Toluene diisocyanate production system and toluene diisocyanate production method
By combining a distillation column and a partition wall column system, the problems of low impurity separation efficiency and rigid isomeric ratio adjustment in the traditional toluene diisocyanate production have been solved. This has enabled the production of high-purity TDI products with a high isomeric ratio, reduced energy consumption and equipment complexity, and met the requirements of high-end polyurethane products.
CN121338372BActive Publication Date: 2026-07-24WANHUA CHEM GRP CO LTD
Patent Information
- Application Number
- CN202511495652.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-20
- Publication Date
- 2026-07-24
- Estimated Expiration
- 2045-10-20
Smart Images
Figure CN121338372B_ABST
Abstract
The application discloses a toluene diisocyanate production system and a toluene diisocyanate production method, which comprise a rectifying tower, a partition wall tower and a pipeline system for connecting the rectifying tower and the partition wall tower; the top of the rectifying tower is connected with the middle part of the partition wall tower, and the kettle part of the rectifying tower is connected with the middle part of the partition wall tower; the partition wall tower comprises a rectifying section arranged near the top of the partition wall tower and used for removing light component impurities, an isomer regulating section arranged in the middle part of the partition wall tower and used for regulating an isomer ratio and a stripping section arranged near the kettle part of the partition wall tower and used for concentrating heavy component impurities. The toluene diisocyanate production system integrates efficient impurity removal, accurate isomer ratio regulation and energy consumption optimization, can meet the strict requirements of high-end polyurethane products on the purity and isomer ratio of TDI, realizes separation and purification of refined TDI products and outputs TDI products with controllable isomer ratios.
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Citation Information
Patent Citations
Bulkhead type rectification column for separating materials containing ethylbenzene and vinyl benzene
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Method for purifying toluene vulcabond by recuperative distilling tower for final purifying
CN1496978A