Process and system for producing pigments directly from componen

Details Process and system for producing pigments directly from componen Process and system for producing pigments directly from componen

1998-12-14

2000-05-02

Bell, Mark L.

Compositions: coating or plastic

Materials or ingredients

Pigment, filler, or aggregate compositions, e.g., stone,...

423184, 423199, C09C 140, C09D 1700

Patent

active

060568135

ABSTRACT:
A process for making white pigment directly from constituent materials without byproducts. The process comprises the steps of inputting three material flows comprising a sulphate source, an alkali source, and an aluminum source. And, recycling and mixing into the three material flows a process return from a separation and wash stage and vapors from a pressure let-down stage. This is followed by heating and holding a mixture of recycled process returns and the three material flows at elevated pressure in a reactor for a minimum predetermined residence time. Afterwards, letting down pressure in a flow from the reactor to produce a pre-wash flow. Then, separating, classifying, and delaminating the pre-wash flow into a first and second pigment or filler that are differentiated by their respective average particle distribution sizes.

REFERENCES:
patent: 5895523 (1999-04-01), Rendall et al.

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