ES245221A1 - Método para obtener soluciones concentradas - Google Patents

Método para obtener soluciones concentradas

Info

Publication number
ES245221A1
ES245221A1 ES0245221A ES245221A ES245221A1 ES 245221 A1 ES245221 A1 ES 245221A1 ES 0245221 A ES0245221 A ES 0245221A ES 245221 A ES245221 A ES 245221A ES 245221 A1 ES245221 A1 ES 245221A1
Authority
ES
Spain
Prior art keywords
formaldehyde
urea
solutions
total
absorption
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
ES0245221A
Other languages
English (en)
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.)
Montedison SpA
Original Assignee
Montedison SpA
Montecatini Societa Generale per lIndustria Mineraria e Chimica SpA
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 Montedison SpA, Montecatini Societa Generale per lIndustria Mineraria e Chimica SpA filed Critical Montedison SpA
Publication of ES245221A1 publication Critical patent/ES245221A1/es
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G12/00—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen
    • C08G12/02—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes
    • C08G12/04—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with acyclic or carbocyclic compounds
    • C08G12/10—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with acyclic or carbocyclic compounds with acyclic compounds having the moiety X=C(—N<)2 in which X is O, S or —N
    • C08G12/12—Ureas; Thioureas
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C273/00—Preparation of urea or its derivatives, i.e. compounds containing any of the groups, the nitrogen atoms not being part of nitro or nitroso groups
    • C07C273/02—Preparation of urea or its derivatives, i.e. compounds containing any of the groups, the nitrogen atoms not being part of nitro or nitroso groups of urea, its salts, complexes or addition compounds
    • C07C273/025—Preparation of urea or its derivatives, i.e. compounds containing any of the groups, the nitrogen atoms not being part of nitro or nitroso groups of urea, its salts, complexes or addition compounds of solutions of urea and formaldehyde
    • 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
    • C07C45/783—Separation; Purification; Stabilisation; Use of additives by gas-liquid treatment, e.g. by gas-liquid absorption
    • 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
    • C07C45/86—Use of additives, e.g. for stabilisation

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Treating Waste Gases (AREA)
  • Phenolic Resins Or Amino Resins (AREA)

Abstract

Método de absorber formaldehido gaseoso para obtener soluciones concentradas, en el qeu se emplea como disolvente una solución acuosa de urea, siendo la proporción de urea total o formaldehido total de 1:4 a 1:10 y efectuada la absorción a un Ph de 7 a 9.
ES0245221A 1957-10-30 1958-10-29 Método para obtener soluciones concentradas Expired ES245221A1 (es)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT1549957 1957-10-30

Publications (1)

Publication Number Publication Date
ES245221A1 true ES245221A1 (es) 1959-05-01

Family

ID=11148056

Family Applications (1)

Application Number Title Priority Date Filing Date
ES0245221A Expired ES245221A1 (es) 1957-10-30 1958-10-29 Método para obtener soluciones concentradas

Country Status (6)

Country Link
US (1) US3067177A (es)
CH (1) CH398530A (es)
DE (1) DE1239290C2 (es)
ES (1) ES245221A1 (es)
GB (1) GB906120A (es)
NL (1) NL6703094A (es)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH441261A (de) * 1962-06-08 1967-08-15 Stamicarbon Verfahren zum Absorbieren von Formaldehyd aus formaldehydhaltigem Gas
US3243939A (en) * 1962-07-17 1966-04-05 Stamicarbon Process for absorbing formaldehyde from gases containing the same
NL298226A (es) * 1963-09-23
US3862221A (en) * 1967-08-02 1975-01-21 Oreal N,N{40 -di(hydroxymethylcarbamyl)cystamine
IT951962B (it) * 1971-12-27 1973-07-10 Sir Soc Italiana Resine Spa Procedimento per la preparazione di resine da urea e formaldeide
IT951964B (it) * 1971-12-27 1973-07-10 Sir Soc Italiana Resine Spa Procedimento perfezionato per la preparazione di resine da urea e formaldeide
US4065421A (en) * 1976-03-17 1977-12-27 Reichhold Chemicals, Inc. Continuous process for the production of aqueous urea-formaldehyde solutions
EP0653961B1 (en) * 1992-08-07 1996-06-19 Hydro Agri Sluiskil B.V. Process for the production of urea granules
JP3667418B2 (ja) 1996-02-01 2005-07-06 東洋エンジニアリング株式会社 粒状尿素の製造方法
GB2394956B (en) * 2002-10-18 2004-10-27 Basic Solutions Ltd A urea based granule blend for ice-melting and reducing granule caking
NL1023303C2 (nl) * 2003-04-29 2004-11-01 Dsm Nv Werkwijze voor de bereiding van een ureum- en formaldehydebevattende waterige oplossing.
NL1027314C2 (nl) * 2004-10-22 2006-04-25 Dsm Ip Assets Bv Werkwijze voor de produktie van een melamine en aldehyde bevattende waterige stroom.
AT516530B1 (de) 2014-11-20 2018-02-15 Johnson Matthey Plc Verfahren und Vorrichtung zur Herstellung einer wässrigen Lösung von Formaldehyd
CN113999358B (zh) * 2021-11-23 2024-02-06 绵阳市建诚化工有限公司 一种甲醛生产刨花板用脲醛预缩液的制备方法

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1507624A (en) * 1923-02-05 1924-09-09 Pollak Process for manufacturing condensation products
US1987601A (en) * 1932-05-26 1935-01-15 Du Pont Purification of alcohols
US2321544A (en) * 1940-05-22 1943-06-08 Du Pont Preparation of methylol urea
DE835300C (de) * 1942-01-24 1952-03-31 Glanzstoff Ag Verfahren zur Herstellung stabiler, auch nach kurzem Aufkochen noch bestaendiger, mineralsaurer Loesungen aus Formaldehyd und Harnstoff
US2467212A (en) * 1947-03-06 1949-04-12 Du Pont Liquid urea-formaldehyde compositions
GB641703A (en) * 1947-03-06 1950-08-16 Du Pont Manufacture of unpolymerized urea-formaldehyde reaction products
US2946403A (en) * 1958-08-13 1960-07-26 Borden Co Concentrated formaldehyde solution

Also Published As

Publication number Publication date
US3067177A (en) 1962-12-04
CH398530A (de) 1966-03-15
NL6703094A (es) 1967-05-25
DE1239290B (de) 1967-04-27
DE1239290C2 (de) 1976-07-01
GB906120A (en) 1962-09-19

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