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US 2010/0137450 A1Published application
Process for the preparation of aqueous formaldehyde solutions
AssigneeBayer MaterialScience AG
InventorsHeniz-Herbert Müller, Stephan Ehlers, Andreas Schlemenat, Arnulf Werner, Martin Schiffhauer
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Abstract
Aqueous formaldehyde solutions are prepared and the formaldehyde content of the aqueous formaldehyde solutions produced is determined by an online analytical method. The desired formaldehyde content can subsequently be established by addition of water so that an aqueous formaldehyde solution having a defined formaldehyde content (formalin) is obtained.
Claims6
A continuous process for producing an aqueous formaldehyde solution having a formaldehyde content of from 25 to 56 wt. %, based on weight of aqueous formaldehyde solution comprising:
- a) oxidizing methanol to produce an aqueous formaldehyde solution, and
- b) determining formaldehyde content of the aqueous formaldehyde solution by online analysis,
- c) comparing the formaldehyde content determined in b) with a desired formaldehyde content, and
- d) optionally, adding water to obtain the desired formaldehyde content in the aqueous formaldehyde solution.
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