CN210237501U

CN210237501U - ECH recovery pipeline in TGIC preparation process

Info

Publication number: CN210237501U
Application number: CN201921276183.4U
Authority: CN
Inventors: Zhisheng Ling; 凌志胜
Original assignee: Huangshan Duobang Chemical Materials Co Ltd
Current assignee: Huangshan Duobang Chemical Materials Co Ltd
Priority date: 2019-08-07
Filing date: 2019-08-07
Publication date: 2020-04-03
Anticipated expiration: 2029-08-07

Abstract

The utility model discloses a recovery pipeline of ECH in TGIC preparation technology, including recovery tube, stills, one-level condenser, second grade condenser, receiving tank and the buffer tank that communicate in proper order, arranged the overflow pond in the buffer tank, the liquid level M1 in overflow pond is invariable, and the feed liquor pipe of buffer tank stretches into below the overflow pond liquid level M1, and the difference in height between receiving tank inlet and the M1 satisfies

Wherein P is₁For caching the air pressure in the tank, P₂Is the air pressure of the receiving tank during the negative pressure distillation,_ρdensity of ECH. Because the receiving tank is in negative pressure, the air pressure P in the buffer tank is balanced based on the pressure of the liquid level M1 of the overflow tank₁And the pressure P in the receiving tank₂Under steady state, the liquid level M2 in the receiving tank is maintained at a value higher than M1

Once liquid enters, the overflow tank can overflow to automatically drain the liquid, so that only one receiving tank is needed, and the control of labor cost and the stable operation of pipelines are facilitated.

Description

ECH recovery pipeline in TGIC preparation process

Technical Field

The utility model relates to an ECH recovery technology, specifically say, in particular to ECH's recovery pipeline among TGIC preparation technology.

Background

Triglycidyl isocyanurate, TGIC for short, is a crystalline heterocyclic epoxy compound and has excellent heat resistance, weather resistance, light resistance, corrosion resistance, chemical resistance and mechanical properties. Currently, the TGIC industry mostly adopts a two-step synthetic route, i.e. the first step is an addition ring-opening reaction, the epoxy ring of Epichlorohydrin (ECH) is easy to open in an acid reagent, the obtained intermediate tris (3-chloro-2-hydroxypropyl) isocyanurate is subjected to ring closure under the action of alkali to form triglycidyl isocyanurate, i.e. TGIC, meanwhile, 1, 3-dichloropropanol in the reaction liquid is also cyclized into Epichlorohydrin (ECH) under the action of alkali, and the recovered Epichlorohydrin (ECH) is refined.

The ECH recovery in the prior TGIC preparation process adopts a negative pressure distillation method, and an ECH recovery pipeline comprises a recovery pipe, a distillation still, a first-stage condenser, a second-stage condenser, a receiving tank and a cache tank which are sequentially communicated. The receiving tank adopts liquid self-weight drainage, so that A, B two receiving tanks which are used alternately are required to be arranged, when one receiving tank needs to drain liquid, the receiving tank needs to be cut out from the negative pressure pipeline, and the other receiving tank needs to be vacuumized and connected into the original negative pressure pipeline; not only a plurality of valves need to be operated manually, but also the labor cost is not controlled; and the requirement on experience is high, which is not beneficial to the stable operation of the negative pressure distillation pipeline.

SUMMERY OF THE UTILITY MODEL

To the defect among the prior art, the utility model provides a ECH's recovery pipeline in new TGIC preparation technology adopts the liquid seal flowing back, avoids two receiving tank to switch the flowing back to do benefit to the steady operation of labour cost control and pipeline.

The above technical purpose of the present invention can be achieved by the following technical solutions: an ECH recovery pipeline in a TGIC preparation process comprises a recovery pipe, a distillation still, a first-stage condenser, a second-stage condenser, a receiving tank and a buffer tank which are sequentially communicated, wherein the buffer tank is internally provided with an ECH recovery pipelineAn overflow pool is arranged, the liquid level M1 of the overflow pool is constant, a liquid inlet pipe of the buffer tank extends below the liquid level M1 of the overflow pool, and the height difference between the liquid inlet of the receiving tank and the liquid level M1 meets the requirement

Wherein P is₁For caching the air pressure in the tank, P₂The pressure of the receiving tank in the negative pressure distillation is shown, and rho is the density of ECH.

In actual use, due to the negative pressure in the receiving tank, P is satisfied between the overflow tank liquid level M1 and the receiving tank liquid level M2 based on the pressure balance of the overflow tank liquid level M1₁＝P₂+ ρ gH ', where H' is the height difference between the liquid level M2 in the receiving tank and the overflow sump liquid level M1; thus, the pressure P in the buffer tank₁And the pressure P in the receiving tank₂Under stable circumstances, the liquid level in the receiving tank is maintained at M2, in case there is liquid to get into, can carry out the overflow by the overflow pond from the flowing back to utilize the liquid seal to carry out automatic flowing back, only need set up a receiving tank, be favorable to the control of labour cost and the steady operation of pipeline.

And a partition plate is arranged in the buffer tank so as to separate an overflow pool. The buffer tank has simple structure and easy production.

A first liquid seal pipe is connected to an outlet of the receiving tank, the first liquid seal pipe comprises a U-shaped section and an n-shaped section which are sequentially communicated, the top of the n-shaped section of the first liquid seal pipe is higher than the bottom of the receiving tank, and the height difference between the top of the n-shaped section of the first liquid seal pipe and the liquid level M1 of the overflow tank

Arrange first liquid seal pipe like this to design the position at first liquid seal pipe "n" shape section top, make the liquid level M2 in the receiving tank flush with the top of first liquid seal pipe "n" shape section, be favorable to guaranteeing that liquid level M2 is located in the receiving tank so that observe all the time, be convenient for in time discover the pipeline trouble.

And an exhaust valve is arranged at the top of the n-shaped section of the first liquid seal pipe. At the beginning of operation, the gas in the pipeline is conveniently discharged by using the emptying valve.

And a second liquid seal pipe is arranged between the outlet of the secondary condenser and the inlet of the receiving tank, and the second liquid seal pipe also comprises a U-shaped section and an n-shaped section which are sequentially communicated. The gas in the condenser can be effectively prevented from entering the subsequent pipeline.

Preferably, the primary condenser is a vertical condenser, and the secondary condenser is a horizontal condenser.

The recovery pipe is connected with at least two stills in parallel, and each stills is communicated with a first-stage condenser, a second liquid seal pipe, a receiving tank and a first liquid seal pipe in sequence to form a plurality of parallel pipelines, and the pipelines share a cache tank. Thus, a plurality of parallel pipelines are arranged, and the recovery efficiency of the ECH is improved.

Has the advantages that: the utility model discloses a set up the overflow pond in the buffer tank to highly designing receiving tank liquid level and buffer tank overflow pond liquid level, stretch into below the overflow pond liquid level with the feed liquor pipe of buffer tank, thereby provide a liquid seal from ECH's recovery pipeline in the TGIC preparation technology of flowing back, have characteristics such as convenient to use, operation stability, recovery efficiency height.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.

Fig. 1 is a schematic structural diagram of an embodiment of the present invention.

Reference numerals: the system comprises a recovery pipe 1, a distillation still 2, a primary condenser 3, a secondary condenser 4, a second liquid seal pipe 5, a receiving tank 6, a first liquid seal pipe 7, a buffer tank 8, an overflow pool 811, a partition plate 8a and an exhaust valve 9.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.

It is to be noted that unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the present invention belongs.

As shown in fig. 1, this embodiment provides a recovery pipeline of ECH in TGIC preparation process, which includes a recovery pipe 1, a distillation still 2, a primary condenser 3, a secondary condenser 4, a receiving tank 6 and a buffer tank 8, which are sequentially communicated with each other through pipelines. An overflow tank 811 is disposed in the buffer tank 8, the structure of the overflow tank 811 is not limited, and for convenience of production, it is preferable that a partition plate 8a is disposed in the buffer tank 8 to separate the overflow tank 811. In actual use, the liquid level M1 of the overflow tank 811 is constant on the top surface of the overflow tank 811, and the liquid inlet pipe of the buffer tank 8 extends below the liquid level M1 of the overflow tank 811.

In actual use, because the receiving tank 6 is under negative pressure, the pressure balance between the liquid level M1 in the overflow tank 811 and the liquid level M1 in the overflow tank 811 and the liquid level M2 in the receiving tank 6 only needs to satisfy P₁＝P₂+ ρ gH', (where P is₁For the air pressure, P, in the buffer tank 8₂The air pressure of the receiving tank 6 during negative pressure distillation, rho is the density of ECH, and H' is the height difference between the liquid level M2 in the receiving tank 6 and the liquid level M1 in the overflow tank 811) to realize liquid seal automatic liquid drainage, and when the liquid level in the receiving tank 6 is higher than M2, the liquid level in the receiving tank 6 is kept at M2 all the time by the overflow tank 811. Therefore, in order to ensure that M2 is located below the inlet of the receiving tank 6, the height difference between the inlet of the receiving tank 6 and M1 should be such that

And, in order to avoid M2 from falling below the outlet of the receiving tank 6, a first liquid seal pipe 7 is connected to the outlet of the receiving tank 6, the first liquid seal pipe 7 comprises a U-shaped section and an n-shaped section which are communicated in sequence, the top of the n-shaped section of the first liquid seal pipe 7 is higher than the bottom of the receiving tank 6, and the first liquid seal pipe 7 is higher than the bottom of the receiving tank 6The height difference between the top of the n-shaped section of the sealing pipe 7 and the liquid level M1 of the overflow pool 811

Through calculation, in the embodiment, preferably, the top of the n-shaped section of the first liquid seal pipe 7 is higher than the bottom H of the receiving tank 6 by more than 0.6m, and the top of the n-shaped section of the first liquid seal pipe 7 is higher than the liquid level H of the overflow pool 811₂Not less than 10 m. An exhaust valve 9 is installed on the top of the n-shaped section of the first liquid seal pipe 7 so as to exhaust air.

As shown in fig. 1, a second liquid-sealed pipe 5 is arranged between the outlet of the secondary condenser 4 and the inlet of the receiving tank 6, and the second liquid-sealed pipe 5 also includes a "U" section and an "n" section which are communicated in sequence. The first-stage condenser 3 adopts a vertical condenser, and the second-stage condenser 4 adopts a horizontal condenser.

As shown in fig. 1, at least two stills 2 are connected in parallel to the recovery pipe 1, each stills 2 is sequentially connected with a first-stage condenser 3, a second-stage condenser 4, a second liquid-sealed pipe 5, a receiving tank 6 and a first liquid-sealed pipe 7 to form a plurality of parallel pipelines, and the plurality of pipelines share a buffer tank 8. The number of the parallel pipelines is not limited and can be set according to the actual production condition.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the scope of the embodiments of the present invention, and are intended to be covered by the claims and the specification.

Claims

1. The utility model provides a recovery pipeline of ECH in TGIC preparation technology, includes recovery tube, stills, one-level condenser, second grade condenser, receiving tank and the buffer tank that communicates in proper order, characterized by:an overflow tank is arranged in the buffer tank, the liquid level M1 of the overflow tank is constant, a liquid inlet pipe of the buffer tank extends below the liquid level M1 of the overflow tank, and the height difference between the liquid inlet of the receiving tank and the liquid level M1 meets the requirement

2. The ECH recovery pipeline in TGIC manufacturing process of claim 1, wherein: and a partition plate is arranged in the buffer tank so as to separate an overflow pool.

3. The ECH recovery line in TGIC manufacturing process according to claim 1 or 2, wherein: a first liquid seal pipe is connected to an outlet of the receiving tank, the first liquid seal pipe comprises a U-shaped section and an n-shaped section which are sequentially communicated, the top of the n-shaped section of the first liquid seal pipe is higher than the bottom of the receiving tank, and the height difference between the top of the n-shaped section of the first liquid seal pipe and the liquid level M1 of the overflow tank

4. The ECH recovery pipeline in TGIC manufacturing process of claim 3, wherein: and an exhaust valve is arranged at the top of the n-shaped section of the first liquid seal pipe.

5. The ECH recovery pipeline in TGIC manufacturing process of claim 4, wherein: and a second liquid seal pipe is arranged between the outlet of the secondary condenser and the inlet of the receiving tank, and the second liquid seal pipe also comprises a U-shaped section and an n-shaped section which are sequentially communicated.

6. The ECH recovery pipeline in TGIC manufacturing process of claim 5, wherein: the first-stage condenser adopts a vertical condenser, and the second-stage condenser adopts a horizontal condenser.

7. The ECH recovery pipeline in TGIC manufacturing process of claim 6, wherein: the recovery pipe is connected with at least two stills in parallel, and each stills is communicated with a first-stage condenser, a second liquid seal pipe, a receiving tank and a first liquid seal pipe in sequence to form a plurality of parallel pipelines, and the pipelines share a cache tank.