- Synthesis method of ultraviolet absorber UVA Plus
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The invention discloses a synthesis method of an ultraviolet absorber UVA Plus. The method comprises the following steps: step 1, carrying out esterification reaction on phthalic anhydride and n-hexanol to obtain an intermediate monohexyl phthalate without other solvents, enabling the yield to reach over 99%, and enabling the intermediate to be directly subjected to the next step of reaction without refining; step 2, performing an acylation reaction on 3-hydroxy-N, N-diethylaniline and the intermediate monohexyl phthalate under the catalysis of a composite catalyst to prepare an ultraviolet absorber UVA Plus product, enabling the yield to be over 90%. The synthesis method has the advantages of easily available raw materials, easy refining and purification of the product, high yield, low production cost, and suitableness for industrial production.
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Paragraph 0026; 0033-0035; 0041-0043; 0046-0048
(2020/08/22)
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- Ecotoxicity and biodegradation of phthalate monoesters
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Little is known about the fate and the effects of phthalic acid monoesters. Various of these monoesters ranging from n-butyl to isononyl monoester have been evaluated in respect to their biodegradation behaviour and their acute aquatic toxicity. All esters are readily biodegradable, achieving degradation rates of 90% and more. The acute toxicity values strongly depend on the carbon chain length of the alcohol moiety. The short chain specimen have LC/EC 50 around and above 100 mg/l, with values levelling off to around 30 mg/l for the isononyl monoester.
- Scholz, Norbert
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p. 921 - 926
(2007/10/03)
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