Method of making a calcium salt of...

Details Method of making a calcium salt of... Method of making a calcium salt of...

2005-06-07

2005-06-07

Dentz, Bernard (Department: 1625)

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acids and salts thereof

C562S580000

Reexamination Certificate

active

06903234

ABSTRACT:
A method of making calcium-2-hydroxy-4-(mercaptomethyl)butanoate includes combining and mixing 2-hydroxy-4-(mercaptomethyl)butanoic acid and a calcium salt selected from calcium oxide and calcium hydroxide and water in a first reaction zone. The combining and mixing step is carried out over a first period of 3-120 seconds. The resulting reaction mixture is transferred at the end of the first period from the first reaction zone to a second reaction zone, the transferring step being carried out over a second period of 3-60 seconds. Heat generated by reaction between the 2-hydroxy-4-(mercaptomethyl)butanoic acid and the calcium salt in the second reaction zone is allowed to drive off sufficient water to produce a product mixture containing less than 5% (m/m) water.

REFERENCES:
patent: 4335257 (1982-06-01), Cummins et al.
patent: 0140865 (1985-05-01), None

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