Concentrator for producing 3, 4-dihydroxy-1-butene

Abstract

The utility model discloses a concentrator for producing 3, 4-dihydroxy-1-butene, which comprises an evaporating tank, an MVR (mechanical vapor recompression) heat pump, a heat exchanger, a circulating pump, a steam-water separator and a solid-phase extraction column, according to the utility model, the structure of the MVR evaporator is improved aiming at the characteristics of 3, 4-dihydroxy-1-butene, and all secondary steam can be changed into a reusable steam source by using a small amount of mechanical energy, so that the evaporation process is continuously carried out without depending on external steam. A steam-water separator is connected in series on an exhaust pipe, non-condensable gas is separated from condensate water, and then 3, 4-dihydroxy-1-butene contained in the condensate water is cut off and separated through a solid-phase extraction column, so that the purposes of purifying water and recovering the 3, 4-dihydroxy-1-butene are achieved.

Description

Technical Field

[0001] The utility model relates to a concentrator, in particular to a concentrator used for producing 3,4-dihydroxy-1-butene. Background Art

[0002] 3,4-Dihydroxy-1-butene is a pesticide and pharmaceutical intermediate that is easily soluble in water. During the synthesis process, an aqueous solution is required as a medium for reaction, so the synthesized product contains a large amount of water. Since it is easily soluble in water, it is difficult to separate it by liquid phase extraction. Generally, heating evaporation and concentration are used to remove the water.

[0003] Currently, single-effect or multi-effect concentrators are used for evaporation concentration. The boiling point of 3,4-dihydroxy-1-butene is 195 degrees Celsius, while the boiling point of water is 100 degrees Celsius. Evaporation concentration is a very effective method, but some of it will still evaporate. 3,4-dihydroxy-1-butene is a toxic substance. The mixed condensed water cannot be used for other purposes and needs to be treated separately. The final steam still needs condensed water for condensation, and most of the latent heat is not recovered. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a concentrator for producing 3,4-dihydroxy-1-butene, so as to solve the technical problems in the above-mentioned background technology.

[0005] In order to solve the above technical problems, the technical solution of the utility model is:

[0006] A concentrator for producing 3,4-dihydroxy-1-butene comprises an evaporator, an MVR heat pump, a heat exchanger, a circulation pump, a steam-water separator and a solid phase extraction column; a steam outlet is arranged on the top side of the evaporator, a circulation inlet and a circulation outlet are arranged on the peripheral wall of the evaporator, and a concentrated liquid discharge port is arranged at the bottom; the steam outlet is connected to the inlet of the MVR heat pump through an air delivery pipe A, and the air delivery pipe A is connected with a preheating steam pipe before the inlet of the MVR heat pump; the outlet of the MVR heat pump is connected to the top air inlet of the heat exchanger through an air delivery pipe B, the bottom exhaust port of the heat exchanger is connected with an exhaust pipe with a diameter smaller than that of the air delivery pipe B, a steam-water separator is connected in series on the exhaust pipe, and a solid phase extraction column is connected to the outlet of the steam-water separator; the circulation outlet is connected to the water inlet of the heat exchanger through a circulation pipe A, a circulation pump is connected in series on the circulation pipe A, and the water outlet of the heat exchanger is connected to the circulation inlet through a circulation pipe B.

[0007] Furthermore, the circulation pipe A is connected to a filling pipe before the inlet of the circulation pump.

[0008] Furthermore, the evaporation tank includes an evaporation chamber and a storage chamber. The diameter of the evaporation chamber is larger than that of the storage chamber. A drainage pipe extends from the bottom of the evaporation chamber to the lower part of the storage chamber, and the circulation outlet is located at the upper part of the storage chamber.

[0009] Furthermore, a spray filler is installed at the lower part of the evaporation chamber, a grid demister is installed at the upper part, the steam outlet is located above the grid demister, and the circulation inlet is located at the lower side of the grid demister.

[0010] Furthermore, the outlet of the circulation pipe B extends to the center of the evaporation chamber and then bends downward, a nozzle is installed in front of the outlet, and a diffusion cover is installed at the outlet of the drainage pipe.

[0011] Advantages of the utility model:

[0012] The utility model improves the structure of the MVR evaporator according to the characteristics of 3,4-dihydroxy-1-butene, and only uses a small amount of mechanical energy to convert all secondary steam into a reusable steam source, so that the evaporation process can continue, and a steam-water separator is connected in series on the exhaust pipe to separate non-condensable gas from condensed water, and then the 3,4-dihydroxy-1-butene contained in the condensed water is intercepted and separated by a solid phase extraction column, so as to achieve the purpose of purifying water and recovering 3,4-dihydroxy-1-butene. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a three-dimensional schematic diagram of the utility model;

[0014] Figure 2 This is a cross-sectional view of the evaporator.

[0015] In the figure, 1-evaporation tank, 11-evaporation chamber, 111-steam outlet, 112-circulation inlet, 113-spray filler, 114-grid demister, 115-drainage pipe, 116-diffusion cover, 12-storage chamber, 121-circulation outlet, 122-concentrate discharge port, 2-MVR heat pump, 21-gas pipe A, 22-preheating steam pipe, 3-heat exchanger, 31-circulation pipe A, 311-filling pipe, 32-circulation pipe B, 321-nozzle, 33-gas pipe B, 34-exhaust pipe, 4-circulation pump, 5-steam separator, 6-solid phase extraction column. DETAILED DESCRIPTION

[0016] The specific implementation methods of the present invention are further described below in conjunction with the accompanying drawings. It should be noted that the description of these implementation methods is used to help understand the present invention, but does not constitute a limitation of the present invention. In addition, the technical features involved in each implementation method of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0017] As shown in the figure:

[0018] A concentrator for producing 3,4-dihydroxy-1-butene, comprising an evaporator 1, an MVR heat pump 2, a heat exchanger 3, a circulating pump 4, a steam-water separator 5 and a solid phase extraction column 6; a steam outlet 111 is arranged on the top side of the evaporator 1, a circulating inlet 112 and a circulating outlet 121 are arranged on the peripheral wall of the evaporator 1, and a concentrated liquid discharge port 122 is arranged at the bottom; the steam outlet 111 is connected to the inlet of the MVR heat pump 2 through a gas pipeline A21, and the gas pipeline A21 is connected to a preheating device before the inlet of the MVR heat pump 2 Steam pipe 22; the outlet of the MVR heat pump 2 is connected to the top air inlet of the heat exchanger 3 through the air pipe B3433, the bottom exhaust port of the heat exchanger 3 is connected to an exhaust pipe with a diameter smaller than that of the air pipe B3433, a steam-water separator 5 is connected in series to the exhaust pipe, and a solid phase extraction column 6 is connected to the outlet of the steam-water separator 5; the circulation outlet 121 is connected to the water inlet of the heat exchanger 3 through the circulation pipe A31, a circulation pump 4 is connected in series to the circulation pipe A31, and the water outlet of the heat exchanger 3 is connected to the circulation inlet 112 through the circulation pipe B32.

[0019] Working principle: The utility model has made improvements on the structure of the MVR evaporator in view of the characteristics of 3,4-dihydroxy-1-butene. The MVR evaporator is based on single-effect evaporation. The low-pressure and low-temperature secondary steam evaporated from the evaporation chamber 11 is compressed by the MVR heat pump 2 into higher-pressure and higher-temperature steam and sent back to the heating chamber for heat exchange with the concentrated liquid. The compressed higher-temperature and higher-pressure secondary steam is condensed by the concentrated liquid and becomes condensed water and discharged. At the same time, the concentrated liquid is heated by the compressed secondary steam to continue evaporation. In this way, only a small amount of mechanical energy is used to convert all the secondary steam into a reusable steam source, so that the evaporation process can continue without relying on external steam. In order to reach the evaporation temperature, the concentrated liquid needs to be preheated with a small amount of external steam (external steam is injected from the preheating steam pipe 22).

[0020] The MVR evaporator no longer requires steam during the evaporation process and only consumes a small amount of electricity. For every 1000kg of water evaporated, only 20 to 30 degrees of electricity are consumed, and no cooling water or vacuum pump is required.

[0021] Although the boiling point of 3,4-dihydroxy-1-butene is 195 degrees Celsius (under standard atmospheric pressure), a small amount of 3,4-dihydroxy-1-butene will still evaporate when the boiling point of water reaches 100 degrees Celsius, so the condensed water finally discharged will still contain a small amount of 3,4-dihydroxy-1-butene. If it is discharged directly, part of the water cannot be used for other purposes, and part of the product is also wasted. Therefore, the utility model connects a steam-water separator 5 in series on the exhaust pipe to separate the non-condensable gas from the condensed water (3,4-dihydroxy-1-butene has a high boiling point, so it will all be gathered in the condensed water), and then the 3,4-dihydroxy-1-butene contained in the condensed water is intercepted and separated by a solid phase extraction column 6 to achieve the purpose of purifying water and recovering 3,4-dihydroxy-1-butene.

[0022] In order to conveniently fill the evaporation tank 1 with the aqueous solution of 3,4-dihydroxy-1-butene, a filling pipe 311 is connected to the circulation pipe A31 before the inlet of the circulation pump 4 .

[0023] As an optimized solution, the evaporator 1 includes an evaporation chamber 11 and a storage chamber 12. The diameter of the evaporation chamber 11 is larger than that of the storage chamber 12. The bottom of the evaporation chamber 11 is extended to the lower part of the storage chamber 12 through a drainage pipe 115. The circulation outlet 121 is located at the upper part of the storage chamber 12. In this way, the evaporator 1 can be divided into a high-temperature area and a low-temperature area to avoid rapid mixing of the heated medicine with the low-temperature medicine, thereby maintaining efficient evaporation capacity. As a further improvement, a spray filler 113 is installed at the lower part of the evaporation chamber 11, and a grid demister 114 is installed at the upper part. The steam outlet 111 is located above the grid demister 114, and the circulation inlet 112 is located at the lower side of the grid demister 114. The spray filler 113 can increase the air time of the high-temperature medicine and disperse the medicine, thereby improving the evaporation capacity, and the resulting foam is removed by the grid demister 114.

[0024] In order to accelerate the dispersion of the medicine during circulation, the outlet of the circulation pipe B32 extends to the center of the evaporation chamber and then bends downward. A nozzle 321 is installed in front of the outlet, and a diffusion cover 116 is installed at the outlet of the drainage pipe 115.

[0025] The above is a detailed description of the embodiments of the present invention in conjunction with the accompanying drawings, but the present invention is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions and variations of these embodiments are made without departing from the principles and spirit of the present invention, and still fall within the scope of protection of the present invention.

Claims

1. A concentrator for producing 3,4-dihydroxy-1-butene, characterized in that: It includes an evaporator, an MVR heat pump, a heat exchanger, a circulation pump, a steam-water separator and a solid phase extraction column; a steam outlet is arranged on the top side of the evaporator, a circulation inlet and a circulation outlet are arranged on the peripheral wall of the evaporator, and a concentrated liquid discharge port is arranged at the bottom; the steam outlet is connected to the inlet of the MVR heat pump through an air pipe A, and the air pipe A is connected to a preheating steam pipe before the inlet of the MVR heat pump; the outlet of the MVR heat pump is connected to the top air inlet of the heat exchanger through an air pipe B, the bottom exhaust port of the heat exchanger is connected to an exhaust pipe with a diameter smaller than that of the air pipe B, a steam-water separator is connected in series on the exhaust pipe, and a solid phase extraction column is connected to the outlet of the steam-water separator; the circulation outlet is connected to the water inlet of the heat exchanger through a circulation pipe A, a circulation pump is connected in series on the circulation pipe A, and the water outlet of the heat exchanger is connected to the circulation inlet through a circulation pipe B.

2. The concentrator for producing 3,4-dihydroxy-1-butene according to claim 1, characterized in that: The circulation pipe A is connected to a filling pipe before the inlet of the circulation pump.

3. The concentrator for producing 3,4-dihydroxy-1-butene according to claim 1, characterized in that: The evaporation tank comprises an evaporation chamber and a storage chamber. The diameter of the evaporation chamber is larger than that of the storage chamber. A drainage pipe extends from the bottom of the evaporation chamber to the lower part of the storage chamber, and a circulation outlet is located at the upper part of the storage chamber.

4. The concentrator for producing 3,4-dihydroxy-1-butene according to claim 3, characterized in that: A spray filler is installed at the lower part of the evaporation chamber, and a grid demister is installed at the upper part. The steam outlet is located above the grid demister, and the circulation inlet is located at the lower side of the grid demister.

5. The concentrator for producing 3,4-dihydroxy-1-butene according to claim 4, characterized in that: The outlet of the circulation pipe B extends to the center of the evaporation chamber and then bends downward. A nozzle is installed in front of the outlet, and a diffusion cover is installed at the outlet of the drainage pipe.

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