Patents by Inventor Thomas STETTEN

Thomas STETTEN has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method for producing isocyanates in the gas phase
    Patent number: 10836713
    Abstract: The invention relates to a method for producing isocyanates by phosgenating the corresponding primary amines in the gas phase, wherein the raw gaseous reaction product mixture is cooled and partially condensed by being brought into contact with at least one flow of a quenching liquid, and using a part of the condensed reaction product mixture as a component, optionally the only component, of the at least one flow of the quenching liquid after an additional cooling process. The quenching liquid used in total comprises, based on the total mass, organic solvents in a proportion of maximally 25% by mass, and the remainder of up to 100% by mass consists of at least the isocyanate to be produced. Furthermore, the reaction product mixture components which are not condensed under the influence of the quenching liquid are freed of isocyanate components in a scrubber column, and a scrubber liquid- and isocyanate-containing liquid flow is obtained with, based on the total mass, a content of organic solvents of 0.
    Type: Grant
    Filed: June 6, 2018
    Date of Patent: November 17, 2020
    Assignee: Covestro Deutschland AG
    Inventors: Joachim Zechlin, Thomas Stetten
  • METHOD FOR PRODUCING ISOCYANATES IN THE GAS PHASE
    Publication number: 20200190021
    Abstract: The invention relates to a method for producing isocyanates by phosgenating the corresponding primary amines in the gas phase, wherein the raw gaseous reaction product mixture is cooled and partially condensed by being brought into contact with at least one flow of a quenching liquid, and using a part of the condensed reaction product mixture as a component, optionally the only component, of the at least one flow of the quenching liquid after an additional cooling process. The quenching liquid used in total comprises, based on the total mass, organic solvents in a proportion of maximally 25% by mass, and the remainder of up to 100% by mass consists of at least the isocyanate to be produced. Furthermore, the reaction product mixture components which are not condensed under the influence of the quenching liquid are freed of isocyanate components in a scrubber column, and a scrubber liquid- and isocyanate-containing liquid flow is obtained with, based on the total mass, a content of organic solvents of 0.
    Type: Application
    Filed: June 6, 2018
    Publication date: June 18, 2020
    Applicant: Covestro Deutschland AG
    Inventors: Joachim ZECHLIN, Thomas STETTEN