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Date: 3-9-2017
831
Date: 29-8-2017
875
Date: 18-8-2017
943
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Isoprene Synthesis From Acetylene and Acetone
A three-step process developed by Snamprogetti is based on the reaction of acetylene and acetone in liquid ammonia in the presence of an alkali metal hydroxide. The product, methylbutynol, is then hydrogenated to methylbutenol followed by dehydration at 250–300°C over an acidic heterogeneous catalyst.
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"عادة ليلية" قد تكون المفتاح للوقاية من الخرف
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ممتص الصدمات: طريقة عمله وأهميته وأبرز علامات تلفه
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المجمع العلمي للقرآن الكريم يقيم جلسة حوارية لطلبة جامعة الكوفة
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