ES387405A1 - Procedure for obtaining dimethyl terthtalate of high purity. (Machine-translation by Google Translate, not legally binding) - Google Patents
Procedure for obtaining dimethyl terthtalate of high purity. (Machine-translation by Google Translate, not legally binding)Info
- Publication number
- ES387405A1 ES387405A1 ES387405A ES387405A ES387405A1 ES 387405 A1 ES387405 A1 ES 387405A1 ES 387405 A ES387405 A ES 387405A ES 387405 A ES387405 A ES 387405A ES 387405 A1 ES387405 A1 ES 387405A1
- Authority
- ES
- Spain
- Prior art keywords
- high purity
- acid
- dimethyl terephthalate
- translation
- carboxybenzaldehyde
- 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
Landscapes
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
Process for obtaining dimethyl terephthalate of high purity, having an acid number of the order of 0.01 to 0.03 and a freezing point of 140.62 to l40.63º c, characterized in that it comprises esterifying terephthalic acid that has below 10 ppm of 4-carboxybenzaldehyde and 20,000 ppm of p-toluic acid, with methanol, the weight ratio of the respective reactants being from 1.0: 2.0 to 5.0 at a temperature in the range of 200 to 350ºC and a pressure of 35 to 350 kg/cm2 relative; distilling off methanol and water byproduct of the resulting ester product, leaving a liquid residue of crude dimethyl terephthalate having, as ester impurities, methyl esters of 4-carboxybenzaldehyde and p-toluic acid at a temperature in the range of 140 to 215º c; and rectifying the liquid waste at a pressure of 12 to 760 mm hg, in three fractions consisting of a first, impure fraction, in an amount of 1 to 3% of the liquid residue containing the methyl esters of 4-carboxybenzaldehyde and acid p -tolical, a second fraction consisting of said dimethyl terephthalate of high purity, in an amount of 1.14 to 1.16 with respect to the weight of terephthalic acid and a tail fraction containing 50-90% of monomethyl terephthalate and 10-50% dimethyl terephthalate, on a weight basis. (Machine-translation by Google Translate, not legally binding)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US373370A | 1970-01-19 | 1970-01-19 |
Publications (1)
Publication Number | Publication Date |
---|---|
ES387405A1 true ES387405A1 (en) | 1973-05-01 |
Family
ID=21707319
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
ES387405A Expired ES387405A1 (en) | 1970-01-19 | 1971-01-19 | Procedure for obtaining dimethyl terthtalate of high purity. (Machine-translation by Google Translate, not legally binding) |
Country Status (1)
Country | Link |
---|---|
ES (1) | ES387405A1 (en) |
-
1971
- 1971-01-19 ES ES387405A patent/ES387405A1/en not_active Expired
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