NL7300367A - Distillation of formaldehyde solns - in presence of alkanols and dialkylethers to give low methanol prod - Google Patents

Distillation of formaldehyde solns - in presence of alkanols and dialkylethers to give low methanol prod

Info

Publication number
NL7300367A
NL7300367A NL7300367A NL7300367A NL7300367A NL 7300367 A NL7300367 A NL 7300367A NL 7300367 A NL7300367 A NL 7300367A NL 7300367 A NL7300367 A NL 7300367A NL 7300367 A NL7300367 A NL 7300367A
Authority
NL
Netherlands
Prior art keywords
methanol
solns
column
formaldehyde
hcho
Prior art date
Application number
NL7300367A
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
Priority claimed from DE19722201434 external-priority patent/DE2201434C3/en
Priority claimed from DE2201865A external-priority patent/DE2201865C3/en
Application filed filed Critical
Publication of NL7300367A publication Critical patent/NL7300367A/en

Links

Classifications

    • 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
    • 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
    • C07C45/78—Separation; Purification; Stabilisation; Use of additives
    • C07C45/81—Separation; Purification; Stabilisation; Use of additives by change in the physical state, e.g. crystallisation
    • C07C45/82—Separation; Purification; Stabilisation; Use of additives by change in the physical state, e.g. crystallisation by distillation
    • C07C45/83—Separation; Purification; Stabilisation; Use of additives by change in the physical state, e.g. crystallisation by distillation by extractive distillation

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

Aqueous formaldehyde solns. with low methanol content are made by distilling methanol-contg. aqs. HCHO solns. in the pres. of alkanol(s) with >7C and dialkyl ether(s) with >7C in each alkyl gp. The crude HCHO solns. are made in the usual way by oxidative dehydrogenation of methanol using Ag or metal oxide catalysts. After dissolving the prods. in water, a prod. is obt. contg. 28-65% HCHO and 1-20 wt.% methanol. These solns. are now distilled in a suitable column, when methanol is obt. as top product and a low-methanol formaldehyde soln. as bottom product. The alkanol/dialkyl ether mixture (e.g. a thick oil solvent made by distillation of fatty alcohols made by the oxo process) is added continuously or discontinuously to the column to prevent solidification of the product in the column, with consequent rise in pressure in the column and reduction of output.
NL7300367A 1972-01-13 1973-01-10 Distillation of formaldehyde solns - in presence of alkanols and dialkylethers to give low methanol prod NL7300367A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19722201434 DE2201434C3 (en) 1972-01-13 1972-01-13 Process for the production of formaldehyde
DE2201865A DE2201865C3 (en) 1972-01-15 1972-01-15 Process for the preparation of low-methanol, aqueous formaldehyde solutions

Publications (1)

Publication Number Publication Date
NL7300367A true NL7300367A (en) 1973-07-17

Family

ID=25762554

Family Applications (1)

Application Number Title Priority Date Filing Date
NL7300367A NL7300367A (en) 1972-01-13 1973-01-10 Distillation of formaldehyde solns - in presence of alkanols and dialkylethers to give low methanol prod

Country Status (1)

Country Link
NL (1) NL7300367A (en)

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Legal Events

Date Code Title Description
BV The patent application has lapsed