GB1000488A - Method of testing terephthalic acid to be converted into polyethylene terephthalate - Google Patents
Method of testing terephthalic acid to be converted into polyethylene terephthalateInfo
- Publication number
- GB1000488A GB1000488A GB1280162A GB1280162A GB1000488A GB 1000488 A GB1000488 A GB 1000488A GB 1280162 A GB1280162 A GB 1280162A GB 1280162 A GB1280162 A GB 1280162A GB 1000488 A GB1000488 A GB 1000488A
- Authority
- GB
- United Kingdom
- Prior art keywords
- terephthalic acid
- dry weight
- batch
- purity
- barium salt
- 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
- C07C63/00—Compounds having carboxyl groups bound to a carbon atoms of six-membered aromatic rings
- C07C63/14—Monocyclic dicarboxylic acids
- C07C63/15—Monocyclic dicarboxylic acids all carboxyl groups bound to carbon atoms of the six-membered aromatic ring
- C07C63/26—1,4 - Benzenedicarboxylic acid
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
- C08G63/02—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds
- C08G63/12—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from polycarboxylic acids and polyhydroxy compounds
- C08G63/16—Dicarboxylic acids and dihydroxy compounds
- C08G63/18—Dicarboxylic acids and dihydroxy compounds the acids or hydroxy compounds containing carbocyclic rings
- C08G63/181—Acids containing aromatic rings
- C08G63/183—Terephthalic acids
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Polyesters Or Polycarbonates (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
A batch of terephthalic acid is tested to determine its suitability for conversion into polyethylene terephthalate by converting a small portion of the batch of dry weight W to its normal barium salt, ascertaining the dry weight A of the barium salt thus obtained, calculating the purity of the batch from the formula Purity (%) = A x 0.551 x 100/W + correction factor, where the correction factor = 100 - A1 x 0.551 x 100/W1 where W1 is the dry weight of a portion of pure terephthalic acid and A1 is the dry weight of the normal barium salt of said portion of pure terephthalic and rejecting the batch if its purity is thus found to be less than 99%. Terephthalic acid of suitable purity may be made by the process of Specification 825,375. The purified terephthalic acid may be converted into polyethylene terephthalate by esterifying it under pressure with ethylene glycol in the presence of titanium dioxide and cobaltous acetate and polymerizing the product in the presence of antimony oxide and phosphorous acid. Specifications 747,204 and 825,375 are referred to.ALSO:A batch of terephthalic acid is tested to determine its purity by converting a small portion of the batch of dry weight W to its normal barium salt, ascertaining the dry weight A of the barium salt thus obtained and calculating the purity from the formula:- <FORM:1000488/B1-B2/1> where W1 is the dry weight of a portion of pure terephthalic acid and A1 is the dry weight of the normal barium salt of said portion of pure terephthalic acid. If the purity is 99% or more the batch is converted to polyethylene terephthalate (see Division C3). The barium salt is made by dissolving the terephthalic acid in aqueous sodium hydroxide solution and precipitating the salt by adding an aqueous solution of barium acetate and acetic acid. Specifications 747,204 and 825,375 are referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1367261 | 1961-04-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1000488A true GB1000488A (en) | 1965-08-04 |
Family
ID=11839671
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1280162A Expired GB1000488A (en) | 1961-04-17 | 1962-04-03 | Method of testing terephthalic acid to be converted into polyethylene terephthalate |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE1520988A1 (en) |
| GB (1) | GB1000488A (en) |
-
1962
- 1962-04-03 GB GB1280162A patent/GB1000488A/en not_active Expired
- 1962-04-12 DE DE19621520988 patent/DE1520988A1/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| DE1520988A1 (en) | 1969-11-27 |
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