Abstract: The invention is an improved method of purification of isophthalic acid comprising recycling a portion of the mother liquor solution into the feed solution of an isophthalic acid purification process. The improved method comprises the following steps:(a) dissolving crude isophthalic acid in a feed solution comprising a polar solvent at a temperature of from about 100.degree. C. to about 300.degree. C.;(b) crystallizing the isophthalic acid by cooling the solution of step (a) to a temperature of from about 35.degree. C. to about 120.degree. C.;(c) separating the isophthalic acid crystals from the solution and drying the crystals; and(d) recycling a portion of the solution remaining after the separation of isophthalic acid crystals back to the feed solution.

Abstract: Novel maleic anhydride catalysts comprising phosphorus-vanadium oxides and phosphorus-vanadium-co-metal oxides and the process for making such catalysts are disclosed. These catalysts under reaction conditions for the manufacture of maleic anhydride from butane feedstock do not expand to the point of crushing and producing fines. Moreover, the halogen level of such a catalyst is reduced.

Abstract: A polypropylene composition which demonstrates good color stability and water carry-over properties comprises polypropylene containing a hindered amine light stabilizer and about 0.01 to about 0.5 wt. % of a fluoborate salt. Ammonium fluoborate, sodium fluoborate and potassium fluoborate are particularly useful.

Abstract: The present invention relates to an apparatus for illuminating and for collecting air which is contaminated by a certain substance in the adjacent area of the apparatus. The latter includes a reflector defining an internal cavity in which is mounted a light source. A conduit is mounted to the reflector and communicates with the internal cavity thereof. A blower unit is mounted within the reflector and is controlled by a switch responsive to the contaminant present in the air wherein when the concentration of contaminant exceeds a predetermined level, the switch activates the blower unit which draws contaminated air and expels it through the conduit.

Abstract: The present invention relates to a shaped, molded refractory and insulating product derived from the chemical bonding of muscovite, phlogopite or mixtures thereof with an acid aluminum phosphate having a ratio of Al:P of from 0.286 to 0.666 to which may be added an inert filler, a monofilament or oriented monofibers or woven fibers and which may have a metal cladding adhering to at least one surface of the shaped product.

Abstract: The present invention relates to a process for oxidizing bilirubin which comprises reacting a solution containing bilirubin with hemoglobin, either in free or immobilized form, in the presence of an oxidizing agent such as hydrogen peroxide. This process if useful in reducing bilirubin levels in the blood of severely jaundiced patients. It also provides a basis for determining bilirubin levels in a fluid.