![](/CAS/GIF/81-39-0.gif)
Solvent Red 52 synthesis
- Product Name:Solvent Red 52
- CAS Number:81-39-0
- Molecular formula:C24H18N2O2
- Molecular Weight:366.41
Yield: 97.5%
Reaction Conditions:
with boric acid at 100 - 120;Large scale;Green chemistry;
Steps:
1-7; 9
(d) Add intermediate B to a 5000L enamel reactor, add 1200 kg of p-toluidine, 120 kg of boric acid, and raise the temperature to 100-120 ° C for condensation reaction (HPLC detection to determine the end point), then cool down to add methanol solvent to isolate, cool down Filtration to 30~40 °C, filter cake washed with 400 kg of methanol, collecting filtrate and bubble washing liquid, distilling and recovering solvent (containing p-toluidine, methanol); filter cake and then washing with 80~90 °C hot water to neutral, After drying, pulverizing and packaging, the finished product of hydrazine and pyridone dyes was 1296 kg (yield was 97.5%, ΔE 0.203, ΔC 0.019 was similar, pressure value was 0.15).
References:
Anhui Qing Keruijie New Materials Co., Ltd.;Zhou Lixia;Yang Qingshui;Tao Yimin;Liu Yong CN109705608, 2019, A Location in patent:Paragraph 0021-0027; 0029
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123 suppliers
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