Selective conversion of lactic acid to acrylic acid over alkali and alkaline-earth metal co-modified NaY zeolites

2017 ◽  
Vol 7 (24) ◽  
pp. 6101-6111 ◽  
Author(s):  
Lili Zhang ◽  
De Sheng Theng ◽  
Yonghua Du ◽  
Shibo Xi ◽  
Lin Huang ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Acrylic Acid ◽  
Alkaline Earth ◽  
Earth Metal ◽  
Environmentally Friendly ◽  
Catalytic Process ◽  
Alkaline Earth Metal ◽  
Selective Conversion ◽  
Nay Zeolites

A high AA selectivity of 84% was achieved through an environmentally friendly and sustainable catalytic process.

Interaction of Alkaline Earth Metal Ions with Acetic and Lactic Acid in Aqueous Solutions Studied by 13C NMR Spectroscopy

1997 ◽  
Vol 52 (4) ◽  
pp. 351-357 ◽  
Author(s):  
A. Kondoh ◽  
T. Oi
Keyword(s):  
Lactic Acid ◽  
Nmr Spectroscopy ◽  
Metal Ion ◽  
Alkaline Earth ◽  
Isotope Effects ◽  
Earth Metal ◽  
Ion Concentration ◽  
Alkaline Earth Metal ◽  
Hydroxyl Groups ◽  
Alkaline Earth Metal Ions

Abstract Interaction of alkaline earth metal (magnesium, calcium, strontium and barium) ions with acetic and lactic acid in aqueous media was investigated by 13C NMR spectroscopy. In the acetate systems, signals whose chemical shifts were the averages of those of the free and bound acetate ions were observed. Downfield shifts of the carboxylate carbon signals with increasing metal ion concentration indicated that the acetate ion acted as a monodentate ligand coordinating to the metal ion using the carboxylate group. The metal ion concentration dependence of the peak positions of the methine and carboxylate carbon signals of the lactate ion in the lactate systems suggested that the lactate ion coordinated to a metal ion using the carboxylate and hydroxyl groups. Unique upfield shifts upon complexation in the magnesium lactate systems suggested that the lactate ion coordinated to the magnesium ion from outside the primary hydration sphere.The present results were consistent with the isotope effects of the alkaline earth metals observed in cation exchange chromatography.

scholarly journals Effect of Solid Bases Catalyst on Conversion of Acrylonitrile into Acrylic Acid by Hydrothermal Reaction

2020 ◽  
Vol 194 ◽  
pp. 04017
Author(s):  
Chang Yue ◽  
Haixia Ye ◽  
Xuejun Yang ◽  
Ke Wang ◽  
Jia Miao ◽  
...  
Keyword(s):  
Acrylic Acid ◽  
Alkaline Earth ◽  
Hydrothermal Reaction ◽  
Earth Metal ◽  
Alkaline Earth Metal ◽  
Solid Base ◽  
Solid Base Catalysts ◽  
Base Catalysts ◽  
Effect Of Treatment ◽  
Short Time

This study aims at the shortcomings of the current industrial application of acrylonitrile wastewater treatment, using alkali-catalyzed hydrothermal technology to convert acrylonitrile into acrylic acid for achieving resource utilization. In this study, alkali metal, alkaline earth metal hydroxide and composite solid base were used as catalysts to investigate catalytic effects of these solid based on the hydrothermal reaction. The results show when using the alkali and alkaline-earth metal hydroxides as catalysts, the best effect of treatment was KOH and the highest yield of acrylic acid reached 56.60%. It was also found that, among the three kinds of solid base catalysts (Ca-O-Mg, K-O-Al, K-O-Si) adopted with the same mass and various loading capacity, K-O-Si (15%) was the most effective catalyst for the conversion of acrylonitrile, and the highest yield of acrylic acid reached 57.78%. This process provides an environmentally friendly method toward the synthesis of useful acrylic acid from acrylonitrile within a very short time.

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