CN216890491U

CN216890491U - BYD waste liquid recovery processing system in 1, 4-butanediol technology

Info

Publication number: CN216890491U
Application number: CN202123120883.4U
Authority: CN
Inventors: 刘月; 魏勇; 赵宁; 程震; 张文豪; 马渊红
Original assignee: Hancheng Black Cat Chemical Co ltd; Shaanxi Heimao Coking Co ltd
Current assignee: Hancheng Black Cat Chemical Co ltd; Shaanxi Heimao Coking Co ltd
Priority date: 2021-12-13
Filing date: 2021-12-13
Publication date: 2022-07-05
Anticipated expiration: 2031-12-13

Abstract

The utility model belongs to the technical field of chemical industry, and relates to a BYD waste liquid recovery processing system in a 1, 4-butanediol process, which comprises a waste liquid storage tank, a coarse filtering unit, a fine filtering unit and a rectifying tower, which are sequentially connected, wherein the coarse filtering unit comprises a plate-and-frame filter press, a filtrate tank and a bag filter; the waste liquid storage tank is communicated with the fine filter unit through a plate-and-frame filter press and a filtrate tank in sequence; the fine filtering unit comprises a liquid collecting tank, a primary filter, a secondary filter and a tertiary filter which are sequentially communicated; the bag filter is communicated with the filtrate tank; the third-stage filter is communicated with the rectifying tower. According to the utility model, the BYD waste liquid is filtered and rectified, so that the waste liquid is recycled, and resources are saved; the treatment capacity of the waste liquid is reduced, the treatment effect is good, and the treatment cost is reduced; is easy to be popularized and applied.

Description

BYD waste liquid recovery processing system in 1, 4-butanediol technology

Technical Field

The utility model belongs to the technical field of chemical industry, and relates to a BYD waste liquid recovery treatment system in a 1, 4-butanediol process.

Background

The 1, 4-Butanediol (BDO) process is typically acetylene plus formaldehyde to 1, 4-Butynediol (BYD); then 1, 4-butynediol BYD is hydrogenated to generate crude 1, 4-Butanediol (BDO), and finally the product 1, 4-butanediol is generated by refining. The Envida production process is adopted in our factory, a large amount of BYD waste liquid is generated in the process of adding acetylene and formaldehyde to generate 1, 4-Butynediol (BYD), and the waste liquid mainly contains 1, 4-butynediol BYD, acetylene copper catalyst, formaldehyde and the like.

Because the waste liquid contains harmful substances, the waste liquid needs to be treated so as not to cause harm. However, in our factory, the part of waste liquid is sent to a sewage treatment plant for treatment, but the problems of large waste liquid treatment amount, poor treatment effect and high cost exist; meanwhile, 1, 4-butynediol BYD in the waste liquid is a raw material for the next reaction and has a large content, so that the waste liquid cannot be well utilized in outward delivery treatment, and the resource waste is caused.

SUMMERY OF THE UTILITY MODEL

Aiming at the technical problems in the existing BYD waste liquid treatment, the utility model provides a BYD waste liquid recovery treatment system in a 1, 4-butanediol process, wherein the BYD waste liquid is filtered and rectified to realize the recovery and reutilization of the waste liquid, so that the resource is saved; the treatment capacity of the waste liquid is reduced, the treatment effect is good, and the treatment cost is reduced; is easy to be popularized and applied.

In order to achieve the purpose, the utility model adopts the technical scheme that:

a BYD waste liquid recovery processing system in a 1, 4-butanediol process comprises a waste liquid storage tank, a coarse filtering unit, a fine filtering unit and a rectifying tower which are sequentially communicated.

Further, the coarse filtration unit comprises a plate-and-frame filter press and a filtrate tank; and the waste liquid storage tank is communicated with the fine filter unit through a plate-and-frame filter press and a filtrate tank in sequence.

Further, the fine filtering unit comprises a bag filter, a primary filter and a secondary filter which are communicated in sequence; the bag filter is communicated with the filtrate tank; the secondary filter is communicated with the rectifying tower.

Further, the fine filtering unit also comprises a liquid collecting tank and a pump; the bag filter is communicated with the primary filter through a liquid collecting tank and a pump in sequence.

Furthermore, a first filtering layer and a second filtering layer which are communicated with each other are sequentially arranged in the primary filter from top to bottom; the first filtering layer is an absorbent cotton filtering layer with the filtering precision of 5 microns; the second filtering layer is an absorbent cotton filtering layer with the filtering precision of 0.5 micron.

Furthermore, a filter layer of absorbent cotton with the filtering precision of 1 micron is arranged in the secondary filter.

Further, BYD waste liquid recovery processing system still includes the centrifugal pump of setting between filtrate jar and bag filter and sets up the transfer pump between waste liquid storage tank and plate and frame filter press.

The utility model has the beneficial effects that:

1. according to the BYD liquid waste treatment method, through multi-stage filtration of the coarse filtration unit and the fine filtration unit, impurities and solid catalysts in the BYD liquid waste are filtered, and the BYD liquid waste is rectified and separated to form BYD liquid which is used as a raw material in the next working procedure, so that the BYD liquid waste is recycled, resources are saved, the cost is reduced, and the final treatment capacity of the waste liquid is reduced.

2. In the utility model, after the BYD waste liquid is subjected to multi-stage filtration, the obtained filtered BYD waste material can meet the requirements of rectification on the solution, and refined BYD is obtained by further separation.

Drawings

FIG. 1 is a schematic view of a BYD waste liquid recovery processing system provided by the utility model;

wherein:

1-a waste liquid storage tank; 2-an infusion pump; 3-plate and frame filter press; 4-a filtrate tank; 5, a centrifugal pump; 6-bag filter; 7-liquid collecting tank; 8, a pump; 9-first-stage filter; 10-a secondary filter; 11-rectifying tower.

Detailed Description

The present invention will now be described in detail with reference to the accompanying drawings and examples.

Examples

Referring to fig. 1, the BYD waste liquid recovery processing system in the 1, 4-butanediol process provided by this embodiment includes a waste liquid storage tank 1, a coarse filtration unit, a fine filtration unit, and a rectification tower 5, which are connected in sequence.

The coarse filtration unit provided by the embodiment comprises a plate-and-frame filter press 3 and a filtrate tank 4; the waste liquid storage tank 1 is communicated with the fine filter unit through a plate-and-frame filter press 3 and a filtrate tank 4 in sequence. An infusion pump 2 is arranged between the waste liquid storage tank 1 and the plate-and-frame filter press (3).

The fine filtering unit provided by the embodiment comprises a bag filter 6, a primary filter 9 and a secondary filter 10 which are communicated in sequence; the bag filter 6 is communicated with the filtrate tank 4; the secondary filter 10 is in communication with the rectifying column 11. A centrifugal pump 5 is arranged between the filtrate tank 4 and the bag filter 6.

The fine filtering unit provided by the embodiment further comprises a liquid collecting tank 7 and a pump 8; the bag filter 6 is communicated with a primary filter 9 through a liquid collecting tank 7 and a pump 8 in sequence.

The first filter layer and the second filter layer communicated with each other are sequentially arranged in the primary filter 9 provided by the embodiment from top to bottom; the first filtering layer is an absorbent cotton filtering layer with the filtering precision of 5 microns; the second filtering layer is an absorbent cotton filtering layer with the filtering precision of 0.5 micron. The secondary filter 10 has a filtration accuracy of 1 micron.

The BYD waste liquid recycling method provided by the embodiment comprises the following steps:

1) filtering a coarse BYD waste liquid generated in the BYD process through a coarse filtering unit and a fine filtering unit in sequence, and removing solid particles in the waste liquid to obtain a filtered coarse BYD material liquid;

the step 1) specifically comprises the following steps:

1.1) collecting the crude BYD waste liquid in a waste liquid storage tank 1, conveying the crude BYD waste liquid to a plate-and-frame filter press 3 through a liquid conveying pump 2, and performing filter pressing to obtain crude filtrate and solid catalyst particles; sending the crude filtrate to a filtrate tank 4, and collecting solid catalyst particles as solid waste;

1.2) the coarse filtrate entering the filtrate tank 4 enters a bag filter 6 through a centrifugal pump 5 to be filtered to obtain filtrate and solid waste; the filtrate enters a liquid collecting tank 7, and solid waste is collected;

1.3) sending out filtrate entering a liquid collecting tank 7 by using a pump 8, and sequentially passing through a primary filter 9 and a secondary filter 10 to obtain fine filtrate, namely filtered coarse BYD feed liquid;

2) and mixing the crude BYD material liquid generated by the BYD reactor with the filtered crude BYD material liquid, then feeding the mixture into a rectifying tower 11, and rectifying and separating to obtain the refined BYD material liquid.

Specifically, the raw BYD material liquid is rectified and separated in a rectifying tower 11, impurities such as formaldehyde, methanol and the like in the raw BYD material liquid are removed, a refined BYD material liquid with the formaldehyde content of less than 1% is obtained, and the refined BYD material liquid enters the next working procedure and is used as a raw material to be further reacted to produce the 1, 4-butanediol.

Specifically, the treatment system provided by the utility model is used for recycling BYD waste liquid in production.

BYD waste liquid generated in the BYD production procedure, crude BYD feed liquid produced by a BYD reactor and flushing wastewater, wherein the BYD waste liquid contains 36% of BYD by mass proportion (content), 1-5% of formaldehyde and a solid catalyst of a copper acetylide catalyst.

Collecting BYD waste liquid and flushing waste water in a waste liquid storage tank 1, entering a plate and frame type filter press 3 through a liquid conveying pump 2 for rough filtration, and filtering out solid catalyst particles in the waste liquid to obtain a rough filtrate;

sending the crude filtrate to a filtrate tank 4, filtering the crude filtrate by a bag filter 6 through a centrifugal pump 5, wherein the filtering precision of the bag filter 6 is 10 microns, sending the filtered filtrate into a liquid collecting tank 7, sending the filtrate out by a pump 8, sequentially passing through a first-stage filter 9 and a second-stage filter 10, and filtering the filtrate by three filter layers to obtain a fine filtrate, namely the filtered crude BYD feed liquid;

mixing the filtered crude BYD feed liquid with a crude BYD feed liquid produced by a BYD reactor, and feeding the mixture into a rectifying tower 11 at an operating pressure of 382 Kpa-441 Kpa; the temperature of the tower bottom is 158-168 ℃; under the condition that the pressure difference is less than 32.5Kpa, rectifying and separating to obtain rectifying liquid and rectifying gas; the rectification liquid is refined BYD feed liquid, wherein the content of formaldehyde is less than 1%, and the rectification liquid can be directly used as a raw material for the next production process to continuously produce 1, 4-butanediol; the rectification gas is the separated impurity gases such as formaldehyde, methanol and the like.

The technical indexes of the whole crude BYD waste liquid recovery treatment system are executed according to technical indexes of an Envyda BYD production process, and manual intermittent operation is adopted for operation, so that the system can run safely and stably; after the BYD waste liquid is subjected to multi-stage filtration, the refined BYD is obtained by further separation, and the method is simple in process, easy to implement, low in treatment cost and easy to popularize; meanwhile, the treatment system realizes recycling of the BYD waste liquid, the BYD waste liquid is filtered and rectified to obtain refined BYD, the BYD waste liquid becomes an intermediate raw material for production, raw materials are saved, the final waste liquid treatment capacity is reduced, the treatment effect is good, and the treatment cost is reduced.

Claims

1. The utility model provides a BYD waste liquid recovery processing system in 1, 4-butanediol technology which characterized in that: the BYD waste liquid recovery and treatment system comprises a waste liquid storage tank (1), a coarse filtering unit, a fine filtering unit and a rectifying tower (11) which are sequentially communicated.

2. The BYD waste liquid recovery and treatment system in the 1, 4-butanediol process according to claim 1, is characterized in that: the coarse filtration unit comprises a plate-and-frame filter press (3) and a filtrate tank (4); the waste liquid storage tank (1) is communicated with the fine filter unit through a plate-and-frame filter press (3) and a filtrate tank (4) in sequence.

3. The BYD waste liquid recovery processing system in 1, 4-butanediol technology of claim 2, characterized in that: the fine filtering unit comprises a bag filter (6), a primary filter (9) and a secondary filter (10) which are communicated in sequence; the bag filter (6) is communicated with the filtrate tank (4); the secondary filter (10) is communicated with the rectifying tower (11).

4. The BYD waste liquid recovery processing system in 1, 4-butanediol technology of claim 3, characterized in that: the fine filtering unit also comprises a liquid collecting tank (7) and a pump (8); the bag filter (6) is communicated with the first-stage filter (9) through a liquid collecting tank (7) and a pump (8) in sequence.

5. The BYD waste liquid recovery processing system in 1, 4-butanediol technology of claim 4, characterized in that: a first filtering layer and a second filtering layer which are communicated with each other are sequentially arranged in the primary filter (9) from top to bottom; the first filtering layer is an absorbent cotton filtering layer with the filtering precision of 5 micrometers; the second filtering layer is an absorbent cotton filtering layer with the filtering precision of 0.5 micron.

6. The BYD waste liquid recovery processing system in 1, 4-butanediol technology of claim 5, characterized in that: and a cotton wool filtering layer with the filtering precision of 1 micron is arranged in the secondary filter (10).

7. The BYD waste liquid recovery processing system in 1, 4-butanediol process according to any one of claims 3-6, characterized in that: the BYD waste liquid recovery processing system further comprises a centrifugal pump (5) arranged between the filtrate tank (4) and the bag filter (6) and an infusion pump (2) arranged between the waste liquid storage tank (1) and the plate-and-frame filter press (3).