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US 6,821,334 B2Granted
Process for producing sulfonated solid particles
AssigneeDainichiseika Color & Chemicals Mfg. Co., Ltd.
InventorsMichiel Nakamura, Yoshiyuki Zama, Hisao Okamoto, Atsushi Nogami, Naoyuki Sakai, Hideyuki Koiso
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Abstract
A process produces a sulfonated solid particle by burning sulfur to yield gaseous sulfur dioxide, subjecting the gaseous sulfur dioxide to catalytic oxidation to yield gaseous sulfur trioxide, and sulfonating a dry powdery or granular solid particle with the gaseous sulfur trioxide in a gas phase-solid phase reaction.
Claims20
A process for producing a sulfonated solid particle, comprising the steps of:
- burning sulfur to yield gaseous sulfur dioxide;
- catalytically oxidizing the gaseous sulfur dioxide to yield gaseous sulfur trioxide;
- and
- sulfonating a dry powdery or granular solid particle with the gaseous sulfur trioxide in a gas phase-solid phase reaction, wherein the solid particle is at least one selected from the group consisting of organic pigments, carbon blacks and water-insoluble dyes.
1 more element
Dependencies are inferred from the claim text.