SULFAMIC ACID PRODUCTION PROCESS Russian patent published in 2004 - IPC

Abstract RU 2240977 C1

FIELD: industrial organic synthesis.

SUBSTANCE: process comprises oleum-sulfurization of urea, filtration of underluted sulfurization mixture, recrystallization of crude sulfamic acid paste from recycling mother liquor preheated to temperature not higher than 75^oC, wherein concentration of sulfuric acid 19-22% is maintained. Weight ratio of sulfamic acid paste to recrystallization liquid is 1:(6-8).Yield of sulfamic acid (calculated as urea) is 83-85%. Filtrate remaining after isolation of sulfamic acid paste from sulfurization mixture represents about 96% sulfuric acid at most 1% of sulfamic acid and can be used in related production fields.

EFFECT: simplified technology, reduced sulfuric acid consumption, and improved yield and quality of product with minimum equipment units and low power consumption.

2 cl, 1 dwg, 1 tbl, 5 ex

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RU 2 240 977 C1

Authors

Utrobin A.N.

Zimina T.A.

Karetnikov S.V.

Konovalov A.V.

Kochetov A.P.

Fefelov P.A.

Dates

2004-11-27—Published

2003-09-08—Filed