Abstract: A novel chemical compound--a high-molecular crystalline polymer with alternating dimethylene and methyl-substituted disilene units in the main chain of the formula: ##STR1## wherein n is an integer of from 800 to 1,000. A method for preparing this polymer consists in that vapors of 1,2-bis(dimethylchlorosilyl)ethane is subjected to interaction with vapors of metallic sodium and/or potassium at a temperature within the range of from 250.degree. to 380.degree. C. under a pressure of 1,2-bis(dimethylchlorosilyl)ethane of from 0.1 to 10 mm Hg, followed by condensation of vapors of the resulting 1,1,2,2-tetramethyl-1,2-disilacyclobutane and polymerization thereof at a temperature within the range of from 20.degree. to 100.degree. C.One of embodiments of the method for preparing this polymer comprises polymerization in bulk of 1,1,2,2-tetramethyl-1,2-disilacyclobutane at a temperature within the range of from 20.degree. to 25.degree. C.

Abstract: A novel chemical compound, viz. 1,1,2,2-tetramethyl-1,2-disilacyclobutane has the formula: ##STR1## A method for preparing 1,1,2,2-tetramethyl-1,2-disilacyclobutane comprises reacting vapors of 1,2-bis(dimethylchlorosilyl)ethane with vapors of metallic sodium and/or potassium at a temperature within the range of from 250.degree. to 380.degree. C. under a pressure of vapors of 1,2-bis(dimethylchlorosilyl)ethane of from 0.1 to 10 mm Hg, followed by condensation of vapors of the resultant desired product.

Abstract: Block-copolymers of vinyltrialkylsilane-hexaorganocyclotrisiloxane of the formula: ##STR1## wherein R, R' are the same or different and each R.sub.3 represent methyl, phenyl; R.sub.1, R.sub.2, R.sub.3 --are each an aliphatic radical containing 1 to 4 carbon atoms, Z is a residue of a dilithium initiator of polymerization of a vinyltrialkylsilane K is a residue of a monolithium initiator, which is a hydrocarbon radical- normal or iso-alkyl; K' is hydrogen, an (R.sub.3) Si silcarbonic group wherein R is a C.sub.1 -C.sub.4 alkyl radical, or a hydrocarbon radical; a=0 to 10.sup.4 ; b=0 to 10.sup.4 ; C=10 to 10.sup.4 ; d=10 to 10.sup.4 ; f=0 to 1; g=0 to 1, x.gtoreq.1, with a molecular mass of from 10.sup.3 to 10.sup.6.

Abstract: A process for purifying aromatic hydrocarbons contained in liquid products of refining petroleum fractions or liquid products of coal coking or low-temperature carbonization from non-aromatic hydrocarbons which comprises heat-treatment of said liquid products at a temperature ranging from 750.degree. to 950.degree. C. under a pressure within the range of from 1 to 10 atm in the presence of acyclic C.sub.2 -C.sub.4 hydrocarbons employed separately or in various combinations at a weight ratio between said acyclic hydrocarbons and said liquid products being of at least 0.3. The heat-treatment results in a vapor-gas mixture which is cooled to isolate a condensate containing predominantly aromatic hydrocarbons. The process is technologically simple and makes it possible to purify aromatic hydrocarbons practically without decomposition thereof.

Abstract: A process for petroleum refining to obtain petroleum products having a reduced content of sulphur, oxygen-and nitrogen-containing compounds which comprises introducing into the petroleum during distillation volatile and nonvolatile carbonyl compounds of transition metals selected from the group consisting of Cr, V, Mo, W, Mn, Re, Fe, Co, Ni in amounts of from 0.02 to 0.2% by weight of the petroleum at a temperature ranging from 150.degree. to 350.degree. C under a pressure of from 1 to 7 atm abs. and distilling the petroleum into the desired products.Gasoline and kerosene resulting from such processing have a 5 to 10 times reduced content of mercaptan sulphur and 2 to 10 times reduced total sulphur content, as well as a reduced content of gums.

Abstract: A self-lubricating heat-resistant material which, in accordance with the invention, comprises from 20 to 90 percent by weight of a polymer binder, viz. poly(butadiene) with a degree of cross-linking from 30 to 95 percent, and from 10 to 80 percent by weight of an antifriction filler, viz. molybdenum disulphide, graphite, boron nitride or a mixture thereof; said material is produced, in accordance with the invention, by pressing a composition consisting of from 20 to 90 percent by weight of poly(butadiene) of molecular weight between 20,000 and 800,000 and from 10 to 80 percent by weight of said antifriction filler, the process being effected at a temperature in the range from 200.degree. to 330.degree. C. and a pressure of from 1,000 to 7,000 kg/sq.cm.The self-lubricating heat-resistant material of the invention exhibits thermal stability at temperatures of up to 350.degree. C., a stable coefficient of friction and excellent wear resistance in the temperature range from -150.degree. to +350.degree. C.