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THERMOSETTING RESINS MADE FROM CONIFEROUS BARK are said "bo be good substitutes fox*, or additives to, phenol aldehyde resins· The bark is treated with sodium hydroxide, then reacted witti formaldehyde to form the resin· A paraformaldehyde solution in water or formalin, with varying amounts of alkali, is stirred in to form a smooth paste suitable for plywood adhesive· It is reported that pre-extraction of the barvk with benzene produces a superior resin, as does the addition of 20^ by weight of a phenol or* 3,5xylenol. UREA AND THIOUREA SEPARATE CEÎtTAIN ORGANIC COMPOUNDS, Urea forms preferential adducts -with organic compounds having straight chains of 6-50 carbon atoms; thiourea forms adducts with branched and cyclic compounds having 3-50 carbon atoms. Low-boiling aliphatic alcohols are used as solvents. Adducts form at any temperature from 0-100 p.; 80 F. is preferable. A PATENTED PROCESS FOR PURIFYING MOLASSES employs methanol and an acid to separate out unâe sir able cations. One part by weight of molasses is mixed with up to two parts by weight of methanol· An acid is added which forms salts with the cations present; these salts are insoluble in the molasses-methanol mixture» Enough acid is added to give a pH of 1-5 at 20 to 8θ Ο· Liquid and solid phases are then separated and. a pure sugar is crystallized from the liquid, phase. PRACTICALLY PURE ACETYLENE is obtained from crude acetylene streams by a recently developed system· A recoverable ammonia solution removes carbon di oxide; passage through a heat exchanger removes aromatic hydrocarbons and water· The acetylene and its homoloçs are then dissolved in liquid ammonia, and the solution is fractionated. Practically pure acetylene is produced in the head fraction.
Allied Chemical 40 Rector Street, New York 6, Ν. Υ.
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Information appearing here is published as a service to readers. Although we do not make the end products mentioned, we can supply you with these basic chemicals:
ethanolamines · ethylene oxide · ethylene glycols · urea U.F. CoRcentrate-85 • anhydrous ammonia · ammonia liquor · sodium nitrate · methanol · nitrogen solutions · fertilizers a n d feed supplements.
· formaldehyde ammonium sulfate nitrogen tetroxide
