GB932246A - Purification of phthalic acids - Google Patents
Purification of phthalic acidsInfo
- Publication number
- GB932246A GB932246A GB3830159A GB3830159A GB932246A GB 932246 A GB932246 A GB 932246A GB 3830159 A GB3830159 A GB 3830159A GB 3830159 A GB3830159 A GB 3830159A GB 932246 A GB932246 A GB 932246A
- Authority
- GB
- United Kingdom
- Prior art keywords
- acid
- phthalic acid
- phthalic
- resulting solution
- xylene
- 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
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
A process for purifying crude terephthalic or isophthalic acid obtained by the sulphurammonia oxidation of p-xylene or m-xylene respectively, comprises the steps of forming the ammonium salt of the acid by intimately mixing the crude phthalic acid with an aqueous solution of ammonium hydroxide, contacting the resulting solution with activated carbon, adding the resulting solution to a second acid having an ionisation constant greater than that of the phthalic acid thereby precipatating the phthalic acid and separating and washing the phthalic acid. The acid used for precipitating the phthalic acid may be, for example, hydrochloric, sulphuric, sulphurous or acetic acids. The terephthalic acid purified in accordance with the invention may be used for direct esterification with ethylene glycol. Specification 932,244 is referred to.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US77460958A | 1958-11-18 | 1958-11-18 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB932246A true GB932246A (en) | 1963-07-24 |
Family
ID=25101755
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB3830159A Expired GB932246A (en) | 1958-11-18 | 1959-11-11 | Purification of phthalic acids |
Country Status (6)
Country | Link |
---|---|
BE (1) | BE584755A (en) |
CH (1) | CH388922A (en) |
DE (1) | DE1117100B (en) |
FR (1) | FR1244576A (en) |
GB (1) | GB932246A (en) |
NL (1) | NL245503A (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6013835A (en) | 1995-06-07 | 2000-01-11 | Hfm International, Inc. | Method and apparatus for preparing purified terephthalic acid |
US5929274A (en) | 1995-06-07 | 1999-07-27 | Hfm International, Inc. | Method to reduce carboxybenzaldehyde isomers in terephthalic acid or isophthalic acid |
US6054610A (en) | 1995-06-07 | 2000-04-25 | Hfm International, Inc. | Method and apparatus for preparing purified terephthalic acid and isophthalic acid from mixed xylenes |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB695170A (en) * | 1950-09-07 | 1953-08-05 | Bofors Ab | Method of purifying organic compounds |
DE1025875B (en) * | 1954-08-18 | 1958-03-13 | Basf Ag | Process for the separation of accompanying substances from crystalline substances |
GB777782A (en) * | 1955-06-24 | 1957-06-26 | Ici Ltd | Purification of terephthalic acid |
-
0
- NL NL245503D patent/NL245503A/xx unknown
-
1959
- 1959-11-11 GB GB3830159A patent/GB932246A/en not_active Expired
- 1959-11-16 FR FR810281A patent/FR1244576A/en not_active Expired
- 1959-11-17 BE BE584755A patent/BE584755A/en unknown
- 1959-11-17 CH CH8067059A patent/CH388922A/en unknown
- 1959-11-18 DE DEC20199A patent/DE1117100B/en active Pending
Also Published As
Publication number | Publication date |
---|---|
DE1117100B (en) | 1961-11-16 |
CH388922A (en) | 1965-03-15 |
NL245503A (en) | |
FR1244576A (en) | 1960-10-28 |
BE584755A (en) | 1960-05-17 |
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