Abstract: In the production of styrene, spontaneous polymerization of styrene monomer causes reduced efficiency and as such it is desirable to prevent the formation of polymer by the addition of inhibitors. A known inhibiting composition is 3,5-di-tert-butyl-4-hydroxy-N,N-dimethylbenzyl amine and carboxylic acid, or an anhydride of said carboxylic acid which is added to a styrene-containing mixture. However large quantities are required and often portions of the inhibiting composition are not utilized resulting in nonproductive loss. The efficiency of the specific inhibitor can be improved by supplying air simultaneously with the inhibiting composition in a weight ratio of 3,5-di-tert-butyl-4-hydroxy-N,N-dimethylbenzyl amine to carboxylic acid to air, said ratio being 1:1-0.05:0.05-15.

Abstract: A method for preparing sterically hindered bis- or polyphenols of the formula: ##STR1## wherein R' is hydrogen, a C.sub.1 -C.sub.4 alkyl; R" and R"' the same or different and are each: ##STR2## wherein R is a tertiary C.sub.4 -C.sub.8 alkyl, R.sub.1 and R.sub.2 are the same or different and represent a C.sub.1 -C.sub.8 alkyl or a C.sub.6 -C.sub.8 cycloalkyl, or a C.sub.7 -C.sub.9 aralkyl, which comprises reacting the starting sterically hindered 2,4,6-trialkylphenols of the formula: ##STR3## wherein A is a C.sub.1 -C.sub.8 alkyl or a C.sub.6 -C.sub.8 cycloalkyl or a C.sub.7 -C.sub.9 aralkyl or a 3,5-dialkyl-2-hydroxybenzyl of the formula: ##STR4## B is a C.sub.1 -C.sub.8 alkyl, or a C.sub.6 -C.sub.8 cycloalkyl, or a C.sub.7 -C.sub.9 aralkyl, or a 3,5-dialkyl-4-hydroxybenzyl of the formula: ##STR5## wherein R.sub.1 and R are as identified above, with acetals, aldehydes or donors of C.sub.1 -C.sub.5 aldehydes in an acidic medium at a temperature within the range of from 60.degree. to 200.degree. C.

Abstract: A method of preparing trans-, trans-, trans-1,5,9-cyclododecatriene which comprises cyclotrimerization of butadiene at a temperature within the range of from 50.degree. to 150.degree. C. in the presence of a catalytic system consisting of a compound of bivalent nickel, an organo-aluminium compound of the formula (1) or (2):R.sub.3 Al (1)andR.sub.2 Al--X (R').sub.n (2)wherein R, and R' are each C.sub.2 H.sub.5 --, ##STR1## X is --O-- when n=1 and --N-- when n=2; and an activator, viz. a compound of formula (3) or (4):R.sub.3 Si--OR' (3)wherein R is an alkyl; R' is an alkyl, C.sub.6 H.sub.5 --, C.sub.6 H.sub.11,N(CRR'--CRR"--O).sub.3 B (4)wherein R and R" are each CH.sub.3 --, C.sub.2 H.sub.5 --, C.sub.6 H.sub.10, C.sub.8 H.sub.11 --, H--; R is H--.The method according to the present invention makes it possible to increase the yield of the desired product up to 95% by weight.

Abstract: A method for the production of 2,4,6-tri(3,5-ditertiary butyl-4-hydroxybenzyl)mesitylene which resides in treating a mesitylene solution in chloroalkane simultaneously with sulfuric acid used as a catalyst and a solution of 2,6-ditertiary butyl-4-methoxymethylphenol or bis-3,5-ditertiary butyl-4-hydroxybenzyl ether in chloroalkane at a temperature of -20.degree. to +20.degree. C. This results in a reaction mixture consisting of an acid phase and an organic phase including the target product. The phases are separated. The organic phase is subjected to neutralization by the treatment thereof with gaseous ammonia used as an alkaline agent. The precipitate of ammonium sulfate is separated and chloroalkane is removed from the remaining solution.The proposed method makes it possible to obtain the target product with a yield of 88 to 90% and a melting temperature of 239.degree. to 239.5.degree. C.The method prevents the formation of effluents, and the amount of phenol wastes is considerably reduced.

Abstract: A process for purifying isoprene produced by catalytic decomposition of dimethyldioxane from carbonyl compounds and cyclopentadiene which involves passing isoprene at a temperature of 40.degree. to 70.degree. C. through a bed of a solid product such as an anion exchange resin or alkali (the latter may be used with or without an inert carrier), followed by subjecting the isoprene to close fractionation performed with at least 50 theoretical plates and at a reflux ratio of at least 3. The process of the present invention enables practically complete purification of isoprene from carbonyl compounds and cyclopentadiene. The purified isoprene, when used as a monomer in the production of stereospecific isoprene rubber, results in high-quality products; and reduces by a factor of 2-3 the Ziegler catalyst consumption in the isoprene rubber synthesis.

Abstract: Method of removing aluminum-containing catalyst from phenol alkylation products comprises treating phenol alkylation products with water at a temperature of 165.degree.-250.degree. C., with water being in molar excess to aluminum in a range of 3-20. The resulting residue of meta-aluminate is easily separated by filtration.The present invention allows eliminating constant control of aluminum content in alkylation products, easily removing the catalyst therefrom and eliminating the loss of phenol alkylation products.

Abstract: A process for preparing cis-polyisoprene which comprises polymerization of isoprene in a medium of a non-polar hydrocarbon solvent at a temperature ranging from 0.degree. to 60.degree. C in the presence of a catalyst comprising a reaction product of titanium tetrachloride and an intracyclic organo-aluminium compound having the formula: ##STR1## wherein R, the same or different, are H, CH.sub.3 ; taken in a molar ratio of 1:1.05-1.1 respectively; weight ratio of isoprene to said catalyst being equal to 100:0.2-0.7.The present invention makes it possible to improve the quality of the thus-obtained cis-polyisoprene and to increase the catalyst capacity by two times due to modification of its properties.