CN111467826A - Device and method for removing aldehydes of propylene oxide product - Google Patents
Device and method for removing aldehydes of propylene oxide product Download PDFInfo
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- CN111467826A CN111467826A CN202010460275.9A CN202010460275A CN111467826A CN 111467826 A CN111467826 A CN 111467826A CN 202010460275 A CN202010460275 A CN 202010460275A CN 111467826 A CN111467826 A CN 111467826A
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- Prior art keywords
- tower
- storage tank
- propylene oxide
- intermediate storage
- tank
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Links
- GOOHAUXETOMSMM-UHFFFAOYSA-N Propylene oxide Chemical compound CC1CO1 GOOHAUXETOMSMM-UHFFFAOYSA-N 0.000 title claims abstract description 57
- 238000000034 method Methods 0.000 title claims abstract description 15
- 150000001299 aldehydes Chemical class 0.000 title description 33
- 238000012432 intermediate storage Methods 0.000 claims abstract description 40
- 238000010992 reflux Methods 0.000 claims abstract description 26
- 239000007788 liquid Substances 0.000 claims abstract description 19
- 239000013043 chemical agent Substances 0.000 claims abstract description 13
- 229910000033 sodium borohydride Inorganic materials 0.000 claims abstract description 9
- 239000012279 sodium borohydride Substances 0.000 claims abstract description 9
- 238000003860 storage Methods 0.000 claims abstract description 8
- 239000000126 substance Substances 0.000 claims abstract description 6
- 238000012423 maintenance Methods 0.000 claims abstract description 5
- 239000013049 sediment Substances 0.000 claims abstract description 4
- 125000002485 formyl group Chemical class [H]C(*)=O 0.000 claims abstract 14
- 239000000047 product Substances 0.000 claims description 41
- 239000007864 aqueous solution Substances 0.000 claims description 7
- IKHGUXGNUITLKF-UHFFFAOYSA-N Acetaldehyde Chemical compound CC=O IKHGUXGNUITLKF-UHFFFAOYSA-N 0.000 claims description 6
- 238000000605 extraction Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 5
- 239000013067 intermediate product Substances 0.000 claims description 3
- -1 propylene oxide aldehydes Chemical class 0.000 claims description 3
- 238000005457 optimization Methods 0.000 abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract 1
- 229920000570 polyether Polymers 0.000 description 7
- 239000004721 Polyphenylene oxide Substances 0.000 description 6
- 239000002244 precipitate Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000012467 final product Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- NBBJYMSMWIIQGU-UHFFFAOYSA-N Propionic aldehyde Chemical compound CCC=O NBBJYMSMWIIQGU-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- ZTQSAGDEMFDKMZ-UHFFFAOYSA-N butyric aldehyde Natural products CCCC=O ZTQSAGDEMFDKMZ-UHFFFAOYSA-N 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 229920005749 polyurethane resin Polymers 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/14—Fractional distillation or use of a fractionation or rectification column
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/009—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping in combination with chemical reactions
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D301/00—Preparation of oxiranes
- C07D301/32—Separation; Purification
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D303/00—Compounds containing three-membered rings having one oxygen atom as the only ring hetero atom
- C07D303/02—Compounds containing oxirane rings
- C07D303/04—Compounds containing oxirane rings containing only hydrogen and carbon atoms in addition to the ring oxygen atoms
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Epoxy Compounds (AREA)
Abstract
A device and a method for removing aldehydes of propylene oxide products relate to an optimization scheme of an aldehyde removal process. Including rectifying column, reflux drum, intermediate storage tank, chemical agent charge system, lightness component tower, epoxypropane product jar of taking off, rectifying column's top of the tower be connected with the reflux drum, reflux drum exit linkage rectifying column and intermediate storage tank make partly backward flows to the rectifying column of feed liquid in the reflux drum, in another part carries to intermediate storage tank, epoxypropane product jar is connected at the bottom of the tower of rectifying column, intermediate storage tank exit linkage lightness component tower of taking off, chemical agent charge system be connected with intermediate storage tank to remove aldehyde in adding middle storage tank with chemical agent sodium borohydride water solution through chemical agent charge system. The aldehyde removing device is modified, and can effectively avoid the blockage of a tower tray of the rectifying tower on the basis of reducing the content of aldehyde substances in a propylene oxide product. The sediment in the intermediate storage tank can be removed when the vehicle is stopped for maintenance.
Description
Technical Field
The invention relates to an optimization scheme of an aldehyde removal process, in particular to a process optimization scheme for removing aldehyde substances of a propylene oxide product by adopting a chemical agent.
Background
Propylene oxide is the primary raw material for the production of polyethers. In the production process of polyether, if the aldehyde content of the propylene oxide product is too high, the propylene oxide product not only has polymerization inhibition effect on polyether reaction, but also can darken the color of the polyether, generate odor, increase the toxicity of the polyether and reduce the strength of polyurethane resin which is a downstream product of the polyether. With the increasing market competition, the content of aldehydes in propylene oxide products is attracting more and more attention of downstream users of propylene oxide. Therefore, the reduction of the content of aldehyde substances, the improvement of the quality of propylene oxide products and the satisfaction of the demands of downstream high-end polyether users are the primary tasks of propylene oxide manufacturers. The main aldehydes in the propylene oxide product are acetaldehyde and propionaldehyde, and the content of the aldehydes is an important index of the specification of the propylene oxide product. In the prior art, a sodium borohydride aqueous solution is introduced into a propylene oxide rectifying tower to remove aldehyde, and after the operation is carried out for a period of time, the rectifying tower tray is easy to block, and the precipitate needs to be cleaned regularly or stopped to clean, so that the normal production operation is greatly influenced.
Disclosure of Invention
In order to prevent the device shutdown caused by the blockage of a rectifying tower tray in the process of removing aldehyde by sodium borohydride, the invention provides an optimized scheme of an epoxy propane aldehyde removing process. The high-concentration propylene oxide containing aldehyde is introduced into the intermediate storage tank, the aldehyde removal operation is carried out in the intermediate storage tank, and the precipitate generated in the aldehyde removal reaction process is accumulated at the bottom of the intermediate storage tank and is cleaned when the vehicle is stopped for maintenance.
In order to achieve the purpose, the invention adopts the technical scheme that:
a device for removing aldehydes of a propylene oxide product comprises a rectifying tower, a reflux tank, an intermediate storage tank, a dosing device, a light component removal tower and a propylene oxide product tank, wherein the top of the rectifying tower is connected with the reflux tank, an outlet of the reflux tank is connected with the rectifying tower and the intermediate storage tank, so that one part of feed liquid in the reflux tank flows back to the rectifying tower, the other part of the feed liquid is conveyed into the intermediate storage tank, the bottom of the rectifying tower is connected with the propylene oxide product tank, an outlet of the intermediate storage tank is connected with the light component removal tower, the dosing device is connected with the intermediate storage tank, and chemical agents are added into the intermediate storage tank through the dosing device.
A method for removing aldehydes in a propylene oxide product comprises the following steps:
1) introducing the material in the propylene oxide intermediate tank into a rectifying tower;
2) the rectifying tower is normally operated, one part of feed liquid in the tower top reflux tank reflows, the other part of feed liquid is extracted to the intermediate storage tank, and the tower top temperature and the tower top extraction amount can be adjusted according to the aldehyde-containing condition of the product;
3) the liquid in the rectifying tower is extracted to a propylene oxide product tank under the control of liquid level;
4) adding a proper amount of chemical agent sodium borohydride aqueous solution into the intermediate storage tank through a dosing device;
5) the material in the intermediate storage tank is pumped to a crude propylene oxide rectifying tower (a light component removal tower);
6) during the parking maintenance, the sediment at the bottom of the middle storage tank is cleaned.
The invention has the beneficial effects that: in the chemical method aldehyde removal process, the phenomenon that the rectifying tower runs out of control due to blockage of the rectifying tower tray by the precipitate is avoided, and the rectifying tower system needs to be stopped to clean the tower tray or clean the precipitate. In addition, although the amount of the sodium borohydride aqueous solution is small, the quality of the propylene oxide product is greatly influenced by directly using the sodium borohydride aqueous solution in a product rectifying tower. In the scheme, the feed liquid after aldehyde removal returns to the crude propylene oxide rectifying tower or the light component removal tower, so that the propylene oxide can be recovered, and the influence on the quality of a propylene oxide product is avoided.
Description of the drawings:
FIG. 1 is a schematic view of the structure of the apparatus of the present invention:
as shown in the figure: 1. a rectifying tower; 2. a reflux tank; 3. an intermediate storage tank; 4. a dosing device; 5. a light component removal tower (a crude propylene oxide rectifying tower); 6. a propylene oxide product tank.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in the attached figure 1, the device comprises a rectifying tower 1, a reflux tank 2, an intermediate storage tank 3, a dosing device 4, a light component removal tower 5 and a propylene oxide product tank 6, wherein the top of the rectifying tower 1 is connected with the reflux tank 2, the outlet of the reflux tank 2 is connected with the rectifying tower 1 and the intermediate storage tank 3, so that one part of feed liquid in the reflux tank 2 flows back to the rectifying tower 1, the other part of the feed liquid is conveyed into the intermediate storage tank 3, the bottom of the rectifying tower 1 is connected with the propylene oxide product tank 6, the outlet of the intermediate storage tank 3 is connected with the light component removal tower 5, the dosing device 4 is connected with the intermediate storage tank 3, and chemical agents are added into the intermediate storage tank 3 through the dosing device 4. The rectifying tower 1, the reflux tank 2, the intermediate storage tank 3, the dosing device 4, the light component removal tower 5 and the propylene oxide product tank 6 are connected through pipelines. The pipeline connecting the outlet of the reflux tank 2 with the rectifying tower 1 and the middle storage tank 3, the pipeline connecting the middle storage tank 3 with the light component removing tower 5, and the pipeline connecting the outlet at the bottom of the rectifying tower 1 with the propylene oxide product tank 6 are respectively provided with a pump.
The chemical agent is sodium borohydride aqueous solution.
The method for removing aldehydes of the propylene oxide product comprises the following steps:
1. when the total aldehyde content of the intermediate product of the propylene oxide in the propylene oxide intermediate tank is high, the acetaldehyde content is mainly high through analysis and detection;
2. introducing the material in the propylene oxide intermediate tank into a rectifying tower 1;
3. the rectifying tower 1 is normally operated, one part of feed liquid in the tower top reflux tank 2 refluxes, the other part of feed liquid is extracted to the intermediate storage tank 3, and the extraction amount and the tower top temperature can be adjusted according to the aldehyde-containing condition of a product;
4. the liquid in the rectifying tower 1 is extracted to a propylene oxide product tank 6 under the control of the liquid level in the tower kettle;
5. adding a proper amount of sodium borohydride aqueous solution into the intermediate storage tank 3 through a dosing device 4;
6. the material in the intermediate storage tank 3 is pumped to a light component removal tower 5 by a machine;
7. during the parking maintenance, the sediment at the bottom of the middle storage tank 3 is cleaned.
The invention effectively solves the problem of ultrahigh total aldehyde content of the propylene oxide product, has ideal effect, and the content of aldehyde substances in the propylene oxide product is below 20ppm at present.
The invention can control the total aldehyde content in the propylene oxide product by changing the temperature (35-40 ℃) at the top of the rectifying tower 1, the yield at the top of the rectifying tower and the adding amount of the aldehyde removing agent.
Example 1:
the tower top extraction amount is as follows: 60kg/h
The temperature at the top of the tower is controlled as follows: 36.6 deg.C
The total aldehyde content is: 99ppm of
The dosage is as follows: 0.13kg/h
The aldehyde content of the final product was: 11 ppm.
Example 2:
the tower top extraction amount is as follows: 62kg/h
The temperature at the top of the tower is controlled as follows: 36.8 deg.C
The total aldehyde content is: 121ppm of
The dosage is as follows: 0.14kg/h
The aldehyde content of the final product was: 11 ppm.
Example 3:
the tower top extraction amount is as follows: 40kg/h
The temperature at the top of the tower is controlled as follows: 36.8 deg.C
The total aldehyde content is: 99ppm of
The dosage is as follows: 0.13kg/h
The aldehyde content of the final product was: 10 ppm.
The above examples show that the present invention has a desirable effect of removing aldehydes.
Claims (7)
1. A device for removing aldehydes substances of a propylene oxide product is characterized in that: including rectifying column (1), reflux drum (2), intermediate storage tank (3), charge device (4), take off light component tower (5), epoxypropane product jar (6), the top of the tower of rectifying column (1) be connected with reflux drum (2), reflux drum (2) exit linkage rectifying column (1) and intermediate storage tank (3), make partly backward flow of feed liquid in reflux drum (2) to rectifying column (1), another part is carried in intermediate storage tank (3), epoxypropane product jar (6) are connected at the bottom of the tower of rectifying column (1), intermediate storage tank (3) exit linkage take off light component tower (5), charge device (4) be connected with intermediate storage tank (3) to in adding chemical agent to intermediate storage tank (3) through charge device (4).
2. The apparatus for removing aldehydes from propylene oxide products as claimed in claim 1, wherein: the rectifying tower (1), the reflux tank (2), the intermediate storage tank (3), the dosing device (4), the light component removal tower (5) and the propylene oxide product tank (6) are connected through pipelines.
3. The apparatus for removing aldehydes from propylene oxide products as claimed in claim 1, wherein: the pipeline connecting the outlet of the reflux tank (2) with the rectifying tower (1) and the middle storage tank (3), the pipeline connecting the middle storage tank (3) with the light component removal tower (5), and the pipeline connecting the outlet at the bottom of the rectifying tower (1) with the propylene oxide product tank (6) are respectively provided with a pump.
4. A method for removing aldehydes from propylene oxide products by the apparatus of any one of claims 1 to 3, characterized by comprising the steps of:
1) analyzing and detecting the acetaldehyde content when the total aldehyde content of the intermediate product of the propylene oxide in the propylene oxide intermediate tank is high;
2) introducing the intermediate product of the propylene oxide into a rectifying tower (1);
3) the rectifying tower (1) is normally operated, one part of feed liquid in the tower top reflux tank (2) refluxes, the other part of feed liquid is extracted to the intermediate storage tank (3), and the tower top temperature and the tower top extraction amount can be adjusted according to the aldehyde-containing condition of a product;
4) the liquid in the rectifying tower (1) is extracted to a propylene oxide product tank (6) under the control of the liquid level in the tower kettle;
5) adding a proper amount of chemical agent into the intermediate storage tank (3) through a dosing device (4);
6) the material in the intermediate storage tank (3) is pumped to a light component removal tower (5);
7) during the parking maintenance, the sediment at the bottom of the middle storage tank (3) is cleaned.
5. The method for removing aldehydes from propylene oxide products as claimed in claim 4, wherein: the total aldehyde content in the propylene oxide product is adjusted according to the tower top temperature and the tower top output of the rectifying tower (1).
6. The process for removing propylene oxide aldehydes as set forth in claim 4 or 5, wherein: and 5) adding a chemical agent into the intermediate storage tank (3) for removing aldehyde.
7. The process for removing propylene oxide aldehydes as set forth in claim 6, wherein: the chemical agent is sodium borohydride aqueous solution.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010460275.9A CN111467826A (en) | 2020-05-27 | 2020-05-27 | Device and method for removing aldehydes of propylene oxide product |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010460275.9A CN111467826A (en) | 2020-05-27 | 2020-05-27 | Device and method for removing aldehydes of propylene oxide product |
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