Sulfur-based fertilizer and process for production thereof

Details Sulfur-based fertilizer and process for production thereof Sulfur-based fertilizer and process for production thereof

1995-03-06

1996-11-05

Lewis, Michael

Chemistry: fertilizers

Processes and products

Inorganic material

71 53, 71 63, C05B 700

Patent

active

055713033

ABSTRACT:
A particulate sulfur-based fertilizer comprising a uniform dispersion of sulfur and at least one member selected from the group consisting of ammonium sulfate, ammonium phosphate and mixtures thereof, the sulfur having an average particle size of less than about 100 .mu.m. A process for producing a sulfur-based fertilizer is also described. The process comprises: (i) providing a first stream comprising ammonia; (ii) providing a second stream comprising a least one member selected from the group consisting of sulfuric acid, phosphoric acid and mixtures thereof; (iii) providing a third stream comprising an aqueous liquid; (iv) mixing the first stream, the second stream and the third stream to provide a liquid reaction mixture; (v) feeding the liquid reaction mixture to a mixer; (vi) feeding a fourth stream comprising molten sulfur to the mixer; (vii) maintaining a pressure drop across the mixer of at least about 200 kPa to form a homogenized melt of sulfur-based fertilizer; and (viii) solidifying the homogenized melt to produce the particulate sulfur-based fertilizer.

REFERENCES:
patent: 4330319 (1982-05-01), Bexton et al.
patent: 4589904 (1986-05-01), Harrison et al.
patent: 5112379 (1992-05-01), Young
patent: 5378259 (1995-01-01), Bassetti et al.
patent: 5383951 (1995-01-01), Cross et al.

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