Thyssen Krupp Ag

Thyssenkrupp Industrial Solutions Ag

Thyssenkrupp Uhde Gmbh

Yevgeny Makhynya

Walter Leitner

Joachim Johanning

Jürgen Klankermayer

Tarek El Hawary

Daniela Dostal

Nils Tenhumberg

Tarek El-Hawary

A process may be utilized to coat urea-containing granules with organic polymers. The process may involve compressing gaseous carbon dioxide and condensing the carbon dioxide to obtain liquid carbon dioxide, increasing the pressure and/or the temperature above the critical point of carbon dioxide and obtaining supercritical carbon dioxide, dissolving an organic polymer in the supercritical carbon dioxide to obtain a polymer-containing solution, and mixing the polymer-containing solution with urea-containing granules and lowering the temperature and/or the pressure below the critical point of carbon dioxide and obtaining coated urea-containing granules and gaseous carbon dioxide. In some cases the organic polymer may include biodegradable polymers, and the polymer-containing solution may contain between 20 to 70% by weight biodegradable polymers.

Use of supercritical COas solvent for organic polymers in a method for coating urea-containing granules

A process for preparing ammonia or ammonia and urea in a facility may involve compressing a crude synthesis gas stream that includes hydrogen, nitrogen, and carbon dioxide, washing a substream of the crude synthesis gas with ammonia to form a purified synthesis gas stream depleted of carbon dioxide and a condensate, synthesizing ammonia from the purified synthesis gas stream, and synthesizing urea from the condensate to form an aqueous urea composition. In the preparation of ammonia and urea, the crude synthesis gas stream may be, after being compressed, divided into a first synthesis gas substream and a second synthesis gas substream. In some instances, only the first synthesis gas substream is scrubbed with liquid ammonia.

Method for producing ammonia and urea in a common facility

Processes for separating carbon dioxide from CO2-containing gases and an apparatus for providing carbon dioxide for the synthesis of urea.

Method for the provision of carbon dioxide for the synthesis of urea

Growing community of inventors

Mülheim an der Ruhr, Germany

Yevgeny Makhynya