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Date: 6-9-2017
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Date: 10-9-2017
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Date: 22-8-2017
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Terephthalic Acid from Benzoic Acid
Terephthalic acid is an important monomer for producing polyesters. The main route for obtaining the acid is the catalyzed oxidation of paraxylene. It can also be produced from benzoic acid by a disproportionation reaction of potassium benzoate in the presence of carbon dioxide. Benzene is the coproduct:
The reaction occurs in a liquid-phase process at approximately 400°C using ZnO or CdO catalysts. Terephthalic acid is obtained from an acid treatment; the potassium salt is recycled.
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دراسة: حفنة من الجوز يوميا تحميك من سرطان القولون
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تنشيط أول مفاعل ملح منصهر يستعمل الثوريوم في العالم.. سباق "الأرنب والسلحفاة"
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الطلبة المشاركون: مسابقة فنِّ الخطابة تمثل فرصة للتنافس الإبداعي وتنمية المهارات
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