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    • 2. 发明授权
    • Method for producing polyoxymethylene dimethyl ethers from methanol and formaldehyde
    • 从甲醇和甲醛生产聚甲醛二甲醚的方法
    • US07671240B2
    • 2010-03-02
    • US11917528
    • 2006-06-12
    • Eckhard StroeferHans HasseSergej Blagov
    • Eckhard StroeferHans HasseSergej Blagov
    • C07C41/56C08G2/08
    • C07C41/48C07C41/56C07C41/58C08G2/08C07C43/30
    • Processes for preparing tri- and tetraoxymethylene glycol dimethyl ether (POMDMEn=3,4) include feeding a reaction mixture of an aqueous formaldehyde solution and methanol into a reactive evaporator and separating into a first low boiler fraction and a first high boiler fraction, recycling the first high boiler fraction into the reactor, feeding the first low boiler fraction into a first distillation column and separating into a second low boiler fraction and a second high boiler fraction, recycling the second high boiler fraction into the reactive evaporator, feeding the second low boiler fraction into a second distillation column and separating into a third low boiler fraction and a third high boiler fraction, feeding the third high boiler fraction into a phase separation apparatus and separating into an aqueous phase and an organic phase, and feeding the organic phase into a third distillation column and separating into a low and high boiler fractions.
    • 制备三 - 和四甲基二醇二甲醚(POMDMEn = 3,4)的方法包括将甲醛水溶液和甲醇的反应混合物进料到反应蒸发器中,并分离成第一低沸点馏分和第一高沸点馏分,循环利用 将第一高锅炉馏分进入反应器,将第一低沸点馏分进料到第一蒸馏塔中并分离成第二低沸点馏分和第二高沸点馏分,将第二高沸点馏分再循环到反应蒸发器中,将第二低沸点馏分 将馏分分馏成第二蒸馏塔并分离成第三低沸点馏分和第三高沸点馏分,将第三高沸点馏分进料到相分离装置中并分离成水相和有机相,并将有机相进料至 第三蒸馏塔并分离成低和高沸点馏分。
    • 4. 发明授权
    • Process for polymerizing formaldehyde
    • 聚合甲醛的方法
    • US4352923A
    • 1982-10-05
    • US204353
    • 1980-11-05
    • Hisashi KonoKenji TeraiMasaki HisadomiKatumi UemuraSumio OhtaYoshiichi Yamamoto
    • Hisashi KonoKenji TeraiMasaki HisadomiKatumi UemuraSumio OhtaYoshiichi Yamamoto
    • C08G2/06C08G2/08C08G2/30C08G6/00
    • C08G2/08C08G2/06C08G2/30
    • Undesirable deposition of polyoxymethylene onto the inner wall of a polymerization reactor and onto a stirrer, which deposition is observed in the slurry polymerization of formaldehyde carried out in an inert organic liquid medium, can be minimized by carrying out the slurry polymerization in the presence of a polymerization catalyst prepared by bringing a metal chelate compound into contact with polyoxymethylene in an inert organic liquid medium in the presence of formaldehyde. Preferably, the slurry polymerization is carried out in the presence of, in addition to the above-mentioned polymerization catalyst, at least one polyvalent metal salt of an alkylsalicylic acid or of a dialkyl ester of sulfosuccinic acid. It is also preferable to use a tubular closed loop reactor equipped with an impeller wherein gaseous formaldehyde is blown into the reactor in a position located downstream from the impeller, while the catalyst-containing slurry is circulated therethrough.
    • 在聚合反应器的内壁和在惰性有机液体介质中进行的甲醛的淤浆聚合中观察到沉积物的聚合反应器的不期望的沉积可以通过在存在下进行淤浆聚合来最小化 在甲醛存在下,通过在惰性有机液体介质中使金属螯合物与聚甲醛接触而制备的聚合催化剂。 优选地,在除上述聚合催化剂之外还存在至少一种烷基水杨酸的多价金属盐或磺基琥珀酸的二烷基酯的情况下进行淤浆聚合。 还优选使用配备有叶轮的管状闭环反应器,其中在位于叶轮下游的位置将气态甲醛吹入反应器中,同时含催化剂的浆料循环通过。