Recovery system for o-toluene sulfonamide and p-toluene sulfonamide mother liquor
By designing a toluenesulfonamide mother liquor recycling system containing multiple evaporation, separation and crystallization equipment, the problems of equipment blockage and wastewater discharge during the amide production process are solved, and efficient recycling of amide products and improvement of equipment efficiency are achieved.
Patent Information
- Application Number
- CN202420107955.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-16
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2034-01-16
AI Technical Summary
During the amide production process, the residual amide products in the 40% ethanol mother liquor cause equipment to be blocked, reduce treatment efficiency, increase the difficulty of treating three wastes, increase the COD emissions and treatment costs of wastewater.
A toluenesulfonamide mother liquor recovery system including ethanol evaporation mother liquor tank, membrane lifting evaporator, cyclone separator, ethanol film evaporator, crystallizer, crystallization cooler and plate and frame filter press was designed. By evaporation, separation and extraction Concentration, crystallization and solid-liquid separation are used to separate and recover amide products to reduce equipment blockage and wastewater discharge.
Effectively separate and recycle amide products, improve equipment efficiency, reduce wastewater COD emissions, reduce waste treatment costs, and improve product yield.
Smart Images
Figure CN222238796U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of chemical production, in particular to an o- and p-toluenesulfonamide mother liquor recovery system. Background Art
[0002] During the production of amides, 40% ethanol is required for refining. After crystallization and centrifugation, some amide products will remain in the ethanol mother liquor and enter the post-processing system together with the mother liquor. The precipitation of materials in the mother liquor causes equipment blockage, reduces equipment processing efficiency, and reduces product yield. At the same time, organic amines enter the three waste systems with the mother liquor, increasing the difficulty of three waste treatment.
[0003] Based on the above situation, the utility model proposes an o-toluenesulfonamide and p-toluenesulfonamide mother liquor recovery system, which can effectively solve the above problems. Utility Model Content
[0004] The purpose of the utility model is to provide an o-toluenesulfonamide mother liquor recovery system. The o-toluenesulfonamide mother liquor recovery system provided by the utility model can separate and recover a small amount of amide products in the amide production mother liquor, improve equipment efficiency, reduce product consumption; at the same time, reduce the discharge of wastewater COD and reduce the cost of three waste treatment.
[0005] The utility model is realized by the following technical solutions:
[0006] A system for recovering o-toluenesulfonamide mother liquor comprises an ethanol evaporation mother liquor tank, a rising film evaporator, a cyclone separator, an ethanol thin film evaporator, a crystallizer, a crystallization cooler and a plate-frame filter press; the ethanol evaporation mother liquor tank transports the amide production mother liquor inside to the rising film evaporator through a pipeline for preheating; the rising film evaporator transports the preheated amide production mother liquor to the cyclone separator through a pipeline for primary distillation; the cyclone separator transports the liquid phase material separated from the primary distillation material to the ethanol thin film evaporator through a pipeline for concentration; the ethanol thin film evaporator transports the concentrated liquid phase material to the crystallizer and the crystallization cooler through a pipeline for cooling and crystallization; the crystallizer transports the crystal slurry material after crystallization to the plate-frame filter press through a pipeline for solid-liquid separation to obtain a solid amide product; the plate-frame filter press transports the obtained solid amide product to bags through a conveying track.
[0007] According to the above technical solution, as a further preferred technical solution of the above technical solution, two ethanol evaporation mother liquor pumps are connected in parallel between the ethanol evaporation mother liquor tank and the rising film evaporator.
[0008] According to the above technical solution, as a further preferred technical solution of the above technical solution, the gas phase outlets of the cyclone separator and the ethanol thin film evaporator are both connected to an ethanol condenser.
[0009] According to the above technical solution, as a further preferred technical solution of the above technical solution, a liquid material circulation pump is connected between the crystallizer and the crystallization cooler.
[0010] According to the above technical solution, as a further preferred technical solution of the above technical solution, a cooling water circulation pump is connected between the cooling water outlet and the cooling water inlet of the crystallization cooler through a pipeline.
[0011] According to the above technical solution, as a further preferred technical solution of the above technical solution, two slurry discharge pumps are connected in parallel between the crystallizer and the plate and frame filter press.
[0012] Compared with the prior art, the utility model has the following advantages and beneficial effects:
[0013] The utility model provides an o-toluenesulfonamide mother liquor recovery system, which can separate and recover a small amount of amide product in the amide production mother liquor, improve equipment efficiency, and reduce product consumption; at the same time, it reduces the discharge of wastewater COD and reduces the cost of three waste treatment. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 This is a process flow chart of the utility model. DETAILED DESCRIPTION
[0015] In order to enable those skilled in the art to better understand the technical solution of the utility model, the preferred implementation scheme of the utility model is described below in conjunction with specific embodiments. However, it should be understood that the drawings are only used for illustrative purposes and cannot be understood as a limitation on this patent. In order to better illustrate this embodiment, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted. The positional relationship described in the drawings is only used for illustrative purposes and cannot be understood as a limitation on this patent.
[0016] A system for recovering o-toluenesulfonamide mother liquor comprises an ethanol evaporation mother liquor tank 1, a rising film evaporator 2, a cyclone separator 3, an ethanol thin film evaporator 4, a crystallizer 5, a crystallization cooler 6 and a plate-frame filter press 7; the ethanol evaporation mother liquor tank 1 transports the amide production mother liquor inside to the rising film evaporator 2 through a pipeline for preheating; the rising film evaporator 2 transports the preheated amide production mother liquor to the cyclone separator 3 through a pipeline for primary steaming; the cyclone separator 3 transports the liquid phase material separated from the primary steamed material to the ethanol thin film evaporator 4 through a pipeline for concentration; the ethanol thin film evaporator 4 transports the concentrated liquid phase material to the crystallizer 5 and the crystallization cooler 6 through a pipeline for cooling and crystallization; the crystallizer 5 transports the crystal slurry material after crystallization to the plate-frame filter press 7 through a pipeline for solid-liquid separation to obtain a solid amide product; the plate-frame filter press 7 transports the obtained solid amide product to bags through a conveying track 8.
[0017] The utility model can separate and recover a small amount of amide product in amide production mother liquor, improve equipment efficiency, and reduce product consumption; at the same time, it can reduce the discharge of waste water COD and reduce the cost of three waste treatment.
[0018] Furthermore, in another embodiment, two ethanol evaporation mother liquor pumps 9 are connected in parallel between the ethanol evaporation mother liquor tank 1 and the rising film evaporator 2 .
[0019] Furthermore, in another embodiment, the gas phase outlets of the cyclone separator 3 and the ethanol film evaporator 4 are both connected to an ethanol condenser 10. By providing the ethanol condenser 10, the gas generated by the cyclone separator 3 and the ethanol film evaporator 4 can be condensed and recovered.
[0020] Furthermore, in another embodiment, a liquid circulation pump 11 is connected between the crystallizer 5 and the crystallization cooler 6 .
[0021] Furthermore, in another embodiment, a cooling water circulation pump 12 is connected between the cooling water outlet and the cooling water inlet of the crystallization cooler 6 through a pipeline.
[0022] Furthermore, in another embodiment, two slurry discharge pumps 13 are connected in parallel between the crystallizer 5 and the plate and frame filter press 7 .
[0023] According to the description and drawings of the utility model, those skilled in the art can easily manufacture or use the o-toluenesulfonamide mother liquor recovery system of the utility model, and can produce the positive effects recorded in the utility model.
[0024] Unless otherwise specified, in the present invention, the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicating orientation or positional relationships are based on the orientation or positional relationships shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the orientation or positional relationship in the present invention are only used for illustrative purposes and cannot be understood as limitations on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood in conjunction with the drawings and according to specific circumstances.
[0025] Unless otherwise specified and limited, in the present invention, the terms "disposed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0026] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification or equivalent changes made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the present invention.
Claims
1. A system for recovering o-toluenesulfonamide and p-toluenesulfonamide mother liquor, characterized in that: The invention comprises an ethanol evaporation mother liquor tank (1), a rising film evaporator (2), a cyclone separator (3), an ethanol thin film evaporator (4), a crystallizer (5), a crystallization cooler (6) and a plate-frame filter press (7); the ethanol evaporation mother liquor tank (1) transports the amide production mother liquor inside to the rising film evaporator (2) through a pipeline for preheating; the rising film evaporator (2) transports the preheated amide production mother liquor to the cyclone separator (3) through a pipeline for primary evaporation; the cyclone separator (3) transports the liquid phase material separated from the primary evaporation material to the ethanol thin film evaporator (4) through a pipeline for concentration; the ethanol thin film evaporator (4) transports the concentrated liquid phase material to the crystallizer (5) and the crystallization cooler (6) through a pipeline for cooling and crystallization; the crystallizer (5) transports the crystal slurry material after crystallization to the plate-frame filter press (7) through a pipeline for solid-liquid separation to obtain a solid amide product; the plate-frame filter press (7) transports the obtained solid amide product to be bagged through a conveying track (8).
2. A system for recovering o-toluenesulfonamide and p-toluenesulfonamide mother liquor according to claim 1, characterized in that: Two ethanol evaporation mother liquor pumps (9) are connected in parallel between the ethanol evaporation mother liquor tank (1) and the rising film evaporator (2).
3. A system for recovering o-toluenesulfonamide and p-toluenesulfonamide mother liquor according to claim 1, characterized in that: The gas phase outlets of the cyclone separator (3) and the ethanol thin film evaporator (4) are both connected to an ethanol condenser (10).
4. A system for recovering o-toluenesulfonamide and p-toluenesulfonamide mother liquor according to claim 1, characterized in that: A liquid material circulation pump (11) is connected between the crystallizer (5) and the crystallization cooler (6).
5. A system for recovering o-toluenesulfonamide and p-toluenesulfonamide mother liquor according to claim 4, characterized in that: A cooling water circulation pump (12) is connected between the cooling water outlet and the cooling water inlet of the crystallization cooler (6) via a pipeline.
6. A system for recovering o-toluenesulfonamide and p-toluenesulfonamide mother liquor according to claim 1, characterized in that: Two slurry discharge pumps (13) are connected in parallel between the crystallizer (5) and the plate-frame filter press (7).