IPC분류정보
국가/구분 |
United States(US) Patent
공개
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0473203
(2003-09-29)
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공개번호 |
US-0094478
(2004-05-20)
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우선권정보 |
DE-10128249.4 (2001-06-11) |
국제출원번호 |
PCT/EP02/06336
(2002-06-10)
|
발명자
/ 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
0 인용 특허 :
0 |
초록
▼
A method of at least partly removing formic acid from an aqueous solution comprising formic acid, cyclohexanone and cyclohexanol comprises decomposing the formic acid over a basic metal oxide of metals of groups 2, 4, 5, 12 and/or 14 or over a noble metal of groups 8-11 on an oxidic support as decom
A method of at least partly removing formic acid from an aqueous solution comprising formic acid, cyclohexanone and cyclohexanol comprises decomposing the formic acid over a basic metal oxide of metals of groups 2, 4, 5, 12 and/or 14 or over a noble metal of groups 8-11 on an oxidic support as decomposition catalyst. The method is preferably used for the further processing of reaction products from the oxidation of cyclohexane in a process which comprises the following steps: (i) extraction of the product gas mixture obtained in the oxidation of cyclohexane using an aqueous scrubbing liquid to give an aqueous solution comprising carboxylic acids (ii) separation of the aqueous solution comprising carboxylic acids obtained in step (i) into an aqueous solution comprising formic acid, cyclohexanone and cyclohexanol together with further minor organic components and a carboxylic acid mixture by distillation, with the carboxylic acid mixture being able to be processed further in a customary manner to give 1,6-hexanediol, (iii) at least a partial removal of the formic acid from the aqueous solution comprising formic acid, cyclohexanone and cyclohexanol obtained in step (ii) by decomposition of the formic acid over a basic metal oxide of metals of groups 2, 4, 5, 12 and/or 14 or over a noble metal of groups 8-11 on an oxidic or nonoxidic support as decomposition catalyst, (iv) further processing of the aqueous solution comprising cyclohexanone and cyclohexanol obtained in step (iii) to give epsilon-caprolactam, or use of the aqueous solution comprising cyclohexanone and cyclohexanol obtained in step (iii) as scrubbing liquid in step (i).
대표청구항
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1. A method of at least partly removing formic acid from an aqueous solution comprising formic acid, cyclohexanone and cyclohexanol, which comprises decomposing the formic acid over a basic metal oxide of metals of groups 2, 4, 5, 12 and/or 14 or over a noble metal of groups 8-11 on an oxidic suppor
1. A method of at least partly removing formic acid from an aqueous solution comprising formic acid, cyclohexanone and cyclohexanol, which comprises decomposing the formic acid over a basic metal oxide of metals of groups 2, 4, 5, 12 and/or 14 or over a noble metal of groups 8-11 on an oxidic support as decomposition catalyst. 2. A method as claimed in claim 1, wherein the decomposition catalyst comprises zinc oxide and/or calcium oxide. 3. A method as claimed in claim 1 or2, wherein the decomposition is carried out at from 100 to 400° C. 4. A method as claimed in any of claims 1 to 3, wherein the decomposition is carried out continuously over a fixed-bed or suspended decomposition catalyst. 5. A method as claimed in any of claims 1 to 4, wherein the aqueous solution comprising formic acid, cyclohexanone and cyclohexanol is obtained by extraction of the product gas mixture obtained in the oxidation of cyclohexane by means of oxygen or an oxygen-containing gas using an aqueous scrubbing liquid and distillation of the aqueous carboxylic acid solution obtained in this way. 6. A method as claimed in any of claims 1 to 5, wherein formic acid is removed from an aqueous solution comprising(a) from 3 to 6% by weight of formic acid, (b) from 0.1 to 2% by weight of cyclohexanol, (c) from 0.1 to 2% by weight of cyclohexanone, (d) from 92 to 96.8% by weight of water. 7. A process for the further processing of reaction products of the oxidation of cyclohexane, which comprises the steps(i) extraction of the product gas mixture obtained in the oxidation of cyclohexane using an aqueous scrubbing liquid to give an aqueous solution comprising carboxylic acids, (ii) separation of the aqueous solution comprising carboxylic acids obtained in step (i) into an aqueous solution comprising formic acid, cyclohexanone and cyclohexanol together with further minor organic components and a carboxylic acid mixture by distillation, with the carboxylic acid mixture being able to be processed further in a customary manner to give 1,6-hexanediol, (iii) at least a partial removal of the formic acid from the aqueous solution comprising formic acid, cyclohexanone and cyclohexanol obtained in step (ii) by decomposition of the formic acid over a basic metal oxide of metals of groups 2, 4, 5, 12 and/or 14 or over a noble metal of groups 8-11 on an oxidic or nonoxidic support as decomposition catalyst, (iv) further processing of the aqueous solution comprising cyclohexanone and cyclohexanol obtained in step (iii) to give epsilon-caprolactam, or use of the aqueous solution comprising cyclohexanone and cyclohexanol obtained in step (iii) as scrubbing liquid in step (i).
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