2,2,4-trimethyl-1,3-pentanediol monoisobutyrate (CS-12) is a non-water-soluble diol ester and an emerging green additive, widely used in paint industry. It can be synthesized by isobutyraldehyde with alkali as catalyst. In this article, several catalysts were studied for the synthesis of CS-12, for example, sodium hydroxide, calcium hydroxide, the mixture of sodium hydroxide and calcium hydroxide, sodium methoxide, the solution of sodium methoxide and methanol, and sodium ethoxide. Sodium hydroxide was finally selected as the optimal catalyst for the reaction. The effect of the amount of catalyst, reaction temperature and reaction time on the reaction were investigated by orthogonal experiments. The final optimal conditions are as follows: the catalyst dosage is 2 %, the reaction temperature is 50 °C, the reaction time is 4h. Under these conditions, the conversion of isobutyraldehyde is 93.10%, the selectivity of target product is 92.98%.
NaY zeolite was prepared by a simple sol-gel process. The prepared NaY was characterized by XRD,FT-IR,N2adsorption/desorption isotherms, and scanning electron microscope (SEM). The CO2dynamic adsorption/desorption performance of NaY was tested under atmospheric pressure using adsorption curve method in the fixed bed. The results demonstrate that NaY offeres high separation efficiency for CO2against N2. To further identify the most adsorption conditions, different adsorption temperatures and gas flow rates were investigated respectively. It is shown that NaY zeolite has the largest adsorption capacity of 88 mg/g adsorbent at 60°C,50ml/min, and the sample maintains still strong adsorption capacity and stable structure during 6 consecutive test cycles, which exhibits its stable adsorption/desorption behavior.
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