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    • 2. 发明授权
    • Preparation of polyoxymethylene dimethyl ethers by catalytic conversion
of dimethyl ether with formaldehyde formed by oxy-dehydrogenation of
dimethyl ether
    • 通过二甲醚的氧化脱氢形成的二甲醚与甲醛的催化转化制备聚甲醛二甲醚
    • US5959156A
    • 1999-09-28
    • US190359
    • 1998-11-12
    • Gary P. HagenMichael J. Spangler
    • Gary P. HagenMichael J. Spangler
    • C07C41/56C07C43/30C10L1/02C07C43/11
    • C10L1/026C07C41/56C07C43/30Y02P20/127
    • A particularly useful process which includes the steps of providing a source of formaldehyde formed by conversion of dimethyl ether in the presence of a catalyst comprising silver as an essential catalyst component; and contacting the source of formaldehyde and a predominately dimethyl ether feedstream with a heterogeneous, condensation promoting catalyst capable of hydrating dimethyl ether under conditions of reaction sufficient to form an effluent comprising water, methanol, formaldehyde, dimethyl ether, and polyoxymethylene dimethyl ethers is disclosed. Unreacted dimethyl ether is recovered from the effluent and recycled to the formation of polyoxymethylene dimethyl ethers. The resulting dimethyl ether-free liquid mixture is heated in the presence of an acidic catalyst to convert at least the methanol and formaldehyde present to polyoxymethylene dimethyl ethers. Advantageously, methylal and higher polyoxymethylene dimethyl ethers are formed and separated in a catalytic distillation column. By including in the column an anion exchange resin, an essentially acid-free product is obtained which can be used directly as a blending component, or fractionated, as by further distillation, to provide more suitable components for blending into diesel fuel.
    • 一种特别有用的方法,其包括以下步骤:在包含银作为必需催化剂组分的催化剂存在下,通过转化二甲醚形成甲醛源; 并且公开了使甲醛源和主要是二甲醚进料流与能够在足以形成包含水,甲醇,甲醛,二甲醚和聚甲醛二甲醚的流出物的反应条件下使二甲醚水合的异相缩合促进催化剂。 从流出物中回收未反应的二甲醚,再循环至形成聚甲醛二甲醚。 将所得的无二甲醚液体混合物在酸性催化剂存在下加热至少将甲醇和甲醛转化为聚甲醛二甲醚。 有利地,甲缩醛和更高级的聚甲醛二甲醚在催化蒸馏塔中形成并分离。 通过在柱中包含阴离子交换树脂,获得基本上不含酸的产物,其可以直接用作共混组分,或通过进一步蒸馏分离,以提供更合适的用于混合到柴油中的组分。
    • 6. 发明授权
    • Preparation of polyoxymethylene dimethyl ethers by catalytic conversion
of dimethyl ether with formaldehyde formed by dehydrogenation of
dimethyl ether
    • 通过二甲醚与二甲醚脱氢形成的甲醛的催化转化制备聚甲醛二甲醚
    • US6160186A
    • 2000-12-12
    • US191399
    • 1998-11-12
    • Gary P. HagenMichael J. Spangler
    • Gary P. HagenMichael J. Spangler
    • C07C41/56C07C43/11
    • C07C41/56Y02P20/127C07C43/30
    • A particularly useful process which includes the steps of providing a source of formaldehyde formed by conversion of dimethyl ether in the presence of a catalyst comprising copper and zinc; and contacting the source of formaldehyde and a predominately dimethyl ether feedstream with a heterogeneous, condensation promoting catalyst capable of hydrating dimethyl ether under conditions of reaction sufficient to form an effluent comprising water, methanol, formaldehyde, dimethyl ether, and polyoxymethylene dimethyl ethers is disclosed. Unreacted dimethyl ether is recovered from the effluent and recycled to the formation of polyoxymethylene dimethyl ethers. The resulting dimethyl ether-free liquid mixture is heated in the presence of an acidic catalyst to convert at least the methanol and formaldehyde present to polyoxymethylene dimethyl ethers. Advantageously, methylal and higher polyoxymethylene dimethyl ethers are formed and separated in a catalytic distillation column. By including in the column an anion exchange resin, an essentially acid-free product is obtained which can be used directly as a blending component, or fractionated, as by further distillation, to provide more suitable components for blending into diesel fuel.
    • 一种特别有用的方法,其包括在包含铜和锌的催化剂存在下提供通过二甲醚转化形成的甲醛源的步骤; 并且公开了使甲醛源和主要是二甲醚进料流与能够在足以形成包含水,甲醇,甲醛,二甲醚和聚甲醛二甲醚的流出物的反应条件下使二甲醚水合的异相缩合促进催化剂。 从流出物中回收未反应的二甲醚,再循环至形成聚甲醛二甲醚。 将所得的无二甲醚液体混合物在酸性催化剂存在下加热至少将甲醇和甲醛转化为聚甲醛二甲醚。 有利地,甲缩醛和更高级的聚甲醛二甲醚在催化蒸馏塔中形成并分离。 通过在柱中包含阴离子交换树脂,获得基本上不含酸的产品,其可以直接用作共混组分,或通过进一步蒸馏分离,以提供更合适的用于混合到柴油中的组分。