Patents by Inventor Karlheinz Miltenberger

Karlheinz Miltenberger 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).

  • Process for the continuous preparation of esters of lower aliphatic carboxylic acids with lower alcohols
    Patent number: 5637761
    Abstract: In the esterification of aliphatic C.sub.2 -C.sub.6 -carboxylic acids with aliphatic C.sub.1 -C.sub.4 -alcohols, the ester formed is removed by azeotropic distillation together with the water of reaction. After the water of reaction has been separated in a separating condenser, the ester phase is freed, by washing with water, from acid carried over, and water and alcohol are then removed by distilling off a small fraction of the ester.In this way no salt-containing effluents are produced. The ester is obtained in a very good yield, free from acid and alcohol.
    Type: Grant
    Filed: November 30, 1992
    Date of Patent: June 10, 1997
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Karlheinz Miltenberger, Manfred Schmidt, Karl Petz
  • Process for the reaction of a low-molecular hydroxyl compound with a carboxylic acid halide
    Patent number: 5292928
    Abstract: In a process for reacting a low molecular weight hydroxy compound with a carboxylic acid halide, a small amount of the acid halide is introduced into the reaction vessel and the remainder of the acid halide and the hydroxy compound are added gradually in an approximately stoichiometric ratio. The hydrogen halide formed is thus prevented from dissolving in the reaction medium. The heat of reaction to be dissipated is negligible.
    Type: Grant
    Filed: July 31, 1992
    Date of Patent: March 8, 1994
    Assignee: Hoechst Aktiengesellschaft
    Inventor: Karlheinz Miltenberger
  • Process for the preparation of dichloro- or trichloroacetyl chloride
    Patent number: 5030753
    Abstract: In the conversion of trichloroethene and tetrachloroethene into dichloroacetyl chloride (DAC) or trichloroacetyl chloride (TAC) by means of oxygen, the reaction mixture is passed several times as a thin film through the reaction zone. The reaction time for achieving a certain conversion is in this way reduced.In the preparation of DAC, a constant content of acid chloride is established in the reaction mixture by removing some of the mixture and working this up by distillation, while the circulating reaction mixture is simultaneously topped up with fresh trichloroethene.In this way, side reactions are suppressed and the amount of by-products is reduced.
    Type: Grant
    Filed: October 4, 1990
    Date of Patent: July 9, 1991
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Walter Freyer, Karlheinz Miltenberger, Manfred Schmidt