KR850005425A - Anhydrous high pressure melamine synthesis method - Google Patents

Anhydrous high pressure melamine synthesis method Download PDF

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KR850005425A
KR850005425A KR1019840008590A KR840008590A KR850005425A KR 850005425 A KR850005425 A KR 850005425A KR 1019840008590 A KR1019840008590 A KR 1019840008590A KR 840008590 A KR840008590 A KR 840008590A KR 850005425 A KR850005425 A KR 850005425A
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melamine
liquid
product
temperature
unit
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KR1019840008590A
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Korean (ko)
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KR920001740B1 (en
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에드워어드 토마스 로저 (외 1)
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로저 이이 토마스
멜러마인 케미칼즈 인코포레이팃드
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J3/00—Processes of utilising sub-atmospheric or super-atmospheric pressure to effect chemical or physical change of matter; Apparatus therefor
    • B01J3/04—Pressure vessels, e.g. autoclaves
    • B01J3/042—Pressure vessels, e.g. autoclaves in the form of a tube
    • 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
    • C07D251/56—Preparation of melamine
    • C07D251/60—Preparation of melamine from urea or from carbon dioxide and ammonia

Abstract

내용 없음No content

Description

무수고압멜라민 합성법Anhydrous high pressure melamine synthesis method

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음As this is a public information case, the full text was not included.

제2도는 요소로부터 멜라민 생성물을 제조하는 본 발명에 따른 완전한 플랜트 시스템의 생산공정순서도이다.2 is a flow chart of the production process of a complete plant system according to the invention for producing melamine products from urea.

제3도는 본 발명에 따라 사용하기 적합한 세척유니트를 나타낸 부분적으로 절단된 부분 단면도 이다.3 is a partially cut, partial cross-sectional view showing a cleaning unit suitable for use in accordance with the present invention.

제4도는 본 발명에 사용하기 적합한 반응탑을 나타낸 부분적으로 절단된 부분 단면도이다.4 is a partially cut, partial cross-sectional view showing a reaction tower suitable for use in the present invention.

도면의 주요부분에 대한 부호의 설명Explanation of symbols for main parts of the drawings

22 : 세척탑 24 : 분리탑 29 : 반응탑 38 : 생성물 냉각 유니트22 washing tower 24 separation column 29 reaction column 38 product cooling unit

46 : 탱크46 tank

Claims (6)

요소를 압력 약 1500-2500 psig, 온도 약 354℃하의 반응탑내에서 열분해하여 액체 멜라민, CO2및 NH3를 함유하는 반응생성물을 생성한후 ; 상기 반응 생성물을 가압하게 혼합류로서 분리탑 유니트내로 보내고; 상기 분리탑 유니트를 상기 반응탑에서와 실질적으로 동일한 압력 및 온도하에 유지시키고; 상기 반응 생성물을 상기 분리탑 유니트 내에서 멜라민 증기를 함유하는 CO2와 NH3배기가스와 액체 멜라민으로 분리함과 동시에(a) 상기 멜라민을 함유하는 CO2와 NH3배기가스는 상기 분리탑 유니트의 압력 및 온도와 실질적으로 같은 온도 및 압력에서 상기 세척탑 유니트로 보내고 상기 배기가스를 상기 요소를 예열하고, 상기 배기가스를 냉각하기 위해 용융요소롤 세척해 주어 그로부터 상기 멜라민을 제거한후 상기 세척탑 유니트로부터 NH3와 CO2배기가스를 약 177-232℃에서 제거하고 상기 멜라민을 함유하는 상기 예열된 용융요소를 상기 반응탑내로 공급해주고 (b) 상기 액체멜라민은 생성물 냉각 유니트로 보낸후; 감압하고 상기 액체 멜라민을 상기 생성물 냉각 유니트에서 액체 매체로 급냉하여 세척이나 또 다른 정제단계 없이 통상적으로 유용한 멜라민 생성물을 생성하는 것으로 구성된 요소로부터 멜라민을 제조하는 연속법.Urea was pyrolyzed in a reaction column at a pressure of about 1500-2500 psig and a temperature of about 354 ° C. to produce a reaction product containing liquid melamine, CO 2 and NH 3 ; Directing the reaction product into the separation tower unit as a mixed flow to pressurize; Maintaining the separation tower unit under substantially the same pressure and temperature as in the reaction column; The reaction product separates the melamine vapor into CO 2 and NH 3 exhaust gas and liquid melamine in the separation tower unit, and (a) the melamine-containing CO 2 and NH 3 exhaust gas is separated into the separation tower unit. To the washing tower unit at a temperature and pressure substantially equal to the pressure and temperature of the exhaust gas, preheating the urea, and washing the molten urea to cool the exhaust gas to remove the melamine therefrom. Removing NH 3 and CO 2 exhaust gas from the unit at about 177-232 ° C. and feeding the preheated molten element containing the melamine into the reaction tower and (b) the liquid melamine was sent to a product cooling unit; A continuous process for producing melamine from urea consisting of depressurizing and quenching the liquid melamine with liquid medium in the product cooling unit to produce typically useful melamine product without washing or another purification step. 제1항에 있어서, 상기 반응탑은 압력 1700-2200 psig 및 온도 371-427℃하에 있으며, 상기 기체분리탑은 실질적으로 상기 반응탑과 동일한 압력 및 온도하에 유지시키며 상기 세척탑은 상기 반응탑과 실질적으로 동일한 압력 및 177-193℃ 온도하에 유지시키며; 생성물 냉각 유니트는 약 200-600 psig 및 약 49-110℃ 온도하에 유지시키며; 상기 액체 멜라민을 급냉해주는 상기 액체는 무수액체 암모니아이며 상기 고체 멜라민 생성물이 97.5-99.5%의 순도를 가지며 0.75%이하의 멜람과 멜렘을 함유하는 방법.The reaction tower of claim 1, wherein the reaction tower is at a pressure of 1700-2200 psig and a temperature of 371-427 ° C., the gas separation tower is maintained at substantially the same pressure and temperature as the reaction tower, and the washing tower is connected to the reaction tower. Maintained under substantially the same pressure and at 177-193 ° C. temperature; The product cooling unit is maintained at about 200-600 psig and about 49-110 ° C. temperature; Said liquid melamine quenching liquid melamine is anhydrous liquid ammonia and said solid melamine product has a purity of 97.5-99.5% and contains less than 0.75% of melam and melem. 반응탑 유니트, 분리탑 유니트 : 세척탑 유니트 및 생성물냉각 유니트를 그 필수 구성요소로 갖고 있는 플랜트 시템에서 ; 상기 반응탑유니트는 상기 반응탑을 354-427℃ 온도로 가열하고 유지시키는 장치; 상기 유니트를 약 1500-2500psig 로 가압하고 요소를 열분해하여 액체멜라민, CO2및 NH3를 생성하는 장치 및 상기 온도 및 압력조건하에 액체멜라민, CO2및 NH3를 혼합류로서 상기 분리탑 유니트내로 연속해서 보내는 장치를 포함하며; 상기 분리탑 유니트는 상기 분리탑을 상기 반응탑과 실질적으로 동일한 온도 및 압력하에 유지시키는 장치; 상기 온도 및 압력조건하에 액체멜라민, NH3및 CO2로된 상기 흐름을 수납하고 분리하는 장치 ; 멜라민 증기를 함유하는 CO2및 NH3배기가스를 상기 세척탑 내로 연속적으로 보내는 장치 및 상기 액체 멜라민을 상기 생성물 냉각 유니트 내로 연속적으로 보내는 장치를 포함하며; 상기 세척탑 유니트는 용융요소를 수납하는 장치; 상기 분리탑 유니트의 온도 및 압력하에 상기 분리탑 유니트로부터 상기 멜라민을 함유하는 배기가스를 수납하는장치; 상기 용융요소를 멜라민을 함유하는 상기 배기가스와 접촉시켜 상기 CO2및 NH3로 부터 멜라민을 세척하고 상기 요소를 예열하는 장치 및 상기 세척된 멜라민을 함유하는 상기 용융요소를 상기 반응기내로 연속적으로 보내는 장치를 포함하며; 상기 생성물 냉각 유니트는 상기 액체멜라민을 상기 분리탑 유니트로부터 수납하는 장치; 감합하고 상기 액체멜라민을 액체매체로 급냉하며 상기 멜라민을 세척이나 또 다른 정제없이 멜라민 함량 약 96-99.5%인 고체로서 수집하는 장치를 포함하는; 요소로부터 멜라민을 제조하는 플랜트시스템.Reaction Tower Unit, Separation Tower Unit: In plant systems with washing tower unit and product cooling unit as essential components; The reaction tower unit is a device for heating and maintaining the reaction tower at a temperature of 354-427 ℃; The unit is about to 1500-2500psig the pressure in the thermal decomposition an element liquid melamine, CO 2 and NH mixed flow of liquid melamine, CO 2 and NH 3 under the device and the conditions of temperature and pressure to generate a third into the separating column units A device for sending continuously; The separation tower unit may be configured to maintain the separation tower at substantially the same temperature and pressure as the reaction tower; A device for receiving and separating said flow of liquid melamine, NH 3 and CO 2 under said temperature and pressure conditions; A device for continuously sending CO 2 and NH 3 exhaust gas containing melamine vapor into the washing tower and a device for continuously sending the liquid melamine into the product cooling unit; The washing tower unit includes a device for receiving the melting element; An apparatus for receiving the exhaust gas containing the melamine from the separation tower unit under the temperature and pressure of the separation tower unit; A device for washing melamine from the CO 2 and NH 3 and preheating the urea by contacting the molten element with the exhaust gas containing melamine and the molten element containing the washed melamine continuously into the reactor A sending device; The product cooling unit includes a device for receiving the liquid melamine from the separation tower unit; Fitting the device and quenching the liquid melamine with a liquid medium and collecting the melamine as a solid having a melamine content of about 96-99.5% without washing or another purification; Plant system for producing melamine from urea. 제3항에 있어서, 상기 생성물 냉각 유니트는 그 한쪽 말단에 밸브장치를 갖고 있는 가압 생성물 수집 탱크를 포함하며; 상기 액체 멜라민은 상기 밸브장치를 통해 상기 탱크내 수납되며; 상기 수집탱크는 배출말단을 더 포함하며 상기 배출말단은 밸브장치와 상기 밸브장치와 함께 설치배열된 생성물 수평지시기를 포함하며; 상기 탱크가 적어도 약 2-8피트의 고체멜라민 생성물 헤드와 상기 수평 지시기에 따라 반응하여 수집탱크로부터 분말멜라민을 연속적으로 제거해주는 상기 수평 지시기와 함께 밸브장치를 자동 조절해주는 장치를 함유하고 있는 그런 플랜트시스템.4. The apparatus of claim 3, wherein the product cooling unit comprises a pressurized product collection tank having a valve device at one end thereof; The liquid melamine is received in the tank via the valve device; The collection tank further comprises a discharge end, wherein the discharge end includes a valve device and a product horizontal indicator installed and arranged with the valve device; The plant contains a device for automatically regulating a valve arrangement with the horizontal indicator which reacts with at least about 2-8 feet of solid melamine product head and the level indicator to continuously remove powdered melamine from the collection tank. system. 요소를 액체 암모니아와 접촉시켜 고체멜라민 생성물을 얻고 상기 멜라민 생성물을 또 다른 세척이나 정제없이 멜라민 함량이 약 96-99.5%이며 멜렘과 멜렘을 약 1.5%이하 함유하는 고체로서 회수함을 특징으로하는 요소를 열분해하여 NH3,CO2및 멜라민을 제조하는 멜라민 생성물의 연속제조법.Urea is contacted with liquid ammonia to obtain a solid melamine product and the melamine product is recovered as a solid with a melamine content of about 96-99.5% and containing less than about 1.5% of melem and melem without further washing or purification. Process for continuous production of melamine products to pyrolyze to produce NH 3 , CO 2 and melamine. 제5항에 있어서, 상기 요소가 약 371-427℃, 약 1700-2200 psig하에 유지된 반응기 내에서 열분해되며; 상기 멜라민이 액체이며; 상기 액체멜라민을 액체 암모니아로 급냉하는 조작이 약 200-600 psig, 온도 약 49-110℃에서 수평되며; 상기 고체멜라민 생성물이 멜라민 함량이 97.5-99%인 순도를 가지고 있으며 멜렘 또는 멜람을 약 0.752%이하 함유하고 있는 방법.The process of claim 5, wherein the urea is pyrolyzed in a reactor maintained at about 371-427 ° C. and about 1700-2200 psig; The melamine is a liquid; Quenching the liquid melamine with liquid ammonia is horizontal at about 200-600 psig, temperature about 49-110 ° C .; Wherein said solid melamine product has a melamine content of 97.5-99% purity and contains less than about 0.752% of melem or melam. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019840008590A 1984-01-05 1984-12-31 A continuous process for producing melamine and a plant-system for producing melamine KR920001740B1 (en)

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US56840884A 1984-01-05 1984-01-05
US568,408 1984-01-05

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KR (1) KR920001740B1 (en)
AT (1) AT393124B (en)
AU (1) AU568469B2 (en)
BR (1) BR8500032A (en)
CA (1) CA1220476A (en)
EG (1) EG16900A (en)
ES (1) ES8606303A1 (en)
FR (1) FR2557876B1 (en)
GB (1) GB2152505B (en)
IE (1) IE57911B1 (en)
IT (1) IT1188084B (en)
MX (1) MX164901B (en)
NL (1) NL193832C (en)
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US5514796A (en) * 1995-06-07 1996-05-07 Melamine Chemicals, Inc. Melamine of improved purity produced by high-pressure, non-catalytic process
NL1002669C2 (en) * 1996-03-21 1997-09-23 Dsm Nv Process for the preparation of melamine.
NL1003105C2 (en) * 1996-05-14 1997-11-18 Dsm Nv Process for the preparation of melamine.
NL1003328C2 (en) * 1996-06-13 1997-12-17 Dsm Nv Process for preparing melamine.
NL1003709C2 (en) * 1996-07-30 1998-02-05 Dsm Nv Process for preparing melamine.
NL1004814C2 (en) * 1996-12-18 1998-06-19 Dsm Nv High purity, white coloured melamine preparation from urea
AU5346298A (en) * 1996-12-16 1998-07-15 Dsm N.V. Method for the preparation of melamine
NL1008571C2 (en) * 1998-03-12 1999-07-28 Dsm Nv Crystalline melamine.

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DE1670286A1 (en) * 1967-11-11 1971-01-28 Basf Ag Process for processing the waste gases produced during melamine synthesis
GB1218522A (en) * 1969-01-24 1971-01-06 Nissan Chemical Ind Ltd A process for recovering the purified melamine
NL7903473A (en) * 1979-05-03 1980-11-05 Stamicarbon METHOD FOR PREPARING MELAMINE.
NL8201479A (en) * 1982-04-07 1983-11-01 Stamicarbon METHOD FOR PREPARING MELAMINE.

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ATA2185A (en) 1991-01-15
JPH0925271A (en) 1997-01-28
BR8500032A (en) 1985-08-13
JPH0557984B2 (en) 1993-08-25
MX164901B (en) 1992-09-30
ES539126A0 (en) 1986-04-16
GB2152505A (en) 1985-08-07
JP2757163B2 (en) 1998-05-25
NL8403843A (en) 1985-08-01
IT8583302A0 (en) 1985-01-04
NL193832B (en) 2000-08-01
NO176795C (en) 1995-05-31
IE843247L (en) 1985-07-05
FR2557876A1 (en) 1985-07-12
GB8500197D0 (en) 1985-02-13
IE57911B1 (en) 1993-05-19
ES8606303A1 (en) 1986-04-16
AU568469B2 (en) 1987-12-24
FR2557876B1 (en) 1991-04-19
IT1188084B (en) 1987-12-30
JPS60208970A (en) 1985-10-21
AU3737685A (en) 1985-07-18
EG16900A (en) 1990-10-30
CA1220476A (en) 1987-04-14
NO845248L (en) 1985-07-08
NO176795B (en) 1995-02-20
NL193832C (en) 2000-12-04
AT393124B (en) 1991-08-26
GB2152505B (en) 1987-07-29
NZ210678A (en) 1987-03-06
KR920001740B1 (en) 1992-02-24

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