Abstract:
Discoloration of maleic anhydride is minimized by first passing the maleic anhydride in molten or dissolved form through a bed of cation exchange resin and then adding to the maleic anhydride a small amount of 3,3'-thiodipropionitrile.
Abstract:
Method of preparing para-cumylphenol including reacting an excess of phenol with alpha-methylstyrene by the slow addition of alpha-methylstyrene to a 50% to 200% molar excess of phenol at a temperature from about 80.degree. C. to about 90.degree. C. in the presence of an acid catalyst and thereafter maintaining the temperature at about 95.degree. to about 100.degree. C. to obtain a crude cumylphenol reaction product containing acid derived from the catalyst, and distilling the reaction product in the presence of an amount of base sufficient to neutralize the acid therein.
Abstract:
Weakly basic ion exchange resins are used to remove iron compounds in anhydrous or substantially anhydrous organic systems such as phenolic process streams. The resins may be either in the form of a weak salt such as the amine hydrochloride or may be a protonated amine carboxylic acid in the acidic form. In either case, we have determined that the active site does not perform in a conventional ion exchange manner but rather forms a complex with the entire iron compound molecule. While the complex is formed in a waterless or almost waterless system, it may be regenerated in an aqueous system.
Abstract:
An antifoulant coating composition and preparation method in which the final composition is composed of two Components A and B mixed immediately before the composition is applied, and usually an inert filler introduced at least in part via Component A. The active ingredient of Component A is a base formed of coal-tar pitch or equivalent and epoxy resin. The active ingredients of Component B are a curing agent for the epoxy resin and a solid organotin toxicant. Component B may be either a slurry of needle-like crystals of toxicant, or the toxicant may be dissolved in a suitable solvent. In the latter case the toxicant precipitates as needle-like crystals when Components A and B are mixed. The invention produces a composition of a viscosity which makes it easy to apply.