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Synthesis of 3-methyl-3-buten-1-ol by Prins Condensation Over Molecular Sieve Catalysts

Author: YangChao
Tutor: JinXingMei
School: East China University of Science and Technology
Course: Industrial Catalysis
Keywords: ZSM-5 Prins condensation Fixed bed Stability
CLC: TQ223.12
Type: Master's thesis
Year: 2011
Downloads: 156
Quote: 0
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Abstract


Accounted for about world pesticides market 19%～20%, pyrethroid pesticides become conventional varieties of the pesticides. The usage of the pyrethroid pesticides is less to the organic phosphoric pesticides presently.3-methyl-3-buten-l-ol was synthesized through heterogeneous catalysis by Prins condensation with 2-methyl propene and paraformaldehyde. This Process conditions are simple and easy to industrialize, have a broad development prospects. It has great economic and social benefits.It can get good results to use phosphate catalyst in Prins condensation reaction in a batch autoclave reactor. But batch reaction simply adapt to small batch fine production. To realize large-scale production, it must be carried out in fixed bed reaction process. In the article, we overcome the difficulty of separating the product and the catalyst, reducing the degree of environmental pollution, and improving the production efficiency by using the ZSM-5 in the fixed bed.Studying on process conditions in fixed bed reactorn shows that the yield of the reaction was the largest when reacted at 240℃, volume airspeed 0.5h-1 and pressure 6-7MPa.During catalyst stabilization evaluation, the activity of the catalyst declined significantly after 36 hours recycle use. It has better stability than phosphate catalyst.

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CLC: > Industrial Technology > Chemical Industry > Basic Organic Chemistry Industry > The production of aliphatic compounds ( acyclic compounds) > Aliphatic alcohols (alcohols, hydroxy compounds) and its derivatives > Aliphatic alcohol > Fatty Alcohols
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