CN117654084A - Methanol rectification online paraffin removal device and method - Google Patents
Methanol rectification online paraffin removal device and method Download PDFInfo
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- CN117654084A CN117654084A CN202311351934.5A CN202311351934A CN117654084A CN 117654084 A CN117654084 A CN 117654084A CN 202311351934 A CN202311351934 A CN 202311351934A CN 117654084 A CN117654084 A CN 117654084A
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- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 title claims abstract description 123
- 238000000034 method Methods 0.000 title claims abstract description 15
- 239000012188 paraffin wax Substances 0.000 title claims abstract description 15
- 239000007788 liquid Substances 0.000 claims abstract description 286
- 239000001993 wax Substances 0.000 claims abstract description 230
- 230000001105 regulatory effect Effects 0.000 claims abstract description 40
- 238000001514 detection method Methods 0.000 claims abstract description 31
- 239000002351 wastewater Substances 0.000 claims abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 18
- 238000000605 extraction Methods 0.000 claims abstract description 15
- 230000001276 controlling effect Effects 0.000 claims abstract description 3
- 238000004064 recycling Methods 0.000 claims description 10
- 230000008859 change Effects 0.000 claims description 7
- 238000010992 reflux Methods 0.000 claims description 6
- 238000011084 recovery Methods 0.000 claims description 5
- 150000001335 aliphatic alkanes Chemical class 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 claims description 4
- 229940057995 liquid paraffin Drugs 0.000 claims description 4
- 230000008569 process Effects 0.000 claims description 4
- 229920006395 saturated elastomer Polymers 0.000 claims description 4
- 238000003786 synthesis reaction Methods 0.000 claims description 4
- 238000011144 upstream manufacturing Methods 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 2
- 238000000926 separation method Methods 0.000 abstract description 4
- 238000004065 wastewater treatment Methods 0.000 abstract description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 3
- 238000007689 inspection Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000004821 distillation Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000003245 coal Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 235000019809 paraffin wax Nutrition 0.000 description 1
- 235000019271 petrolatum Nutrition 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Abstract
The invention relates to a methanol rectification separation technology, in particular to an online methanol rectification paraffin removal device and method. The last column plate in the rectifying column goes deep into the rectifying column kettle; a side liquid level detection system and a liquid wax outlet are additionally arranged on the tower wall in the range of the downcomer; the crude liquid wax outlet enters a liquid wax intermediate tank for heat tracing under the control of an outlet regulating valve through a heat tracing pipeline; after the crude liquid wax is layered in the middle tank, the wastewater at the bottom is pumped into the bottom of the rectifying tower under the control of a liquid level regulating valve, and the refined wax in the oil phase passes through a heat tracing pipe and a liquid level regulating valve from a side extraction outlet to be discharged out of a boundary area; the non-condensing water at the top of the middle tank returns to the gas phase space of the rectifying tower kettle. The method utilizes the density difference of liquid wax and water to store the liquid wax in a middle tank, prevents the liquid wax from being pumped into a reboiler and evaporated to the top of the tower, and ensures the normal operation of the liquid wax by periodically inspecting or controlling the liquid level difference at two sides to be manually or automatically extracted according to the quality of the product. After the liquid wax is separated from the wastewater, the COD of the wastewater is obviously reduced, and the wastewater treatment load is greatly reduced.
Description
Technical Field
The invention belongs to the technical field of chemical separation, and particularly relates to an online methanol rectification paraffin removal device and method.
Background
Liquid wax refers to a wax-like substance that assumes a liquid state at ordinary temperature. Wax is typically a solid substance, but under certain conditions it can be melted into a liquid state. Liquid waxes are typically one of the paraffin waxes, which are hydrocarbon compounds extracted or refined from petroleum. Typically, the feed to the methanol rectification of coal as a feedstock contains a small amount of saturated alkanes (liquid waxes) originating from the upstream synthesis section C8-C15. Because of the physical property of liquid wax, which is strongly soluble in organic solvents but poorly soluble in water, liquid wax is typically present in 1-20 plates of a pressurized/atmospheric/methanol recovery column, as the liquid wax is reduced in solubility as refined methanol is withdrawn during methanol refining. Because liquid wax impurity content is higher, if liquid wax is inhaled into the reboiler, can influence the methanol index after the evaporation, can also influence the waste water index for its turbidity takes color, and COD is unqualified, and this behavior has greatly influenced rectification efficiency.
Liquid wax intermediate tanks refer to containers or isolation devices for isolating liquid waxes of different types or different purities when storing, transporting or handling the liquid wax (typically paraffin or the like). Such devices are typically used to ensure that the quality and purity of the liquid wax is not contaminated or mixed to meet specific application requirements. The volume and structure of the liquid wax tundish will vary depending on the application requirements. They may be small laboratory containers or large industrial tanks, depending on the scale of production and use of the liquid wax. After separation of the liquid wax, it is considered to be recovered and reused to reduce waste generation and to improve resource utilization efficiency. The liquid wax tundish is periodically inspected and checked to ensure its proper operation and no leakage. If the risk of liquid wax entering the reboiler is found, measures can be taken for repair and maintenance. A liquid wax intermediate tank is then added after the methanol rectification unit (e.g., pressure column/atmospheric column/methanol recovery column) for separating the impurity liquid wax in the methanol rectification. By utilizing the density difference between the liquid wax and the water, two immiscible phases can be formed when the liquid wax and the water are mixed in the tower kettle, the layering phenomenon can be detected by a liquid level detector, the layering phenomenon can be discharged into a liquid wax intermediate tank through a liquid outlet after reaching a certain threshold value, and the liquid wax intermediate tank is manually extracted through irregular inspection and inspection so as to ensure the normal operation of the liquid wax intermediate tank.
Disclosure of Invention
The invention provides an online methanol rectification paraffin removal device and method for solving the problem that the existence of liquid paraffin can affect methanol indexes and wastewater indexes in methanol rectification.
The invention adopts the following technical scheme: an online methanol rectification paraffin removal device comprises a rectification tower (1); a tray (2); a downcomer (3); a rectifying tower side liquid level detection system (4); a crude liquid wax outlet (5); a heat trace line A (6); a crude liquid wax outlet regulating valve (7); a liquid wax intermediate tank (8); a liquid outlet (9) at the bottom of the liquid wax intermediate tank; a liquid outlet regulating valve (10) at the bottom of the liquid wax intermediate tank; a refined wax extraction port (11); a heat trace line B (12); a refined wax outlet regulating valve (13); a gas outlet (14) at the top of the liquid wax intermediate tank; a gas outlet regulating valve (15) at the top of the liquid wax intermediate tank; a liquid wax tundish level detection system (16);
wherein: the column plate (2) and the downcomer (3) are positioned in the rectifying tower (1);
a rectifying tower side liquid level detection system (4) and a crude liquid wax outlet (5) are arranged on the inner tower wall side of the rectifying tower (1) at one side of the downcomer (3), the rectifying tower side liquid level detection system (4) is distributed at the upper position and the lower position of the crude liquid wax outlet (5), the crude liquid wax outlet (5) is connected with a heat tracing pipeline A (6), the heat tracing pipeline A (6) is connected with a liquid wax intermediate tank (8), and a crude liquid wax outlet regulating valve (7) is arranged on the heat tracing pipeline A (6);
a liquid wax intermediate tank liquid level detection system (16) is arranged on one side surface of the liquid wax intermediate tank (8), a liquid wax intermediate tank bottom liquid outlet (9) is arranged at the bottom of the liquid wax intermediate tank (8) and is connected with the bottom of the rectifying tower (1) through a liquid wax intermediate tank bottom liquid outlet regulating valve (10); the other side surface of the liquid wax intermediate tank (8) is provided with a refined wax extraction outlet (11), the refined wax extraction outlet (11) is connected with a heat tracing pipeline B (12), and the heat tracing pipeline B (12) is provided with a refined wax outlet regulating valve (13); the top of the liquid wax intermediate tank (8) is provided with a liquid wax intermediate tank top air outlet (14), and the liquid wax intermediate tank top air outlet (14) is connected with the side surface of the rectifying tower (1) through a liquid wax intermediate tank top air outlet regulating valve (15);
the downcomer (3) is deep below the liquid level in the rectifying tower (1);
the downcomer (3) at least comprises a tray (2) arranged at the lowest part in the rectifying tower (1).
Further, the liquid wax intermediate tank liquid level detection system (16) is distributed at the upper position and the lower position of the refined wax extraction outlet (11).
The second technical scheme of the invention is a paraffin removal method of a methanol rectification online paraffin removal device, and the online paraffin removal process recovers saturated alkane (liquid paraffin) generated in an upstream synthesis section C8-C15, and comprises the following steps:
s1, the downcomer (3) goes deep under the liquid level of the tower kettle of the rectifying tower (1) until the end socket weld joint, and the waste water containing liquid wax flows into the tower kettle through the tower plate (2) and the downcomer (3);
s2, detecting the change of the liquid level of the tower kettle by a liquid level detection system (4) at the side of the rectifying tower, wherein the liquid level difference delta H is formed after liquid wax is enriched and layered with water, and the liquid reaches a threshold value and flows out through a crude liquid wax outlet (5);
s3, the crude liquid wax outlet (5) is connected with a liquid wax intermediate tank (8) through a heat tracing pipeline (6);
s4, controlling the flow of crude liquid wax extracted from the rectifying tower (1) through a crude liquid wax outlet regulating valve (7) by a liquid wax intermediate tank (8), and temporarily storing liquid wax materials;
s5, detecting the liquid level change of the liquid wax intermediate tank (8) by a liquid wax intermediate tank liquid level detection system (16), and extracting the liquid wax from the refined wax extraction outlet (11) when the liquid level change reaches a threshold value;
s6, discharging of the refined wax outlet (11) is controlled by a refined wax outlet regulating valve (13) through a heat tracing pipeline (12);
s7, the temperature of the heat tracing pipeline (6) and the heat tracing pipeline (12) is more than 100 ℃;
s8, a liquid outlet (9) at the bottom of the liquid wax intermediate tank is used for recycling the waste water which does not contain liquid wax at the lower layer in the liquid wax intermediate tank (8) and is pumped into the bottom of the rectifying tower (1), and the flow is controlled by a liquid outlet regulating valve (10) at the bottom of the liquid wax intermediate tank;
s9, a gas outlet (14) at the top of the liquid wax intermediate tank is used for recycling non-condensing steam in the liquid wax intermediate tank (8) and returning the non-condensing steam to a gas phase space of a tower kettle of the rectifying tower (1);
the operating pressure range of the S10 rectifying tower (1) is 30-600kPa, the temperature range is 80-165 ℃, the reflux ratio is 1-10, preferably the operating pressure of the rectifying tower (1) is 580kPa, the tower bottom temperature is 165 ℃, and the reflux ratio is 3.
And S11, estimating the flow of the liquid wax intermediate tank (8) by the actual operating pressure and temperature of the wastewater at the tower bottom of the rectifying tower (1).
Further, the rectifying tower (1) is a tower for extracting wastewater from the bottom of the methanol rectifying device, and comprises a last tower or two towers, such as a pressurizing tower in a reverse methanol rectifying device or an atmospheric tower and a methanol recovery tower of a forward methanol rectifying device.
Further, the liquid wax is enriched and layered in the tower kettle of the rectifying tower (1), detected by a liquid level detection system (4) at the side surface of the rectifying tower, and timely discharged from a crude liquid wax outlet (5) so as to prevent the liquid wax from being pumped into a reboiler.
The invention utilizes the density difference of liquid wax and water, two incompatible phases are formed when the liquid wax and water are mixed in a tower kettle, the liquid level difference is detected by a liquid level detector, and is discharged into a liquid wax intermediate tank through a liquid outlet of a rectifying tower after reaching a certain threshold value, so that the liquid wax is prevented from being pumped into a reboiler and evaporated to the tower top, thereby influencing the product quality, and the liquid level difference on two sides of each class is manually or automatically controlled to be extracted through irregular inspection or control so as to ensure the normal operation of the liquid wax.
The invention is characterized in that:
firstly, the rectifying tower (1) can ensure that the wastewater at the bottom of the rectifying tower (1) is qualified only by additionally arranging a rectifying tower side liquid level detection system (4) and a crude liquid wax outlet (5) on the tower wall within the range of the downcomer (3) and discharging the crude liquid wax into a liquid wax intermediate tank (8) through detecting the liquid level difference of the tower kettle.
Then, by utilizing the density difference of liquid wax and water, two immiscible phases are formed when the liquid wax and the water are mixed in a tower kettle, and the liquid wax and the water are discharged into a liquid wax intermediate tank (8) through a crude liquid wax outlet (5) after reaching a certain threshold value (the liquid level is 70% of the maximum liquid level) through a rectifying tower side liquid level detection system (4), and are manually extracted to directly separate a boundary area to be sold as a product or mixed with other liquid to obtain a required product or mixture.
And secondly, the top of the liquid wax intermediate tank (8) is provided with an air outlet for recycling trace non-condensing water carried out from the rectifying tower (1), and the bottom of the liquid wax intermediate tank is provided with a liquid outlet for recycling wastewater carried out from the rectifying tower (1).
Finally, the pressure range of the rectifying tower is wide, and the flow of the liquid wax intermediate tank (8) is estimated by the actual operating pressure and temperature of the wastewater at the tower bottom of the rectifying tower (1).
Advantageous effects
The invention not only recycles the liquid wax, but also solves the problem of unqualified waste water products.
After the liquid wax is separated from the wastewater, the COD of the wastewater is obviously reduced, and the wastewater treatment load is greatly reduced.
The invention ensures that the liquid wax does not influence the rectification process and the quality of the methanol and reduces the risk of environmental pollution.
The invention is suitable for new devices and technical transformation.
Drawings
FIG. 1 is a schematic diagram of the separation of methanol distillation on-line dewaxing.
Wherein: rectifying tower-1; tray-2; a downcomer-3; a rectifying tower side liquid level detection system-4; a crude liquid wax outlet-5; a heat tracing pipeline A-6; a crude liquid wax outlet regulating valve-7; a liquid wax intermediate tank-8; a liquid outlet at the bottom of the liquid wax intermediate tank-9; a liquid outlet regulating valve-10 at the bottom of the liquid wax intermediate tank; refined wax extraction port-11; heat tracing pipeline B-12; refined wax outlet regulating valve-13; a gas outlet at the top of the liquid wax intermediate tank is 14; a gas outlet regulating valve-15 at the top of the liquid wax intermediate tank; and a liquid wax intermediate tank liquid level detection system-16.
Detailed Description
The invention will be described in more detail by means of the following examples in connection with the accompanying drawings, without being limited to the following examples, the disclosure of which is intended to protect all changes and modifications within the scope of the invention:
as shown in fig. 1, the device connection is as follows: the wax removing device comprises: a rectifying tower 1; a column plate 2; a downcomer 3; a rectifying column side liquid level detection system 4; a crude liquid wax outlet 5; a heat tracing line A6; a crude liquid wax outlet regulating valve 7; a liquid wax intermediate tank 8; a liquid outlet 9 at the bottom of the liquid wax intermediate tank; a liquid wax middle tank bottom liquid outlet regulating valve 10; refined wax extraction 11; a heat tracing line B12; a refined wax outlet regulating valve 13; a liquid wax tundish top outlet 14; a liquid wax intermediate tank top air outlet regulating valve 15; a liquid wax tundish level detection system 16.
Wherein: the tower plate 2 and the downcomer 3 are positioned in the rectifying tower 1; the rectifying column side liquid level detection system 3 is positioned at the column wall side in the downcomer 3; meanwhile, a crude liquid wax outlet 5 is positioned at the tower wall side in the downcomer 3, and the outlet flow is controlled by a crude liquid wax outlet regulating valve 7 to be connected with a liquid wax intermediate tank 8 through a heat tracing pipeline A6; the liquid wax intermediate tank 8 detects the refined wax liquid level through a liquid wax intermediate tank liquid level detection system 16 on the side surface, and two liquid outlets are respectively connected with two control valves; the liquid outlet 9 at the bottom of the liquid wax intermediate tank is positioned at the bottom of the liquid wax intermediate tank 8 and is connected with the rectifying tower 1 through the liquid outlet regulating valve 10 at the bottom of the liquid wax intermediate tank; the refined wax extraction port 11 is positioned on the side surface of the liquid wax intermediate tank 8 and is connected with the refined wax outlet regulating valve 13 through the heat tracing pipeline B12; the top air outlet 14 of the liquid wax intermediate tank is positioned at the top of the liquid wax intermediate tank 8 and is connected with the side surface of the rectifying tower 1 through the air outlet regulating valve 15 at the top of the liquid wax intermediate tank.
The rectifying tower 1 is a tower for extracting wastewater from the bottom of the methanol rectifying device, and usually comprises a last tower or two towers, such as a pressurizing tower in a reverse methanol rectifying device or an atmospheric tower and a methanol recovery tower of a forward methanol rectifying device. Liquid wax is enriched and layered in the tower kettle of the rectifying tower 1, timely detected by a liquid level detection system 4 at the side surface of the rectifying tower, and timely discharged from a crude liquid wax outlet 5, so that the liquid wax is prevented from being pumped into a reboiler. A liquid wax intermediate tank 8 is installed beside the rectifying column 1 for recovering the saturated alkane liquid wax produced in the upstream synthesis section C8-C15. The liquid wax intermediate tank liquid level detection system 16 is arranged outside the liquid wax intermediate tank 8 and is used for detecting the liquid level of the stored liquid wax in the intermediate tank, and after a certain threshold value is reached, the liquid wax is timely manually extracted from the refined wax extraction port 11. In addition, the liquid wax intermediate tank 8 is further provided with a bottom liquid outlet and a top air outlet, wherein the liquid wax intermediate tank bottom liquid outlet 9 is used for recycling wastewater carried out from the rectifying tower 1, and the liquid wax intermediate tank top air outlet 14 is used for recycling trace non-condensing water carried out from the rectifying tower 1.
The process flow adopted by the invention comprises the following steps:
1) The crude methanol raw material containing liquid wax flows into a rectifying tower 1, and the solubility of the crude methanol raw material is reduced along with the distillation of refined methanol at the top of the tower due to the strong alcohol solubility and weak water solubility of the liquid wax until the last tower plate 2 at the bottom of the tower flows into the tower kettle through a downcomer 3;
2) The downcomer 2 goes deep under the liquid level of the rectifying tower 1 until the end socket weld joint, the liquid wax and the water layer form a certain liquid level difference delta H, and the liquid wax and the water layer are detected by a rectifying tower side liquid level detection system 4 and then reach a certain threshold value and are discharged through a crude liquid wax outlet 5;
3) Crude liquid wax is controlled to be extracted from the rectifying tower 1 through a crude liquid wax outlet regulating valve 7 and is stored in a liquid wax intermediate tank 8;
4) The liquid wax intermediate tank liquid level detection system 16 timely detects the liquid level change of the liquid wax intermediate tank 8, reaches a certain threshold value, is controlled by the refined wax outlet 11 through the refined wax outlet regulating valve 13 to be manually extracted, and directly separates out a boundary area to be sold as a product or mixed with other liquid to obtain a required product or mixture;
5) The liquid outlet 9 at the bottom of the liquid wax intermediate tank is used for recycling the wastewater which does not contain liquid wax at the lower layer in the liquid wax intermediate tank 8, the wastewater is pumped into the bottom of the rectifying tower 1, and the flow is controlled by the liquid outlet regulating valve 10 at the bottom of the liquid wax intermediate tank;
6) The gas outlet 14 at the top of the liquid wax intermediate tank is used for recycling the non-condensing steam in the liquid wax intermediate tank 8 and returning the non-condensing steam to the gas phase space of the tower kettle of the rectifying tower 1; the operating pressure range of the rectifying tower 1 is 30-600kPa, the temperature range is 80-165 ℃, the reflux ratio is 1-10, the preferential operating pressure is 580kPa, the tower kettle temperature is 165 ℃, and the reflux ratio is 3.
The methanol content in the wastewater is less than 50ppm, the purity of the methanol is more than 99.85 percent, the yield is more than 99.8 percent, and the ethanol content is less than 10ppm. The wastewater has clear color, and the COD index of the wastewater at the bottom of the tower is ensured to be qualified.
Claims (7)
1. The methanol rectification on-line paraffin removal device is characterized by comprising a rectifying tower (1); a tray (2); a downcomer (3); a rectifying tower side liquid level detection system (4); a crude liquid wax outlet (5); a heat trace line A (6); a crude liquid wax outlet regulating valve (7); a liquid wax intermediate tank (8); a liquid outlet (9) at the bottom of the liquid wax intermediate tank; a liquid outlet regulating valve (10) at the bottom of the liquid wax intermediate tank; a refined wax extraction port (11); a heat trace line B (12); a refined wax outlet regulating valve (13); a gas outlet (14) at the top of the liquid wax intermediate tank; a gas outlet regulating valve (15) at the top of the liquid wax intermediate tank; a liquid wax tundish level detection system (16);
wherein: the column plate (2) and the downcomer (3) are positioned in the rectifying tower (1);
the device is characterized in that a rectifying tower side liquid level detection system (4) and a crude liquid wax outlet (5) are arranged on the inner tower wall side of a rectifying tower (1) on one side of a downcomer (3), the crude liquid wax outlet (5) is connected with a heat tracing pipeline A (6), the heat tracing pipeline A (6) is connected with a liquid wax intermediate tank (8), and a crude liquid wax outlet regulating valve (7) is arranged on the heat tracing pipeline A (6);
a liquid wax intermediate tank liquid level detection system (16) is arranged on one side surface of the liquid wax intermediate tank (8), a liquid wax intermediate tank bottom liquid outlet (9) is arranged at the bottom of the liquid wax intermediate tank (8) and is connected with the bottom of the rectifying tower (1) through a liquid wax intermediate tank bottom liquid outlet regulating valve (10); the other side surface of the liquid wax intermediate tank (8) is provided with a refined wax extraction outlet (11), the refined wax extraction outlet (11) is connected with a heat tracing pipeline B (12), and the heat tracing pipeline B (12) is provided with a refined wax outlet regulating valve (13); the top of the liquid wax intermediate tank (8) is provided with a liquid wax intermediate tank top air outlet (14), and the liquid wax intermediate tank top air outlet (14) is connected with the side surface of the rectifying tower (1) through a liquid wax intermediate tank top air outlet regulating valve (15);
the downcomer (3) is deep below the liquid level in the rectifying tower (1);
the downcomer (3) at least comprises a tray (2) arranged at the lowest part in the rectifying tower (1).
2. The methanol rectification on-line paraffin removal device according to claim 1, wherein the liquid level detection system (16) of the liquid paraffin intermediate tank is distributed at the upper position and the lower position of the refined paraffin extraction outlet (11).
3. The methanol rectification on-line paraffin removal device according to claim 1, wherein the rectification column side liquid level detection system (4) is distributed at the upper position and the lower position of the crude liquid paraffin outlet (5).
4. A method for removing wax by using an on-line dewaxing device for methanol rectification as claimed in claim 1, 2 or 3, wherein the on-line dewaxing process recovers saturated alkane (liquid wax) produced in the upstream synthesis section C8-C15, comprising the steps of:
s1, the downcomer (3) goes deep under the liquid level of the tower kettle of the rectifying tower (1) until the end socket weld joint, and the waste water containing liquid wax flows into the tower kettle through the tower plate (2) and the downcomer (3);
s2, detecting the change of the liquid level of the tower kettle by a liquid level detection system (4) at the side of the rectifying tower, wherein the liquid level difference delta H is formed after liquid wax is enriched and layered with water, and the liquid reaches a threshold value and flows out through a crude liquid wax outlet (5);
s3, the crude liquid wax outlet (5) is connected with a liquid wax intermediate tank (8) through a heat tracing pipeline (6);
s4, controlling the flow of crude liquid wax extracted from the rectifying tower (1) through a crude liquid wax outlet regulating valve (7) by a liquid wax intermediate tank (8), and temporarily storing liquid wax materials;
s5, detecting the liquid level change of the liquid wax intermediate tank (8) by a liquid wax intermediate tank liquid level detection system (16), and extracting the liquid wax from the refined wax extraction outlet (11) when the liquid level change reaches a threshold value;
s6, discharging of the refined wax outlet (11) is controlled by a refined wax outlet regulating valve (13) through a heat tracing pipeline (12);
s7, the temperature of the heat tracing pipeline (6) and the heat tracing pipeline (12) is more than 100 ℃;
s8, a liquid outlet (9) at the bottom of the liquid wax intermediate tank is used for recycling the waste water which does not contain liquid wax at the lower layer in the liquid wax intermediate tank (8) and is pumped into the bottom of the rectifying tower (1), and the flow is controlled by a liquid outlet regulating valve (10) at the bottom of the liquid wax intermediate tank;
s9, a gas outlet (14) at the top of the liquid wax intermediate tank is used for recycling non-condensing steam in the liquid wax intermediate tank (8) and returning the non-condensing steam to a gas phase space of a tower kettle of the rectifying tower (1);
s10, the operating pressure range of the rectifying tower (1) is 30-600kPa, the temperature range is 80-165 ℃, and the reflux ratio is 1-10;
and S11, estimating the flow of the liquid wax intermediate tank (8) by the actual operating pressure and temperature of the wastewater at the tower bottom of the rectifying tower (1).
5. The method according to claim 4, wherein the rectifying tower (1) is a tower for extracting waste water from the bottom of the methanol rectifying device, and at least comprises a pressurizing tower in a reverse methanol rectifying device or an atmospheric tower and a methanol recovery tower of a forward methanol rectifying device.
6. The method according to claim 4, wherein liquid wax is enriched and layered with water in the tower kettle of the rectifying tower (1), detected by a liquid level detection system (4) at the side surface of the rectifying tower, and timely discharged from a crude liquid wax outlet (5) to prevent the liquid wax from being pumped into a reboiler.
7. The method according to claim 4, wherein the operating pressure of the rectifying column (1) is 580kPa, the column bottom temperature is 165 ℃, and the reflux ratio is 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311351934.5A CN117654084A (en) | 2023-10-18 | 2023-10-18 | Methanol rectification online paraffin removal device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311351934.5A CN117654084A (en) | 2023-10-18 | 2023-10-18 | Methanol rectification online paraffin removal device and method |
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| Publication Number | Publication Date |
|---|---|
| CN117654084A true CN117654084A (en) | 2024-03-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311351934.5A Pending CN117654084A (en) | 2023-10-18 | 2023-10-18 | Methanol rectification online paraffin removal device and method |
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| Country | Link |
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| CN (1) | CN117654084A (en) |
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2023
- 2023-10-18 CN CN202311351934.5A patent/CN117654084A/en active Pending
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