RO81804B - PROCEDURE FOR OBTAINING DIMETHYLTEREFTALATE FROM LIQUID HEAVY RESIDUES - Google Patents
PROCEDURE FOR OBTAINING DIMETHYLTEREFTALATE FROM LIQUID HEAVY RESIDUESInfo
- Publication number
- RO81804B RO81804B RO103771A RO10377181A RO81804B RO 81804 B RO81804 B RO 81804B RO 103771 A RO103771 A RO 103771A RO 10377181 A RO10377181 A RO 10377181A RO 81804 B RO81804 B RO 81804B
- Authority
- RO
- Romania
- Prior art keywords
- dimethyltereftalate
- procedure
- obtaining
- oxidation
- thermal treatment
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C67/00—Preparation of carboxylic acid esters
- C07C67/39—Preparation of carboxylic acid esters by oxidation of groups which are precursors for the acid moiety of the ester
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C67/00—Preparation of carboxylic acid esters
- C07C67/48—Separation; Purification; Stabilisation; Use of additives
- C07C67/60—Separation; Purification; Stabilisation; Use of additives by treatment giving rise to chemical modification
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Catalysts (AREA)
Abstract
Inventia se refera la un procedeu pentru obtinerea dimetiltereftalatului din reziduuri care au punct de fierbere, reziduri rezultate din procesul de oxidare în aer a ptoluenului împreuna cu eterul metilic al acidului p-toluic în prezenta de catalizator de oxidare la temperatura de 140...180 degree C si presiune de 3...11 at, în faza fluida, urmata de esterificarea acizilor obtinuti cu metanol si de separare prin distilarea esterilor formati, apoi extractia catalizatorilor de oxidare din reziduu prin tratare termica la temperaturi de 220...300 degree C, tratarea termica efectuîndu-se în prezenta de 0,02...4% în greutate de catalizator de disociere ales dintre acetilacetonat de fier, acetilacetonat de magneziu, acetat de zinc, dupa care se distileaza dimetiltereftalatul si se recircula produsele intermediare.The invention relates to a process for the preparation of dimethyl terephthalate from boiling residues, residues resulting from the oxidation process of ptooluen together with p-toluic acid methyl ether in the presence of an oxidation catalyst at a temperature of 140-180 grade C and a pressure of 3 to 11 in the fluid phase followed by esterification of the acids obtained with methanol and separation by distillation of the formed esters and then extraction of the oxidation catalysts from the residue by thermal treatment at temperatures of 220 ... 300 ° C C, the thermal treatment being carried out in the presence of 0.02-4 wt.% Of the dissociation catalyst selected from iron acetylacetonate, magnesium acetylacetonate, zinc acetate, after which the dimethyl terephthalate is distilled and the intermediate products recirculated.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3011175A DE3011175C2 (en) | 1980-03-22 | 1980-03-22 | Process for the production of dimethyl terephthalate and intermediate products of DMT production |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| RO81804A RO81804A (en) | 1984-04-02 |
| RO81804B true RO81804B (en) | 1984-04-30 |
Family
ID=6098062
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| RO103771A RO81804B (en) | 1980-03-22 | 1981-03-20 | PROCEDURE FOR OBTAINING DIMETHYLTEREFTALATE FROM LIQUID HEAVY RESIDUES |
Country Status (8)
| Country | Link |
|---|---|
| BR (1) | BR8101662A (en) |
| DE (1) | DE3011175C2 (en) |
| FR (1) | FR2478628A1 (en) |
| IT (1) | IT1170830B (en) |
| NL (1) | NL8101387A (en) |
| PL (1) | PL230235A1 (en) |
| RO (1) | RO81804B (en) |
| SU (1) | SU980613A3 (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH605591A5 (en) * | 1974-06-14 | 1978-09-29 | Teijin Hercules Chem Co Ltd | Dimethyl terephthalate and inters recovery |
-
1980
- 1980-03-22 DE DE3011175A patent/DE3011175C2/en not_active Expired
-
1981
- 1981-03-13 SU SU813254446A patent/SU980613A3/en active
- 1981-03-19 FR FR8105528A patent/FR2478628A1/en not_active Withdrawn
- 1981-03-20 PL PL23023581A patent/PL230235A1/xx unknown
- 1981-03-20 IT IT48070/81A patent/IT1170830B/en active
- 1981-03-20 NL NL8101387A patent/NL8101387A/en not_active Application Discontinuation
- 1981-03-20 BR BR8101662A patent/BR8101662A/en unknown
- 1981-03-20 RO RO103771A patent/RO81804B/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| IT8148070A1 (en) | 1982-09-20 |
| PL230235A1 (en) | 1981-11-13 |
| SU980613A3 (en) | 1982-12-07 |
| BR8101662A (en) | 1981-09-22 |
| IT1170830B (en) | 1987-06-03 |
| RO81804A (en) | 1984-04-02 |
| DE3011175A1 (en) | 1981-10-01 |
| FR2478628A1 (en) | 1981-09-25 |
| DE3011175C2 (en) | 1982-06-09 |
| IT8148070A0 (en) | 1981-03-20 |
| NL8101387A (en) | 1981-10-16 |
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