Device for improving purity of carbon four vacuum distillation heavy tower bottom product

Abstract

The utility model relates to a carbon four decompression distillation de -heavy tower bottom product purity improving device. Its technical scheme is: the bottom discharge port of de -heavy tower is connected to the upper feeding port of fine de -heavy tower through the pipeline, the discharge port is connected to the isomerization compressor inlet buffer tank through the pipeline, the outlet is connected the inlet of isomerization compressor through the pipeline, and the outlet of isomerization compressor is connected to the upper feeding port of de -heavy tower through the pipeline, and the bottom of fine de -heavy tower is connected to heavy component product cooler through pipeline and heavy component product external sending pump. Advantageous effects are: the utility model adds fine de -heavy tower and isomerization compressor, the carbon four olefin carrying amount in the heavy component product of the bottom of fine de -heavy tower after decompression distillation is less than 4%, the heavy component material of the bottom is pressurized after through heavy component product external sending pump, then is cooled and cooled down through heavy component product cooler, and is sent to the storage and transportation tank area, realizes the purpose of improving the purity of de -heavy tower bottom product through decompression distillation and circulating rectification operation.

Description

Technical Field

[0001] This utility model relates to a C4 raw material refining device, and in particular to a device for improving the purity of the bottom product of a C4 vacuum distillation deweighting tower. Background Technology

[0002] As an important petroleum resource, C4 liquefied petroleum gas (LPG) plays an increasingly important role in chemical production, and its comprehensive utilization methods are becoming more extensive. Among these methods, the synthesis of methyl tert-butyl ether (MTBE) from isobutylene (C4 hydrocarbons) reacting with methanol is currently the main approach for C4 utilization in China. The key indicator affecting the yield and economic benefits of MTBE from C4 plants is the olefin utilization rate. The low olefin utilization rate is mainly due to the loss of olefins carried over to the bottom of the heavy component product from the de-heavy component tower. Currently, the C4 olefin content in the heavy component product is approximately 10%. To improve the olefin utilization rate, reduce operating costs, and enhance the plant's economic efficiency, it is necessary to reduce the amount of C4 olefins carried over to the bottom of the heavy component tower. Utility Model Content

[0003] The purpose of this invention is to address the aforementioned deficiencies in the existing technology by providing a device for improving the purity of the bottom product of a C4 vacuum distillation de-weighting column. This device achieves the goal of improving the purity of the bottom product of the de-weighting column by adding a fine de-weighting column and an isomerization compressor, and through vacuum distillation and circulating distillation operations.

[0004] This utility model discloses a device for improving the purity of the bottom product of a C4 vacuum distillation deweighting tower. The technical solution includes a deweighting tower (C-6301), a fine deweighting tower (C-6302), a heavy component product external pump (P-6302), an isomerization compressor inlet buffer tank (D-6301), an isomerization compressor (K-6301), and a heavy component product cooler (E-6302). The bottom outlet of the deweighting tower (C-6301) is connected to the upper inlet of the fine deweighting tower (C-6302) via a pipeline, and the top outlet of the fine deweighting tower (C-6302) is connected to the bottom outlet of the fine deweighting tower (C-6302) via a pipeline. A line is connected to the inlet of the isomerization compressor inlet buffer tank (D-6301). The outlet of the isomerization compressor buffer tank (D-6301) is connected to the inlet of the isomerization compressor (K-6301) via a pipeline. The outlet of the isomerization compressor (K-6301) is connected to the upper feed port of the de-weighting tower (C-6301) via a pipeline. The bottom of the fine de-weighting tower (C-6302) is connected to the heavy component product cooler (E-6302) via a pipeline and the heavy component product external pump (P-6302). The outlet of the heavy component product cooler (E-6302) is connected to the storage and transportation tank area via a pipeline.

[0005] Preferably, the top outlet of the aforementioned de-weighting tower (C-6301) is connected to the inlet of the air cooler (A-6301) of the reaction unit via a pipeline, the bottom outlet of the air cooler (A-6301) of the reaction unit is connected to the top shell inlet of the top condenser (E-6307) of the de-weighting tower via a pipeline, and the shell outlet of the top condenser (E-6307) of the de-weighting tower is connected to the top reflux tank (D-6302) of the de-weighting tower via a pipeline.

[0006] Preferably, the bottom outlet of the above-mentioned top reflux tank (D-6302) is connected to the inlet of the top reflux pump (P-6301) of the top reflux tank of the top reflux tower through a pipeline, and the outlet of the top reflux pump (P-6301) of the top reflux tank of the top reflux tower is sent to the etherification unit after being cooled by the reaction product cooler (E-6305) through a pipeline.

[0007] Preferably, a bottom reboiler (E-6310) is installed at the bottom of the above-mentioned de-weighting tower (C-6302).

[0008] Preferably, a bottom reboiler (C-6310) is installed at the bottom of the aforementioned deweighting tower (C-6301).

[0009] Preferably, the bottom outlet of the above-mentioned top reflux tank (D-6302) of the deweight removal tower is connected to the inlet of the top reflux pump (P-6301) of the deweight removal tower via a pipeline. The outlet of the top reflux pump (P-6301) of the deweight removal tower is divided into two pipelines. One pipeline is connected to the reflux port on the upper side of the deweight removal tower (C-6301), and the other pipeline is sent to the etherification unit after being cooled by the reaction product cooler (E-6305).

[0010] The beneficial effects of this utility model are as follows: By adding a heavy component removal tower and an isomerization compressor, the heavy component product at the bottom of the heavy component removal tower after vacuum distillation has a C4 olefin content of less than 4%. The heavy component material at the bottom of the tower is pressurized by the heavy component product external pump, and then cooled by the heavy component product cooler before being sent to the storage and transportation tank area. The purpose of improving the purity of the product at the bottom of the heavy component removal tower is achieved through vacuum distillation and circulating distillation operations. Attached Figure Description

[0011] Figure 1 This is a connection diagram of Embodiment 1 of this utility model; Figure 2 This is a connection diagram of Embodiment 2 of this utility model; In the diagram above: Heavy component removal tower C-6301, fine heavy component removal tower C-6302, bottom reboiler C-6310, bottom reboiler E-6310, air cooler A-6301 for the reaction unit, top condenser E-6307 for the heavy component removal tower, top reflux tank D-6302 for the heavy component removal tower, top reflux pump P-6301 for the heavy component removal tower, product cooler E-6305, external pump for heavy component products P-6302, inlet buffer tank D-6301 for the isomerization compressor, isomerization compressor K-6301, and product cooler E-6302 for heavy component products. Detailed Implementation

[0012] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0013] Example 1, referring to Figure 1 This utility model discloses a device for improving the purity of the bottom product of a C4 vacuum distillation deweighting column, comprising a deweighting column C-6301, a fine deweighting column C-6302, a heavy component product external pump P-6302, an isomerization compressor inlet buffer tank D-6301, an isomerization compressor K-6301, and a heavy component product cooler E-6302. The bottom outlet of the deweighting column C-6301 is connected to the upper inlet of the fine deweighting column C-6302 via a pipeline, and the top outlet of the fine deweighting column C-6302 is connected via a pipeline. The feed is directed to the inlet of the isomerization compressor inlet buffer tank D-6301. The outlet of the isomerization compressor buffer tank D-6301 is connected to the inlet of the isomerization compressor K-6301 via a pipeline. The outlet of the isomerization compressor K-6301 is connected to the upper feed port of the de-heavy component tower C-6301 via a pipeline. The bottom of the de-heavy component tower C-6302 is connected to the heavy component product cooler E-6302 via a pipeline and the heavy component product external pump P-6302. The outlet of the heavy component product cooler E-6302 is connected to the storage and transportation tank area via a pipeline.

[0014] Preferably, the top outlet of the aforementioned de-weighting tower C-6301 is connected to the inlet of the air cooler A-6301 of the reaction unit via a pipeline, the bottom outlet of the air cooler A-6301 of the reaction unit is connected to the top shell inlet of the top condenser E-6307 of the de-weighting tower via a pipeline, and the shell outlet of the top condenser E-6307 of the de-weighting tower is connected to the top reflux tank D-6302 of the de-weighting tower via a pipeline.

[0015] Preferably, the bottom outlet of the above-mentioned top reflux tank D-6302 of the deweighting tower is connected to the inlet of the top reflux pump P-6301 of the deweighting tower via a pipeline, and the outlet of the top reflux pump P-6301 of the deweighting tower is sent to the etherification unit after being cooled by the reaction product cooler E-6305 via a pipeline.

[0016] Preferably, a bottom reboiler E-6310 for the above-mentioned de-weighting tower C-6302 is installed at the bottom.

[0017] Preferably, a bottom reboiler C-6310 is installed at the bottom of the aforementioned deweight removal tower C-6301.

[0018] In use, the gaseous material extracted from the top of the deweight removal tower C-6301 is cooled and condensed by the air cooler A-6301 in the reaction unit, and then sent to the top condenser E-6307 for further cooling and condensation. The reaction product material cooled by the top condenser E-6307 enters the top reflux tank D-6302. The liquid reaction product material in the top reflux tank D-6302 is pressurized by the top reflux pump P-6301, cooled by the reaction product cooler E-6305, and then sent to the etherification unit. Additionally, the gaseous material extracted from the bottom of the deweight removal tower C-6301... The mixture of heavy components and C4 olefins is pressurized and fed into the de-heavy distillation tower C-6302. Within the de-heavy distillation tower C-6302, the heavy components and C4 olefins undergo vacuum distillation to separate the heavy components from the C4 system, recovering the C4 olefins from the heavy components. The vapor phase from the top of the de-heavy distillation tower C-6302 enters the compressor inlet buffer tank D-6301. The vapor phase material in the compressor inlet buffer tank D-6301 is pressurized by the isomerization compressor K-6301 and then sent to the de-heavy distillation tower C-6301 for further distillation and purification to remove C5 and higher components from the recycled C4 material. After vacuum distillation, the C4 olefin content in the bottom heavy component product of the deweighting tower C-6302 is less than 4%. The bottom heavy component material is pressurized by the heavy component product external pump P-6302 and then cooled by the heavy component product cooler E-6302 before being sent to the storage and transportation tank area. The purpose of improving the purity of the bottom product of the deweighting tower is achieved through vacuum distillation and circulating distillation.

[0019] Example 2: The present invention discloses a device for improving the purity of the bottom product of a C4 vacuum distillation deweighting column, comprising a deweighting column C-6301, a fine deweighting column C-6302, a heavy component product external pump P-6302, an isomerization compressor inlet buffer tank D-6301, an isomerization compressor K-6301, and a heavy component product cooler E-6302. The bottom outlet of the deweighting column C-6301 is connected to the upper inlet of the fine deweighting column C-6302 via a pipeline, and the top outlet of the fine deweighting column C-6302 is connected to the bottom outlet via a pipeline. The inlet of the isomerization compressor inlet buffer tank D-6301 is connected to the inlet of the isomerization compressor K-6301 via a pipeline. The outlet of the isomerization compressor K-6301 is connected to the upper feed port of the de-heavy component tower C-6301 via a pipeline. The bottom of the de-heavy component tower C-6302 is connected to the heavy component product cooler E-6302 via a pipeline and the heavy component product external pump P-6302. The outlet of the heavy component product cooler E-6302 is connected to the storage and transportation tank area via a pipeline.

[0020] The difference from Example 1 is: Reference Figure 2 The bottom outlet of the top reflux tank D-6302 of the deweight removal tower mentioned in this utility model is connected to the inlet of the top reflux pump P-6301 of the deweight removal tower via a pipeline. The outlet of the top reflux pump P-6301 of the deweight removal tower is divided into two pipelines. One pipeline is connected to the reflux port on the upper side of the deweight removal tower C-6301, and the other pipeline is sent to the etherification unit after being cooled by the reaction product cooler E-6305.

[0021] The above description is merely a preferred embodiment of this utility model. Any person skilled in the art may modify this utility model or modify it into an equivalent technical solution using the technical solutions described above. Therefore, any simple modifications or equivalent transformations made based on the technical solutions of this utility model are within the scope of protection claimed by this utility model.

Claims

1. A device for improving the purity of the bottom product of a C4 vacuum distillation de-weighting column, comprising a de-weighting column (C-6301), characterized in that: It also includes a heavy component removal tower (C-6302), a heavy component product external pump (P-6302), an isomerization compressor inlet buffer tank (D-6301), an isomerization compressor (K-6301), and a heavy component product cooler (E-6302). The bottom outlet of the heavy component removal tower (C-6301) is connected to the upper inlet of the heavy component removal tower (C-6302) via a pipeline, and the top outlet of the heavy component removal tower (C-6302) is connected to the inlet of the isomerization compressor inlet buffer tank (D-6301) via a pipeline. The outlet of the isomerization compressor buffer tank (D-6301) is connected to the inlet of the isomerization compressor (K-6301) via a pipeline, and the outlet of the isomerization compressor (K-6301) is connected to the upper feed port of the de-weighting tower (C-6301) via a pipeline; the bottom of the fine de-weighting tower (C-6302) is connected to the heavy component product cooler (E-6302) via a pipeline and the heavy component product external pump (P-6302), and the outlet of the heavy component product cooler (E-6302) is connected to the storage and transportation tank area via a pipeline.

2. The device for improving the purity of the bottom product of the C4 vacuum distillation deweighting column according to claim 1, characterized in that: The top outlet of the de-weighting tower (C-6301) is connected to the inlet of the air cooler (A-6301) of the reaction unit via a pipeline. The bottom outlet of the air cooler (A-6301) of the reaction unit is connected to the top shell inlet of the top condenser (E-6307) of the de-weighting tower via a pipeline. The shell outlet of the top condenser (E-6307) of the de-weighting tower is connected to the top reflux tank (D-6302) of the de-weighting tower via a pipeline.

3. The device for improving the purity of the bottom product of the C4 vacuum distillation deweighting column according to claim 2, characterized in that: The bottom outlet of the top reflux tank (D-6302) of the deweight removal tower is connected to the inlet of the top reflux pump (P-6301) of the deweight removal tower via a pipeline. The outlet of the top reflux pump (P-6301) of the deweight removal tower is sent to the etherification unit after being cooled by the reaction product cooler (E-6305) via a pipeline.

4. The device for improving the purity of the bottom product of the C4 vacuum distillation deweighting column according to claim 3, characterized in that: The bottom of the de-weighting tower (C-6302) is equipped with a bottom reboiler (E-6310).

5. The device for improving the purity of the bottom product of the C4 vacuum distillation deweighting column according to claim 4, characterized in that: The bottom of the deweight removal tower (C-6301) is equipped with a bottom reboiler (C-6310).

6. The device for improving the purity of the bottom product of a C4 vacuum distillation deweighting column according to claim 5, characterized in that: The outlet of the top reflux pump (P-6301) of the deweight removal tower is divided into two pipelines. One pipeline is connected to the reflux port on the upper side of the deweight removal tower (C-6301), and the other pipeline is sent to the etherification unit after being cooled by the reaction product cooler (E-6305).

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