Abstract: Agglomerates of spheroidal masses of malachite crystals are prepared so that they contain silicic acid. These agglomerates can be used to prepare a copper-acetylide complex, which in turn can be used as a catalyst for the preparation of 1,4-butynediol from acetylene and formaldehyde.

Abstract: Agglomerates of spheroidal masses of malachite crystals are prepared so that they contain silicic acid. These agglomerates can be used to prepare a copper-acetylide complex, which in turn can be used as a catalyst for the preparation of 1,4-butynediol from acetylene and formaldehyde.

Abstract: A process for regenerating suspended heavy metal catalysts used in the synthesis of butynediol from acetylene and formaldehyde. The aqueous catalytic slurry removed from the reaction mixture is raised to a temperature of about 200.degree. to 500.degree. C., where appropriate with air supplied, and is left at this temperature with air being supplied, until the carbon content of the catalytic substance is about 0.5 to 3%.

Abstract: A process is disclosed for preparing aliphatic compounds containing two conjugated double bonds cis-cis or cis-trans, characterized in that a compound of the general formula ##STR1## (in which R is H, alkyl from C.sub.1 to C.sub.10, or OY in which Y is a protective group selected from the class consisting of tetrahydropyranyl and 1-ethoxyethyl; X is an ester function selected from the class consisting of the acetates) is reacted with an alkyl-magnesium halide of the general formula:Z--Mg--R.sup.1 (II)(in which Z is chlorine, bromine or iodine, and R.sup.1 is a C.sub.1 -C.sub.10 alkyl group, or a group (CH.sub.2).sub.n OY in which Y has the same meaning as in formula (I), and n is a number from 3 to 10) in the presence of Li.sub.2 CuCl.sub.4, CuCl, CuBr, or CuI at temperatures ranging from about -30.degree. to +10.degree. C. in the presence of ethyl ether or tetrahydrofuran as solvent, to obtain an aliphatic compound of the general formula:R--CH.sub.2 --C.tbd.C--CH.dbd.CH--CH.sub.2 R.sup.

Abstract: In the ethynylation of formaldehyde in the presence of a copper acetylide catalyst to produce butynediol, pH is controlled by the incremental or continuous addition of an alkali metal hydroxide and an alkali metal carbonate at an equivalent ratio of hydroxide ion to carbonate ion of 1:1-4:1.

Abstract: The process for the preparation of 1,4-butynediol through the reaction of acetylene with formaldehyde in the presence of a catalytic metal, preferably copper, is improved by using, as the support of the catalytic metal, a molecular sieve or synthetic zeolite to which the catalytic metal is chemically bonded through an ion exchange reaction.There are obtained increased production rates and selectivity and the polymer of acetylene, namely cuprene, is essentially prevented from being formed.

Abstract: Process for carrying out exothermic reactions between a gas and a liquid in the presence of a solid catalyst by passing the gas and the liquid cocurrently through a packed reaction vessel, preferably of elongated shape, wherein the gas and liquid pass through the packed reaction vessel in transition flow.

Abstract: Formaldehyde in crude BYD, can be reacted to a polymeric substance in the presence of NaOH or Na.sub.2 CO.sub.3 at high temperatures.

Abstract: An asymmetric synthesis process which involves addition of optically active chelated organometal compounds of lithium, sodium, beryllium, magnesium, zinc, copper and cadmium to prochiral unsaturated substrates. The optically active chelating agent is not consumed and can be recycled.

Abstract: When acetylene flow to the continuous, aqueous ethynylation reaction of formaldehyde and acetylene, using a copper acetylide complex as the catalyst, is interrupted, resulting cuprene formation can be inhibited by maintaining the reaction mass at a pH of 3.5-5 until normal acetylene flow is resumed.

Abstract: Synthetic malachite of desirable particle size and distribution is coprecipitated with small amounts of uniformly dispersed bismuth. After nucleation, the crystals are grown at elevated temperatures. The malachite can be converted into a cuprous acetylide complex useful as an ethynylation catalyst.

Abstract: Spheroidal agglomerates of malachite crystals are prepared by bringing together solutions of a cupric salt, a bismuth salt and an alkali metal carbonate or bicarbonate to form a mixture containing amorphous hydrated copper carbonate, and then holding the mixture, without agitation, at a temperature of less than about 55.degree. C.

Abstract: In accordance with the present invention, there is provided herein an improved low pressure, stirred, catalytic process by which butynediol can be produced continuously at a high rate of production, under safe conditions, and without simultaneously forming an excessive amount of undesirable by-products. The process of this invention can be carried out by heating acetylene and formaldehyde, at relatively low temperatures as compared to other processes using supported catalysts, in the presence of a stirred aqueous slurry of a finely-divided complex cuprous acetylide catalyst prepared from a precursor containing greater than 20% and less than 35% by weight of copper, and 0-3%, preferably 2-3%, by weight of bismuth, as the oxides, on a magnesium silicate carrier.

Abstract: The invention relates to acetylenic glycols having the formula : ##STR1## wherein R is hydrogen or an alkenyl group, and to their derivatives obtained through hydrogenation or ethoxylation reactions, these compounds showing outstanding surface active properties. The invention relates also to the process for the preparation of the subject compounds starting from 6-methyl-5-hepten-2-one.

Abstract: There is provided herein an improved, more continuous, low pressure ethynylation process for the production of butynediol which comprises first continuously reacting formaldehyde and acetylene in a reaction zone at low pressures, in a stirred aqueous medium, in the presence of a finely-divided ethynylation catalyst, to form a reaction product mixture containing butynediol and catalyst slurry. Then the reaction product mixture is withdrawn and continuously and simultaneously filtered and concentrated to form two streams, a catalyst-free filtrate stream and a flowable, concentrated catalyst slurry stream, the latter being capable of immediate recycling to the reaction zone without further treatment. The filtrate stream containing the butynediol is available for purification and further operations.

Abstract: This disclosure describes novel erythro 15,16-dioxy prostenoic acids and esters useful as bronchodilators, hypotensives and gastric acid secretion inhibitors.

Abstract: This disclosure describes novel 15,16-dioxy prostenoic acids and esters useful as bronchodilators, anti-inflammatory agents, hypotensives and gastric acid secretion inhibitors.

Abstract: The corrosion of ferrous metals by corrosive acids at elevated temperatures is inhibited by adding to environments containing the acids an effective amount of a novel .alpha., .OMEGA. (hereinafter "alpha", "omega", respectively) diacetylenic diol (e.g., with two acetylenic functionalities) having the structural formula: ##STR1## where R is an aliphatic, alicyclic or aromatic residue containing from 1 to about 12 carbon atoms and may include one or more functional groups such as halogen atoms, carbonyl, carboxyl, carbamyl, amino, formyl or nitroso radicals or other functional groups without impaired performance. The diacetylenic diols may be employed in combination with other corrosion inhibitors.

Abstract: Spheroidal agglomerates of malachite crystals are prepared by bringing together solutions of a cupric salt, a bismuth salt and an alkali metal carbonate or bicarbonate to form a mixture containing amorphous hydrated copper carbonate, and then holding the mixture, without agitation, at a temperature of less than about 55.degree. C.

Abstract: Synthetic malachite of desirable particle size and distritution is coprecipitated with small amounts of uniformly dispersed bismuth. After nucleation, the crystals are grown at elevated temperatures. The malachite can be converted into a cuprous acetylide complex useful as an ethynylation catalyst.

Abstract: Butynediol is prepared by reacting acetylene and formaldehyde in contact with a heavy metal acetylide as catalyst, in the liquid phase by the Reppe method. Acetylene is fed upwardly through a suspension of the catalyst in formaldehyde at such a rate that it is virtually completely consumed and a liquid zone containing no catalyst is formed above the suspension.