IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
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출원번호 |
US-0679839
(2012-11-16)
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등록번호 |
US-8592620
(2013-11-26)
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발명자
/ 주소 |
- Hassan, Abbas
- Bagherzadeh, Ebrahim
- Anthony, Rayford G.
- Borsinger, Gregory G.
- Hassan, Aziz
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출원인 / 주소 |
|
대리인 / 주소 |
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인용정보 |
피인용 횟수 :
0 인용 특허 :
42 |
초록
▼
A method for producing acetic anhydride that includes operating a high shear device at a shear rate of greater than about 20,000 s−1, wherein the high shear device is configured with a rotor and a stator; forming in the high shear device an emulsion having a liquid catalyst dispersed in an acetic ac
A method for producing acetic anhydride that includes operating a high shear device at a shear rate of greater than about 20,000 s−1, wherein the high shear device is configured with a rotor and a stator; forming in the high shear device an emulsion having a liquid catalyst dispersed in an acetic acid solution; introducing the emulsion into a reactor at conditions suitable for the production of ketene; and reacting at least some ketene with acetic acid to produce acetic anhydride.
대표청구항
▼
1. A method for producing acetic anhydride, comprising: operating a high shear device at a shear rate of greater than about 20,000 s−1, wherein the high shear device is configured with a rotor and a stator;forming in the high shear device an emulsion comprising a liquid catalyst dispersed in an acet
1. A method for producing acetic anhydride, comprising: operating a high shear device at a shear rate of greater than about 20,000 s−1, wherein the high shear device is configured with a rotor and a stator;forming in the high shear device an emulsion comprising a liquid catalyst dispersed in an acetic acid solution;introducing the emulsion into a reactor at conditions suitable for the production of ketene; andreacting at least some ketene with acetic acid to produce acetic anhydride. 2. The method of claim 1, wherein the high shear device has a nominal tip speed of at least about 23 m/s, and wherein the emulsion comprises liquid catalyst globules with an average globule diameter of less than about 5 μm. 3. The method of claim 1, further comprising: condensing acetic acid, water, and ammonia-neutralized catalyst in a chiller from which gases comprising ketene are removed; andintroducing the gases comprising ketene from the chiller into a second reactor wherein acetic anhydride is produced via contact of the ketene with acetic acid. 4. The method of claim 1, further comprising pressurizing the acetic acid solution to least about 203 kPa. 5. The method of claim 1, wherein the shear rate is less than about 100,000 s−1. 6. The method of claim 1, wherein the reactor is configured for the pyrolysis of acetic acid at a bulk reaction temperature of less than about 750° C. and a bulk reaction pressure of about ambient pressure. 7. The method of claim 1, further comprising cooling the emulsion before introducing it into the reactor. 8. The method of claim 1, further comprising recycling unreacted reactants through the high shear device. 9. The method of claim 1, wherein the liquid catalyst is immiscible in the acetic acid solution. 10. The method of claim 1, wherein the liquid catalyst comprises triethyl phosphate. 11. A method for forming acetic anhydride, comprising: operating a high shear device at a shear rate of greater than about 20,000 s−1, wherein the high shear device is configured with a rotor and a stator;processing a liquid catalyst and an acetic acid solution in the high shear device to form emulsion comprising liquid catalyst globules with an average globule diameter of less than about 5 μm;introducing the emulsion into a reactor at conditions suitable for the production of ketene; andreacting at least some ketene with the acetic acid solution to produce acetic anhydride. 12. The method of claim 11, wherein the high shear device has a nominal tip speed of at least about 23 m/s, and wherein the average globule diameter is less than about 1.5 μm. 13. The method of claim 11, further comprising: condensing acetic acid, water, and ammonia-neutralized catalyst to form ketene-comprising gases; andcontacting ketene-comprising with acetic acid to produce acetic anhydride. 14. The method of claim 11, further comprising pressurizing the acetic acid solution to least about 203 kPa, and wherein the shear rate is less than about 100,000 s−1. 15. The method of claim 11, wherein the reactor is configured for the pyrolysis of acetic acid at a bulk reaction temperature of less than about 750° C. and a bulk reaction pressure of about ambient pressure. 16. The method of claim 15, further comprising cooling the emulsion before introducing it into the reactor. 17. The method of claim 11, wherein the liquid catalyst comprises triethyl phosphate, and wherein the liquid catalyst is immiscible in the acetic acid solution. 18. A method for forming acetic anhydride, comprising: using a high shear device configured with a rotor and a stator;processing a liquid catalyst and an acetic acid solution in the high shear device to form an emulsion;introducing the emulsion into a reactor at suitable conditions to produce ketene by thermal decomposition of at least some of the acetic acid solution in the emulsion; andreacting the ketene to produce acetic anhydride. 19. The method of claim 18, wherein the reactor is configured for pyrolysis of acetic acid at a bulk reaction temperature of less than about 750° C., and wherein the emulsion comprises liquid catalyst globules with an average globule diameter of less than about 5 μm.
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