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Gosudarstvennaya Akademia Nefti Gaza Im. I.m.gubkina

Aktsionernaya Kompania Po Transportu Nefti 'transneft'

Aktsionernoe Osbchestvo 'nauchno-teknicheskaya Korporatsia' Chistaya Vode

Institut Geokhimii I Analiticheskoi Khimii Im.v.i.vernadskogo Ran

Eduard Grigorievich Novitsky

Nikolai S Nametkin

Semen Ilich Gdalin

Natalya K Gladkova

Larisa Ivanovna Mironova

Alexandr Sergeevich Dzhardzhimanov

Valentina G Filippova

Valery Davydovich Chernyaev

Anatoly Nikolaevich Dmitrievsky

Vladimir Pavlovich Vasilevsky

Kaplan Saferbievich Basniev

Boris Antonovich Rudenko

Jury Anatolievich Rakhmanin

Sergei G Durgarian

Ruslan Khazhsetovich Khamizov

Vladimir V Teplyakov

Evgeny Gennadievich Abramov

Olga Vladimirovna Fokina

Boris Fedorovich Myasoedov

Mikhail Ekhilievich Shvarts

A method for complex procesing of sea-water comprises the successive steps of mechanical filtration, calcium separation on modified zeolite, magnesium separation on weak-acid cation exchanger and processing of the resulting softened sea-water, regeneration of the modified zeolite and regeneration of the weak-acid cation exchanger. During the step of processing of the softened sea-water, its desalination it carried out so as to produce fresh water and simulatneously produce secondary brine having a concentration of salts at least as high as 100 g/l whereby the modified zeolite is regenerated. A plant for implemention of the method of complex processing of sea-water comprises a filter, two sorption columns for calcium separation connected in parallel with each other, a sorption unit for magnesium separation, a softened sea-water processing unit and a mixed concentrate processing unit.

Method for complex processing of sea-water

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. A method for preparing these block-copolymers comprises polymerization of vinyltrialkylsilanes in the presence of mono- or dilithiumorganic initiators, whereafter a solution of a hexaorganocyclotrisiloxane is added to the reaction mixture and polymerization is effected to give intermediate block-copolymers, whereafter the polymerization is stopped or the intermediate block-copolymers are combined by means of a cross-linking agent, followed by recovery of the desired product. The block-copolymers according to the present invention feature a high selectivity of permeation for certain gases. Thus, the ratio of permeability constants for oxygen and nitrogen (P.sub.O.sbsb.2 /P.sub.N.sbsb.2) is as high as 3.5. At the same time, the absolute value of gas-permeability constants is also high, i.e. P.sub.O.sbsb.2 is as high as 1.4.times.10.sup.-8 cm.sup.3.cm/cm.sup.2 cm Hg.sec.

Block-copolymers of vinyltrialkylsilane-hexaorganocyclotrisiloxanes and

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Moscow, Russia

Eduard Grigorievich Novitsky