Synthesis of lactic acid from dihydroxyacetone: use of alkaline-earth metal hydroxides

2013 ◽  
Vol 3 (5) ◽  
pp. 1380 ◽  
Author(s):  
Susanne Lux ◽  
Matthäus Siebenhofer
Keyword(s):  
Lactic Acid ◽  
Alkaline Earth ◽  
Earth Metal ◽  
Alkaline Earth Metal ◽  
Metal Hydroxides

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.

Synthesizing Alkaline Earth Metal Hydroxides Nanoparticles through an Innovative, Single-Step and Eco-Friendly Method

2019 ◽  
Vol 286 ◽  
pp. 3-14 ◽  
Author(s):  
Giuliana Taglieri ◽  
Valeria Daniele ◽  
Ludovico Macera
Keyword(s):  
Alkaline Earth ◽  
Aqueous Suspension ◽  
Exchange Process ◽  
Earth Metal ◽  
Single Step ◽  
Alkaline Earth Metal ◽  
Monoclinic Crystal ◽  
Metal Hydroxides ◽  
Crystal Lattices ◽  
Ion Exchange Process

The objective of this paper is to introduce a patented and eco-friendly method to synthesize aqueous suspension of all types of alkaline-earth metal hydroxides nanoparticles (NPs). This method is based on an ion exchange process; the exchange takes place at ambient temperature/pressure, starts from cheap or renewable reagents and, in one single step, results in the creation of the crystalline desired nanoparticles in only a few minutes. In terms of structural and morphological features, the synthesized nanoparticles are characterized by means of XRD-Rietveld refinement, FTIR, and TEM. In particular, we obtained pure and crystalline magnesium and calcium hydroxide suspensions, showing the typical brucite crystal structure with a hexagonal lamellar morphology and dimensions generally <100 nm. With respect to the strontium and barium hydroxide suspensions, we observed different kinds of hydroxides (either anhydrous and hydrate forms), characterized by orthorhombic or monoclinic crystal lattices with rod-like nanostructured morphologies. Despite the different morphologies, all synthesized nanoparticles appear constituted by a superimposition of primary nanoparticles, of dimensions ranging from a few to 15 nm, correlated to the increase in the atomic number of the alkaline earth metal.

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