1
Achim Hartmann, Hans Thumm: Process for the production of coarse, scrubbing aggregates of titanium dioxide particles by oxidation of titanium tetrachloride in the vapor phase and use of said aggregates for the prevention of deposit formation in the same production process. Kronos Titan, Burns Doane Swecker & Mathis, November 15, 1988: US04784841 (16 worldwide citation)

A process for the production of coarse scrubbing aggregates of TiO.sub.2 particles by vapor phase oxidation of titanium tetrachloride. The particle aggregates of sizes above 0.15 mm are separated from the TiO.sub.2 fines by wet screening on a moving screen, calcined and returned to the process. In a ...


2
Achim Hartmann, Achim Kulling, Hans Thumm: Process for recovery of iron oxide and chlorine from dust produced in chlorination of titaniferous ores. Kronos Titan G m b H, November 29, 1977: US04060584 (9 worldwide citation)

The dust produced in the chlorination of titaniferous ores comprises essentially particulate ferrous chloride plus solid contaminants including coke and various metal chlorides and oxides and is oxidized in successive stages at relatively low temperatures to recover particulate iron oxide and gaseou ...


3
Achim Hartmann: Process for the production of titanium dioxide. Kronos, Evenson Wands Edwards Lenahan & McKeown, March 23, 1993: US05196181 (8 worldwide citation)

A process for the production of titanium dioxide through the reaction of vaporous TiCl.sub.4 with oxygen under a pressure of between 2.4 and 3.4 bar, and a corresponding apparatus are used to achieve long permanent operation times. The oxygen required is indirectly preheated to between 850.degree. a ...


4
Achim Hartmann, Dietrich W Schonherr: Device for the cooling of hot gaseous solids suspensions. Kronos Titan, Browning Bushman Zamecki & Anderson, February 11, 1986: US04569387 (7 worldwide citation)

The invention concerns a device for the cooling of hot gaseous solids suspensions, particularly for the cooling of hot gaseous TiO.sub.2 suspensions resulting from the production of titanium dioxide by vapor phase oxidation of titanium tetrachloride. The device consists of a number of coaxially conn ...


5
Achim Hartmann: Process utilizing titanium dioxide as a catalyst for the hydrolysis of carbonyl sulfide. Kronos, Michael J Cronin, August 24, 1999: US05942201 (7 worldwide citation)

The hydrolysis of carbonyl sulfide is substantially improved by utilizing titanium dioxide particles as a catalyst. It is especially favorable, if the titanium dioxide particle are sintered and treated with sodium hydroxide or sodium aluminate. Through such a treatment, the catalyst can be regenerat ...


6
Achim Hartmann: Process for the separation of volatile chlorine compounds from the exhaust gases resulting from the chlorination of titanium-containing raw materials. Kronos Titan, Burns Doane Swecker & Mathis, August 6, 1985: US04533530 (7 worldwide citation)

A process for the separation of volatile chlorine compounds from exhaust gases resulting from the chlorination of titanium-containing raw material by the treatment of the exhaust gases with an aqueous media in several stages and the absorption of the volatile chlorine compounds in the aqueous media. ...


7
Achim Hartmann: Process for increasing the yield in the manufacture of titanium dioxide by the chloride process. Kronos, June 4, 2002: US06399033 (7 worldwide citation)

An improvement to the chloride process of making titanium dioxide. By recycling some of the cyclone dust, the yield in the chlorination of titanium-containing raw materials can be increased. In order to prevent silica accumulation in the fluidized bed, the cyclone dust is divided into two fractions. ...


8
Achim Hartmann, Herman Trub: Metal chloride generator and improved process for the production of metal chlorides used in the manufacture of titanium dioxide by the chloride process. Kronos, Michael J Cronin, November 4, 1997: US05683669 (6 worldwide citation)

In the preparation of metal chlorides from their elements to be used as additives in processes of making titanium dioxide by the chloride process, a titanium tetrachloride stream is directed to sweep over the lined inner wall of a metal chloride generator to act as a protective film, which considera ...


9
Siegfried Blumel, Achim Hartmann, Hans Thumm, Hans Hermann Luginsland, Franz Rosendahl: High solids content titanium dioxide suspension. Rheox, Michael J Cronin, February 28, 1995: US05393510 (5 worldwide citation)

A finely divided chloride process titanium dioxide prepared without the use of a dispersing agent. The slurry is dewatered via filtration, and the resulting filter cake is made flowable with an anionic dispersing agent. In order to attain a filter cake with very high solids content, the slurry shoul ...


10
Achim Hartmann, Ulrich Rothe, Dieter Schinkitz: Process for purifying a technical iron chloride solution by selective precipitation. Kronos, Michael J Cronin, April 18, 1995: US05407650 (4 worldwide citation)

A process for purifying an acidic technical-grade iron chloride solution formed from cyclone dust from the production of TiO.sub.2 in accordance with the chloride process by adjusting the pH with a first neutralizing agent and thereafter introducing the pH adjusted solution in a controlled manner in ...