JP4976383B2 - 酢酸の製造方法 - Google Patents
酢酸の製造方法 Download PDFInfo
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- JP4976383B2 JP4976383B2 JP2008508883A JP2008508883A JP4976383B2 JP 4976383 B2 JP4976383 B2 JP 4976383B2 JP 2008508883 A JP2008508883 A JP 2008508883A JP 2008508883 A JP2008508883 A JP 2008508883A JP 4976383 B2 JP4976383 B2 JP 4976383B2
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- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 title claims description 297
- 238000004519 manufacturing process Methods 0.000 title description 13
- IKHGUXGNUITLKF-UHFFFAOYSA-N Acetaldehyde Chemical compound CC=O IKHGUXGNUITLKF-UHFFFAOYSA-N 0.000 claims description 100
- 238000000034 method Methods 0.000 claims description 94
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 87
- XBDQKXXYIPTUBI-UHFFFAOYSA-M Propionate Chemical compound CCC([O-])=O XBDQKXXYIPTUBI-UHFFFAOYSA-M 0.000 claims description 66
- KXKVLQRXCPHEJC-UHFFFAOYSA-N acetic acid trimethyl ester Natural products COC(C)=O KXKVLQRXCPHEJC-UHFFFAOYSA-N 0.000 claims description 66
- 239000007791 liquid phase Substances 0.000 claims description 63
- 238000005810 carbonylation reaction Methods 0.000 claims description 58
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 58
- 238000009835 boiling Methods 0.000 claims description 57
- 230000006315 carbonylation Effects 0.000 claims description 55
- 238000004821 distillation Methods 0.000 claims description 52
- 230000008569 process Effects 0.000 claims description 49
- INQOMBQAUSQDDS-UHFFFAOYSA-N iodomethane Chemical compound IC INQOMBQAUSQDDS-UHFFFAOYSA-N 0.000 claims description 47
- 239000012071 phase Substances 0.000 claims description 41
- 239000012808 vapor phase Substances 0.000 claims description 40
- 239000003054 catalyst Substances 0.000 claims description 39
- 239000000047 product Substances 0.000 claims description 38
- 238000006243 chemical reaction Methods 0.000 claims description 23
- 150000001875 compounds Chemical class 0.000 claims description 20
- IKHGUXGNUITLKF-XPULMUKRSA-N acetaldehyde Chemical compound [14CH]([14CH3])=O IKHGUXGNUITLKF-XPULMUKRSA-N 0.000 claims description 16
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 claims description 12
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 12
- LCGLNKUTAGEVQW-UHFFFAOYSA-N Dimethyl ether Chemical compound COC LCGLNKUTAGEVQW-UHFFFAOYSA-N 0.000 claims description 10
- ZTQSAGDEMFDKMZ-UHFFFAOYSA-N Butyraldehyde Chemical compound CCCC=O ZTQSAGDEMFDKMZ-UHFFFAOYSA-N 0.000 claims description 8
- 239000000376 reactant Substances 0.000 claims description 7
- 238000005882 aldol condensation reaction Methods 0.000 claims description 5
- 239000007859 condensation product Substances 0.000 claims description 5
- IQGZCSXWIRBTRW-ZZXKWVIFSA-N (2E)-2-ethyl-2-butenal Chemical compound CC\C(=C/C)C=O IQGZCSXWIRBTRW-ZZXKWVIFSA-N 0.000 claims description 4
- UNNGUFMVYQJGTD-UHFFFAOYSA-N 2-Ethylbutanal Chemical compound CCC(CC)C=O UNNGUFMVYQJGTD-UHFFFAOYSA-N 0.000 claims description 4
- MLUCVPSAIODCQM-NSCUHMNNSA-N crotonaldehyde Chemical compound C\C=C\C=O MLUCVPSAIODCQM-NSCUHMNNSA-N 0.000 claims description 4
- MLUCVPSAIODCQM-UHFFFAOYSA-N crotonaldehyde Natural products CC=CC=O MLUCVPSAIODCQM-UHFFFAOYSA-N 0.000 claims description 4
- HGBOYTHUEUWSSQ-UHFFFAOYSA-N valeric aldehyde Natural products CCCCC=O HGBOYTHUEUWSSQ-UHFFFAOYSA-N 0.000 claims description 4
- 125000000218 acetic acid group Chemical group C(C)(=O)* 0.000 claims 3
- LBSANEJBGMCTBH-UHFFFAOYSA-N manganate Chemical compound [O-][Mn]([O-])(=O)=O LBSANEJBGMCTBH-UHFFFAOYSA-N 0.000 claims 3
- 230000001186 cumulative effect Effects 0.000 claims 1
- 238000000605 extraction Methods 0.000 description 26
- 239000012535 impurity Substances 0.000 description 24
- 229910052703 rhodium Inorganic materials 0.000 description 18
- 239000010948 rhodium Substances 0.000 description 18
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 description 18
- 239000012429 reaction media Substances 0.000 description 16
- -1 methyl halide Chemical class 0.000 description 15
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 12
- 229910002091 carbon monoxide Inorganic materials 0.000 description 12
- 238000000926 separation method Methods 0.000 description 12
- 125000002915 carbonyl group Chemical group [*:2]C([*:1])=O 0.000 description 11
- XMBWDFGMSWQBCA-UHFFFAOYSA-M iodide Chemical class [I-] XMBWDFGMSWQBCA-UHFFFAOYSA-M 0.000 description 11
- 239000007788 liquid Substances 0.000 description 11
- XMBWDFGMSWQBCA-UHFFFAOYSA-N hydrogen iodide Chemical compound I XMBWDFGMSWQBCA-UHFFFAOYSA-N 0.000 description 9
- 239000000243 solution Substances 0.000 description 9
- 239000007789 gas Substances 0.000 description 8
- 229910052736 halogen Inorganic materials 0.000 description 8
- 150000002367 halogens Chemical class 0.000 description 8
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 7
- HSZCZNFXUDYRKD-UHFFFAOYSA-M lithium iodide Chemical compound [Li+].[I-] HSZCZNFXUDYRKD-UHFFFAOYSA-M 0.000 description 7
- 229910052751 metal Inorganic materials 0.000 description 7
- 239000002184 metal Substances 0.000 description 7
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 6
- 230000008901 benefit Effects 0.000 description 6
- XBDQKXXYIPTUBI-UHFFFAOYSA-N dimethylselenoniopropionate Natural products CCC(O)=O XBDQKXXYIPTUBI-UHFFFAOYSA-N 0.000 description 6
- 150000004694 iodide salts Chemical class 0.000 description 6
- 238000010992 reflux Methods 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 5
- 238000007796 conventional method Methods 0.000 description 5
- 229940006461 iodide ion Drugs 0.000 description 5
- 229920000642 polymer Polymers 0.000 description 5
- 238000000746 purification Methods 0.000 description 5
- 150000001299 aldehydes Chemical class 0.000 description 4
- 239000006227 byproduct Substances 0.000 description 4
- 150000001728 carbonyl compounds Chemical class 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 239000002243 precursor Substances 0.000 description 4
- 239000002904 solvent Substances 0.000 description 4
- 125000000217 alkyl group Chemical group 0.000 description 3
- 239000001569 carbon dioxide Substances 0.000 description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 description 3
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 3
- 239000007795 chemical reaction product Substances 0.000 description 3
- 150000002148 esters Chemical class 0.000 description 3
- 239000012467 final product Substances 0.000 description 3
- 150000004820 halides Chemical class 0.000 description 3
- 150000002431 hydrogen Chemical class 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- 229910000043 hydrogen iodide Inorganic materials 0.000 description 3
- 150000002923 oximes Chemical class 0.000 description 3
- 235000019260 propionic acid Nutrition 0.000 description 3
- IUVKMZGDUIUOCP-BTNSXGMBSA-N quinbolone Chemical compound O([C@H]1CC[C@H]2[C@H]3[C@@H]([C@]4(C=CC(=O)C=C4CC3)C)CC[C@@]21C)C1=CCCC1 IUVKMZGDUIUOCP-BTNSXGMBSA-N 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- AVXURJPOCDRRFD-UHFFFAOYSA-N Hydroxylamine Chemical compound ON AVXURJPOCDRRFD-UHFFFAOYSA-N 0.000 description 2
- XYFCBTPGUUZFHI-UHFFFAOYSA-N Phosphine Chemical group P XYFCBTPGUUZFHI-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 150000001350 alkyl halides Chemical class 0.000 description 2
- 150000001351 alkyl iodides Chemical class 0.000 description 2
- 150000001412 amines Chemical class 0.000 description 2
- 238000013459 approach Methods 0.000 description 2
- 150000001735 carboxylic acids Chemical class 0.000 description 2
- 150000001768 cations Chemical class 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000284 extract Substances 0.000 description 2
- 239000003446 ligand Substances 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- TZIHFWKZFHZASV-UHFFFAOYSA-N methyl formate Chemical compound COC=O TZIHFWKZFHZASV-UHFFFAOYSA-N 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000005191 phase separation Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 230000000717 retained effect Effects 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 238000003809 water extraction Methods 0.000 description 2
- ANOOTOPTCJRUPK-UHFFFAOYSA-N 1-iodohexane Chemical compound CCCCCCI ANOOTOPTCJRUPK-UHFFFAOYSA-N 0.000 description 1
- BLXSFCHWMBESKV-UHFFFAOYSA-N 1-iodopentane Chemical compound CCCCCI BLXSFCHWMBESKV-UHFFFAOYSA-N 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 1
- 150000001242 acetic acid derivatives Chemical class 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- 229910001516 alkali metal iodide Inorganic materials 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005587 bubbling Effects 0.000 description 1
- KMGBZBJJOKUPIA-UHFFFAOYSA-N butyl iodide Chemical compound CCCCI KMGBZBJJOKUPIA-UHFFFAOYSA-N 0.000 description 1
- 150000001721 carbon Chemical group 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 150000001767 cationic compounds Chemical class 0.000 description 1
- 150000001805 chlorine compounds Chemical class 0.000 description 1
- 238000006482 condensation reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 150000002366 halogen compounds Chemical class 0.000 description 1
- 150000004679 hydroxides Chemical class 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 229910001411 inorganic cation Inorganic materials 0.000 description 1
- HVTICUPFWKNHNG-UHFFFAOYSA-N iodoethane Chemical compound CCI HVTICUPFWKNHNG-UHFFFAOYSA-N 0.000 description 1
- 150000002576 ketones Chemical group 0.000 description 1
- 239000012263 liquid product Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910001511 metal iodide Inorganic materials 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- PVWOIHVRPOBWPI-UHFFFAOYSA-N n-propyl iodide Chemical compound CCCI PVWOIHVRPOBWPI-UHFFFAOYSA-N 0.000 description 1
- 150000002892 organic cations Chemical class 0.000 description 1
- 238000006053 organic reaction Methods 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 229910000073 phosphorus hydride Chemical group 0.000 description 1
- 239000002574 poison Substances 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000011027 product recovery Methods 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 125000000547 substituted alkyl group Chemical group 0.000 description 1
- 125000003107 substituted aryl group Chemical group 0.000 description 1
- 238000001308 synthesis method Methods 0.000 description 1
- 230000009974 thixotropic effect Effects 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
- C07C51/42—Separation; Purification; Stabilisation; Use of additives
- C07C51/43—Separation; Purification; Stabilisation; Use of additives by change of the physical state, e.g. crystallisation
- C07C51/44—Separation; Purification; Stabilisation; Use of additives by change of the physical state, e.g. crystallisation by distillation
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
- C07C51/10—Preparation of carboxylic acids or their salts, halides or anhydrides by reaction with carbon monoxide
- C07C51/12—Preparation of carboxylic acids or their salts, halides or anhydrides by reaction with carbon monoxide on an oxygen-containing group in organic compounds, e.g. alcohols
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
- C07C51/42—Separation; Purification; Stabilisation; Use of additives
- C07C51/48—Separation; Purification; Stabilisation; Use of additives by liquid-liquid treatment
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C53/00—Saturated compounds having only one carboxyl group bound to an acyclic carbon atom or hydrogen
- C07C53/08—Acetic acid
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- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Crystallography & Structural Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)
Description
Claims (20)
- カルボニル化可能な反応体のカルボニル化において形成される、アセトアルデヒド、アセトン、メチルエチルケトン、ブチルアルデヒド、クロトンアルデヒド、2−エチルクロトンアルデヒド、2−エチルブチルアルデヒド、及びこれらのアルドール縮合生成物から選択される過マンガン酸還元性化合物(PRC)を低減および/または除去して、酢酸であるカルボニル化生成物を製造する方法であって、
(a)当該カルボニル化生成物を分離して、酢酸を含む蒸気オーバーヘッド流と、より低揮発性の触媒相とを得るステップと、
(b)前記蒸気オーバーヘッド流を蒸留して、精製酢酸生成物と、ヨウ化メチル、水、酢酸、酢酸メチルおよび少なくとも1種のPRCを含む低沸点オーバーヘッド蒸気流とを生成するステップと、
(c)前記低沸点オーバーヘッド蒸気流を凝縮し2相に分離して、凝縮した重液相および凝縮した軽液相を形成するステップと、
(d)前記凝縮した軽液相を単一の蒸留塔内で蒸留して、第2の蒸気相流オーバーヘッドおよびより高沸点の液相残留物を形成するステップであって、前記第2の蒸気相流が、凝縮した軽液相と比較してPRCを多く含むステップと、
(e)前記第2の蒸気相流を凝縮し、水で凝縮流を抽出して、PRCを含む水性アセトアルデヒド流と、ヨウ化メチルを含むラフィネートとを得るステップと、
を含む方法。 - 前記第2の蒸気流中の酢酸メチルおよびメタノールの総濃度が約5重量%未満である、請求項1に記載の方法。
- 高沸点の液相残留物中のアセトアルデヒドの濃度が約0.3重量%未満である、請求項1に記載の方法。
- 前記第2の蒸気相流を、ジメチルエーテルの存在下で抽出する、請求項1に記載の方法。
- ステップ(d)を、酢酸メチルを含む側流を蒸留塔から除くことなく実施し、より高沸点の液相残留物が、前記第2の蒸気相流と比較して酢酸メチルを多く含む、請求項1に記載の方法。
- 前記第2の蒸気流中の酢酸メチルおよびメタノールの総濃度が約5重量%未満である、請求項5に記載の方法。
- 前記のより高沸点の液相残留物中のアセトアルデヒドの濃度が約0.3重量%未満である、請求項5に記載の方法。
- 酢酸メチルを含む側流をステップ(d)の蒸留塔から除くステップをさらに含み、より高沸点の液相残留物および側流の酢酸メチル含有量が、前記第2の蒸気相流と比較して累積的に増加する、請求項1に記載の方法。
- 前記第2の蒸気流中の酢酸メチルおよびメタノールの総濃度が約5重量%未満である、請求項8に記載の方法。
- 前記のより高沸点の液相残留物中のアセトアルデヒドの濃度が約0.3重量%未満である、請求項8に記載の方法。
- カルボニル化可能な反応体のカルボニル化において形成される、アセトアルデヒド、アセトン、メチルエチルケトン、ブチルアルデヒド、クロトンアルデヒド、2−エチルクロトンアルデヒド、2−エチルブチルアルデヒド、及びこれらのアルドール縮合生成物から選択される過マンガン酸還元性化合物(PRC)を低減および/または除去して、酢酸であるカルボニル化生成物を製造する方法であって、
(a)当該カルボニル化生成物を分離して、酢酸を含む蒸気オーバーヘッド流と、より低揮発性の触媒相とを得るステップと、
(b)前記蒸気オーバーヘッド流を蒸留して、精製酢酸生成物と、ヨウ化メチル、水、酢酸、酢酸メチルおよび少なくとも1種のPRCを含む低沸点オーバーヘッド蒸気流とを生成するステップと、
(c)前記低沸点オーバーヘッド蒸気流を凝縮し、2相に分離して、凝縮した重液相および凝縮した軽液相を形成するステップと、
(d)前記凝縮した軽液相を単一の蒸留塔内で蒸留して、第2の蒸気相流オーバーヘッドおよびより高沸点の液相残留物を形成するステップであって、前記第2の蒸気相流が、凝縮した軽液相と比較してPRCを多く含み、より高沸点の液相残留物が、前記第2の蒸気相流オーバーヘッドと比較して酢酸メチルを多く含むステップと、
(e)前記第2の蒸気相流を凝縮し、水で凝縮流を抽出して、PRCを含む水性アセトアルデヒド流とヨウ化メチルを含むラフィネートとを得るステップと、
を含む方法。 - ステップ(d)が、酢酸メチルを含む側流を蒸留塔から除かずに行われる、請求項11に記載の方法。
- 前記第2の蒸気流中の酢酸メチルおよびメタノールの総濃度が約5重量%未満である、請求項12に記載の方法。
- 前記のより高沸点の液相残留物中のアセトアルデヒドの濃度が約0.3重量%未満である、請求項12に記載の方法。
- 酢酸メチルを含む側流をステップ(d)の蒸留塔から除くさらなるステップを含み、より高沸点の液相残留物および側流の酢酸メチル含有量が、前記第2の蒸気相流と比較して累積的に増加する、請求項11に記載の方法。
- 前記第2の蒸気流中の酢酸メチルおよびメタノールの総濃度が約5重量%未満である、請求項15に記載の方法。
- 前記のより高沸点の液相残留物中のアセトアルデヒドの濃度が約0.3重量%未満である、請求項15に記載の方法。
- カルボニル化可能な反応体のカルボニル化において形成される、アセトアルデヒド、アセトン、メチルエチルケトン、ブチルアルデヒド、クロトンアルデヒド、2−エチルクロトンアルデヒド、2−エチルブチルアルデヒド、及びこれらのアルドール縮合生成物から選択される過マンガン酸還元性化合物(PRC)を低減および/または除去して、酢酸であるカルボニル化生成物を製造する方法であって、
(a)当該カルボニル化生成物を分離して、酢酸を含む蒸気オーバーヘッド流と、より低揮発性の触媒相とを得るステップと、
(b)前記蒸気オーバーヘッド流を蒸留して、精製酢酸生成物と、ヨウ化メチル、水、酢酸、酢酸メチルおよび少なくとも1種のPRCを含む低沸点オーバーヘッド蒸気流とを生成するステップと、
(c)前記低沸点オーバーヘッド蒸気流を凝縮し、2相に分離して、凝縮した重液相および凝縮した軽液相を形成するステップと、
(d)前記凝縮した軽液相を単一の蒸留塔内で蒸留して、第2の蒸気相流オーバーヘッドおよびより高沸点の液相残留物を形成するステップであって、前記第2の蒸気相流が、凝縮した軽液相と比較してPRCを多く含むステップと、
(e)酢酸メチルを含む側流を、ステップ(d)の蒸留塔から除くステップであって、より高沸点の液相残留物および側流の酢酸メチル含有量が、前記第2の蒸気相流と比較して累積的に増加するステップと、
(f)前記第2の蒸気相流を凝縮し、水で凝縮流を抽出して、PRCを含む水性アセトアルデヒド流とヨウ化メチルを含むラフィネートとを得るステップと、
を含む方法。 - 前記第2の蒸気流中の酢酸メチルおよびメタノールの総濃度が約5重量%未満である、請求項18に記載の方法。
- 前記のより高沸点の液相残留物中のアセトアルデヒドの濃度が約0.3重量%未満である、請求項18に記載の方法。
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