Neutralization Process
AssigneeBASF SE
InventorsMichael de Marco, Matthias Weismantel, Karl J. Possemiers, Filip Mees, Ronny De Kaey
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Abstract
The invention relates to a neutralization process in which at least one ethylenically unsaturated carboxylic acid is preneutralized at least partly with a base, wherein the preneutralized solution is divided into at least two part-solutions and at least one part-solution is aftertreated so as to form part-solutions with different degree of neutralization and/or solids content, and also to an apparatus for carrying out the process.
Claims23
A process for preparing two or more water-absorbing polymers in which at least one ethylenically unsaturated carboxylic acid in solution is preneutralized at least partly with a base, optionally with addition of water, which comprises dividing the preneutralized solution into at least two part-solutions, at least one part-solution being aftertreated to form part-solutions with a different degree of neutralization and/or solids content, wherein each part-solution is independently polymerized to provide two or more different water-absorbing polymers.
(canceled)
An apparatus for continuous neutralization, comprising
- i) a ring line R,
- ii) at least one first inlet Z1 into the ring line R,
- iii) at least one second inlet Z2 into the ring line R,
- iv) at least one heat exchanger W in the ring line R, the heat exchanger W being disposed beyond the inlets Z1 and Z2 in a flow direction,
- v) at least two outlets An from the ring line R, the outlets An being disposed beyond the heat exchanger W in the flow direction,
- vi) at least one inlet ZXn1 and/or ZXn3 in at least one outlet An,
- vii) a pump P, and
- viii) optionally, a vessel B between the heat exchanger W and the outlets An.
Dependencies are inferred from the claim text.