GB593838A - Improvements in and relating to the production of formaldehyde - Google Patents

Improvements in and relating to the production of formaldehyde

Info

Publication number
GB593838A
GB593838A GB15226/45A GB1522645A GB593838A GB 593838 A GB593838 A GB 593838A GB 15226/45 A GB15226/45 A GB 15226/45A GB 1522645 A GB1522645 A GB 1522645A GB 593838 A GB593838 A GB 593838A
Authority
GB
United Kingdom
Prior art keywords
manganese
phosphate
kneaded
ammonium molybdate
prepared
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB15226/45A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
EIDP Inc
Original Assignee
EI Du Pont de Nemours and Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by EI Du Pont de Nemours and Co filed Critical EI Du Pont de Nemours and Co
Publication of GB593838A publication Critical patent/GB593838A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J27/00—Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon compounds
    • B01J27/14—Phosphorus; Compounds thereof
    • B01J27/186—Phosphorus; Compounds thereof with arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
    • B01J27/188—Phosphorus; Compounds thereof with arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium with chromium, molybdenum, tungsten or polonium
    • B01J27/19—Molybdenum
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C45/00—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds
    • C07C45/27—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by oxidation
    • C07C45/32—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by oxidation with molecular oxygen
    • C07C45/37—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by oxidation with molecular oxygen of >C—O—functional groups to >C=O groups
    • C07C45/38—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by oxidation with molecular oxygen of >C—O—functional groups to >C=O groups being a primary hydroxyl group

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

Catalysts used for the oxidation of methanol to formaldehyde contain phosphorus, molybdenum as a promoter and one of the metals manganese, magnesium, cadmium and the alkaline earth metals, the atomic ratio of phosphorus to molybdenum being at least 2 : 1. They may be further promoted by the addition of alkali metal phosphates and carbonates and are prepared as follows: (1) manganese-phosphate is precipitated by adding ammonium hydroxide to a solution of manganese nitrate and phosphoric acid, and after washing and drying is kneaded with ammonium molybdate and dried; (2) hydrated manganese acetate is kneaded with orthophosphoric acid and ammonium molybdate and ignited; (3) manganese phosphate is kneaded with ammonium molybdate and sodium hydrogen phosphate; (4) calcium phosphate is p precipitated by means of ammonia from a solution of calcium nitrate and phosphoric acid. After washing, the calcium phosphate is kneaded with ammonium molybdate and water and ignited; (5) calcium phosphate-molybdate catalyst prepared as in (4) is further promoted by adding sodium hydrogen phosphate and igniting.ALSO:Formaldehyde is prepared by oxidizing methanol in the vapour phase with an oxygen containing gas in the presence of an oxidation catalyst containing (1) phosphorus, (2) molybdenum, as a promoter, and (3) one of the metals manganese, magnesium, cadmium and the alkaline earth metals, the atomic ratio of phosphorus to molybdenum being at least 2 : 1. The catalyst may also be further promoted by the addition of alkali metal phosphates or carbonates and may be supported on a carrier such as pumice, silica gel or infusorial earth. Catalysts may be prepared as follows: (1) manganese phosphate is precipitated by adding ammonium hydroxide to a solution of manganese nitrate and phosphoric acid and after washing and drying is kneaded with ammonium molybdate and dried; (2) hydrated manganese acetate is kneaded with orthophosphoric acid and ammonium molybdate and ignited; (3) manganese phosphate is kneaded with ammonium molybdate and sodium hydrogen phosphate; (4) calcium phosphate is precipitated by means of ammonia from a solution of calcium nitrate containing also phosphoric acid. After washing and igniting, the calcium phosphate is kneaded with ammonium molybdate and water and again ignited; (5) calcium phosphate-molybdate catalyst prepared as in (4) is further promoted by adding sodium hydrogen phosphate and igniting. Specifications 280,712, 286,212, 296,071, 298,142, [all in Class 2 (iii)], and 547,743 are referred to.
GB15226/45A 1944-06-16 1945-06-15 Improvements in and relating to the production of formaldehyde Expired GB593838A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US593838XA 1944-06-16 1944-06-16

Publications (1)

Publication Number Publication Date
GB593838A true GB593838A (en) 1947-10-27

Family

ID=22022605

Family Applications (1)

Application Number Title Priority Date Filing Date
GB15226/45A Expired GB593838A (en) 1944-06-16 1945-06-15 Improvements in and relating to the production of formaldehyde

Country Status (1)

Country Link
GB (1) GB593838A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0294684A2 (en) * 1987-06-06 1988-12-14 Hoechst Aktiengesellschaft Method for the production of formaldehyde

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0294684A2 (en) * 1987-06-06 1988-12-14 Hoechst Aktiengesellschaft Method for the production of formaldehyde
EP0294684A3 (en) * 1987-06-06 1989-10-11 Hoechst Aktiengesellschaft Method for the production of formaldehyde

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