scholarly journals PERACETIC ACID OXIDATION OF HALOGENATED AZOBENZENES

1959 ◽  
Vol 37 (2) ◽  
pp. 366-369 ◽  
Author(s):  
Paul E. Gagnon ◽  
Brian T. Newbold
Keyword(s):  
Hydrogen Peroxide ◽  
Acetic Acid ◽  
Peracetic Acid ◽  
Glacial Acetic Acid ◽  
Acid Oxidation ◽  
Azoxy Compounds

A series of dihalogenated and five tetrachloroazobenzenes were oxidized to the corresponding azoxy compounds by means of 30% hydrogen peroxide in glacial acetic acid, the reaction being carried out at about 60–70 °C, for 24 hoursAs expected, the yields, in general, obtained from azobenzenes containing substituents in the 2,2′-positions were lower than those from compounds having substituents in the 3,3′- and 4,4′-positions, which gave very good results.

Research on Modified Rubbers. Part IV. The Oxidation of Rubber with Aqueous Hydrogen Peroxide-Acetic Acid Mixtures

1934 ◽  
Vol 7 (3) ◽  
pp. 454-461
Author(s):  
G. F. Bloomfield ◽  
E. H. Farmer
Keyword(s):  
Hydrogen Peroxide ◽  
Acetic Acid ◽  
Peracetic Acid ◽  
Glacial Acetic Acid ◽  
Chloroform Solution ◽  
Effective Control ◽  
Acid Mixture ◽  
Hydroxyl Groups ◽  
Derivatives Of ◽  
Degree Of Degradation

Abstract Mair and Todd (J. Chem. Soc., 1932,, 386), in extending the earlier work of Robertson and Mair (J. Soc. Chem. Ind., 46, 41T (1927)), studied the interaction of a chloroform solution of purified rubber with concentrated hydrogen peroxide (100 vols.) dissolved in glacial acetic acid; by this means they obtained a non-acidic substance of the empirical formula C50H92O16, which was unsaturated toward bromine and permanganate, and was considered to have all its oxygen present in the form of hydroxyl groups. Other workers have reported that when peracetic acid dissolved in glacial acetic acid is used in place of the hydrogen peroxide—acetic acid mixture, the products of reaction are acetylated derivatives of rubber (British Patent 369,716). These acetylated derivatives are stated to be obtainable either from solid rubber or from solutions of rubber, but no evidence as to their constitution has been advanced. Now the oxidative degradation of rubber is of considerable interest from two points of view: first, with regard to the light which it may throw on the size, structure, homogeneity, and normality of chemical behavior of the molecules of rubber; and, second, with regard to its efficacy as a means of transforming rubber into derivatives of similar or smaller molecular weight, capable of useful application in industry. The very careful work of Mair and Todd has gone far to show that hydrogen peroxide under the conditions of their experiments attacks the unsaturated centers of the rubber molecule and effects more or less complete hydroxylation of the carbon chain; at the same time it brings about a considerable degree of degradation of the molecule. The product of Mair and Todd, however, is produced under rather restricted conditions of reaction and the reagents employed are costly; consequently the extent to which the character of the product can be modified (i. e., by controlling the degree of degradation, hydroxylation, and acetylation) is left undetermined, and the possibility of producing useful materials at a reasonably low cost by modifying the conditions of reaction and the form of reactants is left unexplored. On the other hand, the employment of peracetic acid as an oxidizing agent, though offering a theoretically elegant way of effecting hydroxylation or acetoxylation at the unsaturated centers of the rubber molecule, is not without drawbacks: the preparation of the reagent is expensive and on a large scale dangerous; moreover, in spite of the fact that it is claimed to be employable either with solutions of rubber or with solid rubber, its reaction with rubber is so vigorous that the prospect of exercising any effective control over the extent of degradation or degree of hydroxylation (acetoxylation) is greatly diminished.

scholarly journals Self-generated peroxyacetic acid in phosphoric acid plus hydrogen peroxide pretreatment mediated lignocellulose deconstruction and delignification

2021 ◽  
Vol 14 (1) ◽  
Author(s):  
Dong Tian ◽  
Yiyi Chen ◽  
Fei Shen ◽  
Maoyuan Luo ◽  
Mei Huang ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Acetic Acid ◽  
Synergistic Effect ◽  
Phosphoric Acid ◽  
Wheat Straw ◽  
Lignin Degradation ◽  
Acid Oxidation ◽  
Main Function ◽  
Corn Stalk ◽  
Peroxyacetic Acid

Abstract Background Peroxyacetic acid involved chemical pretreatment is effective in lignocellulose deconstruction and oxidation. However, these peroxyacetic acid are usually artificially added. Our previous work has shown that the newly developed PHP pretreatment (phosphoric acid plus hydrogen peroxide) is promising in lignocellulose biomass fractionation through an aggressive oxidation process, while the information about the synergistic effect between H3PO4 and H2O2 is quite lack, especially whether some strong oxidant intermediates is existed. In this work, we reported the PHP pretreatment system could self-generate peroxyacetic acid oxidant, which mediated the overall lignocellulose deconstruction, and hemicellulose/lignin degradation. Results The PHP pretreatment profile on wheat straw and corn stalk were investigated. The pathways/mechanisms of peroxyacetic acid mediated-PHP pretreatment were elucidated through tracing the structural changes of each component. Results showed that hemicellulose was almost completely solubilized and removed, corresponding to about 87.0% cellulose recovery with high digestibility. Rather high degrees of delignification of 83.5% and 90.0% were achieved for wheat straw and corn stalk, respectively, with the aid of peroxyacetic acid oxidation. A clearly positive correlation was found between the concentration of peroxyacetic acid and the extent of lignocellulose deconstruction. Peroxyacetic acid was mainly self-generated through H2O2 oxidation of acetic acid that was produced from hemicellulose deacetylation and lignin degradation. The self-generated peroxyacetic acid then further contributed to lignocellulose deconstruction and delignification. Conclusions The synergistic effect of H3PO4 and H2O2 in the PHP solvent system could efficiently deconstruct wheat straw and corn stalk lignocellulose through an oxidation-mediated process. The main function of H3PO4 was to deconstruct biomass recalcitrance and degrade hemicellulose through acid hydrolysis, while the function of H2O2 was to facilitate the formation of peroxyacetic acid. Peroxyacetic acid with stronger oxidation ability was generated through the reaction between H2O2 and acetic acid, which was released from xylan and lignin oxidation/degradation. This work elucidated the generation and function of peroxyacetic acid in the PHP pretreatment system, and also provide useful information to tailor peroxide-involved pretreatment routes, especially at acidic conditions. Graphical abstract

A new method for the preparation of peroxymonophosphoric acid

2003 ◽  
Vol 81 (2) ◽  
pp. 156-160 ◽  
Author(s):  
Tian Zhu ◽  
Hou-min Chang ◽  
John F Kadla
Keyword(s):  
Hydrogen Peroxide ◽  
Acetic Acid ◽  
Carbon Tetrachloride ◽  
Glacial Acetic Acid ◽  
Acid Synthesis ◽  
Conversion Ratio ◽  
New Method ◽  
Phosphorous Pentoxide ◽  
Preparation Conditions ◽  
Peroxy Acids

A new method for the preparation of peroxymonophosphoric acid (H3PO5) has been developed. It utilizes a biphasic solution to moderate the vigorous reaction between phosphorous pentoxide (P2O5) and hydrogen peroxide (H2O2). P2O5 is suspended in carbon tetrachloride (CCl4), and concentrated H2O2 is slowly added while being vigorously stirred at low temperature. Careful control of the reaction temperature through the slow addition of H2O2 is critical. Using typical preparation conditions (P2O5:H2O2 = 0.5:1, H2O2 70 wt %, 2°C, 120–180 min), ~70% of the H2O2 is effectively converted to H3PO5. Increasing the concentration of H2O2, as well as the mole ratio of P2O5:H2O2, leads to an even higher % conversion of H2O2 to H3PO5. The addition of glacial acetic acid to the P2O5:H2O2 suspension at the end of the 120–180 min reaction (P2O5:H2O2:CH3COOH = 0.5:1:0.3) leads to the formation of peracetic acid in addition to H3PO5, and to an overall increase in the conversion ratio of total peroxy acids based on H2O2 (>95%).Key words: peroxymonophosphoric acid, synthesis, stability, conversion ratio.

Synthesized WO3/ZrO2 Nanocomposite as the Catalyst for Preparation of Peracetic Acid

2011 ◽  
Vol 287-290 ◽  
pp. 1727-1730 ◽  
Author(s):  
Mei Li ◽  
Zhi Ming Chen
Keyword(s):  
Hydrogen Peroxide ◽  
Acetic Acid ◽  
Lewis Acid ◽  
Peracetic Acid ◽  
Pyridine Adsorption ◽  
Nanosized Material ◽  
Adsorption Desorption ◽  
Structural Characterizations ◽  
Surfactant Assisted

Nanosized material tungstate zirconia (WO3/ZrO2) was prepared by surfactant -assisted precipitation. Structural characterizations of the catalyst were performed by N2adsorption– desorption and FTIR pyridine adsorption spectroscopy. Preparation of peracetic acid (PAA) from acetic acid (AA) and hydrogen peroxide (HP) under the catalysis of Lewis acid WO3/ZrO2was investigated.

scholarly journals Respiratory Symptoms in Hospital Cleaning Staff Exposed to a Product Containing Hydrogen Peroxide, Peracetic Acid, and Acetic Acid

2018 ◽  
Vol 64 (8) ◽  
pp. 911-911
Author(s):  
Brie Hawley ◽  
Megan Casey ◽  
Mohammed Abbas Virji ◽  
Kristin J Cummings ◽  
Alyson Johnson ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Acetic Acid ◽  
Peracetic Acid ◽  
Respiratory Symptoms ◽  
Cleaning Staff ◽  
Hospital Cleaning

Simultaneous determination of peracetic acid and acetic acid by titration with NaOH

2014 ◽  
Vol 6 (7) ◽  
pp. 2406-2409 ◽  
Author(s):  
Frank Sode
Keyword(s):  
Hydrogen Peroxide ◽  
Acetic Acid ◽  
Simultaneous Determination ◽  
Peracetic Acid ◽  
Easy Method

This paper describes a fast and easy method to analyze peracetic acid in mixtures with both acetic acid and hydrogen peroxide.

scholarly journals The Kinetics of the Acid-Catalyzed Formation of Peracetic Acid from Acetic Acid and Hydrogen Peroxide

1965 ◽  
Vol 38 (12) ◽  
pp. 2103-2106 ◽  
Author(s):  
Yasuhiko Sawaki ◽  
Yoshiro Ogata
Keyword(s):  
Hydrogen Peroxide ◽  
Acetic Acid ◽  
Peracetic Acid ◽  
Acid Catalyzed ◽  
Kinetics Of
Sign in / Sign up

Export Citation Format

Share Document