Process for the preparation of electronic grade isopropyl hydroxylamine
By employing a segmented distillation-recrystallization-solid-liquid separation process, the instability of free hydroxylamine as a base was solved, resulting in the production of high-purity isopropyl hydroxylamine. This process meets the safety and stability requirements of the electronics industry, reduces production costs, and improves efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- JINING KENDRAY CHEM TECH CO LTD
- Filing Date
- 2026-02-27
- Publication Date
- 2026-05-29
AI Technical Summary
In the existing technology, hydroxylamine free base as a photoresist stripping solution has the risks of instability and explosion, and has a short shelf life, making it difficult to meet the safety and stability requirements of the electronics industry, and there is a lack of effective alternatives.
A combined process of fractional distillation-recrystallization-solid-liquid separation was adopted. By controlling the temperature of the distillation vessel and the condenser outlet temperature, high-purity isopropyl hydroxylamine solid primary product was separated, and high-purity electronic-grade isopropyl hydroxylamine product was obtained by recrystallization and centrifugation.
This method enables the preparation of isopropyl hydroxylamine with high purity and high yield, meeting the purity, ion content, and particle requirements of SEMI C36 standards. It reduces production costs, improves production efficiency, and provides a safer and more stable raw material for photoresist stripping solution.
Smart Images
Figure CN122102942A_ABST