A Novel Route to One-step Formation of ɛ-caprolactam from Cyclohexane and Nitrosyl Sulfuric Acid Catalyzed by VPO Composites

2007 ◽  
Vol 118 (1-2) ◽  
pp. 129-133 ◽  
Author(s):  
Kuiyi You ◽  
Bohua Wu ◽  
Liqiu Mao ◽  
Dulin Yin ◽  
Pingle Liu ◽  
...  
Keyword(s):  
Sulfuric Acid ◽  
One Step ◽  
Acid Catalyzed

The Research on Synthetic Method of Starch/Lactic Acid Graft Copolymer Catalyzed with Sulfuric Acid

2014 ◽  
Vol 472 ◽  
pp. 874-878
Author(s):  
Ming Ru Tang ◽  
Ying Mo Hu ◽  
Xu Bo Chen ◽  
Qing Ling Wang
Keyword(s):  
Lactic Acid ◽  
Sulfuric Acid ◽  
Corn Starch ◽  
Graft Copolymerization ◽  
Synthetic Method ◽  
H Nmr ◽  
One Step ◽  
Acid Catalyzed ◽  
Grafting Copolymer ◽  
Grafting Degree

The starch/lactic acid grafting copolymer has been prepared by one-step reaction of corn starch with lactic acid catalyzed with sulfuric acid, and the structure of product was characterized by IR, XRD, SEM and1H-NMR. The experimental results showed that sulfuric acid could catalyze the graft copolymerization of starch with lactic acid, and the grafting degree of starch could reach 55.4%.

One-step synthesis of ε-caprolactam from cyclohexane and nitrosyl sulfuric acid catalyzed by VPO supported transition metal composites

2008 ◽  
Vol 9 (11-12) ◽  
pp. 2136-2139 ◽  
Author(s):  
Kuiyi You ◽  
Liqiu Mao ◽  
Lei Chen ◽  
Dulin Yin ◽  
Pingle Liu ◽  
...  
Keyword(s):  
Sulfuric Acid ◽  
Transition Metal ◽  
Metal Composites ◽  
One Step ◽  
Acid Catalyzed

Esterification Deacidification of Zanthoxylum Bungeanum Seed Oil

2012 ◽  
Vol 512-515 ◽  
pp. 1615-1618
Author(s):  
Jian Zhang ◽  
Xuan Jun Wang
Keyword(s):  
Sulfuric Acid ◽  
Reaction Time ◽  
Seed Oil ◽  
Acid Value ◽  
Biodiesel Production ◽  
Molar Ratio ◽  
One Step ◽  
Acid Catalyzed ◽  
Zanthoxylum Bungeanum ◽  
Acid Esterification

Effects of mole rate of methanol/oil, reaction time and technology on the free fatty acid ( FFA) level decrease of Zanthoxylum bungeanum seed oil with sulfuric acid as catalyst was investigated. Results show that, the acid level decreases with the mole rate of methanol/oil increases when the sulfuric acid is 2% based on the weight of Zanthoxylum bungeanum seed oil and reacting at 60°C for 2h. When the mole rate is 20~35∶1, the final acid value is less than 2mgKOH/g which meets the requirement for biodiesel production. When the mole rate is 25∶1, with sulfuric acid dosage 2% and reacting at 60°C, the acid value decreases fast at the beginning of the acid esterification. The acid value of ZSO was reduced to 1.56 mg KOH/g from 78.91 mg KOH/g by only one-step acid-catalyzed esterification with methanol-to-oil molar ratio 30:1, H2SO4 2%, temperature 60°C and reaction time 60 min, which was selected as optimum for the acid-catalyzed esterification.

scholarly journals Hydrothermal Pretreatment of Wheat Straw: Effects of Temperature and Acidity on Byproduct Formation and Inhibition of Enzymatic Hydrolysis and Ethanolic Fermentation

Agronomy ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 487
Author(s):  
Dimitrios Ilanidis ◽  
Stefan Stagge ◽  
Leif J. Jönsson ◽  
Carlos Martín
Keyword(s):  
Mass Spectrometry ◽  
Sulfuric Acid ◽  
Wheat Straw ◽  
High Performance ◽  
Enzymatic Saccharification ◽  
Hydrothermal Pretreatment ◽  
Gas Chromatography Mass Spectrometry ◽  
Enzymatic Digestibility ◽  
Acid Catalyzed ◽  
Pretreatment Conditions

Biochemical conversion of wheat straw was investigated using hydrothermal pretreatment, enzymatic saccharification, and microbial fermentation. Pretreatment conditions that were compared included autocatalyzed hydrothermal pretreatment at 160, 175, 190, and 205 °C and sulfuric-acid-catalyzed hydrothermal pretreatment at 160 and 190 °C. The effects of using different pretreatment conditions were investigated with regard to (i) chemical composition and enzymatic digestibility of pretreated solids, (ii) carbohydrate composition of pretreatment liquids, (iii) inhibitory byproducts in pretreatment liquids, (iv) furfural in condensates, and (v) fermentability using yeast. The methods used included two-step analytical acid hydrolysis combined with high-performance anion-exchange chromatography (HPAEC), HPLC, ultra-high performance liquid chromatography-electrospray ionization-triple quadrupole-mass spectrometry (UHPLC-ESI-QqQ-MS), and pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS). Lignin recoveries in the range of 108–119% for autocatalyzed hydrothermal pretreatment at 205 °C and sulfuric-acid-catalyzed hydrothermal pretreatment were attributed to pseudolignin formation. Xylose concentration in the pretreatment liquid increased with temperature up to 190 °C and then decreased. Enzymatic digestibility was correlated with the removal of hemicelluloses, which was almost quantitative for the autocatalyzed hydrothermal pretreatment at 205 °C. Except for the pretreatment liquid from the autocatalyzed hydrothermal pretreatment at 205 °C, the inhibitory effects on Saccharomyces cerevisiae yeast were low. The highest combined yield of glucose and xylose was achieved for autocatalyzed hydrothermal pretreatment at 190 °C and the subsequent enzymatic saccharification that resulted in approximately 480 kg/ton (dry weight) raw wheat straw.

ChemInform Abstract: Broensted Acid Catalyzed C-C Bond Forming Reaction for One-Step Synthesis of Oxazinanones.

ChemInform ◽  
2011 ◽  
Vol 42 (47) ◽  
pp. no-no
Author(s):  
Nazim Uddin ◽  
Joseph S. Ulicki ◽  
F. Holger Foersterling ◽  
M. Mahmun Hossain
Keyword(s):  
Bond Forming ◽  
One Step ◽  
Acid Catalyzed

Antiaminic agents derived from thieno[2,3-c]-2-benzothiepin: 4-(1-Methyl-4-piperidylidene)-4,9-dihydrothieno[2,3-c]-2-benzothiepin and some related compounds

1983 ◽  
Vol 48 (2) ◽  
pp. 623-641 ◽  
Author(s):  
Zdeněk Polívka ◽  
Miroslav Rajšner ◽  
Jan Metyš ◽  
Jiří Holubek ◽  
Emil Svátek ◽  
...  
Keyword(s):  
Clinical Trials ◽  
Sulfuric Acid ◽  
Title Compound ◽  
Amino Alcohol ◽  
Hydrogen Sulfate ◽  
Geometric Isomers ◽  
Pure Alcohol ◽  
Acid Catalyzed ◽  
Anticataleptic Activity ◽  
Related Compounds

In the reaction of thieno[2,3c]-2-benzothiepin-4(9H)-one (VI) with 1-methyl-4-piperidylmagnesium chloride 7-(1-methyl-4-piperidyl)thieno[2,3-c]-2-benzothiepin-4(9H)-one (VIII) is formed in addition to the expected amino alcohol VII. The title compound I was obtained by the acid catalyzed dehydration of the pure alcohol VII. Compound I (pipethiadene) has outstanding antihistamine, antiserotonin, antireserpine and anticataleptic activity and was recommended to clinical trials as a potential antimigraine agent. For pharmacokinetic and metabolic studies there were prepared the NC2H3 analogue of pipethiadene IV and further, as potential metabolites, the demethyl analogue III, S-oxide X, demethyl S-oxide XI, N-oxide XIII and N,S-dioxide XIV. The Witting reaction of the ketone VI with 3-dimethylaminopropylidenetriphenylphosphorane resulted in a mixture of geometric isomers of 4-(3-dimethylamino-propylidene)-4,9-dihydrothieno[2,3-c]-2-benzothiepin with the strongly predominating Z-isomer XVI which was isolated from the mixture by crystallization of the hydrogen maleate. The mixture with the predominating Z-isomer XVI was converted by the treatment with 80% sulfuric acid and dilution with water to a mixture with the predominating E-isomer XV (dithiadene) which was isolated by crystallization of the hydrogen sulfate. Some further new thieno[2,3-c]-2-benzothiepin derivatives were synthesized as potential intermediates.

Synergistic effect of co-reactant promotes one-step oxidation of cyclohexane into adipic acid catalyzed by manganese porphyrins

2015 ◽  
Vol 93 (7) ◽  
pp. 696-701 ◽  
Author(s):  
Hui Li ◽  
Yuanbin She ◽  
Haiyan Fu ◽  
Meijuan Cao ◽  
Jing Wang ◽  
...  
Keyword(s):  
Synergistic Effect ◽  
Co Oxidation ◽  
Adipic Acid ◽  
Molar Ratio ◽  
Reaction Conditions ◽  
Catalyst Structure ◽  
Manganese Porphyrins ◽  
Co Oxidation Reaction ◽  
One Step ◽  
Acid Catalyzed

The synergistic effect of cyclohexane and cyclohexanone promoted synthesis of adipic acid catalyzed by [MnIIIT(p-Cl)PP]Cl with cyclohexane and cyclohexanone as co-reactants. The results showed that the conversions of cyclohexane and cyclohexanone were significantly enhanced because of the cyclohexanone synergistic effect, and the higher selectivity to adipic acid was obtained with dioxygen as an oxidant. The studies indicated that the co-oxidation of cyclohexane and cyclohexanone was influenced by the initial molar ratio of cyclohexanone and cyclohexane, catalyst structure, catalyst concentrations, and reaction conditions. The preliminary mechanism of the co-oxidation reaction of cyclohexane and cyclohexanone using [MnIIIT(p-Cl)PP]Cl as the catalyst was proposed.

Jervine. V. The Sulfuric Acid-catalyzed Acetolysis of Diacetyltetrahydrojervine

1954 ◽  
Vol 76 (22) ◽  
pp. 5609-5616 ◽  
Author(s):  
O. Wintersteiner ◽  
M. Moore ◽  
B. M. Iselin
Keyword(s):  
Sulfuric Acid ◽  
Acid Catalyzed
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