Abstract: A process for producing p-hydroxybenzaldehyde through p-aminobenzaldehyde from p-nitrotoluene, comprising reacting p-nitrotoluene with sodium polysulphide in an alcohol-alkali aqueous solution mixed solvent in the presence or absence of an aprotic polar compound to produce p-aminobenzaldehyde, diazotizing the p-aminobenzaldehyde and then hydrolyzing the diazotized p-aminobenzaldehyde to produce p-hydroxybenzaldehyde.

Abstract: Chlorination of xylenols with a chlorinating agent such as sulfuryl chloride in the presence of a metal chloride catalyst is conducted in further presence of 0.001 to 1% by weight of a sulfur compound, based on the xylenols, whereby industrially useful xylenols are obtained safely with a high selectivity and high yield.

Abstract: A process for producing p-hydroxybenzaldehyde through p-aminobenzaldehyde from p-nitrotoluene, comprising reacting p-nitrotoluene with sodium polysulphide in an alcohol-alkali aqueous solution mixed solvent in the presence or absence of an aprotic polar compound to produce p-aminobenzaldehyde, diazotizing the p-aminobenzaldehyde and then hydrolyzing the diazotized p-aminobenzaldehyde to produce p-hydroxybenzaldehyde.

Abstract: A coating composite containing sulfochlorinated polyolefin having a sulfur content ranging from 0.2 to 2.5% by weight and a chlorine content ranging from 18 to 37% by weight is applied directly as an adhesive layer or is applied on one surface of a thermoplastic resin base to be contacted with a metal surface, which resin base is coated on the metal surface.When the coating composite is pressed thereafter under a pressure, a coating on the metal surface with excellent adhesion, water and impact resistances is provided.

Abstract: A catalyst for removal of nitrogen oxides which shows extremely good catalytic activity and is excellent in durability and is low in the activity of oxidizing SO.sub.2 into SO.sub.3 be prepared at a low cost by impregnating a titanium oxide carrier with a vanadium sulfate, a vanadyl sulfate or a mixture thereof and then reacting a mixed gas consisting of 0.05 to 100% by mole of ammonia and 99.95 to 0% by mole of an inert gas which is inert to both ammonia and vanadium and vanadyl sulfates with the impregnated carrier while the reaction mixture is maintained at a temperature of 300.degree. to 520.degree. C., and preferably 370.degree. to 450.degree. C., or by shaping a mixture of titanium oxide and a vanadium sulfate, a vanadyl sulfate or a mixture thereof into a desired shape and then reacting a mixed gas consisting of 0.05 to 100% by mole of ammonia and 99.

Abstract: Industrially useful alkylphenyl sulfides are produced in high yield from phenyl mercaptan as a raw material by reaction of the phenyl mercaptan with an alkyl alcohol or dialkyl ether, or alkyl mercaptan or dialkyl sulfide having 1 to 4 carbon atoms as a novel alkylating agent at an elevated temperature, for example, 150.degree. to 600.degree. C, in a gaseous phase.

Abstract: Catalyst for removing nitrogen oxides, whose activity is lowered by poisoning with sulfur oxides, is contacted with an ammonia gas at a temperature of 200.degree. to 500.degree. C, whereby the sulfur oxides are liberated from the catalyst, and the catalyst is regenerated.Concentration of the ammonia gas to be used in the regeneration treatment must be at least 1% by volume and preferably 5 to 50% by volume of ammonia is used in a mixture with other inert diluting gas. The regenerated catalyst is given an activity as high as that before the poisoning without bringing about any damage and cracking to the catalyst.

Abstract: Pyridine is reacted with chlorine at a molar ratio of pyridine to chlorine of 0.5-10 : 1 in a gaseous phase in the presence of at least 0.2 moles, preferably 1 to 20 moles of steam per mole of pyridine under irradiation of ultraviolet rays of 2000-5000 A, thereby producing 2-chloropyridine.

Abstract: Pyridine is reacted with chlorine in the presence of water by photolytic reaction under irradiation of photolytic light, using halogenated hydrocarbon such as carbon tetrachloride as a diluent. When the amount of water added exceeds at least 0.01 moles per one mole of pyridine, an effect of water addition appears, but usually addition of 0.2 to 10 moles, preferably 0.5 to 5 moles of water per one mole of pyridine makes the reaction proceed smoothly without any trouble, and ensures increase in yield and selectivity of 2-chloropyridine. The present process can be carried out in either gaseous or liquid phase.