Unsaturated acetal preparation method

An unsaturated and acetal technology, which is applied in the field of preparation of high boiling point unsaturated acetal, can solve the problems of increased side reactions, strong corrosion of lithium chloride, high cost, etc., to achieve increased reaction rate, stable process state, and equipment requirements low effect
CN102942460BActive Publication Date: 2014-09-17WANHUA CHEM GRP CO LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
WANHUA CHEM GRP CO LTD
Publication Date
2014-09-17

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Abstract

The present invention discloses an unsaturated acetal preparation method. According to the preparation method, an unsaturated alcohol and an unsaturated aldehyde are subjected to a reaction in a pre-reactor to achieve a thermodynamic equilibrium, and then enter a tower type reactor, a water carrying agent is subjected to gasification through a gas generator, and then is subjected to reverse contact with a reaction liquid, and the water generated from the reaction is removed, such that the unsaturated alcohol and the unsaturated aldehyde are subjected to a continuous condensation reaction to prepare the unsaturated acetal. The preparation method has the following characteristics that: the method can be performed under a normal pressure condition, the reaction temperature is constant, low cost synthesis of the unsaturated acetal can be achieved, particularly 3-methyl-2-buten-1-ol and 3-methyl-2-butenal can be adopted as raw materials to synthesize 3-methyl-2-butenal-1 diisopentenyl acetal, wherein the compound is an important intermediate of a synthetic perfume citral.
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Description

technical field

[0001] The invention relates to a preparation method of unsaturated acetal, in particular to a preparation method of high boiling point unsaturated acetal. Background technique

[0002] Unsaturated acetal is an important intermediate in the synthesis of plastics, spices and vitamins, usually using nitric acid, phosphoric acid or lithium chloride as a catalyst, and is produced by reactive distillation under negative pressure conditions. The relevant patents are as follows:

[0003] BASF adopts nitric acid (concentration is 1×10 -6 ~1 wt%) is used as a catalyst to carry out the reaction at a reaction pressure of 2-200 mmHg (absolute pressure) and a temperature of 15-100°C. The solution of unsaturated alcohol, unsaturated aldehyde and nitric acid is added to the reaction system from the middle of the tower, the water generated by the reaction is removed through the oil-water separator, the organic phase is refluxed, and the acetal generated by the reaction accu...

Claims

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