Abstract: Cynnamic aldehyde disolved in an aromatic hydrocarbon is oxidized in the liquid phase with molecular oxygen at a temperature in the range of 30.degree.-80.degree. C. in the presence of a cobalt compound and water.

Abstract: In a process for the production of an aminophenol which comprises reacting a divalent phenol and ammonia in the absence of a catalyst or in the presence of a water-soluble catalyst, then separating the reaction mixture after the reaction to recover a separated and recovered product containing an aminophenol and the unreacted divalent phenol, and separating and purifying the aminophenol from said separated and recovered product, the process for the production of an aminophenol which is characterized by, on separating and purifying said aminophenol, contacting said separated and recovered product with an aliphatic ether substantially incompatible with said aminophenol in an inert gas atmosphere at a temperature at which said separated and recovered product melts or higher, then cooling to induce the crystallization of the aminophenol, thereafter filtering and recovering to obtain a cake mainly composed of said aminophenol, further melting and contacting this cake with an aliphatic ether in an inert gas atmosphe

Abstract: A method for producing an aromatic carbonyl compound represented by the formula (B)-1 or (B)-2: ##STR1## comprising decomposing a hydroperoxide represented by the formula (A)-1 or (A)-2: ##STR2## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are defined in the specification, in an inert gas atmosphere in the presence of an aqueous layer containing an iron salt, a copper salt and an acid is disclosed. Novel m-(2-hydroxy-2-propyl)acetophenone and m-isopropenylacetophenone which are useful as an intermediate for the preparation of medicines are also disclosed. A method for producing m-isopropenylacetophenone comprising dehydrating m-(2-hydroxy-2-propyl)acetophenone in the presence of an acid catalyst is further disclosed.

Abstract: A fuel injection apparatus of the type which uses a servomechanism utilizing a fluid to control the fluid-communication ratio of a fuel measuring gate disposed in a fuel supply passage. The device is so designed that signals which detect the operating condition of the engine control the amount of fuel to correct the air-fuel ratio so as to provide an ideal air-fuel ratio and that the set value for the servomechanism is controlled so that the output time ratio of fuel lean and rich signals included in the above-mentioned signals may be maintained at a predetermined value, thereby shortening the time required for correcting the air-fuel ratio.

Abstract: Dihydric phenol is effectively prevented from discoloration by mixing the dihydric phenol with 0.00001 to 0.1% by weight of hydrocarboxylic acid on the basis of the dihydric phenol.

Abstract: A fuel feeding apparatus for internal combustion engines comprises an area type air flow rate measuring section in which the air flow rate is dependent on the displacement of an air flow rate detecting valve, and a fuel flow rate measuring and distributing section in which a variable orifice defined by a rotor and a stator determines the fuel flow rate proportional to the air flow rate. This apparatus is characterized by the provision of an exhaust gas sensor disposed in the exhaust pipe for the detection of the oxygen concentration of the exhaust gas in order to achieve the complete combustion of fuel in the internal combustion engine, the output signal from the exhaust gas sensor being used to compensate the fuel feeding pressure and a spring force which acts on the pressure difference setting diaphragm of a servo-mechanism.

Abstract: A fluid plaster composition comprising gypsum hemihydrate of .alpha.-form and a surface active agent of phosphoric ester, which is useful for formation of a horizontal surface by application onto a floor surface.