Terephthalic acid synthesis at higher concentrations in high-temperature liquid water. 2. Eliminating undesired byproducts
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چکیده
منابع مشابه
Terephthalic Acid Synthesis at Higher Concentrations in High-Temperature Liquid Water. 2. Eliminating Undesired Byproducts
We synthesized terephthalic acid (TPA) from p-xylene at an initial concentration above its solubility limit in high-temperature liquid water (HTW). The nominal p-xylene loading at the reaction conditions was 0.4 mol L , which is the highest reported to date for generation of high TPA yields ([70 mol %) in HTW. The presence of two liquid phases during the reaction did not appear to accelerate th...
متن کاملTerephthalic Acid Synthesis at Higher Concentrations in High-Temperature Liquid Water. 1. Effect of Oxygen Feed Method
We conducted terephthalic acid (TPA) synthesis from p-xylene in high-temperature liquid water (HTW) at 3008C. The p-xylene concentration at the reaction condition was 0.2 mol L, which is the highest to date in research that achieved at least 80 mol % yields of TPA in HTW. Pure oxygen gas was the oxidant. Increasing the MnBr2 catalyst concentration increased the rate of TPA formation only slight...
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In the title compound, 2C(8)H(6)O(4)·C(10)H(8)N(2), the 4,4'-bipyridine mol-ecule is located on an inversion centre. In the crystal structure, strong inter-molecular O-H⋯N hydrogen bonds between the terephthalic acid and 4,4'-bipyridine mol-ecules lead to the formation of chains with graph-set motif C(2) (2)(8) along the diagonal of the bc plane.
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In the title compound, 2C(8)H(7)N(3)·C(8)H(6)O(4)·2H(2)O, the pyridine and pyrazole rings are approximately coplanar, the dihedral angle between them being 4.69 (9)°. The asymmetric unit consists of half of the terephthalic acid (an inversion centre generates the other half of the mol-ecule), one 4-(1H-pyrazol-3-yl)pyridine (4pp) mol-ecule and one water mol-ecule. In the crystal, two 4pp and on...
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The asymmetric unit of the title compound, C(12)H(14)N(4)·C(8)H(6)O(4)·4H(2)O, consists of one half of the 1,4-bis-(4,5-dihydro-1H-imidazol-2-yl)benzene (bib) mol-ecule, one half of the terephthalic acid (TA) mol-ecule and two water mol-ecules. Both the bib and the TA mol-ecules reside on crystallographic inversion centers, which coincide with the centroids of the respective benzene rings. The ...
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ژورنال
عنوان ژورنال: AIChE Journal
سال: 2009
ISSN: 0001-1541,1547-5905
DOI: 10.1002/aic.11761