KR950704272A - PROCESS FOR THE PRODUCTION OF HIGH PURITY MELAMINE - Google Patents

PROCESS FOR THE PRODUCTION OF HIGH PURITY MELAMINE

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Publication number
KR950704272A
KR950704272A KR1019950701538A KR19950701538A KR950704272A KR 950704272 A KR950704272 A KR 950704272A KR 1019950701538 A KR1019950701538 A KR 1019950701538A KR 19950701538 A KR19950701538 A KR 19950701538A KR 950704272 A KR950704272 A KR 950704272A
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KR
South Korea
Prior art keywords
melamine
mother liquor
crystals
raw
temperature
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KR1019950701538A
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Korean (ko)
Inventor
카사리노 살바토르
글라코베 프란체스코
Original Assignee
카사리노 살바토르
콘세르 에스.페.아
발렌티 퀸틸리아노
키네틱스 테크놀로지 인터내셔날 에스.페.아.
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Application filed by 카사리노 살바토르, 콘세르 에스.페.아, 발렌티 퀸틸리아노, 키네틱스 테크놀로지 인터내셔날 에스.페.아. filed Critical 카사리노 살바토르
Publication of KR950704272A publication Critical patent/KR950704272A/en

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    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07DHETEROCYCLIC COMPOUNDS
    • C07D251/00Heterocyclic compounds containing 1,3,5-triazine rings
    • C07D251/02Heterocyclic compounds containing 1,3,5-triazine rings not condensed with other rings
    • C07D251/12Heterocyclic 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
    • C07D251/26Heterocyclic 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
    • C07D251/40Nitrogen atoms
    • C07D251/54Three nitrogen atoms
    • C07D251/62Purification of melamine

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Phenolic Resins Or Amino Resins (AREA)

Abstract

고순도의 멜라민을 제조하는 개선된 방법으로서, 멜라민의 우레아로의 전환에 의해 얻어지며, 멜라민의 정제가 두개의 별도 결정화 단계를 수행된다. 제1결정화 단계를 제2결정화 단계로부터 나온 모액으로 세척되는 비가공 멜라민 결정의 제조단계로 이루어진다. 이러한 모액은 특정 처리에 의해 미리 정제된다. 제2결정단계는 최종 원심분리로부터 나오는 순환 모액으로 비가공 결정의 용해, 얻어진 용해의 여과, 재결정, 원심분리에 의한 분리 및 탈염수로의 결정 세척을 포함한다.As an improved method for producing high purity melamine, it is obtained by the conversion of melamine to urea, and the purification of melamine is carried out in two separate crystallization steps. The first crystallization step consists in preparing the raw melamine crystals which are washed with the mother liquor from the second crystallization step. This mother liquor is preliminarily purified by specific treatment. The second crystallization step includes dissolution of the raw crystals into the circulating mother liquor from the final centrifugation, filtration of the resulting dissolution, recrystallization, separation by centrifugation and crystal washing with demineralized water.

Description

고순도 멜라밀의 제조방법(PROCESS FOR PRODUCTION OF HIGH PURITY MELAMINE)PROCESS FOR PRODUCTION OF HIGH PURITY MELAMINE

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.

제1도 및 제2도는 1차 결정화 단계 및 최종 결정단계를 나타내는 블록도이다.1 and 2 are block diagrams showing the first crystallization step and the final crystallization step.

Claims (12)

생성물의 정제가 두개의 다른 결정화 단계로 수행되며, 제1단계에서 결정을 정제처리를 조건으로 최종원심분리로 부터 나온 모액 분율에 의해 세척하는 것을 특징으로 하는 암모니아에서의 요소반응으로부터 유도되는 고순도 멜라민의 제조방법.Purification of the product is carried out in two different crystallization steps, in which the crystals are washed in the first step by the mother liquor fraction from the final centrifugation under purification conditions, resulting in high purity melamine derived from urea reaction in ammonia. Manufacturing method. 제1항에 있어서, 반응 용리액으로부터의 멜라민의 회수가 멜라민이 완전히 용해될때 암모니아 용액으로 반응 생성물을 세척하여 수행되는 것을 특징으로 하는 고순도 멜라민 제조방법.The method of claim 1, wherein the recovery of melamine from the reaction eluent is carried out by washing the reaction product with an ammonia solution when the melamine is completely dissolved. 제1항 또는 제2항에 있어서, 암모니아 용액이 비가공 멜라민 결정을 얻기 위하여 연속적으로 대부분의 불순물을 제거하여 여과되고, 결정화되며, 원심분리되는 것을 특징으로 하는 고순도 멜라민 제조방법.The method for producing high purity melamine according to claim 1 or 2, wherein the ammonia solution is filtered, crystallized and centrifuged to remove most impurities in order to obtain raw melamine crystals. 제1항 내지 3항 중 어느 한 항에 있어서, 원료 멜라민 결정이 최종 원심분리로부터 나오며 활성탄 처리에 의해 정제되는 모액 분율에 의해 세척되는 것을 특징으로 하는 고순도 멜라민 제조방법.4. The method of any one of claims 1 to 3, wherein the raw melamine crystals are washed by the mother liquor fraction coming from the final centrifugation and purified by activated charcoal treatment. 제1항 내지 제4항 중 어느 한 항에 있어서, 활성탄에 의한 정제 처리 온도가 60 내지 80℃, 바람직하게는 최종 멜라민 결정화 단계내의 조작온도보다 20℃ 높은 것을 특징으로 하는 고순도 멜라민 제조방법.Method according to any one of the preceding claims, characterized in that the purification treatment temperature with activated charcoal is 60 to 80 ° C, preferably 20 ° C higher than the operating temperature in the final melamine crystallization step. 제1항 내지 5항중 어느 한 항에 있어서, 비가공 멜라민 결정이 80 내지 100℃ 사이의 온도에서 생성물의 최종 원심분리로 부터 유도되는 모액 용액으로 용해되는 것을 특징으로 하는 고순도 멜라민 제조방법.The method of claim 1, wherein the raw melamine crystals are dissolved in a mother liquor solution derived from the final centrifugation of the product at a temperature between 80 and 100 ° C. 7. 제1항 내지 6항 중 어느 한 항에 있어서, 비가공 멜라민 결정을 용해시킴으로써 얻어지는 용액이 여과되고, 용해온도보다 상당히 낮은 온도에서 조작하고, 결정화 용리액이 탈염수에서 세척되는 멜라민 결정으로부터의 모액을 분리하기 위하여 원심분리기 또는 분리기 어셈블리로 공급되는 하나 이상의 결정으로 일렬로 보내지는 것을 특징으로 하는 고순도 멜라민 제조방법.The mother liquor according to any one of claims 1 to 6, wherein the solution obtained by dissolving the raw melamine crystals is filtered, operated at a temperature significantly lower than the dissolution temperature, and the mother liquor is separated from the melamine crystals in which the crystallization eluate is washed in demineralized water. High purity melamine production method characterized in that it is sent in line with one or more crystals supplied to the centrifuge or separator assembly. 제1항 내지 7항 중 어느 한 항에 있어서, 비가공 원료 결정을 세척하기 위해 사용되는 모액이 90℃ 이하의 온도 및 바람직하게는 60 내지 80℃의 온도에서 비가공 멜라민의 중량에 0.3 내지 3배의 속도로 공급되는 것을 특징으로 하는 고순도 멜라민 제조방법.8. The mother liquor according to any one of claims 1 to 7, wherein the mother liquor used for washing the raw raw material crystals is 0.3 to 3 by weight of the raw melamine at a temperature of 90 ° C or lower and preferably 60 to 80 ° C. Method for producing high purity melamine, characterized in that is supplied at the speed of the ship. 우레아 및 암모니아로부터의 기체 반응 생성물로부터 극소량의 불순물을 가진 모액으로부터 결정화하여 멜라민을 회수 및 정제하는 방법으로서, (a) 멜라민을 완전히 용해시키기에 충분한 량의 1차 결정화로부터 나온 모액에 의해 반응 기체로부터 멜라민을 응축시키는 단게, (b) 여과(1차 여과)에 의해 불용성 불순물을 제거하는 단계, (c) 1차 결정화 단계, (d) 최종 결정화로부터 정제 모액으로 비가공 결정을 세척하면서 1차 원심분리하는 단계, (e) 최종 원심분리로부터 회수된 모액에서 비가공 멜라민을 용해시키는 단계, (f) 제2여과 단계, (g) 최종 결정화 단계, (u) 탈염수에 의해 생성물 결정을 세척하면서 최종 원심분리하는 단계, (k) 생성 물을 건조시키는 단계, 및 (j) 1차 원심분리 단계(d) 이후에 비가공 멜라민 결정을 세척하도록 모액 분율을 정제 처리하면서 용해 용기로 대부분의 모액을 순환시키는 단계를 포함하는 것을 특징으로 하는 멜라민 회수 및 정제방법.A method for recovering and purifying melamine by crystallizing from a mother liquor with a very small amount of impurities from gaseous reaction products from urea and ammonia, which comprises: (a) from the reaction gas with Condensing the melamine, (b) removing insoluble impurities by filtration (primary filtration), (c) primary crystallization step, (d) primary centrifugation while washing the raw crystals from the final crystallization with purified mother liquor Separating (e) dissolving the raw melamine in the mother liquor recovered from the final centrifugation, (f) the second filtration step, (g) the final crystallization step, and (u) the product crystals by washing with demineralized water. The mother liquor fraction is purified to wash the raw melamine crystals after centrifugation, (k) drying the product, and (j) primary centrifugation (d). And melamine recovery and purification method comprising the step of circulating the majority of the mother liquor to the dissolving vessel. 제9항에 있어서, 1차 결정화 단계의 비가공 멜라민 결정이 정제공정에 부가되는 멜라민 중량의 0.3 내지 3배의 속도로 90℃ 이하, 바람직하게는 60℃ 내지 80℃의 온도에서 0.3 내지 3배의 속도로 정제된 모액의 스트림으로 세척되는 것을 특징으로 하는 멜라민 회수 및 정제방법.10. The process according to claim 9, wherein the raw melamine crystals of the first crystallization step are 0.3 to 3 times at a temperature of 90 ° C. or less, preferably 60 ° C. to 80 ° C., at a rate of 0.3 to 3 times the weight of melamine added to the purification process. Melamine recovery and purification method characterized in that it is washed with a stream of purified mother liquor at the rate of. 제9항 또는 10항에 있어서, 비가공 멜라민 결정을 세척하는데 사용되는 모액 분율을 정제 처리가 60 내지 80℃, 바람직하게는 활성탄이 비가공 멜라민 결정을 세척하기 위하여 상기 모액에 첨가되는 멜라민의 최종 결정화의 조작온도보다 20℃ 이상의 온도에서 활성탄에 의해 처리되는 것으로 이루어지는 것을 특징으로 하는 멜라민 회수 및 정제방법.11. The final solution of melamine according to claim 9 or 10, wherein the mother liquor fraction used to wash the raw melamine crystals is purified to 60-80 ° C, preferably activated carbon is added to the mother liquor to wash the raw melamine crystals. Melamine recovery and purification method comprising the treatment with activated carbon at a temperature of 20 ℃ or more than the operation temperature of the crystallization. 제9항 내지 11항중 어느 한 항에 있어서, 비가공 멜라민의 용해가 생성물의 최종 원심분리로부터 얻어지는 모액에 의해 80내지 100℃의 온도로 수행되는 것을 특징으로 하는 멜라민 회수 및 정제방법.12. Melamine recovery and purification method according to any one of claims 9 to 11, wherein the dissolution of the raw melamine is carried out at a temperature of 80 to 100 ° C with the mother liquor obtained from the final centrifugation of the product. ※ 참고사항:최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019950701538A 1993-08-23 1994-08-23 PROCESS FOR THE PRODUCTION OF HIGH PURITY MELAMINE KR950704272A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
ITRM93A000568 1993-08-23
ITRM930568A IT1261841B (en) 1993-08-23 1993-08-23 PROCEDURE FOR THE PRODUCTION OF HIGH PURITY MELAMINE.
PCT/IT1994/000139 WO1995006042A1 (en) 1993-08-23 1994-08-23 Process for the production of high purity melamine

Publications (1)

Publication Number Publication Date
KR950704272A true KR950704272A (en) 1995-11-17

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ID=11401924

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Application Number Title Priority Date Filing Date
KR1019950701538A KR950704272A (en) 1993-08-23 1994-08-23 PROCESS FOR THE PRODUCTION OF HIGH PURITY 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
IT1261841B (en) 1996-06-03
AU7508194A (en) 1995-03-21
ITRM930568A1 (en) 1995-02-23
ITRM930568A0 (en) 1993-08-23
JPH08502760A (en) 1996-03-26
EP0665838A1 (en) 1995-08-09
WO1995006042A1 (en) 1995-03-02
RU95109943A (en) 1997-03-20
CN1113656A (en) 1995-12-20

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