Organic compounds -- part of the class 532-570 series – Organic compounds – Hydroxamic acids – chalcogen analogs or salts thereof
Patent
1998-11-12
2000-12-12
Carr, Deborah D.
Organic compounds -- part of the class 532-570 series
Organic compounds
Hydroxamic acids, chalcogen analogs or salts thereof
568613, 568621, C07C 4311
Patent
active
061601748
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 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.
REFERENCES:
patent: 2449469 (1948-09-01), Gresham et al.
patent: 2663742 (1953-12-01), Frevel et al.
patent: 2882243 (1959-04-01), Milton
patent: 2882244 (1959-04-01), Milton
patent: 3130007 (1964-04-01), Breck
patent: 3702886 (1972-11-01), Argauer et al.
patent: 3709979 (1973-01-01), Chu
patent: 3832449 (1974-08-01), Rosinski et al.
patent: 4215011 (1980-07-01), Smith
patent: 4268420 (1981-05-01), Klotz
patent: 4269813 (1981-05-01), Klotx
patent: 4292457 (1981-09-01), Klotz
patent: 4292458 (1981-09-01), Klotz
patent: 4341069 (1982-07-01), Bell et al.
patent: 4359587 (1982-11-01), Abdurakhmanov et al.
patent: 4443559 (1984-04-01), Smith, Jr.
patent: 4474996 (1984-10-01), Carcia et al.
patent: 4521618 (1985-06-01), Arntz et al.
patent: 4786743 (1988-11-01), Bongaarts et al.
patent: 4967014 (1990-10-01), Masamoto et al.
patent: 5102838 (1992-04-01), Beck et al.
patent: 5113015 (1992-05-01), Plamer et al.
patent: 5401884 (1995-03-01), Diercks et al.
patent: 5746785 (1998-05-01), Moulton et al.
Hagen Gary P.
Spangler Michael J.
BP Amoco Corporation
Carr Deborah D.
Jerome Frederick S.
Keys Rosalynd
Yesukevich Robert A.
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