarily of chlorine and carbon dioxide may be treated further. Namely, the stripped gas is mixed with the residual gas. At least a portion of the mixed gas is fed into an absorption column, whereby a major portion of remaining chlorine is absorbed to lower the chlorine content. Removal of chlorine from such a gaseous mixture or an off-gas from the above process can be achieved by washing it with an aqueous solution or suspension containing an alkali metal sulfite and/or an alkaline earth metal sulfite while controlling the pH of the solution or suspension within a range of 1.9-6.3.

公开(公告)号：US4922005A

公开(公告)日：1990-05-01

申请号：US797457

申请日：1985-11-13

申请人： Masanobu Ajioka ,  Makoto Aiga ,  Masafumi Kataita ,  Akihiro Tamaki

发明人： Masanobu Ajioka ,  Makoto Aiga ,  Masafumi Kataita ,  Akihiro Tamaki

IPC分类号： C07C263/10

CPC分类号： C07C263/10

摘要： Hexamethylene diisocyanate (HDI) is prepared by introducing a hexamethylenediamine (HDA) solution and an equivalent amount or more of hydrogen chloride gas simultaneously into a turbulent zone in the vicinity of an agitating blade in an inert organic solvent held under agitation within a tank-shaped reactor and allowing them to undergo a successive salt-forming reaction so as to obtain a high-concentration slurry of hexamethylenediamine hydrochloride (HDA.multidot.HCl) and then reacting the slurry with phosgene. The phosgenation is effected by charging an HDA.multidot.HCl slurry of a high concentration, such as that obtained by the above process, into a tank-shaped reactor held under a pressure above the atmosphere pressure but below 5 kg/cm.sup.2 G and controlling the amount of phosgene, which is to be blown into the reactor, at a level 1-18 molar times per hour the total amount of HDA.multidot.HCl and HDI in the reaction mixture. In a preferred embodiment of the phosgenation, the phosgenation reaction is effected in a continuous two-step tank-shaped reactor while controlling the degree of conversion in the first step within 70-95%. This is a rationalized preparation process of hexamethylene diisocyanate since it requires a shorter overall phosgenation time.

摘要翻译： 六亚甲基二异氰酸酯（HDI）是通过将六亚甲基二胺（HDA）溶液和等当量的氯化氢气体同时引入搅拌叶片附近的湍流区域，在惰性有机溶剂中保持搅拌状态的罐形 反应器中并使它们经历连续的成盐反应，以获得六亚甲基二胺盐酸盐（HDAxHCl）的高浓度浆料，然后使该浆料与光气反应。 光气化是通过将高浓度的HDAxHCl浆料（例如通过上述方法获得的）输送到保持在高于大气压力但低于5kg / cm2G的压力下的罐形反应器中并控制光气的量来实现的， 其将以每小时1-18摩尔倍的速率吹入反应器，反应混合物中的HDAxHCl和HDI的总量。 在光气化的优选实施方案中，光气化反应在连续的两步槽形反应器中进行，同时控制第一步中的转化率在70-95％之内。 这是六亚甲基二异氰酸酯的合理制备方法，因为它需要更短的整体光气化时间。