IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0983462
(1998-01-13)
|
우선권정보 |
SE-0003326 (1995-09-26) |
국제출원번호 |
PCT/SE96/00976
(1996-07-26)
|
§371/§102 date |
19980113
(19980113)
|
국제공개번호 |
WO-9706099
(1997-02-20)
|
발명자
/ 주소 |
- Langlet Abraham,SEX
- Ostmark Henric,SEX
- Wingborg Niklas,SEX
|
출원인 / 주소 |
- Forsvarets Forskningsanstalt, SEX
|
대리인 / 주소 |
Jacobson, Price, Holman & Stern, PLLC
|
인용정보 |
피인용 횟수 :
9 인용 특허 :
4 |
초록
▼
The invention relates to a method of preparing dinitramidic acid HN(NO.sub.2).sub.2 and salts thereof having the formula M.sup.+n (.sup.- N(NO.sub.2).sub.2).sub.n, wherein M is a metal cation or a nitrogen-containing cation and n=1-3. The dinitramide salt can be used as oxidiser in solid propellants
The invention relates to a method of preparing dinitramidic acid HN(NO.sub.2).sub.2 and salts thereof having the formula M.sup.+n (.sup.- N(NO.sub.2).sub.2).sub.n, wherein M is a metal cation or a nitrogen-containing cation and n=1-3. The dinitramide salt can be used as oxidiser in solid propellants. Dinitramidic acid is prepared by nitration of a compound selected from a group consisting of NH.sub.2 NO.sub.2, NH.sub.4 NH.sub.2 CO.sub.2 ; NH.sub.2 SO.sub.3 H, NH(SO.sub.3 H).sub.2, N(SO.sub.3 H).sub.3, and its salts with metal cations or organic cations, e.g. NH(SO.sub.3 NH.sub.4).sub.2, and other products formed when ammonia is reacted with sulphuric trioxide, with a common nitrating acid such as nitric acid/sulphuric acid or nitric acid/acetic anhydride. The invention also relates to a method of preparing dinitramide salt, comprising neutralisation of dinitramidic acid with a neutralising agent, e.g. ammonia, and recovery of the dinitramide salt from a mixture of salts formed in the neutralisation. An aqueous solution of the salt mixture is passed through a column containing an adsorbing agent which adsorbs the dinitramide salt and is selected from a class consisting of activated carbon, silica gel and zeolites. The dinitramide salt is eluted with an elution agent consisting of hot water and/or a polar organic solvent, e.g. acetone, acetonitrile, 2-propanol and other lower alcohols and mixtures thereof.
대표청구항
▼
[ What is claimed is:] [1.] A method of preparing dinitramide salt, comprisingproviding an initial compound selected from the group consisting of NH.sub.2 NO.sub.2, NH.sub.4 NH.sub.2 CO.sub.2, NH.sub.2 SO.sub.3 H, NH(SO.sub.3 H).sub.2, N(SO.sub.3 H).sub.3, reaction products of ammonia and sulphur tr
[ What is claimed is:] [1.] A method of preparing dinitramide salt, comprisingproviding an initial compound selected from the group consisting of NH.sub.2 NO.sub.2, NH.sub.4 NH.sub.2 CO.sub.2, NH.sub.2 SO.sub.3 H, NH(SO.sub.3 H).sub.2, N(SO.sub.3 H).sub.3, reaction products of ammonia and sulphur trioxide, and salts thereof with metal, ammonium and organic cations;reacting said initial compound with a nitrating acid mixture selected from the group consisting of nitric acid/sulphuric acid (HNO.sub.3 /H.sub.2 SO.sub.4), nitric acid/oleum (HNO.sub.3 /H.sub.2 SO.sub.4 /SO.sub.3), nitric acid/sulphur trioxide (NHO.sub.3 /SO.sub.3), nitric acid/perchloric acid (HNO.sub.3 /HClO.sub.4), nitric acid/phosphoric acid (HNO.sub.3 /H.sub.3 PO.sub.4), nitric acid/diphosphorous pentoxide (HNO.sub.3 /P.sub.2 O.sub.5), nitric acid/acetic acid, nitric acid/acetic anhydride, nitric acid/trifluoroacetic acid and nitric acid/trifluoroacetic anhydride, at a temperature of -25.degree. C. or below, to form dinitramidic acid in the reaction mixture; neutralizing said reaction mixture with a neutralizing agent to neutralize said dinitramidic acid and form the corresponding dinitramide salt and recovering said dinitramide salt. [14.] A method of preparing dinitramidic acid, comprisingproviding an initial compound selected from the group consisting of NH.sub.2 NO.sub.2, NH.sub.4 NH.sub.2 CO.sub.2, NH.sub.2 SO.sub.3 H, NH(SO.sub.3 H).sub.2, N(SO.sub.3 H).sub.3, reaction products of ammonia and sulphur trioxide, and salts thereof with metal, ammonium and organic cations;reacting said initial compound with a nitrating acid mixture selected from the group consisting of nitric acid/sulphuric acid (NHO.sub.3 /H.sub.2 SO.sub.4), nitric acid/oleum (HNO.sub.3 /H.sub.2 SO.sub.4 /SO.sub.3), nitric acid/sulphur trioxide (HNO.sub.3 /SO.sub.3), nitric acid/perchloric acid (HNO.sub.3 /HClO.sub.4), nitric acid/phosphoric acid (HNO.sub.3 /H.sub.3 PO.sub.4), nitric acid/diphosphorous pentoxide (HNO.sub.3 /P.sub.2 O.sub.5), nitric acid/acetic acid, nitric acid/acetic anhydride, nitric acid/trifluoroacetic acid and nitric acid/trifluoroacetic anhydride, at a temperature of -25.degree. C. or below, to form dinitramidic acid in the reaction mixture, anddiluting said reaction mixture with water after a predetermined time of reaction. The method as claimed in claim 14, wherein said dilution of the reaction mixture is initiated when the concentration of dinitramidic acid in the reaction mixture has reached an optimal level. The method as claimed in claim 14, further comprising measuring the concentration of dinitramidic acid in the reaction mixture during said reaction by UV spectroscopy. [17.] In a method of preparing dinitramide salt, wherein dinitramidic acid is neutralized with a neutralizing agent to form the corresponding dinitramide salt and said dinitramide salt is recovered from a mixture of salts formed in said neutralization, the improvement comprising contacting an aqueous solution of said mixture of salts with an adsorbing agent which adsorbs the dinitramide salt, said adsorbing agent being selected from the group consisting of activated carbon, silica gel and zeolites, and desorbing said dinitramide salt from said adsorbing agent with hot water and/or a polar organic solvent. The method as claimed in claim 17, further comprising arranging said adsorbing agent in a column, passing said aqueous solution of the salt mixture through said column, and eluting said dinitramide salt with an elution agent consisting of hot water and/or a polar organic solvent. The method as claimed in claim 18, wherein said dinitramide salt is eluted by gradient elution.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.