GB1190682A - Concentration of Aqueous Formaldehyde Solutions. - Google Patents

Concentration of Aqueous Formaldehyde Solutions.

Info

Publication number
GB1190682A
GB1190682A GB1408468A GB1408468A GB1190682A GB 1190682 A GB1190682 A GB 1190682A GB 1408468 A GB1408468 A GB 1408468A GB 1408468 A GB1408468 A GB 1408468A GB 1190682 A GB1190682 A GB 1190682A
Authority
GB
United Kingdom
Prior art keywords
temperature
concentrated
distillation
solution
stability
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
GB1408468A
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.)
Societa Italiana Resine SpA SIR
Original Assignee
Societa Italiana Resine SpA SIR
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 Societa Italiana Resine SpA SIR filed Critical Societa Italiana Resine SpA SIR
Publication of GB1190682A publication Critical patent/GB1190682A/en
Expired legal-status Critical Current

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
    • C07C45/78—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

Landscapes

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

Abstract

1,190,682. Concentrating aqueous formaldehyde solutions. SOC. ITALIANA RESINE S.p.A. 22 March, 1968 [23 March, 1967], No. 14084/68. Heading C2C. Aqueous formaldehyde solutions are concentrated by distillation, wherein the concentration is effected under reduced pressure in one or more distillation steps, the distillation temperature of each stage being below the stability temperature of the concentrated aqueous solution formed therein, i.e. the temperature below which solid polyoxymethylenes precipitate and the concentrated solution being subjected to said distillation temperature for a period shorter than that required for the solution to become turbid or for solid bodies to appear therein, and wherein the concentrated aqueous solution of each stage, after formation, is subjected to an ageing period at a temperature exceeding the stability temperature of the concentrated solution. During each evaporation step the temperature is preferably maintained below 100‹ C. and particularly 5‹ C. below the stability temperature of the concentrated solution produced in each step. The preferred ageing temperature exceeds the stability temperature by at least 5‹ C. while the ageing period should be between 0À5 and 30 minutes. Thin film evaporators or molecular distillation apparatus is particularly suitable.
GB1408468A 1967-03-23 1968-03-22 Concentration of Aqueous Formaldehyde Solutions. Expired GB1190682A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT791442 1967-03-23

Publications (1)

Publication Number Publication Date
GB1190682A true GB1190682A (en) 1970-05-06

Family

ID=11125513

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1408468A Expired GB1190682A (en) 1967-03-23 1968-03-22 Concentration of Aqueous Formaldehyde Solutions.

Country Status (1)

Country Link
GB (1) GB1190682A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1063221A1 (en) * 1999-06-07 2000-12-27 Basf Aktiengesellschaft Process for the reaction of a solution containing a mixture
WO2003040075A2 (en) * 2001-11-05 2003-05-15 Basf Aktiengesellschaft Highly concentrated formaldehyde solution, production and reaction thereof
WO2004078678A2 (en) * 2003-03-04 2004-09-16 Basf Aktiengesellschaft Method for the production of highly concentrated formaldehyde solutions
WO2004078691A1 (en) * 2003-03-04 2004-09-16 Basf Aktiengesellschaft Method for thermal stabilization of highly concentrated formaldehyde solutions
WO2004078690A1 (en) * 2003-03-04 2004-09-16 Basf Aktiengesellschaft Method for preparing highly concentrated, gaseous formaldehydes

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1063221A1 (en) * 1999-06-07 2000-12-27 Basf Aktiengesellschaft Process for the reaction of a solution containing a mixture
WO2003040075A2 (en) * 2001-11-05 2003-05-15 Basf Aktiengesellschaft Highly concentrated formaldehyde solution, production and reaction thereof
WO2003040075A3 (en) * 2001-11-05 2003-08-07 Basf Ag Highly concentrated formaldehyde solution, production and reaction thereof
US7193115B2 (en) 2001-11-05 2007-03-20 Basf Aktiengesellschaft Highly concentrated formaldehyde solution, production and reaction thereof
WO2004078678A2 (en) * 2003-03-04 2004-09-16 Basf Aktiengesellschaft Method for the production of highly concentrated formaldehyde solutions
WO2004078691A1 (en) * 2003-03-04 2004-09-16 Basf Aktiengesellschaft Method for thermal stabilization of highly concentrated formaldehyde solutions
WO2004078690A1 (en) * 2003-03-04 2004-09-16 Basf Aktiengesellschaft Method for preparing highly concentrated, gaseous formaldehydes
WO2004078678A3 (en) * 2003-03-04 2004-11-04 Basf Ag Method for the production of highly concentrated formaldehyde solutions
US7273955B2 (en) 2003-03-04 2007-09-25 Basf Aktiengesellschaft Method for thermal stabilization of highly concentrated formaldehyde solutions
US7345207B2 (en) 2003-03-04 2008-03-18 Basf Aktiengesellschaft Production of high-concentration formaldehyde solutions
CN100387565C (en) * 2003-03-04 2008-05-14 巴斯福股份公司 Method for the production of highly concentrated formaldehyde solutions
US7390932B2 (en) 2003-03-04 2008-06-24 Basf Aktiengesellschaft Method for preparing highly concentrated, gaseous formaldehydes

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Legal Events

Date Code Title Description
PS Patent sealed
435 Patent endorsed 'licences of right' on the date specified (sect. 35/1949)
PCNP Patent ceased through non-payment of renewal fee