IPC분류정보
| 국가/구분 |
United States(US) Patent
등록
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| 국제특허분류(IPC7판) |
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| 출원번호 |
US-0191745
(2008-08-14)
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| 등록번호 |
US-8530716
(2013-09-10)
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발명자
/ 주소 |
- Wilsak, Richard A.
- Roberts, Scott A.
- Janulis, Rose M.
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| 출원인 / 주소 |
- BP Corporation North America Inc.
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| 대리인 / 주소 |
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| 인용정보 |
피인용 횟수 :
0 인용 특허 :
60 |
초록
▼
Processes for separating a solid from a solids-liquids slurry under conditions that prevent ingress of molecular oxygen are advantageous where the presence of molecular oxygen would otherwise reduce efficiencies, contribute to limited product yields, and potentially compromise safe operation of the
Processes for separating a solid from a solids-liquids slurry under conditions that prevent ingress of molecular oxygen are advantageous where the presence of molecular oxygen would otherwise reduce efficiencies, contribute to limited product yields, and potentially compromise safe operation of the process or downstream unit operations. Among the various embodiments disclosed herein, is a process utilizing filter columns as solid-liquid separators in combination with crystallization and reslurry unit operations to recover a product component from an initial feed mixture of miscible components. Embodiments of the disclosed processes may include the separation and purification of a product component using a crystallizer in series with a filter column followed by a chemical reactor, using a reslurry drum in series with a filter column, and using a combination of crystallizers and/or reslurry drums in series with at least one filter column. The use of filter columns in such processes is particularly attractive because these columns, when operated under the conditions disclosed herein, limit the undesirable ingress of molecular oxygen into the various process streams, and further improve process efficiencies related to both product component recovery and operating costs.
대표청구항
▼
1. A process for crystallizing a product, the process comprising: (a) crystallizing a liquid feed stream, the feed stream comprising a liquid secondary component and a liquid product component having a melting point higher than that of the liquid secondary component, in a crystallizer operating at a
1. A process for crystallizing a product, the process comprising: (a) crystallizing a liquid feed stream, the feed stream comprising a liquid secondary component and a liquid product component having a melting point higher than that of the liquid secondary component, in a crystallizer operating at a temperature sufficient to crystallize at least a portion of the liquid product component to form a slurry effluent comprising product component crystals and the liquid secondary component;(b) at least partially separating the product component crystals and the liquid secondary component of the slurry effluent in a filter column to form (i) a filtrate comprising the liquid secondary component and(ii) a filter cake comprising the product component crystals;(c) converting at least a portion of the liquid secondary component of the filtrate to the liquid product component in a chemical reactor; and(d) performing at least one reslurrying process stage in series following the separation of (b), each of the least one reslurrying process stages comprising: (i) combining in a reslurry drum the product components crystals and an additional reslurry diluent comprising the liquid product component and the liquid secondary component; and,(ii) equilibrating the product component crystals with the liquid product and liquid secondary components in the reslurry drum for a time sufficient to form a reslurry effluent comprising the product component crystals and the liquid secondary component;(iii) at least partially separating the product component crystals and the liquid secondary component in a separation unit to form (A) a filtrate comprising the liquid secondary component; and(B) a filter cake comprising the product component crystals;wherein the separation unit in at least one of the least one reslurrying process stage comprises a filter column; and the separation unit in the last stage of the at least one reslurrying process stage is not a filter column. 2. The process of claim 1, wherein the filter cake comprises about 50 wt. % to about 99 wt. % product component crystals, based on the total weight of the filter cake. 3. The process of claim 1, wherein the liquid product component is para-xylene, and the liquid secondary component is selected from the group consisting of ortho-xylene, meta-xylene, ethylbenzene, and combinations thereof. 4. The process of claim 3, wherein the liquid feed stream comprises about 10 wt % to about 30 wt. % liquid product component, based on the total weight of the liquid feed stream. 5. The process of claim 3, wherein the chemical reactor comprises an isomerization reactor for converting at least one of orthoxylene, metaxylene, and ethylbenzene to paraxylene. 6. The process of claim 1, wherein: step (a) further comprises combining with the liquid feed stream a recycle stream comprising the liquid product component and the liquid secondary component, and the liquid feed stream has a weight concentration of the liquid product component less than that of the recycle stream. 7. The process of claim 1, wherein the filter cake has a product component weight concentration greater than that of the filtrate. 8. The method of claim 1, wherein the separation unit in the last stage of the at least one reslurrying process stage comprises a wash column. 9. The process of claim 8, wherein the liquid product component is paraxylene, and the liquid secondary component is selected from the group consisting of orthoxylene, metaxylene, ethylbenzene, and combinations thereof. 10. The process of claim 9, wherein the chemical reactor comprises an isomerization reactor for converting at least one of orthoxylene, metaxylene, and ethylbenzene to paraxylene. 11. A process for crystallizing a product, the process comprising: (a) crystallizing a liquid feed stream, the feed stream comprising a liquid secondary component and a liquid product component having a melting point higher than that of the liquid secondary component, in a crystallizer operating at a temperature sufficient to crystallize at least a portion of the liquid product component to form a slurry effluent comprising product component crystals and the liquid secondary component;(b) at least partially separating the product component crystals and the liquid secondary component of the slurry effluent in a filter column to form (i) a filtrate comprising the liquid secondary component and(ii) a filter cake comprising the product component crystals;(c) converting at least a portion of the liquid secondary component of the filtrate to the liquid product component in a chemical reaction; andat least one additional crystallization stage in series, wherein each at least one additional crystallization stage process comprises:(i) crystallizing a liquid feed stream, the feed stream comprising the liquid secondary component and the liquid product component,(ii) at least partially separating the product component crystals and the liquid secondary component of the slurry effluent in a separation unit (A) a filtrate comprising the liquid product component and the liquid secondary component and(B) an enriched product stream comprising the product component crystals; andwherein the separation unit in at least one of the least one additional crystallization stage comprises a filter column, and the last one of the least one additional crystallization stage is not a filter column. 12. The method of claim 11, wherein the separation unit in the last one of the least one additional crystallization stage comprises a wash column. 13. The process of claim 12, wherein the liquid product component is paraxylene, and the liquid secondary component is selected from the group consisting of orthoxylene, metaxylene, ethylbenzene, and combinations thereof. 14. The process of claim 13, wherein the chemical reactor comprises an isomerization reactor for converting at least one of orthoxylene, metaxylene, and ethylbenzene to paraxylene.
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