AR071539A1 - IMPROVED PROCEDURE FOR THE TREATMENT OF RETAINED IN A MELAMINE PRODUCTION PLANT - Google Patents

IMPROVED PROCEDURE FOR THE TREATMENT OF RETAINED IN A MELAMINE PRODUCTION PLANT

Info

Publication number
AR071539A1
AR071539A1 ARP080102938A AR071539A1 AR 071539 A1 AR071539 A1 AR 071539A1 AR P080102938 A ARP080102938 A AR P080102938A AR 071539 A1 AR071539 A1 AR 071539A1
Authority
AR
Argentina
Prior art keywords
melamine
treatment
retention
oats
phase
Prior art date
Application number
Other languages
Spanish (es)
Inventor
Sergio Noe
Roberto Santucci
Giovanni Morello
Original Assignee
Eurotecnica Melamine Luxemburg
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 Eurotecnica Melamine Luxemburg filed Critical Eurotecnica Melamine Luxemburg
Publication of AR071539A1 publication Critical patent/AR071539A1/en

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D251/00—Heterocyclic compounds containing 1,3,5-triazine rings
    • C07D251/02—Heterocyclic compounds containing 1,3,5-triazine rings not condensed with other rings
    • C07D251/12—Heterocyclic compounds containing 1,3,5-triazine rings not condensed with other rings having three double bonds between ring members or between ring members and non-ring members
    • C07D251/26—Heterocyclic compounds containing 1,3,5-triazine rings not condensed with other rings having three double bonds between ring members or between ring members and non-ring members with only hetero atoms directly attached to ring carbon atoms
    • C07D251/40—Nitrogen atoms
    • C07D251/54—Three nitrogen atoms
    • C07D251/62—Purification of melamine

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Fertilizers (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Preparation Of Fruits And Vegetables (AREA)

Abstract

Se describe un procedimiento para aumentar la eficacia y el rendimiento general del proceso de síntesis de melamina a través del tratamiento del líquido madre de cristalizacion de melamina desamoniado y neutralizado, caracterizado porque comprende las siguientes fases operativas: a) someter la corriente de dicho líquido madre que contiene OATs y melamina a una o más etapas de ultrafiltracion, con la produccion de: (i) un permeado compuesto por una solucion acuosa que contiene melamina y la unica fraccion soluble de OATs, y (ii) un retenido compuesto por una suspension acuosa coloidal concentrada que comprende la fraccion de OATs en exceso con respecto a la fraccion soluble; el fin de la etapa a) es reducir al mínimo el volumen de retenido obtenido; b) someter el retenido obtenida en la fase a) a un tratamiento de descomposicion por hidrolisis a una temperatura que oscila entre 270°C y 300°C, con la formacion de una corriente gaseosa compuesta por NH3, CO2 y vapor de agua, y una corriente líquida; dicho retenido que sale de la fase a) es llevado a la temperatura del tratamiento de descomposicion mezclándolo con una corriente acuosa que tiene una temperatura tal que la corriente resultante del mezclado tiene una temperatura que oscila entre 270°C y 300°C; c) someter la corriente líquida que proviene de la fase b) a un tratamiento de extraccion con la separacion de otra corriente gaseosa compuesta por NH3, CO2 y vapor de agua, y una corriente líquida sustancialmente libre de compuestos orgánicos.A procedure for increasing the efficiency and overall performance of the melamine synthesis process through the treatment of the deammoniated and neutralized melamine crystallization liquid is described, characterized in that it comprises the following operational phases: a) subjecting the current of said mother liquid containing OATs and melamine at one or more ultrafiltration stages, with the production of: (i) a permeate composed of an aqueous solution containing melamine and the only soluble fraction of OATs, and (ii) a retention composed of an aqueous suspension concentrated colloidal comprising the fraction of OATs in excess with respect to the soluble fraction; the purpose of step a) is to minimize the volume of retention obtained; b) subject the retention obtained in phase a) to a hydrolysis decomposition treatment at a temperature ranging from 270 ° C to 300 ° C, with the formation of a gas stream composed of NH3, CO2 and water vapor, and a liquid stream; said retention that leaves phase a) is brought to the temperature of the decomposition treatment by mixing it with an aqueous current having a temperature such that the current resulting from mixing has a temperature ranging from 270 ° C to 300 ° C; c) subjecting the liquid stream that comes from phase b) to an extraction treatment with the separation of another gaseous stream composed of NH3, CO2 and water vapor, and a liquid stream substantially free of organic compounds.

ARP080102938 2007-07-09 2008-07-08 IMPROVED PROCEDURE FOR THE TREATMENT OF RETAINED IN A MELAMINE PRODUCTION PLANT AR071539A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITMI20071363 ITMI20071363A1 (en) 2007-07-09 2007-07-09 IMPROVED PROCESS FOR RETENTED TREATMENT IN A MELAMINE PRODUCTION PLANT

Publications (1)

Publication Number Publication Date
AR071539A1 true AR071539A1 (en) 2010-06-30

Family

ID=39884702

Family Applications (1)

Application Number Title Priority Date Filing Date
ARP080102938 AR071539A1 (en) 2007-07-09 2008-07-08 IMPROVED PROCEDURE FOR THE TREATMENT OF RETAINED IN A MELAMINE PRODUCTION PLANT

Country Status (4)

Country Link
AR (1) AR071539A1 (en)
IT (1) ITMI20071363A1 (en)
TW (1) TW200911764A (en)
WO (1) WO2009007813A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2308856A1 (en) * 2009-10-09 2011-04-13 Borealis Agrolinz Melamine GmbH Water recycling in a melamine production process
CN102633736B (en) * 2012-04-06 2014-05-07 山东大学 Method for synthesizing cyanic acid or melamine by utilizing ammonia gas and carbon dioxide
RU2544704C1 (en) 2013-10-28 2015-03-20 Открытое Акционерное Общество "Научно-Исследовательский И Проектный Институт Карбамида И Продуктов Органического Синтеза" (Оао Ниик) Method of purifying sewage waters of melamine production

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1315265B1 (en) * 1999-12-22 2003-02-03 Eurotecnica Dev And Licensing PROCESS FOR THE PRODUCTION WITH OTHER HIGH-PURITY MELAMINE YIELDS
ITMI20060759A1 (en) * 2006-04-14 2007-10-15 Eurotecnica Melamine Luxemburg IMPROVED PROCESS FOR THE PRODUCTION OF MELAMINE WITH INCREASE OF YIELD

Also Published As

Publication number Publication date
TW200911764A (en) 2009-03-16
ITMI20071363A1 (en) 2009-01-10
WO2009007813A1 (en) 2009-01-15

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