E.i. Dupont De Nemours and Company

Derrick Otieno Okull

Eric Guy Sumner

Ethan Baruch Solomon

Thomas Peter Tufano

Dwayne William Dischert

Scott C Glynn

Luiz Eduardo Biazi

Pedro Goncalo Carvalhais Teixeira Dias Jorge

A fermentation process for the production of ethanol from natural sources, such as corn, comprising introducing a fermentable sugar, an inoculant, and a stabilized chlorine dioxide into a fermentation system is disclosed. The stabilized chlorine dioxide is added preventatively to the fermentation system, at concentrations in the fermentation system of acetic acid no greater than 0.30% (weight/volume) and lactic acid no greater than 0.60% (weight/volume). The stabilized chlorine dioxide is added in an amount effective to substantially prevent growth of bacteria.

Prevention of bacterial growth in fermentation processes

A process to preserve a carbohydrate feedstock against contaminant microorganisms comprises contacting the carbohydrate feedstock with a stabilized chlorine dioxide at a pH of at least 2.6. The carbohydrate feedstock preferably comprises a naturally-occurring carbohydrate, particularly a carbohydrate having a reducing end group. The process is particularly suitable to treat feedstocks used in biorefining processes, such as in ethanol fermentation.

Stabilized chlorine dioxide to preserve carbohydrate feedstocks

A method for controlling growth of contaminant microorganisms in a fermentation process using a nitrogen-free peroxygen-releasing compound. The method comprises adding the nitrogen-free peroxygen-releasing compound to one or more steps of a fermentation process. In this method, the a nitrogen-free peroxygen-releasing compound may be added to one or more components of a fermentation broth comprising inoculant, fermentable sugar and process water.

Control of contaminant microorganisms in fermentation processes with peroxygen-releasing compounds

Growing community of inventors

Pleasanton, CA, United States of America

Derrick Otieno Okull