121-47-1Relevant articles and documents
The Photochemistry of Phenylsulphamic Acid: Photorearrangement and Photodegradation
Lally, John M.,Spillane, William J.
, p. 8 - 9 (1987)
Photolysis of the sodium salt of phenylsulphamic acid (1,Na) yields the isomeric aniline sulphonic acids (2)-(4) and aniline (5); the involvement of an intramolecular radical rearrangement and two triplet states in the photoreaction are supported.
Acid-resistant catalysis without use of noble metals: Carbon nitride with underlying nickel
Fu, Teng,Wang, Meng,Cai, Weimeng,Cui, Yuming,Gao, Fei,Peng, Luming,Chen, Wei,Ding, Weiping
, p. 2536 - 2543 (2014)
A nanocomposite able to function as a hydrogenation catalyst under strongly acidic conditions without the presence of noble metals is synthesized and thoroughly studied. This specially designed catalyst possesses a unique structure composed of carbon nitride (CN) with underlying nickel, in which the nickel endows the CN with new active sites for hydrogen adsorption and activation while it itself is physically isolated from the reactive environment and protected from poisoning or loss. The CN is inert for hydrogenation without the help of nickel. The catalyst shows good performance for hydrogenation of nitro compounds under strong acidic conditions, including the one-step hydrogenation of nitrobenzene in 1.5 M H2SO4 to produce p-amoniophenol, for which the acid in the reaction system has restricted the catalyst only to noble metals in previous studies. Further characterization has demonstrated that the nickel in the catalyst is in an electron-deficient state because some of its electron has been donated to CN (HRTEM, PES); thus, the hydrogen can be directly adsorbed and activated by the CN (HD exchange, in situ IR and NMR). With this structure, the active nickel is protected by inert CN from the corrosion of acid, and the inert CN is activated by the nickel for catalytic hydrogenation. The assembly of them gives a new catalyst that is effective and stable for hydrogenation even under a strongly acidic environment.
Synthetic method for organic synthesis intermediate metanilic acid
-
Paragraph 0011; 0013; 0014; 015, (2018/09/08)
The invention relates to a synthetic method for organic synthesis intermediate metanilic acid. The method mainly comprises the following steps: adding 2 mol of 3-methylaniline, 3-4 mol of a sulfuric acid solution and 10-13 g of aluminum oxide powder into a reaction vessel, raising the solution temperature to 40-45 DEG C, controlling a stirring speed to be 90-110 rpm, performing stirring for 90-110min, raising the solution temperature to 70-80 DEG C, performing reflux for 30-40 min, performing washing by using a potassium bromide solution, performing washing by using a cyclohexane solution, performing washing by using a butanone solution, performing dehydration by using a dehydrating agent, and performing recrystallization in an isopropanol solution to obtain the crystal metanilic acid.
Cu-α-NiMoO4 photocatalyst for degradation of Methylene blue with pathways and antibacterial performance
Ray, Schindra Kumar,Dhakal, Dipesh,Kshetri, Yuwaraj K.,Lee, Soo Wohn
, p. 18 - 32 (2017/08/22)
Cu doped α-NiMoO4 photocatalyst has been synthesized by microwave hydrothermal method. The existence of Cu2+ ions at lattice position of α-NiMoO4 was observed on the basis of XRD, HRTEM, SAED, and EDS analysis. The negative zeta potential values indicate the stability of samples. Solar light driven photocatalytic degradation of Methylene blue (MB) dye in water was used to evaluate the photocatalytic performance of Cu doped α-NiMoO4 photocatalyst. The results revealed that there is an optimum Cu (4 mol%) doping level leads to highly enhanced photocatalytic activity of Cu-α-NiMoO4, as compared to α-NiMoO4 host. The experiment also suggested that active species (OH[rad], O2[rad]? and h+) play a crucial role in the scavenging system. The reduced energy band gap, oxygen vacancy, high BET surface area, and efficient separation of photogenerated electron/hole are responsible for enhancement of photocatalytic performance. MB photodegradation intermediates were identified by high resolution-quadruple time of flight electrospray ionization mass spectrometry (HR-QTOF ESI/MS) in positive ion mode and degradation pathway was proposed. Antibacterial performance was analyzed against Gram-positive (methicillin resistant Staphylococcus aureus and Bacillus Subtilis) and Gram-negative bacteria (Pseudomonas aeruginosa) via well-diffusion method. The formation of larger inhibition zone by small quantity of photocatalyst powder proved the excellent antibacterial performance. The inactivation of microorganism were found in following order: B.Subtilis ? S.aureus ? P.aeruginosa. The result of our study suggested that copper doped α-NiMoO4 photocatalyst is suitable for degradation of organic contaminates as well as effective for growth inhibition of multidrug-resistant microorganisms.
A catalytic hydrogenation process for preparation of metanilic acid
-
Paragraph 0021; 0022, (2017/02/09)
Belonging to the field of fine chemical industry, the invention in particular relates to a method for preparation of m-aminobenzenesulfonic acid by catalytic hydrogenation. The method includes: taking sodium m-nitrobenzene sulfonate as the raw material, adding water for dissolving, boiling the mixture by activated carbon, conducting hot filtration, adjusting the pH value of the filtrate to 7.5-8.5 by a sodium hydroxide aqueous solution, employing Pt-Ru/C as a catalyst to perform hydrogenation reduction for preparation of m-aminobenzenesulfonic acid, ending the hydrogenation reduction reaction when the hydrogen pressure no longer changes, filtering out the Pt-Ru/C catalyst at the end of the reaction, firstly washing the catalyst by ethanol, then carrying out washing recycling, with the recycled catalyst being able to be applied over 50 times and still having a conversion rate and selectivity up to 99%; and subjecting the obtained filtrate to acid precipitation to pH of 2, thus obtaining a white crystal, i.e. the target product m-aminobenzenesulfonic acid. The method provided by the invention lowers the catalyst cost, improves the utilization rate of equipment, and also overcomes the problems of pollution and energy consumption in the regeneration process of the catalyst.
Asymmetric dioxazine compounds and method for dyeing or printing fiber materials using the same
-
, (2008/06/13)
An asymmetric dioxazine compound represented by the following formula (I) in the free acid form: STR1 wherein A1 and A2 independently of one another are each sulfo, halo, alkyl or alkoxy, X1 and X2 independently of one another are each hydrogen, halo, alkyl, alkoxy or phenoxy, R1 is hydrogen or unsubstituted or substituted alkyl, R2 and R3 independently of one another are each hydrogen, alkyl, alkoxy, halo or unsubstituted or substituted amino, Z is a fiber-reactive group, m and n independently of one another are each 0 or 1, provided that mn, and L is 1 or 2. This compound is suitable for dyeing and printing cellulose fiber, natural and synthetic polyamide fibers, polyurethane fiber, leather and the like and mixed yarns thereof, to obtain dyed or printed products of a color fast to light, wetness and chlorine with superior build-up and level dyeing properties.
Asymmetric dioxazine compounds and method for dyeing or printing fiber materials using the same
-
, (2008/06/13)
An asymmetric dioxazine compound represented by the following formula (I) in the free acid form: STR1 wherein A1 and A2 independently of one another are each sulfo, halo, alkyl or alkoxy, W is an unsubstituted or substituted aliphatic or aromatic bridging group, X1 and X2 independently of one another are each hydrogen, halo, alkyl, alkoxy or phenoxy, R1 and R2 independently of one another are each hydrogen or unsubstituted or substituted alkyl, R3 and R4 independently of one another are each hydrogen, halo, alkyl, alkoxy or unsubstituted or substituted amino, Z is a fiber-reactive group, m and n independently of one another are each 0 or 1, provided that m≠n, and l is 1 or 2. This compound is suitable for dyeing and printing cellulose fiber, natural and synthetic polyamide fibers, polyrethane fiber, leather and the like and mixed yarns thereof, to obtain dyed or printed products of a color fast to light, wetness and chlorine with superior build-up and level dyeing properties.
Process for the preparation of aminoarylsulphonic acids
-
, (2008/06/13)
In the process according to the invention for the preparation of aminoarylsulphonic acids by catalytic hydrogenation of nitroarylsulphonic acids, a substantial increase in the space-time yield in combination with reduced consumption of the catalyst is achieved by dispersing the hydrogen more finely and by limiting according to the invention the concentration of the nitroarylsulphonic acids to be hydrogenated.
The Photochemistry of para-Substituted Phenylsulphamates - Photo-Fries Rearrangements
Lally, John M.,Spillane, William J.
, p. 803 - 807 (2007/10/02)
The photolysis (254 nm) of a series of para-substituted phenylsulphamates, XC6H4NHSO3Na in degassed methanolic solutions has been examined.For 1a and 1b photo-Fries type rearrangements to sulphonic acids and photodegradation to anilines have been observed.The halogenosulphamates 1c-1e do not rearrange but degrade to anilines and are photosolvolysed to p-methoxyphenylsulphamic acid.No notable spectral changes took place during the irradiation of 1f over relatively long period.Substrate concentration studies, radical scavenging and sensitization and quenching experiments on 1b indicate that, as previously found for 1a, its photolysis involves an intramolecular radical mechanism with the participation of two triplet states.
ISOMERIC TRANSFORMATIONS OF AMINOSULFONIC ACIDS OF THE BENZENE SERIES IN MIXTURES OF SULFURIC AND ACETIC ACIDS
Khelevin, R. N.
, p. 132 - 137 (2007/10/02)
The isomerization rate of aminosulfonic acids in anhydrous binary mixtures of sulfuric and acetic acids is lower than in aqueous sulfuric acid solutions but higher than in 100percent sulfuric acid.This is explained by the differences in the structure and activity of the proton carriers during desulfonation.The rate of transformation of the labile isomers into the meta isomers increases with increase in the acidity of the medium, and this is due to the increase in the resulfonation rate of the protonating molecules of the amines formed during the desulfonation of the aminosulfonic acids.The effect of mercuric sulfate on the isomeric transformations of aminosulfonic acids is explained by the mercuration of the protonated molecules of the amines, which takes place at higher rates than their sulfonation and leads to the formation of the meta-mercury derivatives of the amines.The latter are than converted into the m-aminosulfonic acids by the action of concentrated sulfuric acid.
