Integrated process for acetic acid and methanol
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
C07C-051/10
C07C-051/12
C07C-053/08
C07C-053/00
출원번호
US-0596955
(2004-01-22)
등록번호
US-7470811
(2008-12-30)
국제출원번호
PCT/CY04/000002
(2004-01-22)
§371/§102 date
20070523
(20070523)
국제공개번호
WO05/070855
(2005-08-04)
발명자
/ 주소
Thiebaut,Daniel Marcel
출원인 / 주소
Acetex (Cyprus) Limited
대리인 / 주소
Lundeen,Daniel N.
인용정보
피인용 횟수 :
31인용 특허 :
3
초록▼
An integrated process for making methanol, acetic acid, and a product from an associated process is disclosed. Syngas (120) is produced by combined steam reforming (109) and autothermal reforming (118) of natural gas (102) where a portion (112) of the natural gas bypasses the steam reformer (109) an
An integrated process for making methanol, acetic acid, and a product from an associated process is disclosed. Syngas (120) is produced by combined steam reforming (109) and autothermal reforming (118) of natural gas (102) where a portion (112) of the natural gas bypasses the steam reformer (109) and is blended with the steam reformer effluent for supply to the autothermal reformer (ATR) (118) with CO2 recycle (110). A portion of the syngas is fed to CO2 removal (122) to obtain the recycle CO2 and cold box (130) to obtain a hydrogen stream (131) and a CO stream (135). The remaining syngas, hydrogen stream (131) and CO2 from an associated process are fed to methanol synthesis (140), which produces methanol and a purge stream (124) supplied to the CO2 removal unit. The methanol is supplied to an acetic acid unit (13)6 with the CO (135) to make acetic acid, which in turn is supplied to a VAM synthesis unit (148). Oxygen for both the ATR and VAM synthesis can be supplied by a common air separation unit (116), and utilities such as steam generation can further integrate the process.
대표청구항▼
The invention claimed is: 1. A method for manufacturing methanol and acetic acid, characterized by the integrated steps of: separating a hydrocarbon source into first and second hydrocarbon streams; steam reforming the first hydrocarbon stream with steam to produce a reformed stream; autothermal re
The invention claimed is: 1. A method for manufacturing methanol and acetic acid, characterized by the integrated steps of: separating a hydrocarbon source into first and second hydrocarbon streams; steam reforming the first hydrocarbon stream with steam to produce a reformed stream; autothermal reforming of a mixture of the reformed stream and the second hydrocarbon stream with oxygen and carbon dioxide to produce a syngas stream; separating a minor portion of the syngas stream into a carbon dioxide-rich stream, a hydrogen-rich stream, and a carbon monoxide-rich stream; recycling the carbon dioxide-rich stream to the autothermal reforming; compressing a remaining portion of the syngas stream, at least a portion of the hydrogen-rich stream to supply a makeup stream to a methanol synthesis loop to obtain a methanol product; and synthesizing acetic acid from at least a portion of the methanol product and the carbon monoxide-rich stream. 2. The method of claim 1, wherein the makeup stream has a stoichiometric number (SN) between 2.0 and 2.1, wherein the SN is calculated from component concentrations as [(H2-CO2)/(CO+CO2)]. 3. The method of any one of the preceding claims, further comprising supplying a purge gas stream from the methanol synthesis loop to the step of separating the minor portion of the syngas stream into a carbon dioxide-rich stream, a hydrogen-rich stream, and a carbon monoxide-rich stream. 4. The method of claims 1, wherein the autothermal reformer is a single train autothermal reformer. 5. The method of claims 1, wherein the step of separating the minor portion of the syngas stream into a carbon dioxide-rich stream, a hydrogen-rich stream, and a carbon monoxide-rich stream, includes supplying the minor portion of the syngas to a methane wash cold box unit. 6. The method of claim 5, wherein a flash gas from the step of separating the minor portion of the syngas stream into a carbon dioxide-rich stream, a hydrogen-rich stream, and a carbon monoxide-rich stream, is recycled to the methanol synthesis loop. 7. The method of any one of claims 5 or 6, wherein a tail gas stream from the cold box is recycled as feed gas. 8. The method of claim 1, wherein carbon dioxide emissions are less than 10% of the total carbon input. 9. The method of claim 1, wherein carbon dioxide emissions are less than 5 percent of the total carbon input. 10. The method of claim 1, wherein a first portion of the hydrogen-rich stream from the separation step is recycled to the methanol synthesis loop and a second portion is sent as feed to an associated process. 11. The method of claim 1, further comprising supplying a carbon dioxide stream from an associated process to supply the makeup stream. 12. The method of any one of claims 10 or 11, wherein the associated process uses the acetic acid as a reactant, uses the methanol product as a reactant, shares oxygen from a common air separation unit, shares common utilities, or a combination thereof. 13. The method of claim 12, further comprising: providing at least a portion of the acetic acid produced to a vinyl acetate monomer synthesis loop in the associated process; combining the portion of the acetic acid with an ethylene source and oxygen to produce vinyl acetate monomer. 14. The method of claim 13, wherein a single air separation unit supplies oxygen to the associated process and the autothermal reformer. 15. The method of claim 1, wherein at least 10% of the syngas stream is directed to the step of separating the minor portion of the syngas stream into a carbon dioxide-rich stream, a hydrogen-rich stream, and a carbon monoxide-rich stream. 16. The method of claim 1, wherein the methanol produced is between 1,000 and 30,000 tons/day. 17. The method of claim 1, wherein the acetic acid produced is between 500 and 6,000 metric tons/day. 18. The method of claim 1, further comprising importing a CO2-rich stream to the methanol synthesis loop. 19. The method of claim 13, further comprising importing a CO2-rich stream from the vinyl acetate monomer synthesis loop to the methanol synthesis loop. 20. The method of claim 18, wherein the hydrocarbon source comprises natural gas and a ratio of the imported CO2 stream to the hydrocarbon source is at least 0.05 kg CO2 per Nm3 natural gas. 21. The method of claim 20, wherein the ratio of the imported CO2 stream to the natural gas is at least 0.2 kg CO2 per Nm3 natural gas. 22. The method of claim 19, wherein the ratio of the imported CO2 to the natural gas is at least 0.23 kg CO2 per Nm3 natural gas. 23. The method of any claim 1, comprising: diverting between 35 and 65% of the feed gas stream to the first stream; and diverting between 35 and 65% of the feed gas stream to the second stream. 24. The method of any claim 1, comprising: diverting 45 to 55% of the feed gas stream to the first stream; and diverting 45 to 55% of the feed gas stream to the second stream. 25. The method of claim 1 wherein the step of separating the minor portion of the syngas stream into a carbon dioxide-rich stream, a hydrogen-rich stream, and a carbon monoxide-rich stream, produces a tail gas stream enriched in inerts.
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