NL6814946A - Recovery of formaldehyde from aqueous formaldehyde - streams - Google Patents

Recovery of formaldehyde from aqueous formaldehyde - streams

Info

Publication number
NL6814946A
NL6814946A NL6814946A NL6814946A NL6814946A NL 6814946 A NL6814946 A NL 6814946A NL 6814946 A NL6814946 A NL 6814946A NL 6814946 A NL6814946 A NL 6814946A NL 6814946 A NL6814946 A NL 6814946A
Authority
NL
Netherlands
Prior art keywords
formaldehyde
alcohol
aqueous
recovery
temp
Prior art date
Application number
NL6814946A
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 filed Critical
Priority to NL6814946A priority Critical patent/NL6814946A/en
Publication of NL6814946A publication Critical patent/NL6814946A/en

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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
    • C07C45/78—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

Abstract

Recovery of formaldehyde from aqueous formaldehyde streams. N5-. By (a) contacting the aqueous stream with a liquid alcohol having >4 C atoms at a temp. below the alcohol-formaldehyde dissociation temp., so that at least a part of the formaldehyde is extracted into the alcohol, (b) separating the alcohol from the aqueous tream, and (c) separating the alcohol and the formaldehyde by distillation at a temp. above the alcohol-formaldehyde dissociation temp. Recovery of formaldehyde from aqueous solutions is normally difficult because of the formation of hydrates of formaldehyde, such as methylene glycol and (CH2O)nH2O, but the use of the C6-10 aliphatic alcohol enables the formaldehyde to be effectively separated from the aqueous soln. in the form of a hemiformal, which can be subsequently dissociated into formaldehyde and alcohol.
NL6814946A 1968-10-18 1968-10-18 Recovery of formaldehyde from aqueous formaldehyde - streams NL6814946A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
NL6814946A NL6814946A (en) 1968-10-18 1968-10-18 Recovery of formaldehyde from aqueous formaldehyde - streams

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL6814946A NL6814946A (en) 1968-10-18 1968-10-18 Recovery of formaldehyde from aqueous formaldehyde - streams

Publications (1)

Publication Number Publication Date
NL6814946A true NL6814946A (en) 1970-04-21

Family

ID=19804958

Family Applications (1)

Application Number Title Priority Date Filing Date
NL6814946A NL6814946A (en) 1968-10-18 1968-10-18 Recovery of formaldehyde from aqueous formaldehyde - streams

Country Status (1)

Country Link
NL (1) NL6814946A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7338579B2 (en) 1998-06-05 2008-03-04 Lucite International Uk Limited Dewatering process
CN104710292A (en) * 2015-03-24 2015-06-17 江苏凯茂石化科技有限公司 Method for refining anhydrous pure formaldehyde gas and process device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7338579B2 (en) 1998-06-05 2008-03-04 Lucite International Uk Limited Dewatering process
CN104710292A (en) * 2015-03-24 2015-06-17 江苏凯茂石化科技有限公司 Method for refining anhydrous pure formaldehyde gas and process device
CN104710292B (en) * 2015-03-24 2017-06-06 江苏凯茂石化科技有限公司 A kind of process for purification and process unit of anhydrous pure formaldehyde gas

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