- Highly Efficient Iridium-Catalyzed Production of Hydrogen and Lactate from Glycerol: Rapid Hydrogen Evolution by Bimetallic Iridium Catalysts
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Mono- and bimetallic iridium complexes involving novel triscarbene ligands were synthesized and applied to the dehydrogenation of biomass-derived glycerol. This resulted in affording hydrogen and lactate with the excellent turnover number (TON; 3,240,000) and turnover frequency (TOF; 162,000 h–1). The triscarbene ligand in a single frame allowed the formation of bimetallic iridium complexes. This induced the cooperative effect of two iridium ions and rendered excellent TONs and TOFs in the production of hydrogen and lactate.
- Cheong, Yeon-Joo,Sung, Kihyuk,Kim, Jin-A,Kim, Yu Kwon,Jang, Hye-Young
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p. 4064 - 4068
(2020/09/12)
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- Preparation methods of tiopronin and zinc complex of tiopronin
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The invention discloses preparation methods of tiopronin and zinc complex of tiopronin and belongs to the technical field of a medicine compound for relieving acute/chronic liver diseases. The technical scheme is characterized in that the formula is shown in the specification. The operation is simple, the cost of raw materials is low, the repeatability of experimental results of a process route is higher, and the production cost can be remarkably reduced.
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Paragraph 0028; 0029
(2017/02/24)
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- Method for producing potassium lactate from heavy-component lactic acid
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The invention discloses a method for producing potassium lactate from heavy-component lactic acid. Particularly, the heavy-component lactic acid is pumped into a reaction tank, potassium hydroxide is pumped in a stirring state for a reaction, the temperature of a reaction system is kept at the temperature of 40-60 DEG C, adding of potassium hydroxide is stopped when the pH (potential of hydrogen) value of a reaction liquid is 6.5-7.5, and potassium lactate is obtained; deionized water is added to a completely reacted potassium lactate solution, the mass concentration of potassium lactate is controlled to range from 20% to 25%, and a roughly filtered potassium lactate solution is pumped into a nanofiltration membrane unit for filtration; during filtration by the nanofiltration membrane unit, penetrating fluids are collected independently and then continuously pumped into a triple-effect concentration section for concentration, trapped fluids flow back to a raw material container, the feeding speed is controlled, when the content of discharged potassium lactate is controlled in the range from 60% to 63%, discharged potassium lactate is pumped into a finished product tank, and a production process of potassium lactate can be completed. The technological process is mild, the material loss is small, and the comprehensive preparation cost (not containing the cost of heavy-component lactic acid and potassium hydroxide raw material) is smaller than 300 yuan per ton.
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Paragraph 0019-0027
(2017/02/23)
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- Robust Iridium Coordination Polymers: Highly Selective, Efficient, and Recyclable Catalysts for Oxidative Conversion of Glycerol to Potassium Lactate with Dihydrogen Liberation
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Along with the rapid expansion of the biodiesel industry to deal with the world energy crisis, inexpensive glycerol is also produced in large scale as the main byproduct in biodiesel production via transesterification. Much attention has been paid to the development of environmentally benign technologies for the transformation of glycerol to valuable DL-lactic acid and its derivatives. Herein, a series of NHC-Ir coordination polymers were readily synthesized via reaction of some structurally rigid bis-benzimidazolium salts with iridium precursors under alkaline conditions and were successfully applied as robust self-supported catalysts in the oxidative dehydrogenation of glycerol to potassium lactate with dihydrogen liberation. Extremely high activity and selectivity were attained in open air under the mild reaction conditions even with ppm-level loadings of the catalysts, which were readily recovered after reaction by simple filtration and reused for up to 31 runs without obvious loss of activity or selectivity. Probably owing to the effective suppression of inactive binuclear iridium species in a homogeneously catalyzed reaction, the catalysts assembled via self-supported strategy exhibited high selectivity and productivity for potassium lactate, with up to 1.24 × 105 turnover numbers (TON) being attained even in large-scale reactions of neat glycerol at an elevated temperature. The high catalytic activity, recyclability, and scalability of the robust self-supported catalysts highlight their potential toward the development of practical technologies for transformation of glycerol to value-added chemicals.
- Sun, Zheming,Liu, Yaoqi,Chen, Jiangbo,Huang, Changyu,Tu, Tao
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p. 6573 - 6578
(2015/11/23)
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- Ruthenium-catalyzed hydrogen generation from glycerol and selective synthesis of lactic acid
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An efficient hydrogen generation from glycerol and selective synthesis of lactic acid (67%) using pincer-type ruthenium complexes is described. Analysis of the products from glycerol dehydrogenation indicates that improving the efficiency of the decarboxylation step is a key point for further reforming processes.
- Li, Yang,Nielsen, Martin,Li, Bin,Dixneuf, Pierre H.,Junge, Henrik,Beller, Matthias
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supporting information
p. 193 - 198
(2018/04/16)
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- PROCESS FOR PRODUCING AND PURIFYING A CONCENTRATED LACTIC SALT
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The present disclosure relates to a process for preparing a lactic salt from a lactide starting material. In particular, the present disclosure is directed to the production of potassium lactate, wherein the potassium lactate has a desirable neutral odor and a concentration greater than 75%, and wherein the potassium lactate possesses desirable properties for food applications.
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Page/Page column 3
(2012/08/27)
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- Synthesis and characterization of some bis(hydroxyalkyl)- and bis(hydroxyester)-functionalized disiloxanes
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Novel hydroxyester disiloxanes (1,3-bis(6-hydroxyhexa noylmethyl)-1,1,3,3- tetramethyl disiloxane and 3-bis(2-hydroxypropanoylmethyl)tetramethyl disiloxane) were synthesized, and preparation of other known monomers, namely 1,3-bis(hydroxypropyl)-1,1,3,3-tetramethyl disiloxane, 1,3- bis(hydroxyethoxypropyl)-1,1,3,3-tetramethyl disiloxane and 1,3- bis(hydroxymethyl)-1,1,3,3-tetramethyl disiloxane was developed to obtain better yields and reduce production time and expense. All compounds were characterized by infrared spectroscopy, using 1H NMR, 13C NMR, and 29Si NMR and were reacted with diisocyanates, resulting in poly(siloxane-urethane) copolymers with unique properties.
- Pusztai, Erika,Nagy, Jozsef,Wagner, Oedoen
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- Condensed phase preparation of 2,3-pentanedione
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A condensed phase process for the preparation of purified 2,3-pentanedione from lactic acid and an alkali metal lactate is described. The process uses elevated temperatures between about 200° to 360° C. for heating a reaction mixture of lactic acid and an alkali metal lactate to produce the 2,3-pentanedione in a reaction vessel. The 2,3-pentanedione produced is vaporized from the reaction vessel and condensed with water.
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