SU888814A3 - Method of preparing dimethylterephthalate - Google Patents
Method of preparing dimethylterephthalate Download PDFInfo
- Publication number
- SU888814A3 SU888814A3 SU792789705A SU2789705A SU888814A3 SU 888814 A3 SU888814 A3 SU 888814A3 SU 792789705 A SU792789705 A SU 792789705A SU 2789705 A SU2789705 A SU 2789705A SU 888814 A3 SU888814 A3 SU 888814A3
- Authority
- SU
- USSR - Soviet Union
- Prior art keywords
- methanol
- esterification
- oxidation
- product
- xylene
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
- C07C51/16—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation
- C07C51/21—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation with molecular oxygen
- C07C51/255—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation with molecular oxygen of compounds containing six-membered aromatic rings without ring-splitting
- C07C51/265—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation with molecular oxygen of compounds containing six-membered aromatic rings without ring-splitting having alkyl side chains which are oxidised to carboxyl groups
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Polyesters Or Polycarbonates (AREA)
Abstract
Description
1one
Изобретение относитс к области органического смнтеза, конкретно к способу получени диметилтерефталатаважного химического продукта.This invention relates to the field of organic synthesis, specifically to a process for the preparation of a dimethyl terephthalate chemical product.
Известен способ получени димети- s лового эфира терефталевой кислоты, заключающийс в окислении п-ксилола и метилового эфира п-толуиловой кислоты кислородсодержащим газом при повышенной температуре в присутствии ю в качестве катализатора солей кобальта или марганца, с последующим выделением продукта и рециркул цией непрореагировавшего метилового эфира п-толуилрвой ки:споты на стадию окисле- laA known method for producing terephthalic acid dimethyl ester involves oxidizing p-xylene and p-toluic acid methyl ester with oxygen-containing gas at elevated temperatures in the presence of u as a catalyst for cobalt or manganese salts, followed by separation of the product and recycling unreacted methyl ester p-toluenera: spots on the stage of oxidation - la
HMBflJ.HMBflJ.
Недостатком известного способа вл етс недостаточно высока селективность процесса за счет побочных реакций образовани муравьиной и уксусной 20 кислот и углекислого газа.The disadvantage of this method is that the selectivity of the process is not high enough due to side reactions of the formation of formic and acetic acids 20 and carbon dioxide.
Наиболее близким по технической сущности и достигаемому результату вл етс способ получени диметилтерефталата путем окислени смеси п-кси-25The closest in technical essence and the achieved result is a method for producing dimethyl terephthalate by oxidation of a mixture of p-xi-25
лола и метилового эфира п-толуиловои кислоты воздухом при 150-170С и давлении атм в присутствии катализатора - смеси ацетатов кобальта и марганца с последующей этерификацией полученного продукта метанолом 2 .lol and p-toluic acid methyl ester with air at 150–170 ° C and atm pressure in the presence of a catalyst — a mixture of cobalt and manganese acetates followed by esterification of the resulting product with methanol 2.
Выход целевого продукта 8k вес.%.The yield of the target product is 8k wt.%.
Недостатком известного способа вл етс сравнительно низка селективность процесса вследствие потерь за счет образовани таких побочных продуктов , как муравьина кислота, уксусна кислота и двуокись углерода,что приводит к снижению выхода целевого продукта.The disadvantage of this method is the relatively low selectivity of the process due to losses due to the formation of such by-products as formic acid, acetic acid and carbon dioxide, which leads to a decrease in the yield of the target product.
Цель изобретени заключаетс в повышении выхода целевого продукта.The purpose of the invention is to increase the yield of the target product.
Claims (2)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2833585A DE2833585C2 (en) | 1978-07-31 | 1978-07-31 | Process for the production of dimethyl terephthalate |
Publications (1)
Publication Number | Publication Date |
---|---|
SU888814A3 true SU888814A3 (en) | 1981-12-07 |
Family
ID=6045871
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SU792789705A SU888814A3 (en) | 1978-07-31 | 1979-07-27 | Method of preparing dimethylterephthalate |
Country Status (8)
Country | Link |
---|---|
JP (1) | JPS5520799A (en) |
BR (1) | BR7904873A (en) |
DE (1) | DE2833585C2 (en) |
FR (1) | FR2432497A1 (en) |
IT (1) | IT1162371B (en) |
NL (1) | NL7905873A (en) |
PL (1) | PL116680B1 (en) |
SU (1) | SU888814A3 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57141826U (en) * | 1981-02-24 | 1982-09-06 | ||
JPH07108479B2 (en) * | 1992-09-21 | 1995-11-22 | 日清紡績株式会社 | Press machine |
-
1978
- 1978-07-31 DE DE2833585A patent/DE2833585C2/en not_active Expired
-
1979
- 1979-07-24 FR FR7919071A patent/FR2432497A1/en not_active Withdrawn
- 1979-07-27 SU SU792789705A patent/SU888814A3/en active
- 1979-07-30 PL PL1979217474A patent/PL116680B1/en unknown
- 1979-07-30 BR BR7904873A patent/BR7904873A/en unknown
- 1979-07-30 NL NL7905873A patent/NL7905873A/en not_active Application Discontinuation
- 1979-07-30 IT IT49897/79A patent/IT1162371B/en active
- 1979-07-31 JP JP9690179A patent/JPS5520799A/en active Pending
Also Published As
Publication number | Publication date |
---|---|
PL116680B1 (en) | 1981-06-30 |
FR2432497A1 (en) | 1980-02-29 |
PL217474A1 (en) | 1980-03-24 |
DE2833585B1 (en) | 1979-12-13 |
BR7904873A (en) | 1980-05-06 |
JPS5520799A (en) | 1980-02-14 |
NL7905873A (en) | 1980-02-04 |
IT7949897A0 (en) | 1979-07-30 |
IT1162371B (en) | 1987-03-25 |
DE2833585C2 (en) | 1980-08-14 |
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