KR840002348A - Element synthesis - Google Patents

Element synthesis Download PDF

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Publication number
KR840002348A
KR840002348A KR1019820005292A KR820005292A KR840002348A KR 840002348 A KR840002348 A KR 840002348A KR 1019820005292 A KR1019820005292 A KR 1019820005292A KR 820005292 A KR820005292 A KR 820005292A KR 840002348 A KR840002348 A KR 840002348A
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South Korea
Prior art keywords
ammonia
sample
carbon dioxide
urea
liquid
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KR1019820005292A
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Korean (ko)
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KR870001237B1 (en
Inventor
가쓰미 가게지까
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마쓰다 다까시
도오요 엔지니어링 가부시끼가이샤
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    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07CACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C273/00Preparation of urea or its derivatives, i.e. compounds containing any of the groups, the nitrogen atoms not being part of nitro or nitroso groups
    • C07C273/02Preparation 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
    • C07C273/04Preparation 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 from carbon dioxide and ammonia

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)

Abstract

내용 없음.No content.

Description

요소 합성법Element synthesis

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

제1도는 본 발명의 방법의 실시예 적합한 시스템의 일예를 나타낸 도면이고,1 shows an example of a suitable system of an embodiment of the method of the present invention,

제2도는 본 발명의 실시 태양을 설명하기 위한 도면이다.2 is a diagram for explaining an embodiment of the present invention.

Claims (6)

이산화탄소와 화학량론적으로 동일한 또는 과잉의 암모니아를 요소 합성 압력 및 요소 합성 온도로 요소 합성관 내에서 반응시켜서 미반응의 이산화탄소 및 암모니아를 함유하는 조요소 합성액을 수득한 다음 이조 요소액으로부터 미반응 이산화탄소와 암모니아를 분리시켜 조 요소 합성액을 요소 수용액으로 전환시킨 후, 흡수액을 사용하여 분리된 미반응 이산화탄소와 암모니아의 적어도 일부분을 흡수시키고 이어서 상기 흡수액을 요소 합성관에 재순환시키는 단계를 포함하는 순환식 요소 합성 법에 있어서, 상기 1단계에서 순환하는 류의 소량 부분을 샘플로서 주기적요로 회수하고; 상기 샘플중의 암모니아 함량과 암모늄 카바메이트 함량을 량적으로 분석하고; 상기 단계의 하나 이상의 조작 인자를 상기 암모니아와 암모륨 카바메이트 함량으로 측정한 값에 따라 조정하여 상기 단계의 조작을 원하는 상태로 유지시킴을 특징으로 하는 순환식요 소합성법.Reaction of ammonia with stoichiometrically identical or excess ammonia in the urea synthesis tube at urea synthesis pressure and urea synthesis temperature yields a crude urea solution containing unreacted carbon dioxide and ammonia and then unreacted carbon dioxide from the urea solution. And converting the crude urea synthesis solution into an aqueous urea solution by separating ammonia and chlorine, and then absorbing at least a portion of the separated unreacted carbon dioxide and ammonia using the absorbent liquid, and then recycling the absorbent liquid to the urea synthesis tube. A urea synthesis method, comprising: periodically recovering a small portion of a stream circulating in step 1 as a sample; Quantitatively analyzing the ammonia content and ammonium carbamate content in the sample; At least one operating factor of the step is adjusted according to the measured value of the ammonia and ammorium carbamate content to maintain the operation of the step in a desired state. 제1항에 있어서, 상기 샘플은 요소 합성관으로부터 회수한 조 요소액의 소량 부분이고, 상기 샘플을 정량 분석하여 상기 조 요소액 내에존재하는 암모니아 함량과 암모늄 카바메이트 함량을 결정하며, 상기관에 공급한 새로운 암모니아와 이산화탄소의 량을 수득한 상기 샘플 중의 암모니아와 암모늄 카바메이트의 함량에 근거로 하여 계산한 상기 관 중에 존재하는 총 이산화탄소에 대한 총 암모니아의 몰비에 따라 조절하여 상기 관중에 존재하는 총 이산화탄소에 대한 총 암모니아의 몰비를 예비 결정 범위로 유지시키는 상기 순환식 요소 합성법.The method of claim 1, wherein the sample is a small portion of the crude urea liquid recovered from the urea synthesis tube, and the sample is quantitatively analyzed to determine ammonia content and ammonium carbamate content present in the crude urea liquid. The amount of fresh ammonia and carbon dioxide supplied was adjusted according to the molar ratio of total ammonia to total carbon dioxide present in the tube calculated on the basis of the content of ammonia and ammonium carbamate in the sample to obtain the total amount of fresh ammonia and carbon dioxide. Wherein said cyclic urea synthesis method maintains the molar ratio of total ammonia to carbon dioxide in a preliminary range. 제1항에 있어서, 상기 조 요소 합성액으로부터 미반응 이산화탄소와 암모니아를 분리하는 단계를 상기 요소 합성액을 가열시켜 수행하는 상기 방법.The method according to claim 1, wherein the step of separating unreacted carbon dioxide and ammonia from the crude urea synthesis liquid is carried out by heating the urea synthesis liquid. 제1항에 있어서, 상기 조 와소 합성액으로부터 미반응이산화탄소와 암모니아를 분리하는 단계를 이산화탄소 또는 불활성가스로 상기 조 요소액을 1회 이상 스트립핑시켜 수행하는 상기 방법.The method according to claim 1, wherein the step of separating the unreacted carbon dioxide and ammonia from the crude Waso synthesis liquid is performed by stripping the crude urea solution one or more times with carbon dioxide or an inert gas. 제1항에 있어서, 상기 흡수액에 의해 흡수되지 않은 과잉의 암모니아를 회수하여 이들로부터 액체암모니아를 얻어 이 액체암모니아를 상기 요소 합성관에 재순환시키는 단계를 더 포함하는 상기 방법.The method according to claim 1, further comprising recovering excess ammonia not absorbed by the absorbent liquid to obtain liquid ammonia therefrom and recycling the liquid ammonia to the urea synthesis tube. 제2항에 있어서, 요소 합성관으로부터 회수한 상기조 요소 합성액은 고압 스트립핑 컬럼에 직접 제1라인을 통해이송하고, 상기 조요 소 합성액으로부터 미반응 이산화탄소와 암모니아의 분리 단계를 수행하고, 상기 조 요소 수용액의 샘플은 제1라인에 연결된 제2지선 라인을 통해 회수하고, 물을 사용하여 상기 샘플을 샘플 부피의 10 내지 100배 량요로 희석한 후, 상기 샘플을 완전히 혼합시키면서 0 내지 1kg/cm2게이지 압으로 한 다음 상기 샘플의 잔여분을 상기 반응 스팀에 재순환시키면서 상기 샘플 0.5 내지 50ml를 포함하는 소부분을 분석기에 의해 분석하며, 상기 분석기는 상기 샘플에 존재하는 암모니아와 상기 샘플에 존재하는 암모늄 카바메이트와 결합한 암모니아의 합인 비 R1을 결정하며, 상기 요소 합성관에 공급된 이산화탄소에 대한 암모니아비를 원하는 값 R1에 멀어진 상기 비 R1의 차이에 따라 변화시키는 단계를 포함하는 상기 방법.The crude urea synthesis liquid recovered from the urea synthesis tube is transferred directly to the high pressure stripping column through the first line, and the separation step of the unreacted carbon dioxide and ammonia is carried out from the crude synthesis liquid. A sample of the crude urea aqueous solution was collected through a second branch line connected to the first line, diluted with water to 10 to 100 times the volume of the sample using water, and then 0 to 1 kg with complete mixing of the sample. / cm 2 gauge pressure and then analyzed by the analyzer a small portion comprising 0.5-50 ml of the sample while recycling the remainder of the sample to the reaction steam, the analyzer being present in the sample with ammonia present in the sample ammonia and ammonium carbamate and determining a sum ratio R 1 of the ammonia combines, for the carbon dioxide fed to the urea synthesis tube The method comprises the step of changing the difference in the ratio R 1 father away the desired value R 1. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR8205292A 1981-11-25 1982-11-24 Synthesis process of urea KR870001237B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP187775/81 1981-11-25
JP56187775A JPS5890544A (en) 1981-11-25 1981-11-25 Urea synthesis

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KR840002348A true KR840002348A (en) 1984-06-25
KR870001237B1 KR870001237B1 (en) 1987-06-26

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JP (1) JPS5890544A (en)
KR (1) KR870001237B1 (en)
BR (1) BR8206811A (en)
DE (1) DE3243356A1 (en)
FR (1) FR2516918A1 (en)
GB (1) GB2110675B (en)
IN (1) IN159630B (en)
IT (1) IT1155070B (en)
NL (1) NL8204495A (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4928740B2 (en) * 2005-05-31 2012-05-09 東洋エンジニアリング株式会社 Urea synthesis method and apparatus
EA024558B1 (en) 2009-05-28 2016-09-30 Тойо Инджиниринг Корпорейшн Method for analyzing aqueous ammonium carbamate solution, and method for operating unreacted gas absorber

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* Cited by examiner, † Cited by third party
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US3758572A (en) * 1971-04-26 1973-09-11 Dow Chemical Co Process for recovering urea from pyrolysis systems

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Publication number Publication date
IN159630B (en) 1987-05-30
JPS5890544A (en) 1983-05-30
IT8224430A0 (en) 1982-11-24
IT1155070B (en) 1987-01-21
GB2110675A (en) 1983-06-22
NL8204495A (en) 1983-06-16
IT8224430A1 (en) 1984-05-24
KR870001237B1 (en) 1987-06-26
GB2110675B (en) 1985-07-24
DE3243356A1 (en) 1983-06-01
JPS6239152B2 (en) 1987-08-21
BR8206811A (en) 1983-10-04
FR2516918A1 (en) 1983-05-27

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