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A technology of butyl lactate and lactic acid, which is applied in the field of butyl lactate preparation, can solve the problems of poor product color, strong corrosion of equipment, and many side reactions
Inactive Publication Date: 2011-04-27
尹华芳
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Problems solved by technology
In the industry, concentrated sulfuric acid is usually used to catalyze the synthesis of butyl lactate, but this method has many side reactions, the color of the product is not good, and it is highly corrosive to equipment and seriously pollutes the environment.
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Embodiment 1
[0010] Catalyst preparation
[0011] Immerse 100g of activated clay in 200g of 30% sulfuric acid, and stir at room temperature for 8 hours, filter out the activated clay, dry it in an oven at 120°C for 2 hours, take it out and place it in a desiccator ready for use. In the process of preparing the catalyst, the dosage of sulfuric acid is 2 to 5 times the mass of activated clay, and the stirring time at normal temperature is 8 to 20 hours.
[0012] Preparation of butyl lactate
[0013] In the flask, add 90g of lactic acid, 81.4g of butanol, 180g of toluene and 4.5g of catalyst, connect to the water separator, heat and reflux for 8 hours, and evaporate the toluene and butanol under reduced pressure for recycling. The reaction system was lowered to normal temperature, and the catalyst was removed by filtration to obtain 142 g of butyl lactate with a yield of 97.2%.
Embodiment 2
[0015] Catalyst preparation
[0016] Immerse 100g of activated clay in 500g of 5% sulfuric acid, and stir at room temperature for 20 hours, filter out the activated clay, dry it in an oven at 80°C for 6 hours, take it out and place it in a desiccator ready for use.
[0017] Preparation of butyl lactate
[0018] In the flask, add 90g of lactic acid, 148g of butanol, 360g of toluene and 15g of catalyst, connect the water separator, heat and reflux the reaction for 4 hours, evaporate the toluene and butanol under reduced pressure and recover them for reuse. After steaming, the reaction system After cooling down to normal temperature, the catalyst was removed by filtration to obtain 144 g of butyl lactate with a yield of 98.6%.
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Abstract
The invention relates to a preparation method of butyl lactate. The method comprises the following steps of: adding lactic acid, butanol, toluene and a catalyst into a flask according to a certain proportion; connecting a water konckout vessel; heating and performing a reflux reaction for a certain period of time; decompressing and evaporating so as to recycle toluene and butanol; after evaporation, cooling a reaction system to normal temperature; and removing the catalyst by filtering so as to obtain the butyl lactate, wherein the catalyst is an active argil supported catalyst. In the method, high-purity butyl lactate can be obtained; moreover, active argil has water absorbing and decoloring effects, so that the reaction is more complete and a product is attractive; simultaneously, a catalyst neutralizing step can be eliminated.
Description
technical field [0001] The present invention relates to a kind of preparation method of butyl lactate. Background technique [0002] Butyl lactate is an important spice and industrial solvent. It is a colorless and stable liquid with a sweet creamy and milky aroma. It is mainly used to prepare dairy products, cheese and butterscotch flavors. It is widely used in medicine, food, coatings, electronics, etc. etc. In industry, concentrated sulfuric acid is usually used to catalyze the synthesis of butyl lactate, but this method has many side reactions, the color of the product is not good, and it is highly corrosive to equipment and seriously pollutes the environment. [0003] In view of the current industrial situation, the present invention adopts activated clay impregnated catalyst to catalyze the synthesis of butyl lactate. This method can obtain butyl lactate with high purity, and the activated clay has the effect of water absorption and decolorization, so that the reactio...
Claims
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Application Information
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