RU95109943A - Method of preparing melamine of high purity, method of extraction and purification of melamine - Google Patents

Method of preparing melamine of high purity, method of extraction and purification of melamine

Info

Publication number
RU95109943A
RU95109943A RU95109943/04A RU95109943A RU95109943A RU 95109943 A RU95109943 A RU 95109943A RU 95109943/04 A RU95109943/04 A RU 95109943/04A RU 95109943 A RU95109943 A RU 95109943A RU 95109943 A RU95109943 A RU 95109943A
Authority
RU
Russia
Prior art keywords
melamine
crystallization
crystals
stage
preparing
Prior art date
Application number
RU95109943/04A
Other languages
Russian (ru)
Inventor
Кассарино Сальваторе
It]
Джакоббе Франческо
Original Assignee
Консер С.п.А. (IT)
Консер С.п.А.
Кинетикс Текнолоджи Интернэшнл С.п.А. (IT)
Кинетикс Текнолоджи Интернэшнл С.п.А.
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 Консер С.п.А. (IT), Консер С.п.А., Кинетикс Текнолоджи Интернэшнл С.п.А. (IT), Кинетикс Текнолоджи Интернэшнл С.п.А. filed Critical Консер С.п.А. (IT)
Publication of RU95109943A publication Critical patent/RU95109943A/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)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Phenolic Resins Or Amino Resins (AREA)

Abstract

FIELD: chemical technology. SUBSTANCE: melamine is prepared by urea conversion and melamine purification is carried out for two different crystallization stages. The first stage of crystallization involves preparing crude melamine crystals that were washed with mother liquid feeding after the second stage of crystallization. This mother liquid is purified preliminary by special treatment. The second crystallization stage involves dissolving crude crystals with recycling mother liquid feeding from the terminal centrifugation, filtration of the obtained solution, recrystallization, separation by centrifugation and crystals washing with demineralized water. EFFECT: improved method of melamine preparing.

Claims (1)

Предложен улучшенный способ получения меламина высокой чистоты, где меламин получается превращением мочевины, а очистка меламина осуществляется в две различные стадии кристаллизации. Первая стадия кристаллизации состоит из получения серых (неочищенных) кристаллов меламина, которые промываются маточным раствором, поступающим с второй стадии кристаллизации. Этот маточный раствор предварительно очищается с помощью специальной обработки. Вторая стадия кристаллизации включает растворение сырых кристаллов рециклируемым маточным раствором, поступающим с конечного центрифугирования, фильтрацию полученного раствора, перекристаллизацию, сепарацию центрифугированием и промывку кристаллов деминерализованной водой.An improved method for producing high purity melamine is proposed, where melamine is obtained by the conversion of urea, and melamine is purified in two different crystallization stages. The first stage of crystallization consists of obtaining gray (crude) melamine crystals, which are washed with the mother liquor coming from the second stage of crystallization. This mother liquor is pre-purified using a special treatment. The second crystallization step involves dissolving the crude crystals with a recyclable mother liquor coming from final centrifugation, filtering the resulting solution, recrystallizing, centrifuging separation and washing the crystals with demineralized water.
RU95109943/04A 1993-08-23 1994-08-23 Method of preparing melamine of high purity, method of extraction and purification of melamine RU95109943A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITRM930568A IT1261841B (en) 1993-08-23 1993-08-23 PROCEDURE FOR THE PRODUCTION OF HIGH PURITY MELAMINE.
ITRM93A000568 1993-08-23

Publications (1)

Publication Number Publication Date
RU95109943A true RU95109943A (en) 1997-03-20

Family

ID=11401924

Family Applications (1)

Application Number Title Priority Date Filing Date
RU95109943/04A RU95109943A (en) 1993-08-23 1994-08-23 Method of preparing melamine of high purity, method of extraction and purification of melamine

Country Status (8)

Country Link
EP (1) EP0665838A1 (en)
JP (1) JPH08502760A (en)
KR (1) KR950704272A (en)
CN (1) CN1113656A (en)
AU (1) AU7508194A (en)
IT (1) IT1261841B (en)
RU (1) RU95109943A (en)
WO (1) WO1995006042A1 (en)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5874660A (en) * 1995-10-04 1999-02-23 Exxon Production Research Company Method for inhibiting hydrate formation
US5744665A (en) * 1995-06-08 1998-04-28 Exxon Production Research Company Maleimide copolymers and method for inhibiting hydrate formation
NL1003105C2 (en) * 1996-05-14 1997-11-18 Dsm Nv Process for the preparation of melamine.
NL1008571C2 (en) * 1998-03-12 1999-07-28 Dsm Nv Crystalline melamine.
NL1008912C2 (en) * 1998-04-17 1999-10-19 Dsm Nv Method of drying melamine.
IT1315255B1 (en) 1999-11-16 2003-02-03 Eurotecnica Dev And Licensing MELAMINE PURIFICATION PROCESS.
IT1315265B1 (en) * 1999-12-22 2003-02-03 Eurotecnica Dev And Licensing PROCESS FOR THE PRODUCTION WITH OTHER HIGH-PURITY MELAMINE YIELDS
DE102005021802A1 (en) * 2005-05-04 2006-11-09 Ami-Agrolinz Melamine International Gmbh Process and apparatus for the crystallization of melamine
EP2098516A1 (en) * 2008-03-04 2009-09-09 Urea Casale S.A. Process for the production of high purity melamine from urea
ITMI20080861A1 (en) * 2008-05-13 2009-11-14 Eurotecnica Melamine Luxembourg IMPROVED PROCESS FOR THE PURIFICATION OF MELAMINE AND ITS EQUIPMENT
CN104788394B (en) * 2015-04-14 2017-09-01 四川金象赛瑞化工股份有限公司 A kind of melamine process for purification
CN115181070A (en) * 2022-08-10 2022-10-14 宁波中科远东催化工程技术有限公司 Method for producing melamine

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL161750C (en) * 1968-11-16 1980-03-17 Stamicarbon Process for separating melamine from a gaseous reaction mixture of melamine, ammonia and carbon dioxide.
NL8201479A (en) * 1982-04-07 1983-11-01 Stamicarbon METHOD FOR PREPARING MELAMINE.

Also Published As

Publication number Publication date
ITRM930568A0 (en) 1993-08-23
WO1995006042A1 (en) 1995-03-02
AU7508194A (en) 1995-03-21
KR950704272A (en) 1995-11-17
JPH08502760A (en) 1996-03-26
CN1113656A (en) 1995-12-20
EP0665838A1 (en) 1995-08-09
ITRM930568A1 (en) 1995-02-23
IT1261841B (en) 1996-06-03

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