Organic compounds -- part of the class 532-570 series – Organic compounds – Oxygen containing
Patent
1998-11-12
1999-09-28
Geist, Gary
Organic compounds -- part of the class 532-570 series
Organic compounds
Oxygen containing
568613, C07C 4311
Patent
active
059591560
ABSTRACT:
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.
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Hagen Gary P.
Spangler Michael J.
BP Amoco Corporation
Geist Gary
Sloat Robert E.
Vollano Jean F
Yassen Thomas A.
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