Response Surface Investigation and Optimisation of an Etherification Reaction of a Compound Containing Several Hydroxylic Groups.

Bjørsvik, Hans‐René; Aukrust, Audun; Knutsen, Lars J. S.; Malik, K. M. Abdul; Olivo, Horacio F.; Roberts, Stanley M.; Varley, David R.; Xiong, Hui; Bisht, Kirpal S.

doi:10.3891/acta.chem.scand.49-0115

Cited by 2 publications

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“…The protonation/deprotonation equilibrium may initiate a decomposition reaction only if a suitable reaction partner is available. By treating iodixanol 5 with aqueous H 2 SO 4 (9 M ) at 145 °C under optimized conditions (20), 51% of ether 13 was formed among other unidentified products that could be removed by ion exchange treatment. Compound 13 is formed by ether linkage between two primary hydroxyl groups of iodixanol.…”

Section: Resultsmentioning

confidence: 99%

Stability of the X-ray contrast agent iodixanol=3,3',5,5'-tetrakis(2,3-dihydroxypropylcarbamoyl)-2,2',4,4',6,6'-hexaiodo-N,N'-(2-hydroxypropane-1,3-diyl)-diacetanilide towards acid, base, oxygen, heat and light

Priebe¹,

Aukrust²,

Bjørsvik

et al. 1999

J Clin Pharm Ther

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Section: Resultsmentioning

confidence: 99%

Stability of the X-ray contrast agent iodixanol=3,3',5,5'-tetrakis(2,3-dihydroxypropylcarbamoyl)-2,2',4,4',6,6'-hexaiodo-N,N'-(2-hydroxypropane-1,3-diyl)-diacetanilide towards acid, base, oxygen, heat and light

Priebe¹,

Aukrust²,

Bjørsvik

et al. 1999

J Clin Pharm Ther

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“…Besides, a significant positive absorption peak appears at the ether bands; this phenomenon is related to the etherification reaction between the hydroxyl groups bonded to exocyclic carbon atom of VC and the hydroxyl groups of coal. 36 As a result, a large number of stable ether bonds were generated, which is indicative of the role of VC in improving the thermal stability of coal.…”

Section: Resultsmentioning

confidence: 99%

Experimental Investigation on a Sustained Release Type of Inhibitor for Retarding the Spontaneous Combustion of Coal

Wang

et al. 2016

Energy Fuels

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A sustained release type of inhibitor (PS-C) prepared with poly(acrylic acid)/sodium alginate super absorbent (PS), ascorbic acid (VC), and water was developed, which exhibited a not only highly efficient but also sustained inhibition performance on the spontaneous combustion of coal. The impact of PS hydrogel on coal oxidation was examined thermodynamically by TGA−DSC tests, and the variations of functional groups on coal surface under the influence of VC were in situ monitored by an FT-IR technique. The inhibition performance was evaluated with a parameter defined as the emitted carbon monoxide concentration decay rate during coal oxidation. The results show that the PS hydrogel and VC perform distinctive inhibition characteristics by physically removing the accumulated heat and chemically interrupting the free radical chain reaction of coal oxidation, respectively. The composite PS-C is capable of combining the inhibition characteristics of PS hydrogel and VC as well as further realizing a dramatic synergism between PS hydrogel and VC, which is characterized by significant improvement of both the inhibitory efficiency and the temperature stability. Further observation of the SEM images reveals the synergism mechanism of PS-C as the caged-wrapping and sustained release of VC. With the optimum proportion of PS to VC identified as 1:3 and the optimum additive amount in coal found to be 8 wt %, PS-C exhibits an excellent applicability for inhibiting the spontaneous combustion of different ranks of coal efficiently and consistently.

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Response Surface Investigation and Optimisation of an Etherification Reaction of a Compound Containing Several Hydroxylic Groups.

Cited by 2 publications

References 0 publications

Stability of the X-ray contrast agent iodixanol=3,3',5,5'-tetrakis(2,3-dihydroxypropylcarbamoyl)-2,2',4,4',6,6'-hexaiodo-N,N'-(2-hydroxypropane-1,3-diyl)-diacetanilide towards acid, base, oxygen, heat and light

Stability of the X-ray contrast agent iodixanol=3,3',5,5'-tetrakis(2,3-dihydroxypropylcarbamoyl)-2,2',4,4',6,6'-hexaiodo-N,N'-(2-hydroxypropane-1,3-diyl)-diacetanilide towards acid, base, oxygen, heat and light

Experimental Investigation on a Sustained Release Type of Inhibitor for Retarding the Spontaneous Combustion of Coal

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