Preparation of polyoxymethylene dimethyl ethers by catalytic con

Details Preparation of polyoxymethylene dimethyl ethers by catalytic con Preparation of polyoxymethylene dimethyl ethers by catalytic con

1998-11-12

2000-12-26

Richter, Johann

Organic compounds -- part of the class 532-570 series

Organic compounds

Oxygen containing

568618, 568621, 568474, C07C 4311

Patent

active

061662666

ABSTRACT:
A particularly useful process which includes the steps of providing a source of formaldehyde formed by conversion of methanol in the presence of a catalyst comprising oxides of molybdenum 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.

REFERENCES:
patent: 1913404 (1933-06-01), Meharg et al.
patent: 2449469 (1948-09-01), Gresham et al.
Lewis, Hawley's Condensed Chemical Dictionary, Twelfth edition, p. 536, 1993.

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