Vacuum chlorine removal system for organosilicon hydrolysate

Abstract

The utility model discloses a vacuum chlorine removal system of organic silicon hydrolyzate, it includes hydrolyzate delivery pipeline, water delivery pipeline, mixer, vacuum dechlorination jar, nitrogen gas delivery pipeline, steam delivery pipeline, condenser, waste acid jar and vacuum pump. Advantageous effect: the utility model discloses simple connection relation, easy implementation make that the removal rate of chlorine in hydrolyzate can reach 99% or above, and then make the final chlorine content of hydrolyzate less than or equal to 0.03%, the chlorine removal efficiency of the utility model is high, and the energy consumption is low, and the product yield is promoted to 98% or above, saves the water resource, reduces the treatment cost of waste water, reduces the cost of using adsorbent, and meets the environmental protection requirement.

Description

Technical Field

[0001] This utility model relates to the field of dechlorination technology for organosilicon hydrolysates, and in particular to a vacuum dechlorination system for organosilicon hydrolysates. Background Technology

[0002] The hydrolysate is a cyclic polysiloxane (Me2SiO) obtained by hydrolyzing dimethyldichlorosilane monomer. n (abbreviated as cyclic) and linear polysiloxanes [HO(Me2SiO] ] n The preparation process of the mixture of H] (abbreviated as linear) is as follows: silicon powder and chloromethane gas react in a fluidized bed reactor in the presence of a copper catalyst to produce a mixed monomer of methylchlorosilane. The mixed methylchlorosilane monomer is separated by distillation to obtain dimethyldichlorosilane and other purified monomers. Dimethyldichlorosilane reacts with water or concentrated hydrochloric acid to generate hydrolysate and concentrated hydrochloric acid or HCl gas. Therefore, the chlorine in the hydrolysate usually comes from raw material residues and hydrolysis reaction byproducts. If the chlorine is not removed, it will affect the stability of the product and subsequent applications. The commonly used chlorine removal methods are: 1. Alkaline neutralization method, which uses alkali (such as NaOH, Na2CO3, ammonia water) to react with free chlorine and HCl produced by hydrolysis to generate water-soluble chloride salts, which are then removed by separation or filtration. However, the above methods introduce excessive sodium ions, requiring multiple water washes and generating a large amount of saline wastewater, increasing the company's wastewater treatment costs and wasting a large amount of water resources; 2. Adsorption method, which uses molecular sieves, activated carbon or activated alumina and other adsorbents in the adsorption column for adsorption, although no wastewater is generated, the capacity of the adsorbent in the adsorption column is limited, and it needs to be replaced or regenerated regularly, which is costly. Utility Model Content

[0003] The main purpose of this invention is to provide a vacuum dechlorination system for organosilicon hydrolysates, which has high dechlorination efficiency, low energy consumption, and a product yield of over 98%, saving water resources, reducing wastewater treatment costs, reducing the cost of using adsorbents, and meeting environmental protection requirements.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a vacuum dechlorination system for organosilicon hydrolysates, comprising a hydrolysate delivery pipeline, a water delivery pipeline, a mixer, a vacuum dechlorination tank, a nitrogen delivery pipeline, a steam delivery pipeline, a condenser, a waste acid tank, and a vacuum pump; the liquid outlet of the hydrolysate delivery pipeline and the water outlet of the water delivery pipeline are both connected to the liquid inlet of the mixer, the liquid outlet of the mixer is connected to the upper inlet of the vacuum dechlorination tank, the gas outlet of the nitrogen delivery pipeline is connected to the lower inlet of the vacuum dechlorination tank, and the gas outlet of the steam delivery pipeline is connected to the nitrogen delivery pipeline; the top gas outlet of the vacuum dechlorination tank is connected to the gas inlet of the condenser, the liquid outlet of the condenser is connected to the waste acid tank through a delivery pipeline, the liquid outlet of the delivery pipeline is located at the bottom inside the waste acid tank, the gas outlet of the condenser is connected to the upper gas inlet of the waste acid tank, and the upper gas outlet of the waste acid tank is connected to the gas inlet of the vacuum pump.

[0005] Furthermore, a first distributor, a packing layer, and a second distributor are arranged sequentially from top to bottom inside the vacuum dechlorination tank; the liquid outlet of the mixer is connected to the liquid inlet of the first distributor, and the gas outlet of the nitrogen delivery pipeline is connected to the gas inlet of the second distributor.

[0006] Furthermore, both the first distributor and the second distributor are tubular distributors.

[0007] Furthermore, it also includes a settling tank, wherein the bottom outlet of the vacuum dechlorination tank is connected to the inlet of the settling tank.

[0008] Furthermore, the packing material within the packing layer is a Pall ring.

[0009] This utility model has the following beneficial effects:

[0010] 1. This utility model has a simple connection relationship and is easy to implement. Through the triple action of mixing with water, vacuum stripping, and inert gas dispersion, the chlorine removal rate in the hydrolysate can reach over 99%, resulting in a final chlorine content of ≤0.03%. This utility model has high chlorine removal efficiency. Utilizing the waste heat of the hydrolysate and the vacuum environment reduces the stripping temperature, thus reducing energy consumption. Furthermore, the protection of nitrogen effectively inhibits the polymerization of the hydrolysate, increasing the product yield to over 98%.

[0011] 2. This utility model requires less water, resulting in less wastewater treatment, thus saving water resources and reducing wastewater treatment costs. At the same time, it eliminates the need for adsorbents, thereby avoiding the need for regular replacement or regeneration of adsorbents and reducing the cost of using adsorbents. In addition, the removed dilute hydrochloric acid is collected and treated centrally, and after the exhaust gas is condensed, the HCl concentration in the emitted uncondensed gas is ≤5ppm, which meets environmental protection requirements. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the overall structure of a vacuum dechlorination system for organosilicon hydrolysates according to the present invention.

[0014] In the diagram: 1. Hydrolysate delivery pipeline, 2. Water delivery pipeline, 3. Mixer, 4. Vacuum dechlorination tank, 5. Nitrogen delivery pipeline, 6. Steam delivery pipeline, 7. Condenser, 8. Waste acid tank, 9. Vacuum pump, 10. Settling and stratification tank, 11. First distributor, 12. Packing layer, 13. Second distributor, 14. Delivery pipe. Detailed Implementation

[0015] The following is in conjunction with the appendix Figure 1 The principles and features of this utility model are described, making the technical means, creative features, and achieved objectives of this utility model easy to understand, and further elaborating on this utility model.

[0016] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0017] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0018] like Figure 1As shown, the technical solution adopted by this utility model is as follows: a vacuum dechlorination system for organosilicon hydrolysate, comprising a hydrolysate conveying pipeline 1, a water conveying pipeline 2, a mixer 3, a vacuum dechlorination tank 4, a nitrogen conveying pipeline 5, a steam conveying pipeline 6, a condenser 7, a waste acid tank 8, a vacuum pump 9, and a settling and stratification tank 10; the liquid outlet of the hydrolysate conveying pipeline 1 and the water outlet of the water conveying pipeline 2 are both connected to the liquid inlet of the mixer 3, and the liquid outlet of the mixer 3 is connected to the upper inlet of the vacuum dechlorination tank 4. The outlet of nitrogen delivery pipeline 5 is connected to the lower inlet of vacuum dechlorination tank 4, and the outlet of steam delivery pipeline 6 is connected to nitrogen delivery pipeline 5; the top outlet of vacuum dechlorination tank 4 is connected to the inlet of condenser 7, the liquid outlet of condenser 7 is connected to waste acid tank 8 through liquid delivery pipe 14, the liquid outlet of liquid delivery pipe 14 is placed at the bottom inside waste acid tank 8, the outlet of condenser 7 is connected to the upper inlet of waste acid tank 8, and the upper outlet of waste acid tank 8 is connected to the inlet of vacuum pump 9.

[0019] Inside the vacuum dechlorination tank 4, a first distributor 11, a packing layer 12, and a second distributor 13 are arranged sequentially from top to bottom. The outlet of the mixer 3 is connected to the inlet of the first distributor 11, and the outlet of the nitrogen delivery pipeline 5 is connected to the inlet of the second distributor 13. Both the first distributor 11 and the second distributor 13 are tubular distributors. The packing in the packing layer 12 is Pall rings. The bottom outlet of the vacuum dechlorination tank 4 is connected to the inlet of the settling and stratification tank 10.

[0020] Working principle: First, the hydrolysate (95℃-100℃) and water (room temperature) are mixed in a mass ratio of 1000:1 in mixer 3, and then enter the first distributor 11 from the top of the vacuum dechlorination tank 4. After mixing with nitrogen gas and water vapor (120℃), the mixture enters the second distributor 13 from the bottom of the vacuum dechlorination tank 4. After being dispersed by the first distributor 11 and the second distributor 13, the two gases come into contact with each other in the packing layer 12. The Pall rings in the packing layer 12 increase the gas-liquid contact area. The two gases collide, and the water vapor moves upward, carrying away chloride ions and water from the hydrolysate. Nitrogen gas is introduced to ensure uniform distribution of water vapor and uniform downward movement of the hydrolysate. The water, hydrogen chloride, and nitrogen gas at the top of the vacuum dechlorination tank 4 are condensed by condenser 7 and enter the bottom of the waste acid tank 8. The acid water is discharged from the bottom of the waste acid tank 8, and the uncondensed gas enters the waste acid tank 8 and is vented by vacuum pump 9. The hydrolysate at the bottom of the vacuum dechlorination tank 4 enters the settling and stratification tank 10 for settling and stratification. The dechlorinated hydrolysate is taken out from the top of the settling and stratification tank 10, and a small amount of water is intermittently discharged from the bottom of the settling and stratification tank 10.

[0021] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A vacuum dechlorination system for organosilicon hydrolysates, characterized in that, It includes a hydrolysate delivery pipeline, a water delivery pipeline, a mixer, a vacuum dechlorination tank, a nitrogen delivery pipeline, a steam delivery pipeline, a condenser, a waste acid tank, and a vacuum pump. The liquid outlet of the hydrolysate delivery pipeline and the water outlet of the water delivery pipeline are both connected to the liquid inlet of the mixer. The liquid outlet of the mixer is connected to the upper inlet of the vacuum dechlorination tank. The gas outlet of the nitrogen delivery pipeline is connected to the lower inlet of the vacuum dechlorination tank. The gas outlet of the steam delivery pipeline is connected to the nitrogen delivery pipeline. The top gas outlet of the vacuum dechlorination tank is connected to the gas inlet of the condenser. The liquid outlet of the condenser is connected to the waste acid tank through a delivery pipeline, with the liquid outlet of the delivery pipeline positioned at the bottom inside the waste acid tank. The gas outlet of the condenser is connected to the upper gas inlet of the waste acid tank. The upper gas outlet of the waste acid tank is connected to the gas inlet of the vacuum pump.

2. The vacuum dechlorination system for organosilicon hydrolysates according to claim 1, characterized in that, Inside the vacuum dechlorination tank, a first distributor, a packing layer, and a second distributor are arranged sequentially from top to bottom; the liquid outlet of the mixer is connected to the liquid inlet of the first distributor, and the gas outlet of the nitrogen delivery pipeline is connected to the gas inlet of the second distributor.

3. The vacuum dechlorination system for organosilicon hydrolysates according to claim 2, characterized in that, Both the first distributor and the second distributor are tubular distributors.

4. A vacuum dechlorination system for organosilicon hydrolysates according to any one of claims 1-3, characterized in that, It also includes a settling tank, wherein the bottom outlet of the vacuum dechlorination tank is connected to the inlet of the settling tank.

5. The vacuum dechlorination system for organosilicon hydrolysates according to claim 2, characterized in that, The packing material in the packing layer is a Pall ring.

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