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Methods of producing substantially anatase-free titanium dioxide with silicon halide addition

A titanium dioxide, anatase technology, applied in the direction of titanium dioxide, titanium oxide/hydroxide, fibrous fillers, etc.

Inactive Publication Date: 2006-10-18
MILLENNIUM INORGANIC CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the conditioner is only premixed in the first step

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] Titanium tetrachloride is preheated and introduced into the reactor. Based on the titanium dioxide formed, the AlCl in the mixture 3 Can provide 5.8wt% Al by reaction with oxygen 2 o 3 . Titanium tetrachloride / AlCl 3 The mixture is separated into two streams by a flow control device. The first stream is introduced into the first reaction zone through the titanium tetrachloride holes of the first reactor section. At the same time, preheated oxygen is introduced into the reactor through an additional inlet into the reaction zone. About 0.56wt% (as TiO 2 Gravity SiO 2 ) into one of the titanium tetrachloride streams followed by contact with oxygen. Reactor pressure was about 14 psig. The titanium dioxide suspension formed is introduced into the flue duct. The titanium dioxide is separated from the cooled gaseous product by filtration. The particle size distribution of the product titanium dioxide and the percentage of rutile were detected. The average particle ...

Embodiment 2

[0081] Titanium tetrachloride is preheated to 350°C, mixed with halogen and passed through a bed containing aluminum. The silicon tetrachloride feed rate corresponds to a titania production rate of 14.5 metric tons / h (mtph). The exothermic reaction between chlorine and aluminum produces aluminum halides and heat. The heat of reaction makes TiCl 4 / AlCl 3 The temperature of the mixture is increased to a temperature of about 450-460°C at the entry point of the reactor. Aluminum trichloride in the mixture provides 1 wt% Al based on titanium dioxide formed by reaction with oxygen 2 o 3 . TiCl 4 / AlCl 3 The mixture is separated into two streams by a flow control device. The first stream is introduced into the first reaction zone through the titanium tetrachloride tank of the first reactor section. At the same time, the oxygen preheated by hydrocarbon combustion is further heated to about 1500°C and introduced into the reactor through an additional inlet into the reaction z...

Embodiment 3

[0083] Repeat the test as the method of Example 2, the difference is that 0.22% silicon tetrachloride (with TiO 2 Gravity SiO 2 ) into the titanium tetrachloride stream, which is then reacted with oxygen. The amount of detergent (ie sodium chloride) used was about 0.8% of the titanium dioxide produced. Detect the particle size distribution of the product titanium dioxide, the percentage of rutile and the isoelectric point. The average particle size is 0.328 μm with a standard deviation of 1.404. The rutile content is greater than 99.8 wt%, and the pH at the isoelectric point is 5.2.

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PUM

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Abstract

The present invention provides a method of producing titanium dioxide substantially free of anatase, the method comprising mixing titanium tetrachloride and a silicon compound to form a mixture; and introducing the mixture and oxygen into a reaction zone to produce titanium dioxide substantially free of anatase, wherein the pressure in the reaction zone is greater than 55 psig.

Description

[0001] This application claims priority to US Patent 09 / 789,394, filed February 20, 2001, entitled "Process for Producing Titanium Dioxide Substantially Free of Anatase by Addition of Silicon Halides," the entire disclosure of which is incorporated herein by reference. Background of the invention [0002] Titanium dioxide is an important pigment in the production of paints, plastics and coatings. Considerable research effort has been devoted to bringing titanium dioxide pigments to the desired properties (ie fine particle size, gloss and durability). [0003] One method of producing titanium dioxide is to react titanium tetrachloride with oxygen. The reaction is performed by heating the gaseous reactants (TiCl 4 and oxygen) to a temperature of preferably 650 to 1200°C. Some prior art documents describe the TiCl 4 Or oxygen is introduced into the reaction zone thereby reducing these heating requirements. [0004] Description of prior art Modification of TiCl with chemicals ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G23/07C09C1/36
CPCC01G23/07C01P2004/62C09C1/3653
Inventor 卡玛尔·M·阿科塔埃里克·J·埃勒南希·L·菲茨杰拉德马修·E·詹姆逊约翰·R·斯耐德
Owner MILLENNIUM INORGANIC CHEM