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A kind of catalytic method of α-pinene hydration reaction

A technology of hydration reaction and catalyst, which is applied in the field of preparation of fine chemicals for forest products, and can solve problems such as failure to achieve environmental friendliness goals

Active Publication Date: 2022-02-22
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem that the existing one-step hydration reaction of α-pinene to prepare α-terpineol either adopts inorganic liquid acid catalysis, or requires chloroacetic acid series organic acids to assist catalysis, and has not achieved the goal of environmental friendliness, the present invention proposes a A method for preparing terpineol by catalyzing the hydration of α-pinene with low-cost acidic / surface-active dual-functional low-temperature co-melt, the method is simple, the catalyst is easy to prepare, and has good catalytic performance and self-separation performance. It does not require other organic acids to assist catalysis, and has good recycling performance, providing an environmentally friendly new method for the preparation of terpineol

Method used

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  • A kind of catalytic method of α-pinene hydration reaction
  • A kind of catalytic method of α-pinene hydration reaction
  • A kind of catalytic method of α-pinene hydration reaction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Add 0.08mol oxalic acid dihydrate (OA·2H 2 O) and 0.08mol betaine (Bet), heated to 80°C, stirred at 500rpm / min for 30min, and obtained a colorless homogeneous acidic / surface active bifunctional low-temperature eutectic catalyst OA·2H 2 O / Bet oily liquid.

[0019] Add 0.14 mol of deionized water and 0.06 mol of α-pinene to the catalyst prepared above, and react at a constant temperature at 500 rpm / min for 8 hours, then place it in an ice-water bath to cool, the lower catalyst phase solidifies, decant to separate the upper product, wash with water It was dried with anhydrous sodium sulfate, and its composition was determined by gas chromatography analysis. The catalytic results obtained are shown in Table 1.

Embodiment 2

[0021] Add 0.08mol oxalic acid dihydrate (OA·2H 2 O) and 0.04mol betaine (Bet), heated to 80°C, stirred and reacted at 500rpm / min for 30min, and obtained a colorless homogeneous acidic / surface active bifunctional low-temperature eutectic catalyst 2OA·2H 2 O / Bet oily liquid.

[0022] Add 0.14 mol of deionized water and 0.06 mol of α-pinene to the catalyst prepared above, and react at a constant temperature at 500 rpm / min for 8 hours, then place it in an ice-water bath to cool, the lower catalyst phase solidifies, decant to separate the upper product, wash with water It was dried with anhydrous sodium sulfate, and its composition was determined by gas chromatography analysis. The catalytic results obtained are shown in Table 1.

Embodiment 3

[0024] Add 0.08mol oxalic acid dihydrate (OA·2H 2 O) and 0.032mol betaine (Bet), heated to 80°C, stirred and reacted at 500rpm / min for 30min, and obtained a colorless homogeneous acidic / surface active bifunctional low-temperature eutectic catalyst 2.5OA·2H 2 O / Bet oily liquid.

[0025] Add 0.14 mol of deionized water and 0.06 mol of α-pinene to the catalyst prepared above, and react at a constant temperature at 500 rpm / min for 8 hours, then place it in an ice-water bath to cool, the lower catalyst phase solidifies, decant to separate the upper product, wash with water It was dried with anhydrous sodium sulfate, and its composition was determined by gas chromatography analysis. The catalytic results obtained are shown in Table 1.

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Abstract

The invention relates to an environment-friendly method for catalyzing the hydration reaction of α-pinene. Specifically, a low-cost acidic / surface-active dual-functional low-temperature co-melt is used as a catalyst to catalyze the hydration reaction of α-pinene to prepare α-pine oil The method for alcohol belongs to the technical field of preparation of fine chemicals for forest products. The present invention aims at the reaction process characteristics of the one-step hydration of α-pinene to prepare terpineol, uses the cheap natural carboxylic acid oxalic acid with dicarboxylic groups as the hydrogen bond donor and the acid functional component, and uses the natural zwitterionic surfactant betaine as the hydrogen Bond acceptor, design and preparation of low-temperature eutectic catalyst xOA·2H with suitable acid properties and surface activity 2 O / Bet, the catalyst preparation process is simple, atom-economical and environmentally friendly. At the catalytic reaction temperature, the catalyst is miscible with water and exhibits liquid-liquid two-phase catalytic reaction characteristics with organic raw materials. After the reaction is completed and cooled to below 10°C, the catalyst and water condense into a uniform solid, and the organic phase can be directly separated by decantation. The method provided by the present invention has a simple reaction process, does not require other organic acids to assist catalysis, can simultaneously realize the effectiveness of catalyzing the α-pinene hydration reaction and the simplicity of separation, and provides an economical and green process for the one-step hydration reaction of α-pinene method.

Description

technical field [0001] The present invention relates to a new environment-friendly method for catalyzing the hydration reaction of α-pinene, in particular to the preparation of α-terpineol by catalyzing the hydration reaction of α-pinene with a low-cost acidic / surface-active dual-functional low-temperature co-melt The method belongs to the technical field of preparation of forest product fine chemicals. Background technique [0002] α-pinene is the main terpene compound in my country's rich turpentine resources. The double bond and ring structure in the structure make it more active. Among them, α-terpineol produced by hydration reaction with water can be used in medicine It is a very important fine chemical in the , pesticide, plastic and ink industries (Anaerobe, 2012, 18(3): 369-372). The industrial production of α-terpineol from α-pinene mainly uses corrosive equipment, inorganic acid and organic acid catalysts that produce a large amount of waste pollution, and the cata...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C29/04C07C33/14B01J31/02
CPCC07C29/04B01J31/0239B01J31/0271C07C2602/42
Inventor 袁冰解从霞张东强于凤丽于世涛
Owner QINGDAO UNIV OF SCI & TECH