Reference

Coking of aromatics over an HDS catalyst

Coking of aromatics over an HDS catalyst. Scaroni, A. W.; Jenkins, R. G. (Dep. Mater. Sci. Eng., Pennsylvania State Univ., University Park, PA 16802, USA). Prepr. - Am. Chem. Soc., Div. Pet. Chem., 30(3), 544-8 (English) 1985. CODEN: ACPCAT. ISSN: 0569-3799. DOCUMENT TYPE: Journal CA Section: 51 (Fossil Fuels, Derivatives, and Related Products) With respect to upgrading of heavy petroleums and coal liqs., the decreasing order of coking propensity in the presence of a Co-Mo hydrodesulfurization catalyst was anthracene [120-12-7] > acridine [260-94-6] > anthraquinone [84-65-1] > 9,10-dihydroanthracene [613-31-0] > phenanthrene [85-01-8]. Acridine coked to a lesser extent than anthracene without the catalyst. It appears that N-contg. heterocyclics act as coking precursors not because of high inherent coking propensities but because of preferential adsorption and prolonged attachment to acid sites on the catalyst surface.

Alkali treatment of xylotriose and birch xylan in the presence of anthraquinone

Alkali treatment of xylotriose and birch xylan in the presence of anthraquinone. Niemela, Klaus; Sjostrom, Eero (Lab.Several substances are used for example 84-65-1 which is its cas registry number. Wood Chem., Helsinki Univ. Technol., Espoo SF-02150, Finland). Acta Chem. Scand., Ser. B, B39(5), 407-9 (English) 1985. CODEN: ACBOCV. ISSN: 0302-4369. DOCUMENT TYPE: Journal CA Section: 43 (Cellulose, Lignin, Paper, and Other Wood Products) Section cross-reference(s): 33 The effects of anthraquinone (I) [84-65-1] on carbohydrate reactions during alk. pulping of hardwood were studied using xylotriose (II) [47592-59-6] and birch xylan (III) [9014-63-5] as model compds. The degrdn. of II gave rise to 16 hydroxymonocarboxylic acids. Addn. of I to the cooking lidecreased the proportion of 2-hydroxybutanoic acid (IV) [565-70-8], lactic acid [50-21-5], and xyloisosaccharinic acid (V) [80620-03-7], but markedly accelerated the formation of 3-deoxytetronic acid (VI) [1518-62-3]. Addn. of I during heating of birch III with NaOH decreased the formation of IV and V, but increased the amt. of glycolic acid [79-14-1] and VI. Rhamnose moieties present in birch III gave rise to 3,6-dideoxy-ribo-hexonic acid [41485-14-7] and 3,6-dideoxy-arabino-hexonic acid [39664-11-4]. .