Abstract: In the process of producing polyisocyanates by(a) condensing an alkyl-N-phenylcarbamate having 1 to 3 carbons in the alkyl moiety in the presence of an acid to produce condensate containing diphenylmethane dicarbamates and polymethylene polyphenyl carbamates with by-product N-benzyl compounds, rearranging said N-benzyl compounds in said condensate with acid catalyst to obtain a pyrolysis feed mixture containing diphenylmethane dicarbamates, polymethylene polyphenyl carbamates and 0.02 to 1.0 percent by weight of amine impurities as NH.sub.

Abstract: Separating carbon monoxide from mixed gases containing the same with an adsorbent which is the product of heating a mixture of ferrous acetate and polyacrylonitrile in a ratio of ferrous acetate to polyacrylonitrile of 0.5:1.0 to 2.0:1.0 at a temperature of about 200.degree.-400.degree. C. in an oxygen-containing atmosphere for from about 2 to 10 hours.

Abstract: A process for producing zeolite A of the formulaNa.sub.x (AlO.sub.2).sub.x (SiO.sub.2).sub.y.ZH.sub.2 Owherein x=10 to 14, y/x=0.8 to 1.2 and Z=1 to 30, which comprises heating at a temperature of 60.degree. to 150.degree. C. an aqueous slurry comprising (a) at least one gram of clinoptilolite of the formulaNa.sub.x (AlO.sub.2).sub.x (SiO.sub.2).sub.y. ZH.sub.2 Owherein x=5 to 7, y/x=4.5 to 5.5 and Z=1 to 30, per 100 cc of slurry, (b) at least a stoichiometric amount of sodium aluminate, and (c) at least 1% by weight of sodium hydroxide until zeolite A forms and recovering zeolite A. Sodalite which may have the formulaNa.sub.6 (AlO.sub.2).sub.6 (SiO.sub.2).sub.6.2NaClcan be produced by carrying out the aforesaid process in the presence of sodium chloride.

Abstract: A process for the recovery of methacrylic acid formed from an aqueous sodium methacrylate solution derived from the silver catalyzed oxidation reaction of methacrolein and an aqueous solution of sodium hydroxide which comprises contacting the aqueous sodium methacrylate solution at a suitable temperature, in the presence of a high gaseous carbon dioxide pressure, with a water immiscible alkane, cycloalkane, alkyl benzene, or carboxylic acid ester solvent to extract and form a methacrylic acid-containing organic solvent phase, an aqueous phase and a precipitated sodium bicarbonate solid phase and recovering the methacrylic acid from the organic solvent phase. Liquid CO.sub.2 which may be employed with the water immiscible solvent at 800 psig may also be employed alone at its equilibrium vapor pressure as the reactant and extractant medium.

Abstract: In an aqueous alkaline solution having a pH greater than 11.9, thallous isobutyrate is oxidized by air at a temperature within a range from about 90.degree. to about 250.degree. C. to prepare a slurry of thallic oxide from which thallic oxide can be recovered. The alkaline isobutyrate solution can be treated with carbon dioxide under pressure to form a carbonate salt and isobutyric acid, which can be solvent extracted from the aqueous system using any hydrophobic solvent as extractant. Such isobutyric acid can be employed in a 30 percent aqueous solution at 90.degree.-150.degree. C. to dissolve thallic oxide and to prepare thallic triisobutyrate. This aqueous solution of thallic triisobutyrate can be employed for the oxidation of an organic compound susceptible to oxidation to desirable partially oxidized organic compounds. Gaseous propylene can be bubbled through a liquid reaction mixture containing water, an organic solvent miscible with water, and thallic trialkanoate to prepare gaseous propylene oxide.

Abstract: A process for the preparation of acrylic acid or methacrylic acid which comprises catalytically decomposing or converting in the presence of tellurium the peroxide (peroxy) compounds contained in the oxidate solution derived from the autoxidation of acrolein or methacrolein, particularly, the conversion of permethacrylic acid and methacrolein monopermethacrylate to methacrylic acid.

Abstract: A process for the liquid phase oxidation of .alpha.,.beta.-unsaturated aliphatic aldehydes, such as methacrolein and the in situ decomposition or conversion of unsaturated peroxy (peroxide) compounds formed during the oxidation to the corresponding .alpha.,.beta.-unsaturated aliphatic carboxylic acids which comprises passing oxygen or an oxygen-containing gas such as air through an inert solvent solution of the unsaturated aldehyde at a suitable temperature and pressure in the presence of an organic or inorganic zinc salt catalyst.

Abstract: In an aqueous alkaline solution having a pH greater than 11.9, thallous isobutyrate is oxidized by air in a temperature within a range from about 90.degree. C to about 250.degree. C to prepare a slurry of thallic oxide from which thallic oxide can be recovered. The alkaline isobutyrate solution can be treated with carbon dioxide under pressure to form a carbonate salt and isobutyric acid, which can be solvent extracted from the aqueous system. Such isobutyric acid can be employed in a 30 percent aqueous solution at 90.degree.-150.degree. C to dissolve thallic oxide and to prepare thallic triisobutyrate. This aqueous solution of thallic triisobutyrate can be employed for the oxidation of an organic compound susceptible to oxidation to desirable partially oxidized organic compounds, such as the oxidation of propylene to propylene oxide. The carbonate salt can be thermally decomposed to regenerate an alkaline metal hydroxide and carbon dioxide.