Patent ID: 9441157
Filing Date: 2016-09-13
CPC Classification: A23L,B01J,C09K

Claim Text:
1. A method of preparing an oxygen-absorbing composition, the method comprising: a) preparing a powdered mixture of an oxygen-absorbing substance and a catalyst having a non-organic salt of a transition metal; b) adding the powdered mixture to water to form a suspension of the oxygen-absorbing substance and the catalyst, the suspension having a concentration of between 67 and 133 g of the powdered mixture/liter of the water in the suspension; c) making an aqueous solution by adding hydrochloric acid to water in an amount to obtain a pH below about 1, and adding sodium silicate to the hydrochloric acid and water in an amount to obtain a pH of about 2 in the aqueous solution; d) adding the aqueous solution to the suspension; e) adding sodium silicate to the aqueous solution and the suspension under conditions in which the aqueous solution and suspension are being agitated at no greater than about 100 Hz to form a gel; f) resting the gel for a period of time between about 1 and 48 hours; g) washing the gel with water and substantially removing salts that result from the neutralization step; and h) drying the washed gel at temperatures between about 333.15° K and 363.15° K and at about atmospheric pressure or under vacuum and forming the oxygen-absorbing composition.