Polyethylene glycol recovery device

Abstract

The utility model relates to the technical field of polyethylene glycol recovery, and discloses a polyethylene glycol recovery device. The utility model relates to a polyethylene glycol recovery device which is formed by sequentially connecting a pretreatment unit, a rectification unit, a removal unit and a post-treatment unit in series. The polyethylene glycol recovery device provided by the utility model can be used for recovering polyethylene glycol containing water and organic matters, the separation and purification efficiency is higher, the production cost is reduced, and the environmental protection requirement is met.

Description

Technical Field

[0001] The utility model relates to the technical field of polyethylene glycol recovery, in particular to a polyethylene glycol recovery device. Background Art

[0002] Polyethylene glycol is a high molecular polymer that is non-irritating, slightly bitter, has good water solubility, good compatibility with a variety of organic substances, and has excellent lubricity, moisturizing, dispersibility, and adhesion. Therefore, polyethylene glycol is widely used in cosmetics, pharmaceuticals, chemical fibers, rubber, plastics, papermaking, paints, electroplating, pesticides, metal processing, and food processing.

[0003] In the existing polyethylene glycol linker synthesis process, some polyethylene glycol containing water and other organic matter will be produced. If this part of polyethylene glycol is directly scrapped, it will not only easily cause a large amount of polyethylene glycol waste, but also cause environmental pollution. Based on this, in order to reduce production costs and meet environmental protection requirements, it is urgent to remove impurities and recycle the polyethylene glycol containing water and other organic matter.

[0004] Distillation and rectification are common industrial methods for recovering polyethylene glycol (PEG). However, practical applications have shown that the separation and purification efficiency of distillation and rectification is not good for PEG containing water and other organic matter, and the recovered product often still contains water and organic matter. Therefore, in order to improve separation efficiency, reduce production costs and meet environmental protection requirements, technical personnel in this field urgently need a PEG recovery device for PEG containing water and other organic matter. Utility Model Content

[0005] The purpose of the utility model is to provide a polyethylene glycol recovery device, which can recover polyethylene glycol containing water and organic matter, has high separation and purification efficiency, reduces production costs and meets environmental protection requirements.

[0006] To achieve the above objectives, the present invention provides the following technical solutions:

[0007] A polyethylene glycol recovery device is composed of a pretreatment unit 1, a distillation unit 2, a removal unit 3 and a post-treatment unit 4 connected in series.

[0008] Furthermore, the pre-processing unit 1 includes:

[0009] A sedimentation tank 101 is provided with a waste liquid input pipeline 102 at the top of the sedimentation tank 101 for enriching the polyethylene glycol waste liquid and performing sedimentation treatment to remove insoluble impurities in the polyethylene glycol waste liquid; the bottom of the sedimentation tank 101 is connected to a filter 103;

[0010] A filter 103, wherein the top of the filter 103 is connected to the sedimentation tank 101 and an activated carbon adsorption layer 104 and a quartz sand adsorption layer 105 are sequentially arranged longitudinally to adsorb and filter organic matter in the polyethylene glycol waste liquid; the bottom of the filter 103 is connected to the distillation feed liquid storage tank 106;

[0011] The distillation feed liquid storage tank 106 has one end connected to the filter 103 to enrich and remove the polyethylene glycol waste liquid of insoluble impurities and organic matter; the other end of the distillation feed liquid storage tank 106 is connected to the distillation unit 2.

[0012] Furthermore, the distillation unit 2 comprises:

[0013] A plate tower 201 is provided with a feed pipe 202 in the middle of the plate tower 201, which is connected to the distillation feed liquid storage tank 106 in the pretreatment unit 1 to realize the feeding of polyethylene glycol waste liquid; the top of the plate tower 201 is connected to the condenser 203 to condense the overhead product; the upper end of the side of the plate tower 201 is connected to the reflux tank 204 to reflux the overhead product condensate; the bottom of the plate tower 201 and the lower end of the side of the plate tower 201 are connected to the reboiler 205 to vaporize the bottom product;

[0014] A condenser 203, one end of which is connected to the plate tower 201 and the other end of which is connected to the reflux tank 204;

[0015] A reflux tank 204, wherein one end of the top of the reflux tank 204 is connected to the condenser 203, and the bottom is connected to the plate tower 201 to reflux the condensate of the top product; the other end of the top of the reflux tank 204 is connected to the removal unit 3;

[0016] The reboiler 205 is connected to the plate tower 201 at its top and one side to vaporize the bottom product. A steam inlet pipe 206 and a condensed water outlet pipe 207 are provided on one side of the reboiler 205 to transfer heat and vaporize the bottom product in the reboiler 205. The bottom of the reboiler 205 is connected to a residual liquid storage tank 208 to enrich the bottom product.

[0017] Furthermore, the removal unit 3 comprises:

[0018] The reactor 301 is provided with an organic adsorbent to remove organic matter from the polyethylene glycol again; the top of the reactor 301 is connected to the reflux tank 204 in the distillation unit 2 and is provided with an agitator 302; the bottom of the reactor 301 is connected to the post-processing unit 4.

[0019] Furthermore, the post-processing unit 4 includes:

[0020] The resin dehydration kettle 401, the top of the resin dehydration kettle 401 is connected to the reaction kettle 301 in the removal unit 3; the bottom of the resin dehydration kettle 401 is connected to the molecular sieve dehydration kettle 402;

[0021] The molecular sieve dehydration kettle 402 is connected to the resin dehydration kettle 401 at the top to further remove water from the polyethylene glycol; and the bottom of the molecular sieve dehydration kettle 402 is connected to the polyethylene glycol storage tank 403.

[0022] Compared with the prior art, the beneficial effects of the present invention are:

[0023] The utility model provides a polyethylene glycol recovery device that can recover polyethylene glycol containing water and organic matter, has high separation and purification efficiency, reduces production costs and meets environmental protection requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present invention. The same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0025] Figure 1 A schematic diagram of the planar structure of a polyethylene glycol recovery device provided in an embodiment of the present utility model;

[0026] Figure 2 This is a partially enlarged view of a filter in a pretreatment unit of a polyethylene glycol recovery device provided in an embodiment of the present invention.

[0027] In the figure, 1. pretreatment unit; 2. distillation unit; 3. removal unit; 4. post-treatment unit; 101. sedimentation tank; 102. waste liquid input pipeline; 103. filter; 104. activated carbon adsorption layer; 105. quartz sand adsorption layer; 106. distillation feed liquid storage tank; 201. plate tower; 202. feed pipe; 203. condenser; 204. reflux tank; 205. reboiler; 206. water vapor inlet pipe; 207. condensed water outlet pipe; 208. residual liquid storage tank; 301. reactor; 302. agitator; 401. resin dehydration kettle; 402. molecular sieve dehydration kettle; 403. polyethylene glycol storage tank. DETAILED DESCRIPTION

[0028] The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0029] In the description of this application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0030] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. Throughout this application, unless otherwise specified, "plurality" means two or more.

[0031] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0032] Combine Figures 1-2 This embodiment discloses a polyethylene glycol recovery device, which is composed of a pretreatment unit 1, a distillation unit 2, a removal unit 3 and a post-treatment unit 4 connected in series;

[0033] In a specific embodiment of the present application, the pre-processing unit 1 includes:

[0034] A sedimentation tank 101 is provided with a waste liquid input pipeline 102 at the top of the sedimentation tank 101 for enriching the polyethylene glycol waste liquid and performing sedimentation treatment to remove insoluble impurities in the polyethylene glycol waste liquid; the bottom of the sedimentation tank 101 is connected to a filter 103;

[0035] A filter 103, wherein the top of the filter 103 is connected to the sedimentation tank 101 and an activated carbon adsorption layer 104 and a quartz sand adsorption layer 105 are sequentially arranged longitudinally to adsorb and filter organic matter in the polyethylene glycol waste liquid; the bottom of the filter 103 is connected to the distillation feed liquid storage tank 106;

[0036] A distillation feed liquid storage tank 106, one end of which is connected to the filter 103 to enrich and remove the polyethylene glycol waste liquid with insoluble impurities and organic matter; the other end of the distillation feed liquid storage tank 106 is connected to the distillation unit 2;

[0037] It can be understood that the polyethylene glycol waste liquid containing water and organic matter is input into the sedimentation tank 101 through the waste liquid input pipeline 102, and is allowed to stand and settle to remove insoluble impurities in the polyethylene glycol waste liquid. After that, the polyethylene glycol waste liquid flows into the filter 103, and is adsorbed and filtered by the activated carbon adsorption layer 104 and the quartz sand adsorption layer 105 to remove organic matter in the polyethylene glycol waste liquid. Finally, the polyethylene glycol waste liquid with insoluble impurities and organic matter removed is enriched in the distillation feed liquid storage tank 106 to complete the pretreatment.

[0038] In a specific embodiment of the present application, the distillation unit 2 includes:

[0039] A plate tower 201 is provided with a feed pipe 202 in the middle of the plate tower 201, which is connected to the distillation feed liquid storage tank 106 in the pretreatment unit 1 to realize the feeding of polyethylene glycol waste liquid; the top of the plate tower 201 is connected to the condenser 203 to condense the overhead product; the upper end of the side of the plate tower 201 is connected to the reflux tank 204 to reflux the overhead product condensate; the bottom of the plate tower 201 and the lower end of the side of the plate tower 201 are connected to the reboiler 205 to vaporize the bottom product;

[0040] A condenser 203, one end of which is connected to the plate tower 201 and the other end of which is connected to the reflux tank 204;

[0041] A reflux tank 204, wherein one end of the top of the reflux tank 204 is connected to the condenser 203, and the bottom is connected to the plate tower 201 to reflux the condensate of the top product; the other end of the top of the reflux tank 204 is connected to the removal unit 3;

[0042] A reboiler 205 is connected to the plate tower 201 at its top and one side to vaporize the bottom product. A steam inlet pipe 206 and a condensed water outlet pipe 207 are provided on one side of the reboiler 205 to transfer heat and vaporize the bottom product in the reboiler 205. The bottom of the reboiler 205 is connected to a residual liquid storage tank 208 to enrich the bottom product.

[0043] It can be understood that the polyethylene glycol waste liquid enriched in the distillation feed storage tank 106 flows into the plate tower 201 through the feed pipe 202, and flows into the reboiler 205, is vaporized by heat transfer of water vapor in the reboiler 205, flows back to the plate tower 201 in the form of a mixed gas, flows from the bottom end to the top end of the plate tower 201, and flows into the condenser 203 to form a condensate, which flows into the reflux tank 204. Part of the condensate flows back to the plate tower 201, mixes with the newly entered polyethylene glycol waste liquid, flows into the reboiler 205, and is re-vaporized. The bottom product in the reboiler 205 that cannot be re-vaporized flows into the residual liquid storage tank 208 to form the bottom product, and the non-reflux condensate in the reflux tank 204 forms the top product, that is, the polyethylene glycol waste liquid after distillation.

[0044] In a specific embodiment of the present application, the removal unit 3 includes:

[0045] Reactor 301, wherein an organic adsorbent is provided in the reactor 301 to remove organic matter from the polyethylene glycol again; the top of the reactor 301 is connected to the reflux tank 204 in the distillation unit 2 and is provided with an agitator 302; the bottom of the reactor 301 is connected to the post-processing unit 4;

[0046] It can be understood that the polyethylene glycol waste liquid after distillation is a constant boiling substance containing a small amount of organic matter and water. The small amount of organic matter and water need to be further processed separately. The polyethylene glycol waste liquid after distillation flows into the reactor 301. The organic adsorbent in the reactor 301 (activated carbon adsorbent is used as an example in this embodiment) can adsorb the small amount of organic matter in the constant boiling substance, further purify the polyethylene glycol, and improve the separation and purification efficiency of the polyethylene glycol.

[0047] In a specific embodiment of the present application, the post-processing unit 4 includes:

[0048] The resin dehydration kettle 401, the top of the resin dehydration kettle 401 is connected to the reaction kettle 301 in the removal unit 3; the bottom of the resin dehydration kettle 401 is connected to the molecular sieve dehydration kettle 402;

[0049] A molecular sieve dehydration kettle 402, the top of which is connected to the resin dehydration kettle 401 to further remove water from the polyethylene glycol; the bottom of which is connected to the polyethylene glycol storage tank 403;

[0050] It is understandable that after the organic adsorbent in the reactor 301 adsorbs a small amount of organic matter in the azeotrope, some water that is difficult to separate still exists in the azeotrope. Therefore, the resin dehydration reactor 401 and the molecular sieve dehydration reactor 402 are set up in sequence to further purify the polyethylene glycol using the resin and the molecular sieve, thereby improving the separation and purification efficiency of the polyethylene glycol.

[0051] In addition, those skilled in the art can add valves and / or pressure-sensing devices to each pipeline and each device based on the present invention as needed to meet the needs of safe production in this field.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. A polyethylene glycol recovery device, characterized in that: The polyethylene glycol recovery device is composed of a pretreatment unit, a distillation unit, a removal unit and a post-treatment unit connected in series; The pre-processing unit comprises: A sedimentation tank, wherein a waste liquid input pipeline is provided on the top of the sedimentation tank, which is used to enrich the polyethylene glycol waste liquid and perform sedimentation treatment to remove insoluble impurities in the polyethylene glycol waste liquid; the bottom of the sedimentation tank is connected to a filter; The top of the filter is connected to the sedimentation tank and is provided with an activated carbon adsorption layer and a quartz sand adsorption layer in sequence in the longitudinal direction to adsorb and filter organic matter in the polyethylene glycol waste liquid; the bottom of the filter is connected to the distillation feed liquid storage tank; A distillation feed liquid storage tank, one end of which is connected to a filter to enrich and remove polyethylene glycol waste liquid with insoluble impurities and organic matter; the other end of which is connected to a distillation unit.

2. A polyethylene glycol recovery device according to claim 1, characterized in that: The distillation unit comprises: A plate tower is provided with a feed pipe in the middle of the plate tower, which is connected to the distillation feed liquid storage tank in the pretreatment unit to realize the feeding of polyethylene glycol waste liquid; the top of the plate tower is connected to the condenser to condense the top product; the upper end of the side of the plate tower is connected to the reflux tank to reflux the condensate of the top product; the bottom of the plate tower and the lower end of the side of the plate tower are connected to the reboiler to vaporize the bottom product; A condenser, one end of which is connected to the plate tower and the other end of which is connected to the reflux tank; A reflux tank, wherein one end of the top of the reflux tank is connected to the condenser, and the bottom is connected to the plate tower to reflux the condensate of the top product of the tower; the other end of the top of the reflux tank is connected to the removal unit; A reboiler, wherein the top and one side of the reboiler are connected to the plate tower to vaporize the bottom product; a water vapor inlet pipe and a condensed water outlet pipe are provided on one side of the reboiler to transfer heat and vaporize the bottom product in the reboiler; the bottom of the reboiler is connected to the residual liquid storage tank to enrich the bottom product.

3. A polyethylene glycol recovery device according to claim 1, characterized in that: The removal unit comprises: A reactor is provided with an organic adsorbent for secondary removal of organic matter from polyethylene glycol; the top of the reactor is connected to the reflux tank in the distillation unit and is provided with a stirrer; the bottom of the reactor is connected to the post-processing unit.

4. A polyethylene glycol recovery device according to claim 1, characterized in that: The post-processing unit comprises: A resin dehydration kettle, wherein the top of the resin dehydration kettle is connected to the reaction kettle in the removal unit; and the bottom of the resin dehydration kettle is connected to the molecular sieve dehydration kettle; The top of the molecular sieve dehydration kettle is connected to the resin dehydration kettle to further remove water from the polyethylene glycol; the bottom of the molecular sieve dehydration kettle is connected to the polyethylene glycol storage tank.

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