PROCESS FOR THE DEPOLYMERISATION OF POLYSTYRENE

    公开(公告)号:US20220324777A1

    公开(公告)日:2022-10-13

    申请号:US17641474

    申请日:2020-09-17

    Abstract: The invention relates to a process for the preparation of styrene monomers by depolymerising polystyrene, to a device for carrying out the process and to the use of a fluidised bed reactor for the depolymerisation of polystyrene. Said process comprising the following steps: a) feeding a polymer composition (A) containing 60 to 99.9 wt. polystyrene, based on the total weight of the polymer composition (A), into the reaction zone (R) of a pyrolysis reactor (P); b) thermally cracking the polystyrene contained in the polymer composition (A) in the reaction zone (R) of the pyrolysis reactor (P) at a temperature of between 400° C. to 1000° C. to obtain a product mixture (G) containing styrene monomers and other components; c) removing the product mixture (G) obtained in step b) from the reaction zone (R) of the pyrolysis reactor (P); d) cooling the product mixture (G) removed in step c) to obtain a condensed product mixture (K) containing styrene monomers and further components; and e) separating the styrene monomers from the further components of the condensed product mixture (K) obtained in step d), wherein the average residence time (Z) of the polymer composition (A) in the reaction zone (R) of the pyrolysis reactor (P) is from 0.01 sec to 10 sec.

    PROCESS FOR THE PRODUCTION OF FIBRE-REINFORCED-COMPOSITES

    公开(公告)号:US20200231766A1

    公开(公告)日:2020-07-23

    申请号:US16648465

    申请日:2018-09-26

    Abstract: The invention relates a process for preparing a fibre-reinforced composite (K) comprising the following steps: (a) Providing at least one continuous fibrous reinforcement material (A); (b) Providing at least one matrix polymer composition (B) having melt volume-flow rate (MVR (220/10) according to ISO 1133) of 40 to 70 mL/10 min and a viscosity number VN (according to DIN 53726) of 45 to 75 ml/g; (c) Applying the at least one matrix polymer composition (B) to at least one surface of the at least one continuous fibrous reinforcement material (A) to obtain a layered arrangement; (d) Heating the layered arrangement obtained in step (c) to a first temperature (T1) sufficiently above the glass transition temperature (Tg) of the at least one substantially amorphous matrix polymer composition (B) to obtain a substantially liquid substantially amorphous matrix polymer composition (B); (e) Allowing the substantially liquid matrix polymer composition (B) to impregnate the at least one continuous fibrous reinforcement material (A); (f) Cooling the thus obtained polymer-impregnated continuous fibrous reinforcement material (A) to a second temperature (T2) below the glass transition temperature (Tg) of the at least one substantially amorphous matrix polymer composition (B) in order to obtain a fibre-reinforced composite (K); wherein substantially amorphous matrix polymer composition (B) is a thermoplastic styrene-based substantially amorphous matrix polymer composition (B) and wherein least one of the process steps (d) and/or (e) is carried out at a temperature in the range of 230 to 330° C.

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