Ceskoslovenska Akademie Ved

Vysoka Skola Chemicko-technologicka

Vladimir Kubanek

Jaroslav Kralicek

Bohuslav Casensky

Jiri Machacek

Jaroslava Kondelikova

Bedrich Porsch

Jaroslav Voslar

Zdenek Fencl

Jaroslav Rosol

Otomar Kriz

Jiri Budin

Eduard Sittler

Josef Skach

Gabriela Basarova

Jiri Marik

Zdenek Sterbacek

The invention pertains to a method for postpolymerization of granules of polyamide based on .epsilon.-caprolactam and formed by the anionic polymerization in melt and solves the problem of decreasing the content of low-molecular-weight substances in granules. At the same time, the invention pertains to an arrangement of equipment for performing the postpolymerization. The objective of the invention is a method for the continuous postpolymerization of polyamide based on .epsilon.-caprolactam and formed by the anionic polymerization in melt, wherein the postpolymerization proceeds in two stages, while the granules are heated in the first stage to the required temperature of postpolymerization 160.degree. to 200.degree. C. for 5 to 30 minutes during their vertical transport and allowed at this temperature for 2 to 6 hours in the second stage without mechanical intervention at their gravitation transport which is assisted by vibrations or a reservoir. An equipment for performing the method according to the invention which is formed by a two-stage unit consisting of a vertical vibration conveyer-heat exchanger and a reservoir, while the heat exchanger is provided with a heating jacket, a hopper in the lower part, and a heated overfall in the upper part, through which it is connected with the reservoir, while the reservoir is furnished outside with a jacket and a vibrator, inside with two plate heat-exchangers with the heating controlled by a temperature sensor, and in the lower part with a turnstile.

Method for postpolymerization of polyamide granules after polymerization

A column for preparative liquid chomatography is provided with an inlet tube (5) for injected sample, which is closed on the end with a gauze or fritted plate (6), passes through the center of a lower terminal (3), and ends in the distance equal to 70 to 90% of the total length of the column from the lower end of this tube, whereas the lower terminal (3) has at least four openings (7) or a circular slot or two half-slots which are placed outside the center of terminal on a concentric circle with diameter ranging between 40 to 70% of the inner diameter of column tube (1). The column operates in such a way, that mobile phase is introduced into the column through the center of the upper terminal (2) and a sample is injected into a sorbent through the inlet tube (5) for sample after stopping the flow of mobile phase and then the flow of mobile phase is restored.

Column for preparative liquid chromatography

A method is described for the anionic polymerization and copolymerization of .omega.-aminoacid lactams. This end is attained at elevated temperatures in the presence of a polymerization initiator of the formula

Method of anionic polymerization of .omega.-aminoacid lactams with

A method for treating beverages containing turbidity procursors and/or enzymes is described. The technique involves contacting the beverages with a diol or dicarboxylic acid polycondensate at a temperature ranging from 28.4.degree. to 176.degree. F., thereby resulting in separation of deleterious substance. The colloidal and taste qualities of the resultant beverages is thereby enhanced.

Method for stabilizing colloidal and taste qualities of beverages

A process of manufacturing sodium lactamoaluminates by reacting an excess of a lactam in an aromatic hydrocarbon with at least one compound selected from sodium tetrahydridoaluminate, trisodium hexahydridoaluminate, sodium dihydrido-bis(2-methoxyethoxo)aluminate, and sodium tetraamidoaluminate.

Process of manufacturing sodium lactamoaluminates

A method for the anionic polymerization of unsaturated monomers involves effecting reaction in the presence of an organic derivative of a metal alumina hydride in an amount ranging from 0.01 to 5.0 mol percent based upon the amount of unsaturated monomer.

Method of anioning polymerization of unsaturated monomers

Growing community of inventors

Kralupy, Czechoslovakia

Vladimir Kubanek