Dsm IP Assets B.v.

Eric Grolman

Rudy Rulkens

Renier Henricus Maria Kierkels

Geert Adelina Rudolf Vanden Poel

Bas Van Laarhoven

Michiel Muyris

Theo Joseph Cuypers

Tjay Tjien Tjioe

Konraad Albert Louise Hector Dullaert

Athanasios D Porfyris

Reinier Franciscus Petrus Grimbergen

Michal Kuczynski

Constantine D Papaspyrides

Geert Adelina Rudolf Poel Vanden

Michiel Jacobus Hubertus Muyris

Bas Laarhoven Van

Geert Adelina Rudolf Poel Van Den

The present invention relates to a process for preparing a granular nylon salt material, wherein an aqueous mixture, comprising at least 65 wt. % of salt components, and at most 35 wt. % of an aqueous medium, the weight percentages (wt. %) being relative to the total weight of the aqueous mixture, is flashed from a pressure vessel via a flash valve into a flash chamber, thereby evaporating the aqueous medium in an amount sufficient to result in a residual moisture content of at most 7.5 wt. %, and forming a granular nylon salt material. The invention also relates to a process for preparing a nylon polymer, comprising direct solid state polymerization of the granular salt material prepared by flash granulation.

Process for preparing nylon salt and its polymerization

The invention relates to a process for preparing a salt from diamine and dicarboxylic acid, the process comprising contacting a diamine gas, having a gas temperature T-gas, with a dicarboxylic acid, thereby forming a reaction mixture comprising diamine/dicarboxylic acid salt, wherein the dicarboxylic acid and the reaction mixture are kept at a temperature T-mixture of at least 10&#xb0; C. below the lowest of the melting temperature of the dicarboxylic acid (Tm-acid) and the melting temperature of the resulting diamine/dicarboxylic acid salt (Tm-salt). The invention also relates to a process for preparing a polyamide comprising preparing a salt from diamine and dicarboxylic acid.

Process for the preparation of diamine/dicarboxylic acid salts and polyamides thereof

The present invention also relates to a process for preparing a diamine/dicarboxylic acid salt wherein the dicarboxylic acid comprises an aromatic dicarboxylic acid and is provided in a powder form; the diamine is provided in a liquid form gradually dosed to the dicarboxylic acid powder, while keeping the dicarboxylic acid powder in constant movement; the processing temperature is above 0&#xb0; C. and below the boiling temperature of the diamine and the melting temperature of the acid and the salt, and the reaction mixture comprises at most 5 wt. % of water. The present invention also relates to an anhydrous diamine/dicarboxylic acid salt obtainable by the process according to invention, or any embodiment thereof as described above.

Process for preparing a diamine/dicarboxylic acid salt

The invention relates to a process for preparing a semi-aromatic polyamide from diamine and dicarboxylic acid, comprising steps of &#x2022;(i) dosing a liquid diamine to an agitated powder comprising an aromatic dicarboxylic acid thereby forming a powder comprising a diamine/dicarboxylic acid salt (DD-salt), and &#x2022;(ii) solid-state polymerizing the DD-salt to obtain the polyamide.

Process for the preparation of a polyamide

The invention relates to a process for the preparation of semi-crystalline semi-aromatic polyamide by direct solid-state polymerization of a diamine-dicarboxylic acid salt, comprising steps of (a) providing at least two salts of terephthalic acid and diamine, wherein each of these diamine/terephthalic acid salts is in solid state and has a melting temperature of at least Tx, wherein Tx is at least 260&#xb0; C.; (b) preparing a mixture of the diamine/terephthalic acid salts, while retaining the salts in solid state; and (c) heating the mixture obtained from step (b) in the solid state to a temperature (T-c) in the range from 200&#xb0; C. to 260&#xb0; C., under a pressure below the saturation vapor pressure of water at said temperature, thereby condensing and polymerizing the salts and forming a semi-crystalline semi-aromatic polyamide in solid form.

Process for producing a semi-aromatic semi-crystalline polyamide

The present invention relates to a continuous process for heat treatment of a particulate thermoplastic material comprising a thermoplastic semi-crystalline polymer in the solid state in a single flow-through installation comprising one or more heating zones, wherein each heating zone comprises a contact heater consisting of an array of heating plates, the granulate material is transported as a moving packed bed in the flow-through installation, the process comprises one or more heating steps and in each heating step the particulate material is heated through contact heating via the contact heater, or one of the contact heaters, and optionally a flow of inert gas is applied in one or more heating zones with a mass ratio G/M of at most 2, wherein G is the inert gas flow in kg/hour and M is the particulate material flow in kg/hour.

Process for heat treatment of semi-crystalline polymers

Process for the preparation of melamine, comprising a first mixing step in which at least two melamine-containing flows, originating from at least two different processes for the preparation of melamine, are brought into contact with each other, with a mixture being formed. In one embodiment, at least one melamine-containing flow contains melamine from a low-pressure gas-phase process for the preparation of melamine and at least one melamine-containing flow contains melamine from a high-pressure liquid-phase process for the preparation of melamine.

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Echt, Netherlands

Eric Grolman