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    PRODUCTION OF ANHYDROUS OR SUBSTANTIALLY ANHYDROUS FORMIC ACID
    3.
    发明专利
    PRODUCTION OF ANHYDROUS OR SUBSTANTIALLY ANHYDROUS FORMIC ACID 未知

    公开(公告)号：ZA802156B

    公开(公告)日：1981-05-27

    申请号：ZA802156

    申请日：1980-04-10

    Applicant: BASF AG

    Inventor： SCHMIDT R ,  KAIBEL G ,  BLOCK U ,  BOTT K ,  WOLF D ,  SCHOENMAKERS H

    IPC: C07C27/02 ,  C07C53/02 ,  C07C51/00 ,  C07C51/09 ,  C07C51/42 ,  C07C51/44 ,  C07C51/48 ,  C07C67/00 ,  C07C

    Abstract: Anhydrous or substantially anhydrous formic acid is obtained by hydrolysis of methyl formate, in a process wherein (a) methyl formate is hydrolyzed, (b) the methanol and excess methyl formate are distilled from the hydrolysis mixture obtained, (c) the bottom product of distillation (b), consisting of formic acid and water, is extracted, in a liquid-liquid extraction, with an extractant which in the main takes up the formic acid, (d) the resulting extract phase, consisting of formic acid, the extractant and a part of the water, is subjected to distillation, (e) the top product obtained from this distillation and consisting of all or part of the water introduced into the distillation, and part of the formic acid, is recycled, as vapor, into the lower part of the distillation column of stage (b), (f) the bottom product of distillation stage (d), consisting of the extractant, with or without part of the water, and the greater part of the formic acid, is separated by distillation into anhydrous or substantially anhydrous formic acid and the extractant, and (g) the extractant leaving stage (f) is recycled to the process.

    5.
    发明专利
    未知

    公开(公告)号：SE339070B

    公开(公告)日：1971-09-27

    申请号：SE656669

    申请日：1969-05-08

    Applicant: BASF AG

    Inventor： NAGEL O ,  WEINFURTER K ,  WOLF D ,  PLATZ R ,  TAGLIEBER K

    IPC: C07C7/00 ,  F25J3/02 ,  C10L3/02

    Abstract: A gas mixture (obtained by thermal cracking of hydrocarbons followed by quenching of the cracked gas and freed from carbon dioxide and water) is separated into a gas mixture containing hydrogen, carbon monoxide and methane and another gas mixture containing ethylene, acetylene and higher hydrocarbons by (a) cooling the gas mixture which is at superatmospheric pressure in at least one condensation stage to a temperature which is above the solidification temperature of acetylene mixed with the other condensed constituents, (b) separating the condensate thus obtained and subdividing it in a rectifying column into a first mixture containing C2 hydrocarbons and a second mixture containing C3 and higher hydrocarbons, and (c) freeing the residual gas remaining from (a) from residual acetylene and ethylene in a scrubber by treatment with some of the mixture consisting of C3 and higher hydrocarbons from (b).

    MANUFACTURE OF FORMALDEHYDE
    6.
    发明专利
    MANUFACTURE OF FORMALDEHYDE 未知

    公开(公告)号：ZA744386B

    公开(公告)日：1975-08-27

    申请号：ZA744386

    申请日：1974-07-09

    Applicant: BASF AG

    Inventor： WOLF D ,  MATTHIAS G ,  DIEM H ,  GRABOWSKY O

    IPC: C07C45/00 ,  C07C45/38 ,  C07C47/055 ,  C07C67/00 ,  C07C47/04

    Abstract: Manufacture of formaldehyde by oxidative dehydrogenation of methanol in the presence of a silver catalyst using methanol obtained from a condensate derived from the evaporation of aqueous reaction mixtures in the synthesis of urea resins and then treated with caustic soda solution under specific conditions of temperature, pressure, residence time and initial formaldehyde concentration. The formaldehyde obtained is a disinfectant, tanning agent, reducing agent and starting material for the manufacture of synthetic resins, adhesives and plastics.

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