Abstract: The present invention relates to a method for preparing halogenated benzonitriles by vapor phase ammoxidation at a reaction temperature in the range of 300 to 500° C. in a fixed bed reactor using a three-component catalyst. More particularly, the method of the invention relates to a method for preparing 2,6-dichlorobenzonitrile (2,6-DCBN) from 2,6-dichlorotoluene (2,6-DCT) by vapor phase ammoxidation. The invention also relates to a three-component catalyst provided on a carrier and its use in a vapor phase ammoxidation reaction according to the invention. In addition, the invention provides a method for preparing the three-component catalyst.

Abstract: In the abatement of a waste disposal problem in the manufacture of vinyl chloride wherein 1,2 dichloroethane is an intermediate and a heavy residue is recovered as still bottoms, from the purification by distillation of dichloroethane and/or vinyl chloride having an organic-origin chloride content ranging between 55 and 80% by weight, wherein said heavy residue is reacted at 50.degree. to 100.degree. C., in aqueous medium with an alkali metal or an alkaline earth metal polysulfide, the proportion of polysulfide being equal at least to 30% by weight of the molar theoretical quantity, the average sulfur rank of polysulfide being more than 1 and up to and including 5, the pH of the reaction medium not exceeding 10.

Abstract: A retarding agent for cement consists essentially of in percent by weight:______________________________________ CaF.sub.2 50 - 65 Ca.sub.3 (PO.sub.4).sub.2 7 - 12 CaSO.sub.4 5 - 7.5 SiO.sub.2 10 - 20 Fe.sub.2 O.sub.3 1 - 2 Al.sub.2 O.sub.3 1 - 5, ______________________________________this retarding agent is preferably the insoluble residue by-product obtained by dissolving raw phosphate with an inorganic acid. It retards the setting of cement at high ambient temperatures, and can be used as well with sea water or with fresh water in the making of concrete and the like.

Abstract: A process for abating a waste disposal problem in the manufacture of vinyl chloride wherein 1,2 dichlorethane is an intermediate and a heavy residue is recovered as still bottoms, said process comprising reacting said heavy residue at 50.degree. to 100.degree. C., in aqueous medium with an alkali metal or an alkaline earth metal polysulfide, the proportion of polysulfide being equal at least to 30% by weight of the molar theoretical quantity, the average sulfur rank of polysulfide being more than 1 and up to and including 5, the pH of the reaction medium not exceeding 10.5 when the reaction is completed, and the obtained precipitate being separated from the reaction mother liquor, said precipitate being valuable organic polysulfide polymers containing 4-80% by weight of sulfur.

Abstract: The invention relates to novel halogenated alkylaryl ethers having at least one fluoroalkyl grouping, which have very good thermal stability and chemical resistance, and to a process for producing the ethers.

Abstract: Suitable as lubricants or dielectric fluids are ethers of the formula ##SPC1##Wherein X is F or H, at least one of the substituents X being F, n is a whole number at least equal to 1, R and R' being identical or different represent H or Cl.