Allophanates.

Abstract

concerning this article should be addressed to Ernest I. Becker at the Poly technic Institute of Brooklyn.4 Allophane: Greek allophanes, "appearing otherwise," from alios (otherwise) + phainesthai (to appear). 5 The term has also been used to describe a class of inorganic aluminum silicates. These are not under consideration here. Although «-and 7-substituted allophanates are also known, the discussion has been limited to esters of the unsubstituted acid:

O-Carbamates

“…Although earlier investigators [24,29,30] reported that cyanic acid reacts with alcohols to give allophonates, Loev [28] never detected any of these in his procedure. The only by-product was trifluoroacetamide, which did not present a difficulty because of its high solubility in water and organic solvents.…”

Selective Absorption of Hydrogen Sulfide From Synthesis Gas

“…At the time the purification pilot plant was put into operation, most of the sulfur-recovery systems in this country were based on the Claus process and were designed to operate with feed gas containing large amounts of hydrogen sulfide, generally more than 30% (2,21). The concentration of hydrogen sulfide in the feed gas has a maiked effect on the economy of these sulfur-recovery plants (1,4,6,11)• When the raw gas produced contains a high carbon dioxidehvdrogen sulfide ratio, selective absorption processes are of importance so that the acid gas (carbon dioxide and hydrogen sulfide) recovered from the reactivator of the gas-purification plant will have the highest possible hydrogen sulfide content. Owing to this need for selectivity, pilot plant data had to be obtained on the selective properties of such absorbents as triethanolamine, tripotassium phosphate, and potassium V-dimethyl glycine.…”

Synthesis and thermal properties of bismaleate and bisfumarate telechelic oligomers from hydroxytelechelic polybutadienes

“…Polyurethane resins from either polyethers or from hydroxy telechelic polybutadiene are relevant and widely used because of the versatility of their performance. However, their poor thermal stability (mainly due to urethane links5) and toxicity from diisocyanates6 have directed researchers to use other crosslinking agents and chain extenders.…”