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Date: 16-8-2017
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Date: 18-8-2017
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Date: 21-8-2017
1770
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Isoprene Synthesis From Isobutylene and Methylal (Sun Oil Process)
In this process, methylal (dimethoxymethane) is used instead of formaldehyde. The advantage of using methylal over formaldehyde is its lower reactivity toward 1-butene than formaldehyde, thus allowing mixed feedstocks to be used. Also, unlike formaldehyde, methylal does not decompose to CO and H2.
The first step in this process is to produce methylal by the reaction of methanol and formaldehyde using an acid catalyst.
The second step is the vapor phase reaction of methylal with isobutene to produce isoprene. 2-Butene in the C4 mixture also reacts with methylal but at a slower rate to give isoprene. 1-Butene reacts slowly to give 1,3-pentadiene.
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دراسة يابانية لتقليل مخاطر أمراض المواليد منخفضي الوزن
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اكتشاف أكبر مرجان في العالم قبالة سواحل جزر سليمان
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المجمع العلمي ينظّم ندوة حوارية حول مفهوم العولمة الرقمية في بابل
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