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    Production of formaldehyde
    1.
    发明授权
    Production of formaldehyde 失效
    生产甲醛

    公开(公告)号：US3928461A

    公开(公告)日：1975-12-23

    申请号：US37225773

    申请日：1973-06-21

    Applicant: BASF AG

    Inventor： DIEM HANS ,  MATTHIAS GUENTHER ,  AICHER ALBRECHT ,  HAAS HANS ,  SCHREIBER HANS ,  SPERBER HEINRICH

    IPC: C07C47/055 ,  C07C45/00 ,  C07C45/38 ,  C07C67/00 ,  D06P3/54 ,  C07C45/15

    CPC classification number: D06P3/54 ,  C07C45/38 ,  C07C47/04

    Abstract: A process for producing formaldehyde by oxidizing dehydrogenation of methanol in the presence of a silver catalyst, wherein a vaporous mixture of water and oxygen is introduced into the vaporous starting mixture containing water, methanol and oxygen before entry into the catalyst bed. Formaldehyde produced by the process is a disinfectant, tanning agent, reducing agent and raw material for the production of synthetic resins, adhesives and plastics.

    Abstract translation: 在银催化剂存在下，通过氧化甲醇脱氢生产甲醛的方法，其中在进入催化剂床之前，将含有水和氧气的混合物引入含水，甲醇和氧气的气态起始混合物中。 该方法生产的甲醛是生产合成树脂，粘合剂和塑料的消毒剂，鞣剂，还原剂和原料。

    PRODUCTION OF FORMALDEHYDE
    5.
    发明专利
    PRODUCTION OF FORMALDEHYDE 未知

    公开(公告)号：GB1425751A

    公开(公告)日：1976-02-18

    申请号：GB3001273

    申请日：1973-06-25

    Applicant: BASF AG

    Inventor： DIEM HANS DR ,  MATTHIAS GUENTHER DR ,  AICHER ALBRECHT ,  HAAS HANS DR ,  SCHREIBER HANS DIPL ING ,  SPERBER HEINRICH DR

    IPC: C07C47/055 ,  C07C45/00 ,  C07C45/38 ,  C07C67/00 ,  D06P3/54 ,  C07C47/04 ,  C07C45/16

    Abstract: 1425751 Formaldehyde BADISCHE ANILIN- & SODA-FABRIK AG 25 June 1973 [26 June 1972] 30012/73 Heading C2C In a process for producing formaldehyde by oxidizing dehydrogenation of methanol in the presence of a silver catalyst at elevated temperature, the reaction is carried out at a temperature of 550‹ to 750‹ C. and during the reaction an additional vapour mixture of oxygen and water heated to at least 70‹ C. and providing 0À05 to 0À8 mole of water and of 0À005 to 0À06 mole of oxygen (O 2 ) based on 1 mole of feed methanol, is introduced into the vaporous starting mixture which has been heated to at least 60‹ C. and contains from 0À09 to 1À8 moles of water and 0À35 to 0À5 moles of oxygen (O 2 ) per 1 mole of methanol before said starting mixture enters the catalyst bed, the space velocity being 0À9 to 3 metric tons of methanol per square meter of catalyst bed cross-section per hour. The plant may consist of a plurality of reactors in parallel, and not all the reactors need be operated according to the invention, at least not all the time. The reaction temperature may be raised in steps. Baffles at which impurities collected and removed may be provided downstream of the point of introduction of the additional vapour mixture but upstream of the catalyst bed.

    PROCESS FOR THE PREPARATION OF FORMALDEHYDE
    8.
    发明专利
    PROCESS FOR THE PREPARATION OF FORMALDEHYDE 未知

    公开(公告)号：DE3461368D1

    公开(公告)日：1987-01-08

    申请号：DE3461368

    申请日：1984-12-18

    Applicant: BASF AG

    Inventor： AICHER ALBRECHT ,  LEHMANN GUNTER ,  PETRI NORBERT DR ,  PITTEROFF WALTER DR ,  REUSS GUENTER DR ,  SCHREIBER HANS ,  SEBASTIAN ROBERT

    IPC: B01J23/00 ,  B01J23/50 ,  C07B61/00 ,  C07C45/00 ,  C07C45/38 ,  C07C45/78 ,  C07C45/80 ,  C07C45/81 ,  C07C47/04 ,  C07C47/055 ,  C07C67/00

    Abstract: Formaldehyde is prepared by (a) passing a mixture of methanol and water with a concentration of between 50 and 90% by weight, based on the total weight of the two substances, of methanol into a packed column which possesses a packing having a total layer thickness of not less than 50 cm and a total surface area of not less than 0.5 cm2 per cm3 of packing, a liquid circulation of from 15 to 90 g/min per g/min of methanol fed to the column, and a concentration of from 10 to 45% by weight of methanol in the recycle liquid, the temperature at the point of entry of the recycle liquid in the column being from 50 DEG to 86 DEG C. and the bottom temperature being 10 DEG -25 DEG C. lower than this, i.e. from 40 DEG to 70 DEG C., (b) separating off methanol and water from the column by stripping with air, an inert gas and/or exit gas, the throughput being from 0.5 to 3 tonnes of methanol and water per hour per m2 of column cross-section, (c) converting the gaseous mixture of methanol, water, air, inert gas and/or exit gas at a space velocity of from 0.5 to 3 tonnes of methanol per m2 of catalyst bed cross-section per hour, in the presence of a silver catalyst at from 550 DEG to 750 DEG C. and (d) finally, cooling and absorbing the hot reaction gases, and using the resulting heat of absorption and, if desired, the heat of reaction and/or the heat of condensation partially or completely for heating the recycle liquid, methanol containing impurities being used if desired and, after the stages (a) and (b) and before the stages (c) and (d), the measures of a stage (e) being carried out, wherein the gaseous mixture formed is passed through two layers of wire filter having a wire diameter of from 0.1 to 0.5 mm and a free layer volume of from 90 to 99.5 vol. %, based on the total volume of one wire layer, at a flow rate of from 7 to 13 m/sec in the first layer, and from 1 to 4 m/sec in the second layer. The formaldehyde obtainable by the process of the invention is a disinfectant, tanning agent, reducing agent and a useful starting material for the preparation of synthetic resins, adhesives and plastics.

    MANUFACTURE OF CONCENTRATED AQUEOUS SOLUTIONS OF FORMALDEHYDE
    9.
    发明专利
    MANUFACTURE OF CONCENTRATED AQUEOUS SOLUTIONS OF FORMALDEHYDE 未知

    公开(公告)号：CA1058221A

    公开(公告)日：1979-07-10

    申请号：CA235507

    申请日：1975-09-11

    Applicant: BASF AG

    Inventor： AICHER ALBRECHT ,  HAAS HANS ,  DIEM HANS ,  DUDECK CHRISTIAN ,  BRUNNMUELLER FRITZ ,  LEHMANN GUNTER

    IPC: C07B61/00 ,  C07C45/00 ,  C07C45/38 ,  C07C45/78 ,  C07C47/055 ,  C07C47/058 ,  C07C67/00 ,  C07C47/04

    Abstract: Concentrated aqueous solutions of formaldehyde are manufactured by the oxidative dehydrogenation of methanol with air in the presence of a silver crystal catalyst bed and of steam, at a temperature from 550 to 780.degree.C, followed by absorption, in water, of the formaldehyde formed. According to the invention, the reaction is carried out with a throughput of from 1 to 3 tonnes of methanol per square meter of catalyst bed cross-section per hour in the presence of from 0.1 to 1.8 moles of water and from 0.04 to 0.4 mole of formaldehyde per mole of total methanol fed to the catalyst, the formaldehyde and from 0.1 to 1.8 moles of water per mole of total methanol fed to the catalyst are taken from the reaction mixture after the reaction and added to the starting mixture, and (a) a part of the formaldehyde and water is abstracted from the formaldehyde solution, formed in the absorption stage, by means of the air fed to the reaction, at from 60 to 90.degree.C, or (b) a part of the formaldehyde solution formed in the absorption stage is vaporized and recycled to the reaction, or (c) simultaneously a part of the formaldehyde and water is abstracted from the formaldehyde solution, formed in the absorption stage, by the air fed to the reaction, at from 60 to 90.degree.C, and a part of the formaldehyde solution formed in the absorption stage is vaporized and recycled to the reaction. The formaldehyde solution obtained by this process may be used as a disinfectant, tanning agent, reducing agent and starting material for the manufacture of synthetic resins, adhesives and plastics.

    10.
    发明专利
    未知

    公开(公告)号：DE19605212A1

    公开(公告)日：1997-08-14

    申请号：DE19605212

    申请日：1996-02-13

    Applicant: BASF AG

    Inventor： DIERCKS RAINER DR ,  KNUTH BERNHARD DR ,  AICHER ALBRECHT

    IPC: B01J27/18 ,  B01J37/34 ,  C07C45/38 ,  C07C47/052 ,  C07C47/04

    Abstract: Proposed is a packed silver-catalyst bed doped with phosphorus, the bed being produced as follows: I) silver crystals obtained by the electrolytic precipitation of silver from an aqueous silver-salt solution are placed to form an outlet packed bed of silver catalyst, II) said bed is activated by passing a gaseous mixture containing methanol and oxygen (gas mixture M) through the bed at a temperature of 150 to 800 DEG C and III) the activated bed is doped with 1 to 20,000 ppm by weight (relative to the silver) of phosphorus by contacting it with a finely divided phosphorus compound (phosphorus compound B) having a melting or decomposition point higher than 500 DEG C.

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