Continuous thermo-insulation method for production of nitro-chlorobenzene
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- LANXESS DEUTDCHLAND GMBH
- Publication Date
- 2005-09-21
- Estimated Expiration
- Not applicable · inactive patent
Abstract
Description
technical field
[0001] The present invention relates to a process for the continuous adiabatic production of nitrochlorobenzene in which the spent sulfuric acid produced during the actual production process is reconcentrated and recycled to the nitration reaction. Background technique
[0002] Nitrochlorobenzene is an important intermediate for the preparation of dyes, pharmaceuticals and pesticides. There are special requirements for the ortho-nitrochlorobenzene, which is obtained by nitration of chlorobenzene with a yield of about 35%. p-Nitrochlorobenzene also has some industrial applications. There is basically no need to generate meta-nitrochlorobenzene, and its industrial application is very limited.
[0003] In industry, nitrochlorobenzene is produced by nitration of chlorobenzene. For the nitration reaction, a mixture of sulfuric acid, nitric acid and water is usually used. During the reaction, a large amount of spent sulfuric acid is produced, which pollutes the...