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The Chemical Technology of Wool Finishing
Published in Menachem Lewin, Stephen B. Sello, Handbook of Fiber Science and Technology: Chemical Processing of Fibers and Fabrics, 2018
Trevor Shaw, Max A. White, L. Benisek, M. A. Rushforth, J. R. Christoe, I. M. Russell
Sulfur-Containing Flame-Retardants: Sulfated wool, formed by the action of sulfuric acid on wool, produces a flame-resistant fiber but with limited wash-fastness [308]. However, sulfation with 20% sulfamic acid in the presence of 20% urea imparted flame-retardance to a wool knit fabric [285]. Provided that 4% sulfur was present, the treatment was fast to 50 launderings at 60°C.
Rehabilitation Methods: Technical Descriptions
Published in Stuart A. Smith, MONITORING and REMEDIATION WELLS, 2017
Sulfamic acid is a dry granular material that produces a strong acid when mixed with water. Sulfamic acid should not be confused with sulfuric acid (a yellow liquid), which should never be used in well cleaning, due to the formation of insoluble products.
Producing Fuels and Fine Chemicals from Biomass using Nanomagnetic Materials
Published in Vanesa Calvino-Casilda, Antonio José López-Peinado, Rosa María Martín-Aranda, Elena Pérez-Mayoral, Nanocatalysis, 2019
Wang et al. (2015) reported the synthesis of acids catalyst for biodiesel production in the form of sulfamic acid and sulfonic acid functionalized silica coated crystalline Fe/Fe3O4 core/shell magnetic nanoparticles (MNPs). These MNPs have been demonstrated to be efficient recoverable catalysts for the biodiesel production from oils and fats containing a high level of free fatty acids, like waste cooking oil. The synthesis of the catalysts consisted of three steps. First, magnetic crystalline high magnetic nanoparticles were prepared by thermal decomposition of iron pentacarbonyl, in the second step, the particles were covered by silica by hydrolyzing tetraethoxysilane (TEOS) on the surface of MNPs under basic conditions and in the last step, the particles were functionalized by silanation with (3-aminopropyl) triethoxysilane (APTES) and (3-mercaptopropyl) trimethoxysilane (MPTMS), producing NH2-SiO2-functionalized-MNPs. The treatment with sulfuric acid or chlorosulforic acid created two different types of acid MNPs, sulfonic acid functionalized MNPs and sulfamic acid functionalized MNPs. The catalysts were tested in the transesterification of glyceryl trioleate and in the esterification of oleic acid in methanol. The catalysts were tested varying the temperature from 60 to 100°C and showed better performances at a higher temperature. In 20 hours of transesterification reaction at 100°C, sulfonic acid functionalized MNPs and sulfuric acid functionalized MNPs reached respectively 88% and 100% of conversion. The esterification of oleic acid was concluded within four hours with 100% of conversion for both the catalysts at 70°C in methanol.
Synthesis and properties of sodium isotridecyl polyoxyethylene ether sulfate with different ethylene oxide addition numbers
Published in Journal of Dispersion Science and Technology, 2022
Penghui Li, Shengti Cao, Yueqing Huo, Xiaochen Liu
In industrial production, concentrated sulfuric acid, chlorosulfonic acid, sulfur trioxide, sulfamic acid, sulfite, and so on, are mainly used as sulfating reagents. For the synthesis of isomeric sodium alcohol ether sulfate, most of them are synthesized by using chlorosulfonic acid or sulfamic acid as the sulfating reagent, which has certain pollution to the environment. Using SO3 as the sulfating agent can avoid the above problems, and the reaction can be completed instantly and violently, no water and waste acid are generated, the reaction product has high purity, and the follow-up treatment is simple. After sulfonation, the product can be directly obtained by neutralization, which is a typical atomic economy reaction.[14]
Complex study of acid-in-oil emulsions, their formation, stabilization and breakdown
Published in Journal of Dispersion Science and Technology, 2023
Mikhail A. Silin, Lyubov A. Magadova, Lyutsia F. Davletshina, Timur I. Yunusov, Konstantin K. Merzlyakov, Viktoria D. Kotekhova
Hydrochloric and sulfamic acid solutions were used as the water phase. The acid concentrations were 5, 10, and 15 wt.%. Hydrochloric acid (HCl) is the most popular choice for acid treatment. It is inexpensive and possesses high strength (pKa = −7), but its storage and transportation may be problematic. Weak sulfamic acid (NH2SO3H, pKa = 1) is a dry alternative to HCl and has become more popular for use in Russian oilfields, with reservoir temperatures up to 60 °C. Thus, the acid was used in current experiments. The acid solution densities are listed in Table 2.
Smartphone-based colorimetric determination of sulfadiazine and sulfasalazine in pharmaceutical and veterinary formulations
Published in Instrumentation Science & Technology, 2018
Sophia Ait Errayess, Laila Idrissi, Aziz Amine
0.2% (w/v) of sulfamic acid (prepared in 100 mL of distilled water) and potassium dichromate (99.0%) were purchased from Solvachim (Morocco). 1% (w/v) of sodium nitrite (prepared in 100 mL of distilled water), 20% (w/v) of sodium hydroxide (prepared in 100 mL of distilled water), 1 M of hydrochloric acid and dimethyl sulfoxide (≥99.0%) were purchased from LOBA Chemie (India). Methanol (≥99.9%), HPLC grade, was purchased from ProLab (Canada).