Neopentyl glycol wastewater recycling device

Abstract

The utility model discloses a neopentyl glycol wastewater recycling device which comprises a wastewater separation tower, a wastewater tank, a methanol tower and an incinerator, pure water in wastewater generated in the production process of neopentyl glycol is recycled, and the amount of wastewater sent to the incinerator can be reduced, so that the energy consumption is reduced. In addition, the obtained pure water can be used for preparing a methanol aqueous solution for recycling, so that the purpose of saving water can be further achieved.

Description

Technical Field

[0001] The utility model belongs to the field of fine chemical industry, and in particular relates to a neopentyl glycol wastewater recycling device. Background Art

[0002] Neopentyl glycol (NPG), as an additive for coatings and paints, plays an increasingly important role in improving product performance and increasing product value. It is also widely used in the selective separation of aromatics and cycloalkyl hydrocarbons. With the rapid development of environmentally friendly coatings, the demand for NPG continues to increase, and its application is becoming increasingly widespread, showing promising market prospects.

[0003] Currently, the wastewater produced by neopentyl glycol production mainly consists of water, trimethylamine, methanol, and isobutanol. The commonly used method is to send the wastewater to an incinerator for direct incineration. This direct incineration of wastewater has problems such as high energy consumption and high costs. Summary of the Invention

[0004] The purpose of the utility model is to provide a neopentyl glycol wastewater recycling device, which can separate the effective components in the wastewater and recycle them, thereby reducing the discharge of wastewater and avoiding the energy consumption caused by directly incinerating a large amount of wastewater.

[0005] In order to achieve the above objectives, the technical solution of the present utility model is as follows:

[0006] A neopentyl glycol wastewater recycling device is characterized by comprising: a wastewater separation tower, a wastewater tank, a methanol tower, and an incinerator;

[0007] A wastewater separation tower is provided with a liquid inlet on its side wall, a first condenser on its top, a first reboiler and a liquid outlet at its bottom, and a side line extraction pipeline is provided in the middle of the wastewater separation tower;

[0008] A wastewater tank is provided with a wastewater inlet and a wastewater outlet, and the side line production pipeline is connected to the wastewater inlet of the wastewater tank through a side pump and a second condenser;

[0009] The methanol tower has a liquid inlet on its side wall, a third condenser on its top, a second reboiler and a pure water outlet at its bottom; the wastewater outlet of the wastewater tank is connected to the liquid inlet of the methanol tower through a pipeline and a pump;

[0010] Incinerator, the first condenser and the third condenser are connected to the incinerator through pipelines, and the wastewater outlet of the wastewater separation tower is connected to the incinerator through pipelines.

[0011] The wastewater generated during the production of neopentyl glycol enters the wastewater separation tower and is distilled through the first reboiler set at the bottom of the tower. The light components in the wastewater (a small amount of water, isobutanol, methanol, trimethylamine, etc.) are condensed from the first condenser at the top of the tower and then transported to the incinerator for incineration.

[0012] A side-line extraction pipeline located in the middle of the wastewater separation tower extracts a gas mixture containing water and organic matter. This gas mixture is cooled in a second condenser and then enters a wastewater tank. Uncondensed trimethylamine and trace amounts of methanol are discharged from the top of the wastewater tank and transported to an incinerator. The condensed water and methanol remain in the wastewater tank. The methanol-containing water in the wastewater tank is then transported to the methanol tower for distillation in a second reboiler located at the bottom of the methanol tower. The light components (methanol, trimethylamine, and other organic matter) are condensed in a third condenser at the top of the methanol tower and then transported to an incinerator for incineration. The pure water obtained after distillation in the second reboiler is discharged from the pure water outlet at the bottom of the methanol tower. The resulting pure water can be mixed with formaldehyde to form a formaldehyde solution for recycling, thus saving water.

[0013] The remaining heavy components in the wastewater (neopentyl glycol, isobutanol, neopentyl glycol formate, methyl formate, isobutyl formate, etc.) are discharged from the bottom liquid outlet of the tower and transported to the incinerator for incineration.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] The device, which recycles pure water from the wastewater generated during the neopentyl glycol production process, can reduce the amount of wastewater sent to the incinerator, thereby reducing energy consumption. Furthermore, the recovered pure water can be recycled and reused in the preparation of methanol-water solution, further contributing to water conservation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the device of the present utility model. DETAILED DESCRIPTION

[0017] See also Figure 1 A neopentyl glycol wastewater recycling device includes: a wastewater separation tower 1, a wastewater tank 2, a methanol tower 3, an incinerator 10,

[0018] The wastewater separation tower 1 has a liquid inlet on its side wall, a first condenser 4 on its top, a first reboiler 5 and a liquid outlet at its bottom, and a side line extraction pipe 6 in the middle of the wastewater separation tower 1;

[0019] The wastewater tank 2 is provided with a wastewater inlet and a wastewater outlet, and the side line extraction pipeline 6 is connected to the wastewater inlet of the wastewater tank 2 through the second condenser 7;

[0020] The methanol tower 3 has a liquid inlet on its side wall, a third condenser 8 on its top, a second reboiler 9 and a pure water outlet at its bottom; the wastewater outlet of the wastewater tank is connected to the liquid inlet of the methanol tower through a pipeline and a pump 11;

[0021] The incinerator 10, the first condenser 4 and the third condenser 8 are connected to the incinerator through pipelines, and the wastewater outlet of the wastewater separation tower is connected to the incinerator through pipelines.

[0022] In this embodiment, the wastewater generated during the production of neopentyl glycol enters the wastewater separation tower 1 and is distilled by the first reboiler 5 provided at the bottom of the tower. The light components in the wastewater (a small amount of water, isobutanol, methanol, trimethylamine, etc.) are condensed from the first condenser 4 at the top of the tower and then transported to the incinerator 10 for incineration treatment.

[0023] A side-line extraction pipe 6, located in the middle of wastewater separation tower 1, extracts a gas mixture containing water and organic matter. This gas mixture is cooled in a second condenser 7 and then enters wastewater tank 2. Uncondensed trimethylamine and trace amounts of methanol are discharged from the top of the wastewater tank and transported to an incinerator 10. The condensed water and methanol remain in wastewater tank 2. The water and methanol in wastewater tank 2 are then transported to methanol tower 3. After distillation in a second reboiler 9 at the bottom of methanol tower 3, the light components (methanol, trimethylamine, and other organic matter) are condensed in a third condenser 8 at the top of the methanol tower and then transported to incinerator 10 for incineration. The pure water obtained after distillation in the second reboiler 9 is discharged from a pure water outlet at the bottom of the methanol tower. The resulting pure water can be mixed with formaldehyde to form a formaldehyde solution for recycling, thereby saving water.

[0024] The remaining heavy components (neopentyl glycol, isobutanol, neopentyl glycol formate, methyl formate, isobutyl formate, etc.) in the wastewater separation tower are discharged from the bottom liquid outlet of the tower and transported to the incinerator for incineration.

Claims

1. A neopentyl glycol wastewater recycling device, characterized in that: include: Wastewater separation tower, wastewater tank, methanol tower, incinerator; A wastewater separation tower is provided with a liquid inlet on its side wall, a first condenser on its top, a first reboiler and a liquid outlet at its bottom, and a side line extraction pipeline is provided in the middle of the wastewater separation tower; A wastewater tank is provided with a wastewater inlet and a wastewater outlet, and the side line production pipeline is connected to the wastewater inlet of the wastewater tank through a side pump and a second condenser; The methanol tower has a liquid inlet on its side wall, a third condenser on its top, a second reboiler and a pure water outlet at its bottom; the wastewater outlet of the wastewater tank is connected to the liquid inlet of the methanol tower through a pipeline and a pump; The first condenser and the third condenser are connected to the incinerator through pipelines, and the wastewater outlet of the wastewater separation tower is connected to the incinerator through pipelines and pumps.

2. The device according to claim 1, wherein: The wastewater separation tower and the methanol tower are internally provided with structured wire mesh fillers.

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