Liquid mo ca production apparatus

Abstract

The utility model relates to the technical field of chemical equipment relates to a liquid MOCA production device, including the mixed jar, micro -reactor, pipeline type reactor, continuous neutralizing device, continuous washing device, temporary storage jar, first filter, second filter, dehydrator and mix and prepare kettle that pass through pipeline and metering pump are communicated in proper order, the feed inlet of mixed jar is communicated to dilute hydrochloric acid jar and OCA jar through pipeline and metering pump respectively, and the discharge opening of mixed jar is communicated to the feed inlet of micro -reactor, and the feed inlet of micro -reactor still is communicated to the discharge opening of formaldehyde jar through pipeline and metering pump, still be equipped with sight glass monitor on the communication pipeline between first filter and second filter, and the feed inlet of second filter still is communicated to the discharge opening of auxiliary material jar through metering pump, the utility model discloses can produce liquid MOCA, and production process is simple, and the degree of automation is high, and safe and environment -friendly, is suitable for industrial production.

Description

Technical Field

[0001] This utility model relates to the field of chemical equipment technology, and in particular to a liquid MOCA production device. Background Technology

[0002] Diamine or polyamine curing agents or chain extenders are widely used in production and daily life. 3,3′-dichloro-4,4′-diaminodiphenylmethane (MOCA) is one of the most widely used aromatic diamine chain extenders. It is widely used in the machinery industry, automobile and aircraft manufacturing, mining industry and sports facilities (such as plastic running tracks and plastic flooring) and various light industrial manufacturing. It can also be used as a crosslinking agent for polyurethane coatings and adhesives, a curing agent for epoxy resins, and to produce products with high electrical resistance.

[0003] Existing 3,3′-dichloro-4,4′-diaminodiphenylmethane products generally have melting points between 98℃ and 112℃. They require melting before use, followed by holding at that temperature until stable, and then mixing with other materials. In applications such as coatings and waterproofing materials where hardness and elasticity are not critical, and in long-term construction processes, repeated melting or prolonged holding wastes significant energy. Furthermore, high-concentration mixtures require maintaining high temperatures to prevent crystallization, but prolonged high temperatures negatively impact material properties and appearance, leading to inconvenience. Therefore, there is market demand for MOCA products that are liquid at room temperature or have low melting points, but no publicly disclosed production facilities for such products have been found. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a liquid MOCA production device that overcomes the defects of the prior art, can produce liquid MOCA, and has a simple production process, a high degree of automation, is safe and environmentally friendly, and is suitable for industrial production.

[0005] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows:

[0006] A liquid MOCA production apparatus includes a mixing tank, a microreactor, a pipeline reactor, a continuous neutralization device, a continuous washing device, a temporary storage tank, a first filter, a second filter, a dehydrator, and a mixing vessel connected sequentially via pipelines and metering pumps (the outlet of the preceding device is connected to the inlet of the following device); the inlet of the mixing tank is connected to a dilute hydrochloric acid tank and an OCA (o-chloroaniline) tank via pipelines and metering pumps respectively, the outlet of the mixing tank is connected to the inlet of the microreactor, and the inlet of the microreactor is also connected to the outlet of the formaldehyde tank via pipelines and metering pumps; a sight glass monitor is also installed on the connecting pipeline between the first filter and the second filter; the inlet of the second filter is also connected to the outlet of the auxiliary material tank via a metering pump;

[0007] Metering pumps, sight glass monitors, mixing tanks, dilute hydrochloric acid tanks, OCA tanks, formaldehyde tanks, microreactors, pipeline reactors, continuous neutralization devices, continuous washing devices, temporary storage tanks, first filters, auxiliary material tanks, second filters, dehydrators, and mixing kettles are all electrically connected to the DCS automatic control system.

[0008] Preferably, all the metering pumps are hydraulic diaphragm metering pumps.

[0009] Preferably, the mixing vessel is an enamel-lined reactor.

[0010] Preferably, the microreactor is a microchannel tubular reactor.

[0011] Preferably, the tubular reactor is a static mixing type tubular reactor. The tubular reactor has several U-shaped bends, which allow for segmented temperature control.

[0012] Preferably, both the continuous neutralization device and the continuous washing device are centrifugal extractors. The continuous neutralization device and the washing device are configured the same, except that the connection direction during discharge is different. During neutralization, the material outlet is the outlet for the light components, and during washing, the material outlet is the outlet for the heavy components.

[0013] Preferably, the first filter is a pipeline filter cartridge; the second filter is a precision sintered filter; and the sight glass monitor includes a high-transparency lens and a vision sensor controller.

[0014] Preferably, the dehydrator is a scraped rotary thin-film evaporator.

[0015] Preferably, the mixing vessel is a dual planetary power mixing vessel equipped with a circulation device.

[0016] Preferably, the DCS automatic control system is a UW500a distributed control system.

[0017] After adopting the above technical solution, the beneficial effects of this utility model are:

[0018] This invention first mixes a fixed amount of dilute hydrochloric acid and OCA raw materials in a mixing tank, and then, together with formaldehyde, enters a microreactor via a metering pump for continuous condensation. After the reaction in the microreactor, the mixture is transferred to a continuous pipeline reactor for staged temperature-controlled reaction. Then, it enters a continuous neutralization device for neutralization treatment, and then enters a continuous water washing device for washing. The washed material is temporarily stored, and then after a first filtration, auxiliary materials are added. After a second filtration and dehydration process, and after being uniformly stirred by the external circulation of the mixing tank, a liquid MOCA product can be prepared.

[0019] In summary, this invention can produce liquid MOCA, and the production process is simple, highly automated, safe and environmentally friendly, making it suitable for industrial production. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present utility model;

[0021] The components include: 1. Mixing tank; 2. Microreactor; 3. Pipeline reactor; 4. Continuous neutralization device; 5. Continuous washing device; 6. Temporary storage tank; 7. First filter; 8. Second filter; 9. Dehydrator; 10. Mixing vessel; 11. Dilute hydrochloric acid tank; 12. OCA tank; 13. Formaldehyde tank; 14. Sight glass monitor; and 15. Auxiliary material tank. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0023] Example 1:

[0024] like Figure 1 As shown, a liquid MOCA production apparatus includes a mixing tank 1, a microreactor 2, a pipeline reactor 3, a continuous neutralization device 4, a continuous washing device 5, a temporary storage tank 6, a first filter 7, a second filter 8, a dehydrator 9, and a mixing vessel 10, which are sequentially connected via pipelines (not shown) and metering pumps (not shown). The inlet of the mixing tank 1 is connected to a dilute hydrochloric acid tank 11 and an OCA tank 12 via pipelines and metering pumps, respectively. The outlet of the mixing tank 1 is connected to the inlet of the microreactor 2, and the inlet of the microreactor 2 is also connected to a formaldehyde tank via pipelines and metering pumps. The discharge port of 13; a sight glass monitor 14 is also installed on the connecting pipe between the first filter and the second filter; the inlet of the second filter is also connected to the discharge port of the auxiliary material tank 15 through a metering pump; the metering pump, sight glass monitor 14, mixing tank 1, dilute hydrochloric acid tank 11, OCA tank 12, formaldehyde tank 13, microreactor 2, pipeline reactor 3, continuous neutralization device 4, continuous water washing device 5, temporary storage tank 6, first filter 7, auxiliary material tank 15, second filter 8, dehydrator 9 and mixing kettle 10 are all electrically connected to the DCS automatic control system (not shown).

[0025] In actual production, OCA (o-chloroaniline) is first mixed evenly with dilute hydrochloric acid in mixing tank 1, and then fed into microreactor 2 along with formaldehyde. Condensation is carried out at 50-60℃ and pH 4-5 for 2-3 minutes. Then, it enters pipeline reactor 3 and the reaction is extended to 15 minutes at 90℃. After the reaction, it is sent to continuous neutralization device 4 and neutralized to a weakly alkaline pH value with the addition of 30% NaOH solution. Then, it is washed countercurrently using continuous water washing device 5. The resulting material is temporarily stored in temporary storage tank 6 and then enters the first filter 7 to remove impurities, removing particulate impurities. The material after impurity removal is fed together with or separately from the auxiliary materials (plasticizer, etc.) from auxiliary material tank 15 into the second filter 8 for impurity removal. After dehydration by dehydrator 9, it can enter the mixing tank 10 for mixing. After mixing, liquid MOCA product is obtained.

[0026] It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

Claims

1. A liquid MOCA production apparatus, characterized in that: The system comprises a mixing tank, a microreactor, a pipeline reactor, a continuous neutralization device, a continuous washing device, a temporary storage tank, a first filter, a second filter, a dehydrator, and a mixing vessel, all connected sequentially via pipes and metering pumps. The inlet of the mixing tank is connected to a dilute hydrochloric acid tank and an OCA tank via pipes and metering pumps, respectively. The outlet of the mixing tank is connected to the inlet of the microreactor, which is also connected to the outlet of the formaldehyde tank via pipes and metering pumps. A sight glass monitor is installed on the connecting pipe between the first and second filters. The inlet of the second filter is also connected to the outlet of the auxiliary material tank via a metering pump. The metering pump, sight glass monitor, mixing tank, dilute hydrochloric acid tank, OCA tank, formaldehyde tank, microreactor, pipeline reactor, continuous neutralization device, continuous washing device, temporary storage tank, first filter, auxiliary material tank, second filter, dehydrator, and mixing vessel are all electrically connected to a DCS automatic control system.

2. The liquid MOCA production apparatus according to claim 1, characterized in that: All the metering pumps mentioned are hydraulic diaphragm metering pumps.

3. The liquid MOCA production apparatus according to claim 1, characterized in that: The mixing tank is an enamel-lined reactor, and the mixing vessel is a dual planetary power mixing vessel equipped with a circulation device.

4. The liquid MOCA production apparatus according to claim 1, characterized in that: The microreactor is a microchannel tubular reactor.

5. The liquid MOCA production apparatus according to claim 1, characterized in that: The pipeline reactor is a static mixing type pipeline reactor.

6. The liquid MOCA production apparatus according to claim 1, characterized in that: Both the continuous neutralization device and the continuous washing device are centrifugal extractors.

7. The liquid MOCA production apparatus according to claim 1, characterized in that: The first filter is a pipeline filter cartridge, and the second filter is a precision sintered filter.

8. The liquid MOCA production apparatus according to claim 1, characterized in that: The dehydrator is a scraped rotary thin-film evaporator.

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