Cyanated methanol recovery device for p-chlorophenylglycine production line

Abstract

The utility model discloses a cyanided methanol recovery device for a p-chlorophenylglycine production line, which comprises an absorption kettle body, the upper part of the absorption kettle body is communicated with a hydraulic jet absorption discharge pipeline, the top end of the hydraulic jet absorption discharge pipeline is communicated with a Venturi hydraulic jet absorber, and the top end of the Venturi hydraulic jet absorber is communicated with an absorption tower. And the top of the Venturi hydraulic jet absorber is communicated with a first condenser discharge valve through a hydraulic jet absorption feed pipeline. Methanol, ammonia gas and carbon dioxide in the methanol recovery process are absorbed through Venturi hydraulic jet absorption in the first stage, methanol and water in a reaction system are recovered through a condenser through condensation recovery in the second stage, and an absorption circulation cooler and a condensation recovery condenser share one cooler, so that the production efficiency is improved, and the production cost is reduced. The absorption circulation cooler adopts a four-tube-pass cooler, so that the flow rate of liquid in the cooler reaches 0.8 m / s, solid particles separated out of the liquid in the absorption process are prevented from being formed on the wall in the cooler, the condenser is prevented from being blocked, the recovery time is shortened, the efficiency is improved, the cooler does not need to be cleaned, cleaning wastewater is reduced, and the device is more environment-friendly and simple to operate; automatic control is easy, and the manual labor intensity is low.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of p-chlorophenylglycine production, in particular to a cyanation methanol recovery device of p-chlorophenylglycine production line. BACKGROUND

[0002] P-chlorophenylglycine is an important pesticide intermediate, and it is mainly produced by using sodium cyanide, p-chlorobenzaldehyde and solid ammonium bicarbonate as raw materials to react in a methanol system, wherein the solvent methanol in the reaction system needs to be distilled out for condensation recovery after the cyanation reaction step in the production process. SUMMARY

[0003] The utility model discloses a cyanation methanol recovery device of p-chlorophenylglycine production line, which has the advantages of preventing condenser blockage, improving recovery efficiency, reducing production cost, being environmentally friendly and automatic control, and solves the problems of decomposition of excessive ammonium bicarbonate in the reaction material during the recovery process, precipitation of ammonia gas and carbon dioxide as ammonium bicarbonate solid after cooling in the condenser, blockage of the condenser condenser tube by the precipitated solid, influence on the heat exchange effect of the heat exchanger, long recovery time, low production efficiency, and the need for water heating and cleaning after each batch recovery, high labor intensity and large amount of wastewater treatment.

[0004] To achieve the above object, the utility model provides following technical scheme: a kind of p-chlorophenylglycine production line cyanation methanol recovery device, including absorption kettle body, the top of the absorption kettle body is connected with water jet absorption discharge pipeline, the top of the water jet absorption discharge pipeline is connected with venturi water jet absorber, the top of the venturi water jet absorber is connected with first condenser discharge valve by water jet absorption feed line, the right side of the first condenser discharge valve is connected with absorption circulating condenser by connecting pipe, the left side of the venturi water jet absorber is respectively connected with water jet absorber inlet valve and balance valve by water jet absorption intake line, the bottom of the balance valve is connected with the top of the absorption kettle body by connecting pipe, the left side of the water jet absorber inlet valve is connected with reaction methanol recovery gas pipeline, the top of the reaction methanol recovery gas pipeline is respectively connected with first condenser inlet valve, second condenser inlet valve and third condenser inlet valve by reaction methanol condensation recovery intake line, the top of the absorption kettle body is respectively connected with second condenser discharge valve and third condenser discharge valve by condenser discharge pipeline, the top of the absorption kettle body is connected with absorption kettle vent line, the bottom of the absorption kettle body is connected with absorption circulating pump body by absorption circulating pump feed line, the top of the absorption circulating pump body is connected with condenser feed valve by absorption circulating pump discharge pipeline, the right side of the absorption circulating condenser is connected with condenser cooling water inlet valve by connecting pipe, the right side of the condenser cooling water inlet valve is connected with water jet absorption feed line.

[0005] As a preferred scheme, the left side of the absorption kettle body cavity is provided with a temperature detector, and the right side of the absorption kettle body cavity is provided with a liquid level detector.

[0006] As a preferred scheme, the left side of the absorption kettle body is connected with an absorption kettle cooling water inlet valve through a connecting pipe, the left side of the absorption kettle cooling water inlet valve is connected with a circulating water feed pipe, and the left side of the absorption kettle body is connected with a circulating water return pipe.

[0007] As a preferred scheme, the bottom of the first condenser inlet valve, the second condenser inlet valve and the third condenser inlet valve is connected with the top of the absorption circulating condenser through a connecting pipe.

[0008] As a preferred scheme, the top of the second condenser discharge valve and the third condenser discharge valve is connected with the bottom of the absorption circulating condenser through a connecting pipe.

[0009] As a preferred scheme, the left side of the condenser feed valve is connected with the right side of the absorption circulating condenser through a connecting pipe.

[0010] Compared with the prior art, the utility model has the beneficial effects as follows:

[0011] The utility model discloses a first stage sets up the water power jet absorption of Venturi and absorbs the methanol, ammonia gas, carbon dioxide in the methanol recovery process, sets up the condensation recovery of second stage, and the methanol, water in the reaction system is recycled through condenser, absorption circulating cooler and condensation recovery condenser share a cooler, absorption circulating cooler adopts four pipe -pass cooler, makes liquid flow rate reach 0.8m / s in the cooler, prevents the solid particle of liquid separation in the absorption process from being in the cooler and prevents the condenser from blocking, shortens the recovery time, improves the efficiency, and the cooler does not need to clean, reduces the production of cleaning waste water, is more environmental protection, easy operation, easy automatic control, low artificial labor intensity, and the cooler of two stages of water power jet absorption and condensation recovery sets up, does not need to add the cooler, and the equipment investment is less. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 For the methanol recovery device diagram of cyanation reaction process of p-chlorophenyl glycine production line.

[0013] In the drawing: 1, Venturi water power jet absorber, 2, absorption circulating condenser, 3, absorption kettle body, 4, absorption circulating pump body, 5, water power ejector inlet valve, 6, first condenser inlet valve, 7, second condenser inlet valve, 8, third condenser inlet valve, 9, first condenser outlet valve, 10, condenser feed valve, 11, balance valve, 12, condenser cooling water inlet valve, 13, second condenser outlet valve, 14, third condenser outlet valve, 15, absorption kettle cooling water inlet valve, 16, temperature detector, 17, liquid level detector, 18, reaction methanol recovery gas pipeline, 19, reaction methanol condensation recovery inlet pipeline, 20, water power jet absorption inlet pipeline, 21, water power jet absorption outlet pipeline, 22, condenser liquid discharge pipeline, 23, absorption kettle vent pipeline, 24, absorption circulating pump outlet pipeline, 25, absorption circulating pump feed pipeline, 26, water power jet absorption feed pipeline. DETAILED DESCRIPTION

[0014] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0015] Secondly, "one embodiment" or "embodiment" referred to here means that specific features, structures or characteristics can be included in at least one implementation of the utility model. "In one embodiment" does not mean the same embodiment on different places in the specification, nor is it an embodiment that is independent of or selected from other embodiments. Embodiment

[0016] Please refer to Figure 1 As shown in the figure, the utility model provides a kind of p-chlorophenylglycine production line methanol recovery device for cyanation, including absorption kettle body 3, the upper portion of absorption kettle body 3 is communicated with water jet absorption discharge pipeline 21, the top of water jet absorption discharge pipeline 21 is communicated with venturi water jet absorber 1, the top of venturi water jet absorber 1 is communicated with first condenser discharge valve 9 by water jet absorption feed pipeline 26, the right side of first condenser discharge valve 9 is communicated with absorption circulating condenser 2 by connecting pipe, the left side of venturi water jet absorber 1 is respectively communicated with water jet absorber inlet valve 5 and balance valve 11 by water jet absorption inlet pipeline 20, the bottom of balance valve 11 is communicated with the top of absorption kettle body 3 by connecting pipe, the left side of water jet absorber inlet valve 5 is communicated with reaction methanol recovery gas pipeline 18, the top of reaction methanol recovery gas pipeline 18 is respectively communicated with first condenser inlet valve 6, second condenser inlet valve 7 and third condenser inlet valve 8 by reaction methanol condensation recovery inlet pipeline 19, the top of absorption kettle body 3 is respectively communicated with second condenser discharge valve 13 and third condenser discharge valve 14 by condenser liquid discharge pipeline 22, the top of absorption kettle body 3 is communicated with absorption kettle vent pipeline 23, the bottom of absorption kettle body 3 is communicated with absorption circulating pump body 4 by absorption circulating pump feed pipeline 25, the top of absorption circulating pump body 4 is communicated with condenser feed valve 10 by absorption circulating pump discharge pipeline 24, the right side of absorption circulating condenser 2 is communicated with condenser cooling water inlet valve 12 by connecting pipe, the right side of condenser cooling water inlet valve 12 is communicated with water jet absorption feed pipeline 26.

[0017] Through the above technical scheme, the left side of the inner cavity of absorption kettle body 3 is provided with temperature detector 16, the right side of the inner cavity of absorption kettle body 3 is provided with liquid level detector 17, the left side of absorption kettle body 3 is communicated with absorption kettle cooling water inlet valve 15 by connecting pipe, the left side of absorption kettle cooling water inlet valve 15 is communicated with circulating water feed pipe, the left side of absorption kettle body 3 is communicated with circulating water return pipe, the bottom of first condenser inlet valve 6, second condenser inlet valve 7 and third condenser inlet valve 8 is communicated with the top of absorption circulating condenser 2 by connecting pipe, the top of second condenser discharge valve 13 and third condenser discharge valve 14 is communicated with the bottom of absorption circulating condenser 2 by connecting pipe, the left side of condenser feed valve 10 is communicated with the right side of absorption circulating condenser 2 by connecting pipe.

[0018] The working principle of the utility model is: opening the first condenser discharge valve 9, the condenser feed valve 10, the condenser cooling water inlet valve 12 and the absorption kettle cooling water inlet valve 15, closing the second condenser discharge valve 13, the third condenser discharge valve 14, the first condenser air inlet valve 6, the second condenser air inlet valve 7 and the third condenser air inlet valve 8, opening the absorption circulating pump body 4, the absorption liquid is cooled through the absorption circulating condenser 2, the cooled absorption liquid enters the Venturi water jet, the temperature of the absorption liquid is detected through the temperature detector 16, the temperature is adjusted and controlled through the condenser cooling water inlet valve 12, opening the water jet air inlet valve 5 through the Venturi absorption, containing methanol, carbon dioxide, ammonia tail gas enters the Venturi water jet absorption device 1 through the water jet absorption inlet pipeline 20 and is mixed and absorbed with the absorption liquid cooled from the absorption circulating condenser 2, when the liquid level detector 17 in the absorption kettle body 3 reaches the specified liquid level value and the temperature in the cyanation reaction kettle reaches 78 DEG C, the first stage Venturi water jet absorption ends, when condensing and recovering, closing the first condenser discharge valve 9, the condenser feed valve 10 and the water jet air inlet valve 5, stopping the absorption circulating pump body 4, opening the condenser cooling water inlet valve 12, the absorption kettle cooling water inlet valve 15, the second condenser discharge valve 13 and the third condenser discharge valve 14, closing the first condenser air inlet valve 6, the second condenser air inlet valve 7 and the third condenser air inlet valve 8, containing methanol gas enters the absorption circulating condenser 2 through the reaction methanol condensing and recovering inlet pipeline 19 and is condensed and recovered, methanol condensate enters the absorption kettle body 3 through the condenser liquid discharge pipeline 22, the temperature of the absorption liquid is detected through the temperature detector 16 during the methanol condensing and recovering process, the temperature is adjusted and controlled through the condenser cooling water inlet valve 12, when the temperature in the cyanation kettle reaches 98 DEG C, methanol recovery is completed.

[0019] It is important to note that the construction and arrangement of the application shown in the various exemplary embodiments is illustrative only. Although only a few embodiments have been described in detail in this disclosure, those skilled in the art who review the present disclosure will readily appreciate that many modifications are possible (e.g., variations in sizes, dimensions, structures, shapes and proportions of the various elements, values of parameters, mounting arrangements, use of materials, colors, orientations, etc.) without materially departing from the novel teachings and advantages of the subject matter described in the present application. For example, elements shown as integrally formed can be constructed of multiple parts or elements, the position of elements can be reversed or otherwise varied, and the nature or number of elements or positions can be altered or varied. Accordingly, all such modifications are intended to be included within the scope of the present application. The order or sequence of any process or method steps can be varied or re-sequenced without materially affecting the application. Any "means plus function" clauses are intended to cover the structures described herein as performing the recited functionality and not only structural equivalents but also equivalent structures. Other substitutions, modifications, changes, and omissions can be made in the design, operating

[0020] Also, to provide a concise description of the exemplary embodiments, not all features of an actual implementation can be described (i.e., those related to the best mode for carrying out the present application, or those which are apparent).

[0021] Finally, it should be noted that the above-mentioned embodiments are merely used to illustrate the technical solutions of the present application, but not to limit the protection scope of the present application. Although the present application is described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced equivalently without departing from the spirit and scope of the technical solutions of the present application.

Claims

1. A recovery device of cyanide methanol for p-chlorophenylglycine production line, comprising an absorption cauldron body (3), characterized in that: The upper part of the absorption kettle body (3) is communicated with a hydraulic jet absorption discharge pipeline (21), the top end of the hydraulic jet absorption discharge pipeline (21) is communicated with a Venturi hydraulic jet absorber (1), the top of the Venturi hydraulic jet absorber (1) is communicated with a first condenser discharge valve (9) through a hydraulic jet absorption feed pipeline (26), the right side of the first condenser discharge valve (9) is communicated with an absorption circulating condenser (2) through a connecting pipe, the left side of the Venturi hydraulic jet absorber (1) is respectively communicated with a hydraulic jet inlet valve (5) and a balance valve (11) through a hydraulic jet absorption inlet pipeline (20), the bottom of the balance valve (11) is communicated with the top of the absorption kettle body (3) through a connecting pipe, the left side of the hydraulic jet inlet valve (5) is communicated with a reaction methanol recovery gas pipeline (18), the top of the reaction methanol recovery gas pipeline (18) is respectively communicated with a first condenser inlet valve (6), a second condenser inlet valve (7) and a third condenser inlet valve (8) through a reaction methanol condensation recovery inlet pipeline (19), the top of the absorption kettle body (3) is respectively communicated with a second condenser discharge valve (13) and a third condenser discharge valve (14) through a condenser liquid discharge pipeline (22), the top of the absorption kettle body (3) is communicated with an absorption kettle vent pipeline (23), the bottom of the absorption kettle body (3) is communicated with an absorption circulating pump body (4) through an absorption circulating pump feed pipeline (25), the top of the absorption circulating pump body (4) is communicated with a condenser feed valve (10) through an absorption circulating pump discharge pipeline (24), the right side of the absorption circulating condenser (2) is communicated with a condenser cooling water inlet valve (12) through a connecting pipe, and the right side of the condenser cooling water inlet valve (12) is communicated with a hydraulic jet absorption feed pipeline (26).

2. A recovery device for cyanation of methanol in p-chlorophenylglycine production line according to claim 1, characterized in that: The left side of the inner cavity of the absorption kettle body (3) is provided with a temperature detector (16), and the right side of the inner cavity of the absorption kettle body (3) is provided with a liquid level detector (17).

3. A recovery device for cyanation of methanol in p-chlorophenylglycine production line according to claim 1, characterized in that: The left side of the absorption kettle body (3) is communicated with an absorption kettle cooling water inlet valve (15) through a connecting pipe, the left side of the absorption kettle cooling water inlet valve (15) is communicated with a circulating water feed pipe, and the left side of the absorption kettle body (3) is communicated with a circulating water return pipe.

4. A recovery device for cyanation of methanol in p-chlorophenylglycine production line according to claim 1, characterized in that: The bottoms of the first condenser inlet valve (6), the second condenser inlet valve (7) and the third condenser inlet valve (8) are communicated with the top of the absorption circulating condenser (2) through connecting pipes.

5. A recovery device for cyanation of methanol in p-chlorophenylglycine production line according to claim 1, characterized in that: The tops of the second condenser discharge valve (13) and the third condenser discharge valve (14) are communicated with the bottom of the absorption circulating condenser (2) through connecting pipes.

6. A recovery device for cyanation of methanol in p-chlorophenylglycine production line according to claim 1, characterized in that: The left side of the condenser feed valve (10) is communicated with the right side of the absorption circulating condenser (2) through a connecting pipe.

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