Mixed ester distillation separation system

Abstract

A mixed ester distillation separation system comprises a distillation tower, a feed inlet of the distillation tower is connected with a mixed ester source, a circulation pipeline is arranged at the tower bottom of the distillation tower, the upstream end of the circulation pipeline is connected with the tower bottom, the downstream end of the circulation pipeline is connected with the side wall of the distillation tower, a reboiler and a circulation pump are arranged on the circulation pipeline, and the circulation pump is located at the upstream of the reboiler. A feeding port of the filter press is connected to the circulating pipeline through a first pipeline and located between the circulating pump and the reboiler, a first valve is arranged on the first pipeline, a liquid discharging port of the filter press is connected with the circulating pipeline through a second pipeline and located on the downstream portion of the reboiler, and a filter residue outlet of the filter press supplies materials to the incineration tower. A buffer tank and a material conveying pump are arranged on the third pipeline, and the material conveying pump is positioned at the downstream of the buffer tank. The device is simple in structure and low in improvement cost, the utilization rate of mixed ester can be effectively improved, and waste of materials is avoided.

Description

Technical Field

[0001] The utility model relates to the field of chemical industry, in particular to a mixed ester distillation separation system. Background Art

[0002] Chemical companies use mixed dibasic acids as raw materials to react with alcohols to form mixed esters, which are then separated in distillation towers to obtain different products.

[0003] Since the dibasic acid used as raw material itself contains carbon particle impurities, after the mixed ester is distilled to a certain extent in the distillation tower, the heavy components at the bottom of the tower are no longer distilled, but directly discharged to the incineration tower for incineration treatment to avoid coking in the distillation tower.

[0004] This results in a waste of mixed esters, which is not conducive to reducing costs and increasing efficiency for enterprises.

[0005] Therefore, how to maximize the utilization rate of mixed esters is a problem that those skilled in the art need to solve. Summary of the invention

[0006] The utility model aims to provide a mixed ester distillation separation system in view of the deficiencies of the prior art, which has a simple structure and low transformation cost, can effectively improve the utilization rate of the mixed ester and prevent waste of materials.

[0007] The technical scheme of the utility model is: a mixed ester distillation separation system, comprising a distillation tower, a feed inlet of the distillation tower being connected to a mixed ester source, a circulation pipeline being arranged at the bottom of the distillation tower, an upstream end of the circulation pipeline being connected to the bottom of the tower, and a downstream end being connected to a side wall of the distillation tower, a reboiler and a circulation pump being arranged on the circulation pipeline, and the circulation pump being located upstream of the reboiler, and also comprising a filter press, an inlet of the filter press being connected to the circulation pipeline through a first pipeline, and being located between the circulation pump and the reboiler, a first valve being arranged on the first pipeline, a discharge port of the filter press being connected to the circulation pipeline through a second pipeline, and being located downstream of the reboiler, a filter residue outlet of the filter press feeding an incinerator, a buffer tank and a feed pump being arranged on the second pipeline, and the feed pump being located downstream of the buffer tank.

[0008] It also includes a third pipeline, the upstream end of which is connected to the second pipeline and is located downstream of the feed pump, and the downstream end is connected to the feed inlet of the distillation tower. A second valve is arranged on the third pipeline.

[0009] The above technical solution has the following beneficial effects:

[0010] 1. A mixed ester distillation separation system comprises a distillation tower, wherein the feed inlet of the distillation tower is connected to the mixed ester source, a circulation pipeline is arranged at the bottom of the distillation tower, the upstream end of the circulation pipeline is connected to the bottom of the tower, and the downstream end is connected to the side wall of the distillation tower, a reboiler and a circulation pump are arranged on the circulation pipeline, and the circulation pump is located upstream of the reboiler, the mixed ester enters the distillation tower from the feed inlet, and is circulated and heated by the reboiler, and different components are discharged from the distillation tower in the form of vapor phase by controlling the parameters of the distillation tower. It also comprises a filter press, the inlet of the filter press is connected to the circulation pipeline through a first pipeline, and is located between the circulation pump and the reboiler, and a first valve is arranged on the first pipeline. When the mixed ester is separated by distillation, the first valve can be opened to allow part of the bottom liquid (heavy component mixed ester) to enter the filter press to separate the impurities therein, especially when the distillation reaches a certain degree, the bottom liquid of the tower mainly contains heavy component mixed ester, and the impurity concentration is high, and in addition, it can also ensure that the reboiler can normally heat and raise the temperature of the bottom liquid of the distillation tower. The discharge port of the filter press is connected to the circulation pipeline through the second pipeline and is located downstream of the reboiler. The heavy component mixed esters after impurities removal are returned to the distillation tower, and the target product is obtained by further heating and distillation, thereby eliminating the waste of heavy component mixed esters. In addition, the coking condition in the distillation tower can be significantly reduced, and the operation cycle of the distillation tower can be extended. The filter residue outlet of the filter press supplies the incineration tower, and the difficulty of handling the filter residue is reduced after incineration treatment. A buffer tank and a feed pump are provided on the second pipeline, and the feed pump is located downstream of the buffer tank. The heavy component mixed esters obtained by filtration first enter the buffer tank, and after the liquid level reaches a certain height, they are pumped back to the distillation tower by the feed pump, ensuring that the heavy component mixed esters after impurities removal can be smoothly returned to the distillation tower, and the normal operation of the feed pump can be ensured.

[0011] 2. It also includes a third pipeline, the upstream end of which is connected to the second pipeline and is located downstream of the feed pump, and the downstream end is connected to the feed port of the distillation tower. A second valve is arranged on the third pipeline. By opening the second valve, part of the removed heavy component mixed ester is returned to the distillation tower through the feed port of the distillation tower, and the target product is obtained by further heating and distillation. The feed port of the distillation tower can also be flushed to reduce the risk of blockage of the distillation tower.

[0012] Further description is given below in conjunction with the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a connection diagram of the utility model.

[0014] In the accompanying drawings, 1 is a distillation tower, 11 is a feed inlet, 12 is a circulation pipeline, 2 is a reboiler, 3 is a circulation pump, 4 is a filter press, 5 is a buffer tank, 6 is a feed pump, 101 is a first pipeline, 102 is a second pipeline, 103 is a third pipeline, a is a first valve, and b is a second valve. DETAILED DESCRIPTION

[0015] See also Figure 1, which is a specific embodiment of a mixed ester distillation separation system. The mixed ester distillation separation system comprises a distillation tower 1, wherein a feed port 11 of the distillation tower 1 is connected to a mixed ester source, a circulation pipeline 12 is arranged at the bottom of the distillation tower 1, the upstream end of the circulation pipeline 12 is connected to the bottom of the tower, and the downstream end is connected to the side wall of the distillation tower, a reboiler 2 and a circulation pump 3 are arranged on the circulation pipeline 12, and the circulation pump 3 is located upstream of the reboiler 2. Obviously, a tower top condenser is arranged at the top of the distillation tower, and the vapor phase discharged from the top of the distillation tower is condensed into a liquid state by the tower top condenser, and part of it is extracted as a target product, and part of it is refluxed to the distillation tower to improve the purity of the extracted target product. It also comprises a filter press 4, wherein the inlet of the filter press 4 is connected to the circulation pipeline 12 through a first pipeline 101, and is located between the circulation pump 3 and the reboiler 2, and a first valve a is arranged on the first pipeline 101, and the flow rate of the distillation tower bottom entering the filter press through the first pipeline is adjusted by adjusting the opening of the first valve. The discharge port of the filter press 4 is connected to the circulation pipeline 12 through the second pipeline 102 and is located downstream of the reboiler 2. In this embodiment, a third pipeline 103 is also included. The upstream end of the third pipeline 103 is connected to the second pipeline 102 and is located downstream of the feed pump 6. The downstream end is connected to the feed port 11 of the distillation tower. A second valve b is arranged on the third pipeline 103. The filter residue outlet of the filter press 4 feeds the incineration tower. The second pipeline 102 is provided with a buffer tank 5 and a feed pump 6, and the feed pump 6 is located downstream of the buffer tank 5. Specifically, the feed port of the buffer tank is arranged at the top of the buffer tank, and the discharge port of the buffer tank is arranged at the bottom of the buffer tank.

[0016] The working principle of the utility model is as follows: the mixed ester obtained by the production of mixed dibasic acid enters the interior of the distillation tower through the feed port of the distillation tower, the bottom temperature of the distillation tower is controlled by a reboiler, and the vacuum degree of the distillation tower is controlled to perform the distillation process, and the light components are separated out of the distillation tower one by one. When the light components are distilled to a certain extent, the first valve is opened to allow the heavy components at the bottom of the distillation tower to partially enter the filter press during the circulation process, and after the impurities therein are separated, they are refluxed to the distillation tower through the discharge port of the filter press and the second pipeline, and the distillation treatment is continued, thereby reducing the coking amount inside the distillation tower and extending the operation cycle of the distillation tower. The filtered heavy components discharged from the filter press can also open the second valve, and partially flow back to the distillation tower through the feed port of the distillation tower using the third pipeline to rinse the feed port of the distillation tower. The filter residue (mainly carbon particles) discharged from the filter press is sent to the incineration tower for incineration treatment.

Claims

1. A mixed ester distillation separation system, comprising a distillation tower (1), wherein a feed inlet (11) of the distillation tower (1) is connected to a mixed ester source, a circulation pipeline (12) is arranged at the bottom of the distillation tower (1), an upstream end of the circulation pipeline (12) is connected to the bottom of the tower, and a downstream end is connected to a side wall of the distillation tower, a reboiler (2) and a circulation pump (3) are arranged on the circulation pipeline (12), and the circulation pump (3) is located upstream of the reboiler (2), Features: The invention also comprises a filter press (4), the inlet of the filter press (4) being connected to the circulation pipeline (12) through a first pipeline (101) and being located between the circulation pump (3) and the reboiler (2); a first valve (a) being arranged on the first pipeline (101); a liquid discharge port of the filter press (4) being connected to the circulation pipeline (12) through a second pipeline (102) and being located downstream of the reboiler (2); a filter residue outlet of the filter press (4) supplying material to an incineration tower; a buffer tank (5) and a feed pump (6) being arranged on the second pipeline (102), and the feed pump (6) being located downstream of the buffer tank (5).

2. The mixed ester distillation separation system according to claim 1, Features: The invention also comprises a third pipeline (103), wherein the upstream end of the third pipeline (103) is connected to the second pipeline (102), is located downstream of the feed pump (6), and the downstream end is connected to the feed inlet (11) of the distillation tower. A second valve (b) is arranged on the third pipeline (103).

Images