Abstract: A catalyst and process for purifying crude terephthalic acid wherein the catalyst is prepared by contacting a carbonaceous support with an aqueous solution of sodium tetranitropalladate.

Abstract: A process for producing a purified terephthalic acid which comprises reacting in a liquid phase a mixture of hydrogen and crude terephthalic acid, a palladium/rhodium catalyst on a porous carbonaceous support wherein the catalyst compound is prepared by adsorbing palladium on the support from a complex salt formed in the presence of an amine and acetic acid, followed by deposition of rhodium from a solution of sodium hexanitritorhodate.

Abstract: A catalyst and process for purifying crude terephthalic acid wherein the catalyst is prepared by contacting a carbonaceous support with an aqueous solution of sodium tetranitropalladate.

Abstract: A catalyst and process for purifying crude terephthalic acid wherein the catalyst comprises palladium metal crystallites deposited upon a carbon support wherein the catalyst is prepared by contacting a carbonaceous support with an aqueous solution of a palladium amine complex in the presence of acetic acid.

Abstract: A process for producing a purified terephthalic acid which comprises reacting in a liquid phase a mixture of hydrogen and crude terephthalic acid, a palladium/rhodium catalyst on a porous carbonaceous support wherein the catalyst compound is prepared by adsorbing palladium on the support from a complex salt formed in the presence of an amine and acetic acid, followed by deposition of rhodium from a solution of sodium hexanitritorhodate.

Abstract: Aqueous solution of weak base (e.g. ammonium hydroxide) incompletely neutralized salt of an inorganic polyacid having three or more replaceable hydrogens also containing 2 to 10 weight percent dissolved alkanol or alkanenitrile buffered to a pH not exceeding 7.5 is a useful mobile phase for liquid chromatographic component separation and content determination of sample containing closely related rather polar compounds by means of a solid phase having a nitrogen-containing exchange base derived from an aminoalkyl-substituted trialkoxysilane. Such mobile phase is superior to prior suggested reverse phase made mobile phases such as 50:50 water and methanol or water and acetonitrile, or acidic aqueous solutions of strong base (e.g. sodium hydroxide) partially neutralized inorganic polyacid having at least three replaceable hydrogens.

Abstract: A process is disclosed for producing a structural foam article having a surface that reproducibly and faithfully replicates the surface of the mold within which the article was made. The process is an improvement in the "low pressure" process for producing structural foam, wherein the improvement resides in introducing the molten mixture of foamable thermoplastic material and blowing agent into the mold under such conditions that a no-slip boundary condition is maintained at an interface between the flowing thermoplastic and a predetermined portion of the interior surface of the mold, and by maintaining the temperature at said interface at or above a certain temperature (termed "replication temperature"), while the thermoplastic is flowing in the mold.