一种邻三氟甲基苯甲酸的连续合成系统
By designing a continuous synthesis system for o-trifluoromethylbenzoic acid, the problem of the lack of continuous production in o-trifluoromethylbenzoic acid synthesis systems was solved, realizing low-cost and high-efficiency o-trifluoromethylbenzoic acid production, and reducing waste liquid discharge and labor costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 利民化学有限责任公司
- Filing Date
- 2025-07-09
- Publication Date
- 2026-07-17
AI Technical Summary
The existing o-trifluoromethylbenzoic acid synthesis system lacks a continuous production system, resulting in high production costs, large amounts of wastewater and waste acid discharge, and high manual batch switching costs.
A continuous synthesis system for o-trifluoromethylbenzoic acid is designed, comprising a primary tubular reactor, an o-methyltrifluorotoluene gas-liquid separator, and a secondary tubular reactor connected in series. Fluorination and oxidation reactions are carried out using a dynamic tubular reactor, and waste liquid emissions are reduced by vaporizing and recovering HF.
This technology enables continuous production of o-trifluoromethylbenzoic acid, reduces wastewater and waste acid emissions, lowers labor costs, and improves production safety, output, and quality.
Smart Images
Figure CN224507062U_ABST
Abstract
Claims
1. A continuous synthesis system of o-trifluoromethylbenzoic acid, characterized by, It includes a primary tubular reactor (1), an o-methyltrifluorotoluene gas-liquid separator (2), a secondary tubular reactor (3), and an o-trifluoromethylbenzoic acid gas-liquid separator (4), which are connected in sequence by pipelines.
2. A continuous synthesis system of o-trifluoromethylbenzoic acid according to claim 1, characterized in that, Both the primary tubular reactor (1) and the secondary tubular reactor (3) are dynamic tubular reactors.
3. The continuous synthesis system for o-trifluoromethylbenzoic acid according to claim 2, characterized in that, The dynamic tubular reactor is equipped with a dynamic stirring device inside the pipe, and the dynamic tubular reactor is also equipped with a segmented temperature control system (25), a pressure gauge (26) and a thermometer (27).
4. The continuous synthesis system for o-trifluoromethylbenzoic acid according to claim 1, characterized in that, Both the o-methyltrifluorotoluene gas-liquid separator (2) and the o-trifluoromethylbenzoic acid gas-liquid separator (4) are gas-liquid separators with temperature control systems.
5. The continuous synthesis system for o-trifluoromethylbenzoic acid according to claim 1, characterized in that, The primary tubular reactor is equipped with an o-methylbenzoic acid inlet, an SF4 inlet, an HF inlet, and a primary mixture outlet. The top of the o-methyltrifluorotoluene gas-liquid separator (2) is provided with a primary mixture inlet and an HF exhaust port (13), and the bottom of the o-methyltrifluorotoluene gas-liquid separator (2) is provided with an o-methyltrifluorotoluene outlet. The two-stage tubular reactor is equipped with an o-methyltrifluorotoluene inlet, a tert-butyl hydrogen peroxide inlet, an oxygen inlet, a solvent inlet, and a secondary mixture outlet. The top of the o-trifluoromethylbenzoic acid gas-liquid separator (4) is provided with a secondary mixture inlet, an oxygen outlet (21) and an o-trifluoromethylbenzoic acid outlet (22).
6. The continuous synthesis system for o-trifluoromethylbenzoic acid according to claim 5, characterized in that, The o-methylbenzoic acid inlet is connected to the o-methylbenzoic acid storage tank (6) through the first feed pipe (5); The SF4 inlet is connected to the SF4 storage tank (8) via an air inlet pipe A (7). The HF inlet is connected to the HF storage tank (10) via the air inlet pipe B (9).
7. The continuous synthesis system for o-trifluoromethylbenzoic acid according to claim 5, characterized in that, The primary mixture outlet and the primary mixture inlet are connected by a second pipe (11); The discharge port of the secondary mixture and the inlet of the secondary mixture are connected through the first pipe (20).
8. The continuous synthesis system for o-trifluoromethylbenzoic acid according to claim 5, characterized in that, The o-methyltrifluorotoluene outlet and the o-methyltrifluorotoluene inlet are connected by a third pipe (12); The tert-butyl hydrogen peroxide inlet is connected to the tert-butyl hydrogen peroxide storage tank (14) via the second inlet pipe (15). The oxygen inlet is connected to the oxygen storage tank (17) via the air inlet pipe C (16). The solvent inlet is connected to a solvent storage tank (19) via a third feed pipe (18).
9. The continuous synthesis system of ortho-trifluoromethylbenzoic acid according to claim 5, characterized in that, Downstream of the o-trifluoromethylbenzoic acid gas-liquid separator (4), a distillation device (28) and a filter washing and drying integrated machine (29) are connected in sequence via pipelines; the filter washing and drying integrated machine (29) is provided with an o-trifluoromethylbenzoic acid discharge port (30).
10. A continuous synthesis system of o-trifluoromethylbenzoic acid according to any one of claims 1-9, characterized in that, A power pump (23) is installed on the first feed pipe (5), the second feed pipe (15), the third feed pipe (18), and the third pipe (12); Flow meters (24) are installed on the first feed pipe (5), the second feed pipe (15), the third feed pipe (18), the third pipe (12), the air inlet pipe A (7), the air inlet pipe B (9), and the air inlet pipe C (16); Back pressure valves (31) are also installed on the second pipe (11) and the first pipe (20).