CN211245624U - Continuous dehydration device for organic solvent - Google Patents

Abstract

The utility model relates to an organic solvent continuous type dehydrating unit, include: the device comprises a mounting seat, a reactor, a centrifugal pump, an organic solvent storage tank and a finished product storage tank; the method is characterized in that: the reactor is composed of a pipeline reactor, a molecular sieve is filled in the inner cavity of the pipeline reactor, a plurality of pipeline reactors are connected in series to form a pipeline reactor group, and a plurality of pipeline reactors are connected in parallel to form the reactor. The molecular sieve is used for adsorbing water and impurities, the organic solvent is subjected to large-scale purification and refining to obtain a polyurethane-grade solvent, and the pipeline reactor is purged by high-temperature steam and high-temperature hot dry air or nitrogen in sequence to achieve the aim of molecular sieve regeneration, so that the potential safety hazard of fire or explosion caused by the fact that the organic solvent is contacted with a high-temperature environment in the regeneration process is eliminated. The method has the advantages of good safety performance, high processing speed, good regeneration effect, low equipment cost, low maintenance cost and the like.

Description

Continuous dehydration device for organic solvent

Technical Field

The utility model relates to a reactor especially relates to an organic solvent continuous type pipeline reactor. The utility model is suitable for a recovery and refining of the polar solvent that mixes with water at normal atmospheric temperature in the waterborne polyurethane resin field of making.

Background

The hydration of resin production requires the use of a large amount of organic solvent, which cannot be directly discharged and needs to be recycled. For example, in the preparation process of aqueous polyurethane dispersion resin, solvents such as acetone and butanone are needed, especially high-solid aqueous polyurethane dispersion with sulfonate as a chain extender, acetone which is 1.5 to 1.8 times of prepolymer is needed as a diluent in the technical process, and after resin emulsification, acetone is removed by heating in a vacuum state to obtain emulsion completely free of organic solvents. The organic solvent such as acetone after vacuum removal contains a large amount of water, and the polar organic solvent still contains about 2 percent of water and is difficult to remove after being treated by a thin film evaporator of primary distillation because the polar solvent is miscible with water. The organic solvent having such a degree of water content cannot be used continuously for resin synthesis, particularly for polyurethane resin synthesis, and therefore, a large amount of the polar organic solvent is accumulated, leading to an increase in industrial cost and waste.

How to treat the organic solvent used in the industrial production of resin water-based chemicals on a large scale to reach the standard of polyurethane grade and reuse the organic solvent in the production of water-based resins is an important content in industrial application. In the prior art, a packed tower filled with a molecular sieve is used for intermittent treatment so as to remove water from an organic solvent, and the molecular sieve is dried at high temperature by an oven so as to obtain regeneration.

However, in the intermittent purification mode of the aqueous organic solvent, the residual organic solvent contacts air and a high-temperature environment in the regeneration process of the molecular sieve, so that safety accidents such as fire or explosion are easily caused, and the treated molecular sieve has the problems of insufficient moisture removal, poor regeneration effect, long treatment time and the like, so that the molecular sieve is difficult to be widely applied. Meanwhile, the dewatering device in the prior art has high manufacturing cost and high maintenance cost, and is also an important reason that the treatment mode is difficult to popularize in most resin manufacturing plants.

Disclosure of Invention

The utility model discloses to the problem that prior art exists, provide an organic solvent continuous type dewatering device that the security performance is good, the processing speed is fast, regeneration effect is good, equipment cost and maintenance cost are low.

The technical scheme of the utility model includes: the device comprises a mounting seat, a reactor, a centrifugal pump, an organic solvent storage tank and a finished product storage tank, wherein the reactor is mounted on the mounting seat, the outlet of the centrifugal pump is communicated with the inlet of the reactor, the inlet of the centrifugal pump is communicated with the organic solvent storage tank, and the outlet of the reactor is communicated with the finished product storage tank; the method is characterized in that: the reactor consists of a pipeline reactor, a molecular sieve is filled in the inner cavity of the pipeline reactor, a plurality of pipeline reactors are connected in series to form a pipeline reactor group, and a plurality of pipeline reactors are connected in parallel to form a reactor; the pipeline reactors in one pipeline reactor group are vertically arranged, one port of the lower pipeline reactor is a reactor inlet, and one port of the upper pipeline reactor is a reactor outlet; the inlet of the reactor is communicated with a high-temperature blowing device which is formed by connecting a steam boiler and a box-type resistance furnace in parallel; the outlet of the reactor is communicated with the condenser gas-liquid separation device, an outlet distribution valve is arranged between the outlet of the reactor and the condenser gas-liquid separation device as well as the finished product storage tank, the inlet of the outlet distribution valve is communicated with the outlet of the reactor, and the two outlets are respectively communicated with the inlets of the condenser gas-liquid separation device and the finished product storage tank; an inlet distribution valve is arranged between the inlet of the reactor and the centrifugal pump and between the inlet of the reactor and the high-temperature purging device, the outlet of the inlet distribution valve is communicated with the inlet of the reactor, and the two inlets are respectively communicated with the outlet of the centrifugal pump and the high-temperature purging device.

In the technical scheme, flanges are arranged at two ends of the pipeline reactor, and sieve plates are arranged in inner cavities of the flanges.

In the above technical scheme, the molecular sieve has a diameter of 9-10A and a filling rate of 500 g/L.

In the technical scheme, an air pressure valve is arranged between the high-temperature purging device and the inlet distribution valve.

Compared with the prior art, the utility model beneficial effect be: the continuous dehydration device is formed by connecting pipeline reactors filled with molecular sieves in series, the molecular sieves are used for adsorbing water and impurities, the organic solvent is purified and refined on a large scale to reach a polyurethane-grade solvent, the pipeline reactors are sequentially purged through high-temperature steam and high-temperature hot dry air or nitrogen, the aim of regenerating the molecular sieves is fulfilled, two important functions of refining the organic solvent and regenerating the molecular sieves are realized, and the potential safety hazard of fire or explosion caused by the fact that the organic solvent is contacted with a high-temperature environment in the regeneration process is eliminated. The method has the advantages of good safety performance, high processing speed, good regeneration effect, low equipment cost, low maintenance cost and the like.

Drawings

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

In the figure: 1. the device comprises a mounting base, 2, a pipeline reactor, 3, a molecular sieve, 4, a flange, 5, a valve, 6, an outlet distribution valve, 7, a condenser gas-liquid separation device, 8, a discharge pipe, 9, a finished product storage tank, 10, an organic solvent storage tank, 11, a box type resistance furnace, 12, a steam boiler, 13, an inlet distribution valve, 14-, a centrifugal pump, 15 and an air pressure valve.

Detailed Description

The continuous organic solvent dehydrating apparatus shown in fig. 1 comprises: the device comprises a mounting seat 1, a reactor, a centrifugal pump 14, an organic solvent storage tank 10 and a finished product storage tank 9, wherein the reactor is mounted on the mounting seat 1, the outlet of the centrifugal pump 14 is communicated with the inlet of the reactor, the inlet of the centrifugal pump is communicated with the organic solvent storage tank 10, the centrifugal pump 14 inputs the water-containing organic solvent in the organic solvent storage tank 10 into the reactor, and the outlet of the reactor is communicated with the finished product storage tank 9; the method is characterized in that: the reactor consists of a pipeline reactor 2, a molecular sieve 3 is filled in the inner cavity of the pipeline reactor 2, a plurality of pipeline reactors 2 are connected in series to form a pipeline reactor group, and a plurality of pipeline reactors are connected in parallel to form a reactor; the pipeline reactors 2 in one pipeline reactor group are vertically arranged, one port of the pipeline reactor 2 at the lower end is a reactor inlet, one port of the pipeline reactor 2 at the upper end is a reactor outlet, fluid in the pipeline reactor group flows from low to high, and the fluid speed depends on the working pressure of the centrifugal pump 14, the height of the pipeline reactor group and the filling rate of the molecular sieve 3; high-temperature blowing communicated with inlet of reactorThe device comprises a steam boiler 12 and a box-type resistance furnace 11 which are connected in parallel, wherein the steam boiler 12 provides high-temperature steam which fully sweeps out the organic solvent remained in the pipeline reactor 2 so as to prevent the danger of fire or explosion, and the box-type resistance furnace 11 provides 230-260-⁰C, dry hot air or nitrogen is used for purging and regenerating the molecular sieve 3 after the organic solvent is removed; the outlet of the reactor is communicated with a condenser gas-liquid separation device 7, an outlet distribution valve 6 is arranged between the outlet of the reactor and the condenser gas-liquid separation device 7 and a finished product storage tank 9, the inlet of the outlet distribution valve 6 is communicated with the outlet of the reactor, two outlets are respectively communicated with the inlets of a condenser gas-liquid separation device 7 and a finished product storage tank 9, the refined organic solvent overflows into the finished product storage tank 9 by the outlet distribution valve 6, high-temperature steam and high-temperature dry air or nitrogen for regeneration treatment of the molecular sieve 3 flow into the condenser gas-liquid separation device 7, gas-liquid separation and cooling are carried out by the condenser gas-liquid separation device 7, the liquid contains a small amount of organic solvent, the liquid is intensively treated by a discharge pipe 8 to a wastewater collection tank, the waste gas is discharged to a waste gas treatment tower by a discharge pipe 8, the organic solvent in the treatment process is completely isolated from the outside, and potential safety hazards such as fire or explosion are avoided; an inlet distribution valve 13 is arranged between the inlet of the reactor and the centrifugal pump 14 and the high-temperature purging device, the outlet of the inlet distribution valve 13 is communicated with the inlet of the reactor, the two inlets are respectively communicated with the outlet of the centrifugal pump 14 and the high-temperature purging device, and the inlet of the reactor is controlled to be respectively communicated with the centrifugal pump 14 or the high-temperature purging device.

The two ends of the pipeline reactor 2 are provided with flanges 4, the inner cavity of each flange 4 is provided with a sieve plate, and the sieve plates can prevent the molecular sieve 3 from being accumulated or displaced in a large range under the flowing states of liquid fluid, steam or air and the like.

The diameter of the molecular sieve 3 is 9-10A, and the filling rate is 500 g/L. The diameter of the molecular sieve 3 is far larger than that of water molecules, the static adsorption rate reaches 25%, the treatment slope is fast, the large-scale requirement of rapid continuous treatment is met, and meanwhile, a small amount of high-boiling-point solvent possibly contained in the organic solvent is also adsorbed and removed together, so that the aim of obtaining the polyurethane-grade solvent is fulfilled.

An air pressure valve 15 is arranged between the high-temperature blowing device and the inlet distribution valve 13, the outlet of the air pressure valve 15 is communicated with one inlet of the inlet distribution valve 13, two outlets are respectively communicated with the steam boiler 12 and the box-type resistance furnace 11, the steam boiler 12 and the box-type resistance furnace 11 are controlled to be communicated with the pipeline reactor 2, the high-temperature steam is firstly conveyed to blow the pipeline reactor 2, and then high-temperature dry air or nitrogen is conveyed to regenerate the molecular sieve after water absorption.

The pipeline reactor 2 is composed of stainless steel round pipes or square pipes, the pipe diameter of the pipeline is 5cm-15cm, the length of a single pipeline is 5m, and the pipelines are connected with each other through a flange 4.

Claims (5)

1. A continuous dehydration device for organic solvent comprises a mounting seat (1), a reactor, a centrifugal pump (14), an organic solvent storage tank (10) and a finished product storage tank (9), wherein the reactor is mounted on the mounting seat (1), the outlet of the centrifugal pump (14) is communicated with the inlet of the reactor, the inlet of the centrifugal pump is communicated with the organic solvent storage tank (10), and the outlet of the reactor is communicated with the finished product storage tank (9); the method is characterized in that: the reactor consists of a pipeline reactor (2), the inner cavity of the pipeline reactor (2) is filled with a molecular sieve (3), a plurality of pipeline reactors (2) are connected in series to form a pipeline reactor group, and a plurality of pipeline reactors are connected in parallel to form a reactor; the pipeline reactors (2) in one pipeline reactor group are vertically arranged, one port of the lower pipeline reactor (2) is a reactor inlet, and one port of the upper pipeline reactor (2) is a reactor outlet; the inlet of the reactor is communicated with a high-temperature blowing device which is formed by connecting a steam boiler (12) and a box-type resistance furnace (11) in parallel; the outlet of the reactor is communicated with a condenser gas-liquid separation device (7), an outlet distribution valve (6) is arranged between the outlet of the reactor and the condenser gas-liquid separation device (7) and a finished product storage tank (9), the inlet of the outlet distribution valve (6) is communicated with the outlet of the reactor, and the two outlets are respectively communicated with the inlets of the condenser gas-liquid separation device (7) and the finished product storage tank (9); an inlet distribution valve (13) is arranged between the inlet of the reactor and the centrifugal pump (14) and the high-temperature purging device, the outlet of the inlet distribution valve (13) is communicated with the inlet of the reactor, and the two inlets are respectively communicated with the outlet of the centrifugal pump (14) and the high-temperature purging device.

2. The continuous dehydration apparatus for organic solvent according to claim 1, wherein: flanges (4) are arranged at two ends of the pipeline reactor (2), and sieve plates are arranged in the inner cavities of the flanges (4).

3. The continuous organic solvent dehydrating apparatus of claim 1 or 2, wherein: the diameter of the molecular sieve (3) is 9-10A, and the filling rate is 500 g/L.

4. The continuous organic solvent dehydrating apparatus of claim 1 or 2, wherein: an air pressure valve (15) is arranged between the high-temperature purging device and the inlet distribution valve (13), the outlet of the air pressure valve (15) is communicated with one inlet of the inlet distribution valve (13), and the two outlets are respectively communicated with the steam boiler (12) and the box type resistance furnace (11).

5. The continuous dehydration apparatus for organic solvent according to claim 3, characterized in that: an air pressure valve (15) is arranged between the high-temperature purging device and the inlet distribution valve (13), the outlet of the air pressure valve (15) is communicated with one inlet of the inlet distribution valve (13), and the two outlets are respectively communicated with the steam boiler (12) and the box type resistance furnace (11).

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