GB1056319A - Terephthalic acid recovery - Google Patents
Terephthalic acid recoveryInfo
- Publication number
- GB1056319A GB1056319A GB5037364A GB5037364A GB1056319A GB 1056319 A GB1056319 A GB 1056319A GB 5037364 A GB5037364 A GB 5037364A GB 5037364 A GB5037364 A GB 5037364A GB 1056319 A GB1056319 A GB 1056319A
- Authority
- GB
- United Kingdom
- Prior art keywords
- acetic acid
- terephthalic acid
- crystals
- mixture
- liquid phase
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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
- C07C51/42—Separation; Purification; Stabilisation; Use of additives
- C07C51/43—Separation; Purification; Stabilisation; Use of additives by change of the physical state, e.g. crystallisation
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Crystallography & Structural Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
Terephthalic acid is recovered from a liquid reaction mixture obtained by the catalytic oxidation of a para-disubstituted benzene in the liquid phase with molecular oxygen in acetic acid as reaction medium by heating the liquid phase reaction mixture to 500 DEG to 600 DEG F. under a pressure sufficient to maintain a liquid phase of acetic acid sufficient to dissolve all the solids present, cooling the mixture to 300 DEG to 350 DEG F. under pressure sufficient to maintain a liquid acetic acid phase to crystallize out terephthalic acid, separating the terephthalic acid crystals at 300 DEG to 350 DEG F., washing the crystals with acetic acid and drying the washed crystals. Specified starting materials are p-dialkylbenzenes and p-alkyl-benzoic acids. The catalyst preferably comprises bromine and a heavy metal oxidation catalyst of A.W. 50 to 200, e.g. cobalt or manganese. The weight ratio of acetic acid to p-xylene in the starting mixture is 1 : 1 to 10 : 1 and when the ratio is less than 6 : 1 addition acetic acid is added prior to heating to 500 DEG to 600 DEG F. so that acetic acid is present in amounts of 6 to 10 parts by weight per part of total solids. The term total solids is defined. The terephthalic acid crystals have an average diameter not exceeding 300 microns. Hydrogen may be introduced into a reactive mixture which contains catalytic amounts of Co or Mn during the heating step to cause hydrogenation of 4-carboxybenzaldehyde.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US32987763A | 1963-12-11 | 1963-12-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1056319A true GB1056319A (en) | 1967-01-25 |
Family
ID=23287402
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB5037364A Expired GB1056319A (en) | 1963-12-11 | 1964-12-10 | Terephthalic acid recovery |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JPS4826750B1 (en) |
| BE (1) | BE656940A (en) |
| DE (1) | DE1297092B (en) |
| GB (1) | GB1056319A (en) |
| NL (1) | NL143900B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4675438A (en) * | 1978-11-17 | 1987-06-23 | Amoco Corporation | Direct continuous flow integration of production and purification of high purity iso- or terephthalic acid |
| EP0457606A1 (en) * | 1990-05-17 | 1991-11-21 | Mitsubishi Gas Chemical Company, Inc. | Process for producing highly pure isophthalic acid |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52136897U (en) * | 1976-04-12 | 1977-10-18 | ||
| ITBO20150180A1 (en) * | 2015-04-14 | 2016-10-14 | Sacmi Cooperativa Mecc Imola Soc Coop A R L | APPARATUS AND METHOD OF OPTICAL INSPECTION OF OBJECTS, IN PARTICULAR METALLIC LIDS. |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2744938A (en) * | 1952-07-24 | 1956-05-08 | Universal Oil Prod Co | Removal of color impurities from organic compounds |
| US2838565A (en) * | 1953-07-17 | 1958-06-10 | Ici Ltd | Purification of terephthalic acid |
| FR1137203A (en) * | 1954-12-15 | 1957-05-27 | Ici Ltd | Purification of terephthalic acid |
| GB781936A (en) * | 1955-02-25 | 1957-08-28 | Ici Ltd | Purification of terephthalic acid |
| DE1047192B (en) * | 1956-12-21 | 1958-12-24 | Hoechst Ag | Process for the purification of microcrystalline terephthalic acid by crystal enlargement |
| GB835721A (en) * | 1957-10-23 | 1960-05-25 | Ici Ltd | Purification of terephthalic acid |
-
0
- BE BE656940D patent/BE656940A/xx unknown
-
1964
- 1964-12-10 NL NL6414383A patent/NL143900B/en not_active IP Right Cessation
- 1964-12-10 GB GB5037364A patent/GB1056319A/en not_active Expired
- 1964-12-11 DE DEST23071A patent/DE1297092B/en active Pending
- 1964-12-11 JP JP6947564A patent/JPS4826750B1/ja active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4675438A (en) * | 1978-11-17 | 1987-06-23 | Amoco Corporation | Direct continuous flow integration of production and purification of high purity iso- or terephthalic acid |
| EP0457606A1 (en) * | 1990-05-17 | 1991-11-21 | Mitsubishi Gas Chemical Company, Inc. | Process for producing highly pure isophthalic acid |
| US5189209A (en) * | 1990-05-17 | 1993-02-23 | Mitsubishi Gas Chemical Company, Inc. | Process for producing highly pure isophthalic acid |
Also Published As
| Publication number | Publication date |
|---|---|
| BE656940A (en) | |
| NL6414383A (en) | 1965-06-14 |
| DE1297092B (en) | 1969-06-12 |
| NL143900B (en) | 1974-11-15 |
| JPS4826750B1 (en) | 1973-08-15 |
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