GB455865A - Improvements in and apparatus for the separation of carbon dioxide and/or hydrogen sulphide from ammonia - Google Patents

Improvements in and apparatus for the separation of carbon dioxide and/or hydrogen sulphide from ammonia

Info

Publication number
GB455865A
GB455865A GB13002/35A GB1300235A GB455865A GB 455865 A GB455865 A GB 455865A GB 13002/35 A GB13002/35 A GB 13002/35A GB 1300235 A GB1300235 A GB 1300235A GB 455865 A GB455865 A GB 455865A
Authority
GB
United Kingdom
Prior art keywords
amine
ammonia
carbon dioxide
temperature
urea
Prior art date
Legal status (The legal status 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 status listed.)
Expired
Application number
GB13002/35A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
IG Farbenindustrie AG
Original Assignee
IG Farbenindustrie AG
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 IG Farbenindustrie AG filed Critical IG Farbenindustrie AG
Priority to GB13002/35A priority Critical patent/GB455865A/en
Publication of GB455865A publication Critical patent/GB455865A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
    • C01C1/00—Ammonia; Compounds thereof
    • C01C1/02—Preparation, purification or separation of ammonia
    • C01C1/12—Separation of ammonia from gases and vapours
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B32/00—Carbon; Compounds thereof
    • C01B32/50—Carbon dioxide
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/10—Process efficiency

Abstract

Carbon dioxide is removed from ammonia by washing a gas consisting of or containing the said constituents, e.g. unconverted material from the conversion of ammonium carbamate into urea, with an aliphatic amine which is substituted on the nitrogen atom by one, but only one, hydroxyalkyl group or with a solution of such an amine, at a temperature which is so high that no substantial amount of ammonia is absorbed but which is below the temperature at which the weak gaseous acid is split off from its salt with the amine, the said temperature being at least 70 DEG C. Preferably, temperatures above 95 DEG C., say 100--125 DEG C., are employed. Suitable amines include monobutanol amine, monohydroxyethylethylene diamine, monopropanol amine and monoethanol amine. The weak gaseous acid may be recovered by heating the resulting solution to higher temperatures. In working up the unconverted ammonium carbamate left in the preparation of urea therefrom under pressure, the unconverted mixture of ammonia and carbon dioxide is separated by the present process, the constituents being compressed again separately from each other in unheated compressors for return to the plant for the preparation of urea.ALSO:Weak gaseous acids, such as carbon dioxide or hydrogen sulphide, are removed from ammonia by washing a gas consisting of or containing the said constituents with an aliphatic amine which is substituted on the nitrogen atom by one but only one hydroxyalkyl group or with a solution of such an amine, at a temperature which is so high that no substantial amount of ammonia is absorbed but which is below the temperature at which the weak gaseous acid is split off from its salt with the amine, the said temperature being at least 70 DEG C. Preferably temperatures above 95 DEG C., say 100--125 DEG C., are employed. Suitable amines include monobutanol amine, monohydroxyethylethylene diamine, monopropanol amine and monoethanol amine. If the gas mixture contains water vapour, this will be removed in the washing step. The process may be conducted at atmospheric or elevated pressure. The weak gaseous acid may be recovered by heating the resulting solution to higher temperatures. The weak gaseous acid thus recovered contains a little ammonia which may be removed therefrom in known manner by washing. The process may be used for working up the unconverted ammonium carbamate left in the preparation of urea therefrom under pressure, the unconverted mixture of ammonia and carbon dioxide being separated by the present process and compressed again separately from each other in unheated compressors for return to the plant for the preparation of urea. The process may also be used to separate the gases obtained by heating gas liquor. If the process for the separation of ammonia and carbon dioxide is conducted under pressure with the employment of monopropanol amine, the ammonia which escapes is free from carbon dioxide; by releasing the pressure while maintaining the temperature further ammonia containing some carbon dioxide is obtained, while the carbon dioxide may be recovered by raising the temperature at atmospheric pressure.
GB13002/35A 1935-05-01 1935-05-01 Improvements in and apparatus for the separation of carbon dioxide and/or hydrogen sulphide from ammonia Expired GB455865A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB13002/35A GB455865A (en) 1935-05-01 1935-05-01 Improvements in and apparatus for the separation of carbon dioxide and/or hydrogen sulphide from ammonia

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB13002/35A GB455865A (en) 1935-05-01 1935-05-01 Improvements in and apparatus for the separation of carbon dioxide and/or hydrogen sulphide from ammonia

Publications (1)

Publication Number Publication Date
GB455865A true GB455865A (en) 1936-10-29

Family

ID=10015029

Family Applications (1)

Application Number Title Priority Date Filing Date
GB13002/35A Expired GB455865A (en) 1935-05-01 1935-05-01 Improvements in and apparatus for the separation of carbon dioxide and/or hydrogen sulphide from ammonia

Country Status (1)

Country Link
GB (1) GB455865A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2950173A (en) * 1956-10-31 1960-08-23 Montedison Spa Process for separating carbon dioxide from ammonia in the production of melamine from urea
DE1282623B (en) * 1961-05-12 1968-11-14 Allied Chem Process for the separation of ammonia from a gaseous mixture of ammonia and carbonic acid
DE1282624B (en) * 1961-05-12 1968-11-14 Allied Chem Process for the production of ammonia from a gaseous mixture of ammonia and carbon dioxide

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2950173A (en) * 1956-10-31 1960-08-23 Montedison Spa Process for separating carbon dioxide from ammonia in the production of melamine from urea
DE1282623B (en) * 1961-05-12 1968-11-14 Allied Chem Process for the separation of ammonia from a gaseous mixture of ammonia and carbonic acid
DE1282624B (en) * 1961-05-12 1968-11-14 Allied Chem Process for the production of ammonia from a gaseous mixture of ammonia and carbon dioxide

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